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| 1 | Heavy Metals, Phosphorus and Some Other Elements in Urban Soils of Hangzhou City, China显示文摘Health implications of inhaling and/or ingesting dust particles with high concentrations of heavy metals from urban soils are a subject of intense concern. Understanding the geochemistry of these metals is key to their effective management. Total concentrations of heavy metals,phosphorus (P) and 8 other elements from topsoil samples collected at 82 locations in Hangzhou City were measured to:a) assess their distribution in urban environments; and b) understand their differentiation as related to land use. Metal mobility was also studied using a three-step sequential chemical fractionation procedure. About 8.5%,1.2%,3.6%,11.0% and 30.3% of the soil samples had Cd,Cr,Cu,Pb,and Zn concentrations,respectively,above their allowable limits for public and private green areas and residential use. However,in commercial and industrial areas,most samples had metal concentrations below their allowable limits. Statistical analyses revealed that the 16 measured elements in urban soils could be divided into four groups based on natural or anthropic sources using a hierarchical cluster analysis. Additionally,Cu,Pb,and P showed similar spatial distributions with significant pollution in commercial zones,suggesting vehicle traffic or commercial activities as dominant pollutant sources. Also,Cd,Co,Cr,Ni,Zn,Mn and Fe had the highest concentrations in industrial locations,signifying that industrial activities were the main sources of these seven metals. Moreover,the data highlighted land-use as a major influence on heavy metal concentrations and forms found in topsoils with large proportions of soil Cd,Co,Cr,and Ni found in residual fractions and soil Cu,Pb and Zn mainly as extractable fractions. | ZHANGMing-Kui KEZi-Xia | 2004 | Pedosphere2004，14，2： | 93 |
| 2 | 叶面喷施锌肥对不同镉水平下水稻产量及元素含量的影响显示文摘采用外源添加不同浓度镉的盆栽试验,研究在生育后期叶面喷施锌肥对水稻生长、产量以及不同部位锌(Zn)、镉(Cd)、铜(Cu)、铁(Fe)、锰(Mn)和钙(Ca)等元素含量的影响,并进一步分析不同部位各元素含量间的关系。结果表明:镉处理浓度越高,其对植株生长和产量的抑制作用越显著;与对照相比,在镉添加水平为2.5和5mg·kg-1时,植株的鲜质量分别降低了14.0%和15.9%,干物质积累量降低了5.3%和7.6%,产量降低了27.9%和48.4%,而糙米中镉含量分别达到了0.35和0.65mg·kg-1,高于农业部食品安全标准(0.2mg·kg-1);生育后期叶面喷施锌肥对水稻生长和产量无明显影响,植株各部位锌含量显著增加,而Fe、Mn、Cu等元素含量受到了不同程度的影响;在2.5mg·kg-1镉处理下,叶面喷施锌肥后糙米镉含量提高41.9%,而在5mg.kg-1镉处理下,糙米镉含量却降低了15.4%;相关分析表明,糙米中镉与锌无明显相关性,而与Mn、Cu、Mg呈显著正相关。 | 索炎炎 吴士文 朱骏杰 潘风山 冯英 | 2012 | 浙江大学学报(农业与生命科学版)2012，38，4： | 38 |
| 3 | Application of Projection Pursuit Evaluation Model Based on Real-Coded Accelerating Genetic Algorithm in Evaluating Wetland Soil Quality Variations in the Sanjiang Plain, China显示文摘A new technique of dimension reduction named projection pursuit is applied to model and evaluatewetland soil quality variations in the Sanjiang Plain, Helongjiang Province, China. By adopting the im-proved real-coded accelerating genetic algorithm (RAGA), the projection direction is optimized and multi-dimensional indexes are converted into low-dimensional space. Classification of wetland soils and evaluationof wetland soil quality variations are realized by pursuing optimum projection direction and projection func-tion value. Therefore, by adopting this new method, any possible human interference can be avoided andsound results can be achieved in researching quality changes and classification of wetland soils. | FUQIANG XIEYONGGANG WEIZIMIN | 2003 | Pedosphere2003，13，3： | 33 |
| 4 | Cultivated Land Changes and Their Driving Forces——A Satellite Remote Sensing Analysis in the Yellow River Delta,China显示文摘Taking Kenli County in the Yellow River Delta, China, as the study area and using digital satellite remote sensing techniques, cultivated land use changes and their corresponding driving forces were explored in this study. An interactive interpretation and a manual modification procedure were carried out to acquire cultivated land information. An overlay method based on classification results and a visual change detection method which was supported by land use maps were employed to detect the cultivated land changes. Based on the changes that were revealed and a spatial analysis between cultivated land use and related natural and socio-economic factors, the driving forces for cultivated land use changes in the study area were determined.The results showed a decrease in cultivated land in Kenli County of 5321.8 ha from 1987 to 1998, i.e.,an average annual decrement of 483.8 ha, which occurred mainly in the central paddy field region and the northeast dry land region. Adverse human activities, soil salinization and water deficiencies were the driving forces that caused these cultivated land use changes. | ZHAOGeng-Xing G.LIN J.J.FLETCHER C.YUILL | 2004 | Pedosphere2004，14，1： | 19 |
| 5 | 遥感技术在区域土地利用/覆被变化中的应用——以福建省为例显示文摘研究目的:运用遥感技术快速查明福建省的土地资源状况与分布及其动态变化,为国土部门与政府决策提供科学依据。研究方法:采用人机交互式解译并结合自动分类对2001年LandsatTM影像进行解译。研究结果:(1)在自动分类基础上,运用人机交互式目视解译可获得较好的效果与精度。(2)福建省遥感调查土地利用总面积12398515.09hm2,林地和耕地为主要土地利用类型。(3)从土地利用变化分析,1996-2001年耕地面积减少11.78%,未利用地减少23.55%,而园地、林地、水域和城乡居民点及工矿用地增加。不同土地利用类型间也发生转移,耕地转化为林地和城镇工矿及交通用地面积突出。研究结论:运用遥感技术进行土地资源的调查与变化研究,能较准确、及时地为有关部门提供依据,并节省费用。 | 全斌 朱鹤健 陈松林 李壁成 杨勤科 | 2006 | 中国土地科学2006，20，2： | 16 |
| 6 | Sustainable Agriculture Evaluation for Red Soil Hill Region of Southeast China显示文摘Agricultural sustainability for economic development is important and a complex issue throughout the world; however,it is difficult to synthetically evaluate its use in the policy making process. The objective of this study was to evaluate sustainable agriculture in the red soil hill region of Southeast China through a newly proposed method combining four separate sub-systems: regional population (P), resource (R), environmental (E), and socio-economic (S). This new index system was proposed to appraise synthetically the agricultural sustainability of the red soil hill region from 1988 to 1996 with a two-step method assessing: a) the agricultural sustainability in each province independently and b) the relative sustainability of each province to the whole region. The first step only provided a development trend for each province based on its original situation, while the second step provided additional information on the comparative status of each province in agricultural development to the region as a whole. Higher index scores were found for the economy and resource categories denoting improvement. However, lower scores in the environment category indicated the improvement was achieved at the cost of deteriorating ecological surroundings due to an increasing population that demanded more from the agro-ecosystem and put heavier pressures on it. Results also showed that water and soil losses in this region were the major obstacles encountered in sustainable agriculture development. The assessment results were verified when compared with results from another method. This suggested that the new assessment system was reliable and credible in evaluating agricultural sustainability on a regional scale. | ZHAOQi-Guo XUMeng-Jie | 2004 | Pedosphere2004，14，3： | 13 |
| 7 | Physico-Chemical Properties and Laboratory Hyperspectral Reflectance of Coastal Saline Soil in Shangyu City of Zhejiang Province, China显示文摘45 and 50 composite soil samples were collected, respectively, from two agricultural fields, that were enclosed and reclaimed from coastal tidal-fiat areas in 1996 and 1984 respectively, in Shemgyu of Zhejiang Province, China, to investigate the physico-chemical properties and the hyperspectral characteristics of the saline soils and to make an assessment on their relationships. The reflectance spectra of saline soils were measured using a spectroradiometer in laboratory. The mean spectral curves of the saline soils from the two sites different in reclamation year showed that the saline soil taken from the recently reclaimed land with higher salinity demonstrated a lower reflectance intensity in the spectral region from about 550 nm to 2300 nm. In addition, nine absorption bands, i.e., 488 nm, 530 nm, 670 nm, 880 nm, 940 nm, 1400 nm,1900 nm, 2 200 nm and 2 300 nm, were chosen as the spectral bands to investigate the relationships between soil physico-chemical properties by means of Pearson correlation analysis. Finally, the first two principal components were calculated from nine absorption bands and used to discriminate the saline soil samples taken from two sampled fields. The results indicate that it is feasible to detect physico-chemical properties of saline soils from fields reclaimed for varying time periods on the basis of the hyperspectral data. | SHI ZHOU, HUANG MINGXIANG and LI YANInstitute of Agricultural Remote Sensing and Information System, Zhejiang University, Hangzhou 310029 (China) | 2003 | Pedosphere2003，13，3： | 12 |
| 8 | Monitoring Land Use Dynamics in Chanthaburi Province of Thailand Using Digital Remotely Sensed Images显示文摘A comprehensive method of image classification was developed for monitoring land use dynamics in Chanthaburi Province of Tailand. RS (Remote Sensing), GIS (Geographical Information System), GPS (Global Positioning System) and ancillary data were combined by the method which adopts the main idea of classifying images by steps from decision tree method and the hybridized supervised and unsupervised classification. An integration of automatic image interpretation, ancillary materials and expert knowledge was realized. Two subscenes of Landsat 5 Thematic Mapper (TM) images of bands 3, 4 and 5 obtained on December 15, 1992, and January 17, 1999, were used for image processing and spatial data analysis in the study. The overall accuracy of the results of classification reached 90%, which was verified by field check.Results showed that shrimp farm land, urban and traffic land, barren land, bush and agricultural developing area increased in area, mangrove, paddy field, swamp and marsh land, orchard and plantation, and tropical grass land decreased, and the forest land kept almost stable. Ecological analysis on the land use changes showed that more attentions should be paid on the effect of land development on ecological environment in the future land planning and management. | SHENRUNPING I.KHEORUENROMNE | 2003 | Pedosphere2003，13，2： | 12 |
| 9 | 三峡库区土地开发利用潜力与可持续发展——以重庆市万州区为例显示文摘利用建立的土地利用现状数据库,以三峡库区最大淹没区万州为研究对象,对库区土地开发利用潜力及生态安全性进行了分析和研究。揭示了库区土地资源利用中存在的主要危机是水土流失严重、生态环境脆弱,三峡工程淹没土地多、移民迁建占地比重大、人地矛盾加剧及粗放经营土地带来的安全隐患等问题。提出了保障基本农田的数量和质量、保障生态安全条件下的土地利用和建立库区土地资源安全保障体系是库区土地持续利用的战略选择。 | 黄云 廖铁军 傅瓦利 | 2006 | 中国农学通报2006，22，4： | 3 |
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