|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Detecting soil salinity with arid fraction integrated index and salinity index in feature space using Landsat TM imagery显示文摘Modeling soil salinity in an arid salt-affected ecosystem is a difficult task when using remote sensing data because of the complicated soil context(vegetation cover,moisture,surface roughness,and organic matter)and the weak spectral features of salinized soil.Therefore,an index such as the salinity index(SI)that only uses soil spectra may not detect soil salinity effectively and quantitatively.The use of vegetation reflectance as an indirect indicator can avoid limitations associated with the direct use of soil reflectance.The normalized difference vegetation index(NDVI),as the most common vegetation index,was found to be responsive to salinity but may not be available for retrieving sparse vegetation due to its sensitivity to background soil in arid areas.Therefore,the arid fraction integrated index(AFII)was created as supported by the spectral mixture analysis(SMA),which is more appropriate for analyzing variations in vegetation cover(particularly halophytes)than NDVI in the study area.Using soil and vegetation separately for detecting salinity perhaps is not feasible.Then,we developed a new and operational model,the soil salinity detecting model(SDM)that combines AFII and SI to quantitatively estimate the salt content in the surface soil.SDMs,including SDM1 and SDM2,were constructed through analyzing the spatial characteristics of soils with different salinization degree by integrating AFII and SI using a scatterplot.The SDMs were then compared to the combined spectral response index(COSRI)from field measurements with respect to the soil salt content.The results indicate that the SDM values are highly correlated with soil salinity,in contrast to the performance of COSRI.Strong exponential relationships were observed between soil salinity and SDMs(R2>0.86,RMSE<6.86)compared to COSRI(R2=0.71,RMSE=16.21).These results suggest that the feature space related to biophysical properties combined with AFII and SI can effectively provide information on soil salinity. | Fei WANG Xi CHEN GePing LUO JianLi DING XianFeng CHEN | 2013 | Journal of Arid Land2013，5，3： | 14 |
| 2 | Temporal and spatial variability response of groundwater level to land use/land cover change in oases of arid areas显示文摘这份报纸由使用地理信息系统(GIS ) 在 Sangong 河分水岭在干旱绿洲在地下水水平的时间、空间的可变性上在陆地使用 / 盖住变化(LUCC ) 的影响上进行案例研究,遥感(RS ) 和 geostatistical 方法。在在 1978, 1987 和 1998 的分水岭的地下水水平的时间、空间的可变性是由使用 semivariogram 模型和 Kriging 插值的 regressed。在 1978 从天线图象导出的 LUCC 分类地图,在 1987 的 Landsat TM 图象和在 1998 的 Landsat ETM 图象被用来迭加并且与地下水深度的不同等值线图在这些区域分析 LUCC 类型的变换关系。结果证明地下水的变化再装不在整个绿洲是那么重要的,但是时间、空间的 LUCC 在从 1978 ~ 1998 的 20 年的时期期间在正常流动时期或在高流动时期是重要的,并且在他们之间有靠近的关联。通常有地下水水平(33.4%) 的中等空间关联,并且空间自相关距离是 17.78 km。地下水水平严厉地被改变的区域也是陆地资源逐渐地被利用的区域,它主要包括农田,树林,和大楼的利用,工业并且采矿陆地。学习表明 LUCC 强烈在干旱绿洲影响地下水水平的时间、空间的可变性。学习结果具有为讲道理地利用浅地下水资源并且维持干旱绿洲的稳定性的直接、实际的意义。 | YAN Jinfeng CHEN Xi LUO Geping GUO Quanjun | 2006 | Chinese Science Bulletin2006，51，A01： | 12 |
| 3 | Soil properties related to land-use systems in oases of Sangong river watershed, Xinjiang显示文摘在土壤环境上理解人的活动的效果对理解全球变化和持续开发基本。在到农田的热带雨林和半干旱的草地的转变的过程,打 | LUO Geping, CHEN Xi XU Wenqiang | 2008 | Journal of Geographical Sciences2008，18，4： | 10 |
| 4 | Effects of grazing on net primary productivity,evapotranspiration and water use efficiency in the grasslands of Xinjiang,China显示文摘Grazing is a main human activity in the grasslands of Xinjiang, China. It is vital to identify the effects of grazing on the sustainable utilization of local grasslands. However, the effects of grazing on net primary productivity(NPP), evapotranspiration(ET) and water use efficiency(WUE) in this region remain unclear. Using the spatial Biome-BGC grazing model, we explored the effects of grazing on NPP, ET and WUE across the different regions and grassland types in Xinjiang during 1979–2012. NPP, ET and WUE under the grazed scenario were generally lower than those under the ungrazed scenario, and the differences showed increasing trends over time. The decreases in NPP, ET and WUE varied significantly among the regions and grassland types. NPP decreased as follows: among the regions, Northern Xinjiang(16.60 g C/(m^2·a)), Tianshan Mountains(15.94 g C/(m^2·a)) and Southern Xinjiang(-3.54 g C/(m^2·a)); and among the grassland types, typical grasslands(25.70 g C/(m^2·a)), swamp meadows(25.26 g C/(m^2·a)), mid-mountain meadows(23.39 g C/(m^2·a)), alpine meadows(6.33 g C/(m^2·a)), desert grasslands(5.82 g C/(m^2·a)) and saline meadows(2.90 g C/(m^2·a)). ET decreased as follows: among the regions, Tianshan Mountains(28.95 mm/a), Northern Xinjiang(8.11 mm/a) and Southern Xinjiang(7.57 mm/a); and among the grassland types, mid-mountain meadows(29.30 mm/a), swamp meadows(25.07 mm/a), typical grasslands(24.56 mm/a), alpine meadows(20.69 mm/a), desert grasslands(11.06 mm/a) and saline meadows(3.44 mm/a). WUE decreased as follows: among the regions, Northern Xinjiang(0.053 g C/kg H_2O), Tianshan Mountains(0.034 g C/kg H_2O) and Southern Xinjiang(0.012 g C/kg H_2O); and among the grassland types, typical grasslands(0.0609 g C/kg H_2O), swamp meadows(0.0548 g C/kg H_2O), mid-mountain meadows(0.0501 g C/kg H_2O), desert grasslands(0.0172 g C/kg H_2O), alpine meadows(0.0121 g C/kg H_2O) and saline meadows(0.0067 g C/kg H_2O). In general, the decreases in NPP and WUE were more significant in the regions with relatively high levels of vegetation growth because of the high grazing intensity in these regions. The decreases in ET were significant in mountainous areas due to the terrain and high grazing intensity. | HUANG Xiaotao LUO Geping YE Feipeng HAN Qifei | 2018 | Journal of Arid Land2018，10，4： | 9 |
| 5 | A spatial-explicit dynamic vegetation model that couples carbon,water,and nitrogen processes for arid and semiarid ecosystems显示文摘Arid and semiarid ecosystems,or dryland,are important to global biogeochemical cycles.Dryland's community structure and vegetation dynamics as well as biogeochemical cycles are sensitive to changes in climate and atmospheric composition.Vegetation dynamic models has been applied in global change studies,but the complex interactions among the carbon(C),water,and nitrogen(N) cycles have not been adequately addressed in the current models.In this study,a process-based vegetation dynamic model was developed to study the responses of dryland ecosystems to environmental changes,emphasizing on the interactions among the C,water,and N processes.To address the interactions between the C and water processes,it not only considers the effects of annual precipitation on vegetation distribution and soil moisture on organic matter(SOM) decomposition,but also explicitly models root competition for water and the water compensation processes.To address the interactions between C and N processes,it models the soil inorganic mater processes,such as N mineralization/immobilization,denitrification/nitrification,and N leaching,as well as the root competition for soil N.The model was parameterized for major plant functional types and evaluated against field observations. | Chi ZHANG ChaoFan LI Xi CHEN GePing LUO LongHui LI XiaoYu LI Yan YAN Hua SHAO | 2013 | Journal of Arid Land2013，5，1： | 8 |
| 6 | Processes and trends of the land use change in Aksu watershed in the central Asia from 1960 to 2008显示文摘Land use change (LUC) in trans-boundary watersheds is of great importance to environmental assessment. The Aksu River is the largest trans-boundary river crossing Kyrgyzstan and China,but there was little information on the LUC of the watershed. We quantitatively investigated the processes and trends of its LUC by using analytic models based on the land use data derived from the remote sensing images and topographic maps. The LUC was in the quasi-balanced status with a slight difference between the loss and the gain of the area for most land use types during the period of 1960-1990,whereas transferred to the unbalanced status with significant difference between the loss and gain of the area during the period of 1990-2008. At the same time,land conversion direction changed from two-way transition to one-way transition for the most land use types. The integrated rate of net change of land use during the period of 1990-2008 is 2.1 times of that during the period of 1960-1990. Information on the processes and trends of LUC is valuable for better understanding the environmental changes across the whole trans-boundary watershed,and helpful to decision-making management for Kyrgyzstan and China. | Zhou, DeCheng Luo, GePing Lu, Lei | 2010 | Journal of Arid Land2010，2，3： | 7 |
| 7 | A spatial geostatistical analysis of impact of land use development on groundwater resources in the Sangong Oasis Region using remote sensing imagery and data显示文摘In this study, the relationship between land use and cover change (LUCC) and variation of groundwater level and quality in the Sangong Oasis Region was investigated using a spatial geostatistical approach. Specifically, interactions among groundwater, surface water, and LUCC were analyzed through the utilization of geographical information system (GIS), remote sensing (RS) Imagery processing, and geostatistics. Study outputs indicated that recharging into the ground-water did not change significantly during the period from 1978 to 1998. However, both LUCC and groundwater level changed substantially in the Sangong Oasis Region, and their variations were closely correlated to each other spatially and temporally over the past two decades. It confirmed that urbanization process and increased industrial activities were the direct reasons of groundwater table descending and the deterioration of water quality. The results of this research provided a scientific basis for understanding sustainability-related problems and solution options in the oasis areas of western China. | Chen, Xi Yan, JinFeng Chen, Zhi Luo, GePing Song, Qing Xu, WenQiang | 2009 | Journal of Arid Land2009，1，1： | 6 |
| 8 | Sustainable land-use patterns for arid lands: A case study in the northern slope areas of the Tianshan Mountains显示文摘Sustainable land use patterns are ecological and economic prerequisites of regional sustainable development. This is especially true for arid lands, where the environment is wholly fragile thanks to extremely limited precipitation, and where human activities have greatly transformed natural desert system by clearing natural vegetation, expanding oases and even building dams on inland rivers. However, the current studies on land use patterns are still characterized by field investigations and case studies, with almost no solid scientific basis. This paper holds that land types and their combination patterns are the principal basis for designing sustainable land use patterns, and that GIS and RS-based large-scale land type mapping and the study of their spatial combination structures should be coordinated with the demand of social development. The existing environmental problems induced by irrational land use mostly result from their deviation from the natural properties of land types. Taking the northern slope of the Tianshan Mountains (NSTM) as an example and considering land type patterns as the basis of land use patterns, this paper improves the vertical oasis-and-mid-mountain two-belts development model and the sustainable mountain land use model for arid lands put forward in recent years; and in terms of oases patterns, it outlines oasis development models, including intensive land use pattern in alluvial-diluvial fans, moderate agricultural development pattern in alluvial plains, and ecological land use pattern in river-end oases. | LUO Geping FENG Yixing ZHANG Baiping CHENG Weiming | 2010 | Journal of Geographical Sciences2010，20，4： | 6 |
| 9 | Modeling grassland net primary productivity and water-use efficiency along an elevational gradient of the Northern Tianshan Mountains显示文摘Mountainous ecosystems are considered highly sensitive and vulnerable to natural disasters and climatic changes.Therefore,quantifying the effects of elevation on grassland productivity to understand ecosystem-climate interactions is vital for mountainous ecosystems.Water-use efficiency(WUE)provides a useful index for understanding the metabolism of terrestrial ecosystems as well as for evaluating the degradation of grasslands.This paper explored net primary productivity(NPP)and WUE in grasslands along an elevational gradient ranging from 400 to 3,400 m asl in the northern Tianshan Mountains-southern Junggar Basin(TMJB),Xinjiang of China,using the Biome-BGC model.The results showed that:1)the NPP increased by 0.05 g C/(m2·a)with every increase of 1-m elevation,reached the maximum at the mid-high elevation(1,600 m asl),and then decreased by 0.06 g C/(m2·a)per 1-m increase in elevation;2)the grassland NPP was positively correlated with temperature in alpine meadow(AM,2,700-3,500 m asl),mid-mountain forest meadow(MMFM,1,650-2,700 m asl)and low-mountain dry grassland(LMDG,650-1,650 m asl),while positive correlations were found between NPP and annual precipitation in plain desert grassland(PDG,lower than 650 m asl);3)an increase(from 0.08 to 1.09 g C/(m2·a))in mean NPP for the grassland in TMJB under a real climate change scenario was observed from 1959 to 2009;and 4)remarkable differences in WUE were found among different elevations.In general,WUE increased with decreasing elevation,because water availability is lower at lower elevations;however,at elevations lower than 540 m asl,we did observe a decreasing trend of WUE with decreasing elevation,which may be due to the sharp changes in canopy cover over this gradient.Our research suggests that the NPP simulated by Biome-BGC is consistent with field data,and the modeling provides an opportunity to further evaluate interactions between environmental factors and ecosystem productivity. | QiFei HAN GePing LUO ChaoFan LI Hui YE YaoLiang CHEN | 2013 | Journal of Arid Land2013，5，3： | 5 |
| 10 | An analysis of oasis evolution based on land use and land cover change: A case study in the Sangong River Basin on the northern slope of the Tianshan Mountains显示文摘自从1950年代,调查绿洲进化和外设的变化由重建七张陆地盖子地图在 Sangong 河盆抛弃的这研究源于黑白天线相片( 1958 , 1968 ,和 1978 ),一张颜色红外线的天线相片( 1987 ), Landsat 题目的 Mapper ( TM )形象( 1998 ),卫星倒 lObservation de la Terre (点)形象( 2004 ),和 Landsat 运作的陆地成像器( OLI )形象( 2014 )。结果显示出那:(1 ) 自从 1950,绿洲连续地从一把冲积扇子膨胀了超过四次到一个冲积平原,引起荒芜的风景的收缩那被一个 Haloxylon ammodendron Bunge 社区(HBC ) 和一个 Tamarix chinensis 愁相社区(TLC ) 统治。而且,主要(1958-1968 ) 并且期末考试(2004-2014 ) 舞台是最重要的时期在哪个农业土地在时期 1958-1968 期间经历了最快速的扩大期间,并且布满建筑物区域在 2000 年代以后显示出最快速的扩大。(2 ) 二个基本管理模式,本地政府形成的一个本地模式和一个农场管理模式由 Xinjiang 生产和构造军团发展了,一起在各种各样的陆地使用和 landcover (LULC ) 下面的支持的绿洲进化上演。(3 ) 现代绿洲的进化在 1950s-2004 期间显示出干旱绿洲的一般特征,当在 2004-2014 的时期期间它被大规模内部盆的水消遣或新水来源的进口描绘时。(4 ) 绿洲在损坏荒芜的植被的情况下膨胀了,导致在荒芜的植物社区的结构的不同变化,它将使保护荒芜的生态系统更困难。 | ZHANG Qi LUO Geping LI Longhui ZHANG Miao LV Nana WANG Xinxin | 2017 | Journal of Geographical Sciences2017，27，2： | 4 |
| 11 | Response of soil nutrients to different cropping systems in the oasis of arid land显示文摘在到农田的回归线雨林和 semi-aridgrassland 的转变的过程,土壤降级通常发生。但是到绿洲的干旱沙漠的转变是可能的不同于回归线雨林和半干旱的草地的。作为一个学习案例拿冲积平凡绿洲,绿洲土壤性质在不同收割系统的转变的过程期间被调查了并且评估。选择收割系统由盐的忍耐组成庄稼(STC ) ,食物庄稼(FC ) ,甜瓜和蔬菜(MV ) , Economicplants 棉花(EP-C ) ,经济植物葡萄(EP-G ) ,经济植物 -- 跳跃(EP-H ) 。表面土壤(0-20cm ) 样品在 1982, 1999 和 2003 被收集。土壤,有机物(OM ) ,和可得到的 N (一) ,可得到的 P (AP ) 和可得到的 K (AK ) 为每件土壤样品被决定。社会科学统计套装软体统计软件被用来分析土壤性质数据。在 theSangong 河分水岭收割系统的转变被政策,法律和市场直接影响。土壤 OM 内容在 1982 期间经历了衰落 - 1999,然后上升在 1999-2003 期间。一, AP 和 AK 内容与栽培时间显著地增加了。土壤 OM 趋于在变换 fromSTC 和 FC 期间减少到棉花,但是从棉花在变换期间增加到葡萄。土壤 OMwas 与耕作时间逐渐地增加了因此绿洲土壤介绍了碳水池,它显示人的活动为绿洲生态系统的改进合理、有利。 | XU Wenqiang LUO Geping CHEN Xi | 2006 | Chinese Science Bulletin2006，51，A01： | 4 |
| 12 | Mapping of Regional Soil Salinities in Xinjiang and Strategies for Amelioration and Management显示文摘Information on the spatial distribution of soil salinity can be used as guidance in avoiding the continued degradation of land and water resources by better informing policy makers. However, most regional soil-salinity maps are produced through a conventional direct-linking method derived from historic observations. Such maps lack spatial details and are limited in describing the evolution of soil salinization in particular instances. To overcome these limitations, we employed a method that included an integrative hierarchical-sampling strategy(IHSS) and the Soil Land Inference Model(So LIM) to map soil salinity over a regional area. A fuzzy c-means(FCM) classifier is performed to generate three measures, comprising representative grade, representative area, and representative level(membership). IHSS employs these three measures to ascertain how many representative samples are appropriate. Through this synergetic assessment, representative samples are obtained and their soil-salinity values are measured. These samples are input to So LIM, which is constructed based on fuzzy logic, to calculate the soil-forming environmental similarities between representative samples and other locations. Finally, a detailed soil-salinity map is produced through an averaging function that is linearly weighted, which is used to integrate the soil salinity value and soil similarity. This case study, in the Uyghur Autonomous Region of Xinjiang of China, demonstrates that the employed method can produce soil salinity map at a higher level of spatial detail and accuracy. Twenty-three representative points are determined. The results show that 1) the prediction is appropriate in Kuqa Oasis(R2 = 0.70, RPD = 1.55, RMSE = 12.86) and Keriya Oasis(R2 = 0.75, RPD = 1.66, RMSE = 10.92), that in Fubei Oasis(R2 = 0.77, RPD = 2.01, RMSE = 6.32) perform little better than in those two oases, according to the evaluation criterion. 2) Based on all validation samples from three oases, accuracy estimation show the employed method(R2 = 0.74, RPD = 1.67, RMSE = 11.18) performed better than the multiple linear regression model(R2 = 0.60, RPD = 1.47, RMSE = 14.45). 3) The statistical result show that approximately half(48.07%) of the study area has changed to salt-affected soil, mainly distributed in downstream of oases, around lakes, on both sides of rivers and more serious in the southern than the northern Xinjiang. To deal with this issue, a couple of strategies involving soil-salinity monitoring, water management, and plant diversification are proposed, to reduce soil salinization. Finally, this study concludes that the employed method can serve as an alternative model for soil-salinity mapping on a large scale. | WANG Fei CHEN Xi LUO Geping HAN Qifei | 2015 | Chinese Geographical Science2015，25，3： | 4 |
| 13 | Stability of patches of oasis landscape in arid areas:A case study of Sangong River Watershed,Xinjiang,China显示文摘绿洲的稳定性是在进化的过程和在干旱区域的绿洲的管理的关键科学问题之一。绿洲和它的表示的稳定性在不同规模也是不同的。这篇论文在 Tianshan 山的 Sangong 河分水岭与案例研究在风景补丁规模处理绿洲的稳定性。我们采用了 ther 激动地表达感情到进程 ther 的察觉到的、地理信息系统和数学统计方法激动地表达感情在 1978, 1987 和 1998 察觉到三个时期的图象,并且为在风景补丁规模代表绿洲稳定性提出途径。绿洲补丁的风景控制能力是动态风景变化的一种自然驱动力。在有它在它和另外的补丁之间的区域和形状复杂性和对比的风景变化增加以后的某个补丁类型的控制能力,和有它在它和另外的补丁之间的空间距离的还原剂。有最强壮的控制能力的补丁类型应该是风景的矩阵。绿洲风景补丁的变换源于自然、人为的驱动力,特别地人为的驱动力。变换比例越高,越多降低补丁类型的稳定性并且人为的骚乱越更强壮。有在在 1987 的 Sangong 河分水岭的最强壮的网控制能力的补丁类型是荒芜的草地,它是风景的矩阵;但是风景的矩阵在 1987 和 1998 被变成了灌溉陆地。绿洲风景进化上的风景补丁的控制能力逐渐地在程度也逐渐地减少了的 Sangong 河分水岭,和变化与时间减少了。这表明在风景补丁类型之中的相互作用通常通常趋于到还原剂,和绿洲风景补丁的自然稳定性趋于增加。然而,在风景补丁之中的变换由于集中的人的活动的增加更经常发生,它可能在绿洲风景引起环境资源补丁的更低的稳定性和介绍补丁的更高的稳定性。 | LUO Geping ZHOU Chenghu CHEN Xi | 2006 | Chinese Science Bulletin2006，51，A01： | 3 |
| 14 | Can soil respiration estimate neglect the contribution of abiotic exchange?显示文摘This study examines the hypothesis that soil respiration can always be interpreted purely in terms of biotic processes, neglecting the contribution of abiotic exchange to CO2 fluxes in alkaline soils of arid areas that characterize 5% of the Earth's total land surface. Analyses on flux data collected from previous studies suggested reconciling soil respiration as organic(root/microbial respiration) and inorganic(abiotic CO2 exchange) respiration, whose contributions in the total CO2 flux were determined by soil alkaline content. On the basis of utilizing meteorological and soil data collected from the Xinjiang and Central Asia Scientific Data Sharing Platform, an incorporated model indicated that inorganic respiration represents almost half of the total CO2 flux. Neglecting the abiotic module may result in overestimates of soil respiration in arid alkaline lands, which partly explains the long-sought 'missing carbon sink'. | Xi CHEN WenFeng WANG GePing LUO Hui YE | 2014 | Journal of Arid Land2014，6，2： | 3 |
| 15 | Modeling the contribution of abiotic exchange to CO_2 flux in alkaline soils of arid areas显示文摘Recent studies on alkaline soils of arid areas suggest a possible contribution of abiotic exchange to soil CO2 flux(Fc).However,both the overall contribution of abiotic CO2 exchange and its drivers remain unknown.Here we analyzed the environmental variables suggested as possible drivers by previous studies and constructed a function of these variables to model the contribution of abiotic exchange to Fc in alkaline soils of arid areas.An automated flux system was employed to measure Fc in the Manas River Basin of Xinjiang Uygur autonomous region,China.Soil pH,soil temperature at 0–5 cm(Ts),soil volumetric water content at 0–5 cm(θs)and air temperature at10 cm above the soil surface(Tas)were simultaneously analyzed.Results highlight reduced sensitivity of Fc to Ts and good prediction of Fc by the model Fc=R10Q10(Tas–10)/10+r7q7(pH–7)+λTas+μθs+e which represents Fc as a sum of biotic and abiotic components.This presents an approximate method to quantify the contribution of soil abiotic CO2 exchange to Fc in alkaline soils of arid areas. | WenFeng WANG Xi CHEN GePing LUO LongHui LI | 2014 | Journal of Arid Land2014，6，1： | 2 |
| 16 | The relationship between soil,climate and forest development in the mid-mountain zone of the Sangong River watershed in the northern Tianshan Mountains,China显示文摘The mountainous forests in arid regions, being sensitive to climate change, are one of the key research topics related to the mechanism of interaction between climate and the terrestrial ecosystem. In this study, the spatial distribution of a mid-mountain forest and its environmental factors were investigated by using a combination of remote sensing technology, field survey, climate indices and soil nutrient analysis in the Sangong River watershed of the northern Tianshan Mountains. The forest(Picea schrenkiana) was distributed between 1,510 and 2,720 m asl. Tree height and diameter at breast height(DBH) exhibited a bi-modal pattern with increasing elevation, and rested at 2,450 and 2,250 m asl, respectively. The two maxima of DBH appeared at 2,000 and 2,550 m asl, and the taller trees were observed at 2,100 and 2,600 m asl. For the annual mean temperature, the difference was approximately 5.8°C between the lowest and the highest limits of the forest, and the average decreasing rates per hundred meters were 0.49°C and 0.55°C with increasing altitude between 1,500 and 2,000 m asl and above 2,000 m asl, respectively. The annual precipitation in the forest zone first increased and then decreased with the increase of altitude, and the maximum value was at 2,000 m asl. For per hundred meters, the annual precipitation increased with the rate of 31 mm between 1,500 and 2,000 m asl and decreased by 7.8 mm above 2,000 m asl. The SOM, TN and TP were high between 2,000 and 2,700 m asl and low at the lower and upper forest limits. The minimum Ca CO3 concentration, p H value and EC coincided with the maximum precipitation belt at 2,000 m asl. The SOM, TN and TP were high in the topsoil(0–10 cm) and differed significantly from the values observed in the deep soil layers(>10 cm). The soil nutrients exhibited spatial heterogeneity and higher aggregation in the topsoil. In conclusion, soil and climate are closely related to each other, working synergistically to determine the development and spatial distribution of the mid-mountain forest in the study area. The order of the importance of environmental factors to forest development in this study is as follows: soil nutrients>precipitation>elevation>temperature. | Li DAI YiXing FENG GePing LUO YanZhong LI WenQiang XU | 2015 | Journal of Arid Land2015，7，1： | 2 |
| 17 | An analysis of oasis stability in arid areas:a case study in the northern slope areas of the Tianshan Mountains显示文摘This paper discusses oasis stability at regional scale with a case study in the northern slope areas of the Tianshan Mountains (NSTM). The results showed certain significant aspects. (1) As long as water resources in the oasis keep stable and their utilization efficiency can be maintained or gradually increased, the primary productivity could be continuously increased and the natural primary productivity keeped relatively stable. In this case, it is considered that the oasis is stable and its sustainable development can be achieved at regional scale. (2) Considering the availability of water resources in the oases, the oases on the alluvial-diluvial fans are highly stable. In the alluvial plain downstream of the groundwater overflowing zones the oases are moderately stable and in the lacustrine deltas or dry lacustrine deltas the oases are lowly stable. (3) Enlargement of oases and the increase of water resources and vegetation coverage in the oasis will certainly enhance the 'cold-island effect' of the oasis and increase the stability of oases. | Luo, GePing Lu, Lei Yin, ChangYing Feng, YiXing | 2009 | Journal of Arid Land2009，1，1： | 2 |
| 18 | Oasis System and Its Reasonable Development in Sangong River Watershed in North of the Tianshan Mountains,Xinjiang,China显示文摘Under the guide of system theory, taking the oasis in the Sangong River watershed as a case study, this paper analyzes the oasis structure and function from 4 aspects including oasis spatial structure, water resources structure, vegetation structure, economic structure and their corresponding functions. The results indicate that as a typical small-scale watershed, Sangong River watershed has the relatively complete mountain-basin structure, and ecological and productive function. Because of human drastic activity the utilization rate of water resources was as high as 98.7%, and the utilization of groundwater was not reasonable, which resulted in an average annual decline of 0.353m in the water table of alluvial-diluvial-fan oasis, and an average annual increase of 0.047m in the alluvial-plain. The layout of crop and shelter forest benefits to the utilization of water and land resources. The development of oasis economy is at low level, and its eco-economic function is weak. | LEI Jun LUO Geping ZHANG Xiaolei LU Qi | 2006 | Chinese Geographical Science2006，16，3： | 2 |
| 19 | Using the CENTURY model to assess the impact of land reclamation and management practices in oasis agriculture on the dynamics of soil organic carbon in the arid region of North-western China显示文摘 | Wenqiang Xu Xi Chen Geping Luo Qing Lin | 2010 | Ecological Complexity2010，，1： | 1 |
| 20 | Gombmmg syste dynamic model and CLUE - S model to improve land use scenario analyses at regional scale: A case study of Sangong wat1 shed in Xinjiang显示文摘 | Geping Luo Changying Yin Xi Chen et at | 2010 | China Ecological Complexity2010，7，2： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员