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| 1 | One-dimensional horizontal infiltration experiment for determining permeability coefficient of loamy sand显示文摘A knowledge of soil permeability is essential to evaluate hydrologic characteristics of soil, such as water storage and water movement, and soil permeability coefficient is an important parameter that reflects soil permeability. In order to confirm the acceptability of the one-dimensional horizontal infiltration method(one-D method) for simultaneously determining both the saturated and unsaturated permeability coefficients of loamy sand, we first measured the cumulative infiltration and the wetting front distance under various infiltration heads through a series of one-dimensional horizontal infiltration experiments, and then analyzed the relationships of the cumulative horizontal infiltration with the wetting front distance and the square root of infiltration time. We finally compared the permeability results from Gardner model based on the one-D method with the results from other two commonly-used methods(i.e., constant head method and van Genuchten model) to evaluate the acceptability and applicability of the one-D method. The results showed that there was a robust linear relationship between the cumulative horizontal infiltration and the wetting front distance, suggesting that it is more appropriate to take the soil moisture content after infiltration in the entire wetted zone as the average soil moisture content than as the saturated soil moisture content. The results also showed that there was a robust linear relationship between the cumulative horizontal infiltration and the square root of infiltration time, suggesting that the Philip infiltration formula can better reflect the characteristics of cumulative horizontal infiltration under different infiltration heads. The following two facts indicate that it is feasible to use the one-D method for simultaneously determining the saturated and unsaturated permeability coefficients of loamy sand. First, the saturated permeability coefficient(prescribed in the Gardner model) of loamy sand obtained from the one-D method well agreed with the value obtained from the constant head method. Second, the relationship of unsaturated permeability coefficient with soil water suction for loamy sand calculated using Gardner model based on the one-D method was nearly identical with the same relationship calculated using van Genuchten model. | HU Shunjun ZHU Hai CHEN Yongbao | 2017 | Journal of Arid Land2017，9，1： | 3 |
| 2 | Models for calculating phreatic water evaporation on bare and Tamarix-vegetated lands显示文摘地下水是在干旱区域的自然植被的水消费的主要来源。由井的蒸发学习自然植被的生态的水需求是一条有效途径。为了学习生态的水, Tarim 河盆要求,基于以 Aksu 水平衡的赤裸的陆地上的井的蒸发的观察数据从 1989~1996 的试验性的车站由分析井的蒸发的关系,井的表面的深度和水的蒸发,拿限制井的蒸发的率作为控制条件,并且基于在水的井的蒸发和蒸发之间的关系是非线性的客观法律,我们建立当 pheratic 水平衰落就被土壤水分蒸发蒸腾损失总量从 2003 ~ 2004 在生长 Tamarix 的土地上引起时,根据井的表面和土壤潮湿的深度的数据,我们计算井的蒸发的数量并且在生长 Tamarix 的土地上为精明的井的蒸发建立模型。赤裸的土地和生长 Tamarix 的土地上的井的蒸发能被一个 Tamarix 植被变换系数互相转变。测试结果证明模型的计算精确性高,模型对 Tarim 河盆合适。 | HU Shunjun TIAN Changyan SONG Yudong CHEN Xiaobing LI Yuetan | 2006 | Chinese Science Bulletin2006，51，A01： | 3 |
| 3 | Spatio-temporal variation of soil moisture in a fixed dune at the southern edge of the Gurbantunggut Desert in Xinjiang, China显示文摘Soil moisture is critical for vegetation growth in deserts.However,detailed data regarding the soil moisture distribution in space and time in the Gurbantunggut Desert of China have not yet been reported.In this study,we conducted a series of in situ observation experiments in a fixed sand dune at the southern edge of the Gurbantunggut Desert from February 2014 to October 2016,to explore the spatio-temporal variation of soil moisture content,investigate the impact of Haloxylon ammodendron(C.A.Mey.)Bungeon soil moisture content in its root zone,and examine the factors influencing the soil moisture spatial pattern.One-way analysis of variance,least significant difference tests and correlation analysis were used to analyze the data.The results revealed that the soil moisture content exhibited annual periodicity and the temporal variation of soil moisture content throughout a year could be divided into three periods,namely,a moisturegaining period,a moisture-losing period and a moisture-stable period.According to the temporal and spatial variability,the 0–400 cm soil profile could be divided into two layers:an active layer with moderate variability and a stable layer with weak variability.The temporal variability was larger than the spatial variability in the active layer,and the mean profile soil moisture content at different slope positions displayed the trend of decreasing with increasing relative height and mainly followed the order of interdune area>west and east slopes>slope top.The mean profile soil moisture content in the root zone of dead H.ammodendron individuals was significantly higher than that in the root zones of adult and young individuals,while the soil moisture content in the root zone of adult individuals was slightly higher than that in the root zone of young individuals with no significant difference.The spatial pattern of soil moisture was attributable to the combined effects of snowfall,vegetation and soil texture,whereas the effects of rainfall and evaporation were not significant.The findings may offer a foundation for the management of sandy soil moisture and vegetation restoration in arid areas. | ZHU Hai HU Shunjun YANG Jingsong Fidele KARAMAGE LI Hao FUSihua | 2019 | Journal of Arid Land2019，11，5： | 3 |
| 4 | Theoretical analysis of the limiting rate of phreatic evaporation for aeolian sandy soil in Taklimakan Desert显示文摘Phreatic evaporation is a great lose for shallow groundwater in the Taklimakan Desert. Given soil type and groundwater table, the limiting rate of phreatic evaporation is defined as the maximum of water transferred from groundwater to soil surface per unit time, which is a key parameter and control condition for phreatic evaporation model developing. The soil water characteristic curve for the aeolian sandy soil in the Taklimakan Desert was fitted with the least square method based on the formula of soil moisture characteristics curve proposed by Van Genuchten, using observed soil moisture and soil water suction data. The unsaturated hydraulic conductivity was determined by the instantaneous profile method in situ and the calculation formula for unsaturated hydraulic conductivity was established. According to the steady flow theory, the quasi-analytical solution of limiting rate of phreatic evaporation was derived on the basis of generalization of the formula of unsaturated hydraulic conductivity. The results show that the soil moisture characteristics in the Taklimakan Desert can be well described by Van Genuchten’s formula, and the limiting rate of phreatic evaporation declines by power function with the descending of groundwater table. | HU ShunJun LEI JiaQiang XU XinWen SONG YuDong TIAN ChangYan CHEN XiaoBin LI XiuChang | 2008 | Chinese Science Bulletin2008，53，S2： | 2 |
| 5 | Suitable scale of Weigan River plain oasis显示文摘 | Hu Shunjun Song Yudong Tian Changyan | 2007 | Science in China(Series D: Earth Sciences)2007，50，1： | 1 |
| 6 | Comparing phreatic evaporation at zero water table depth with water surface evaporation显示文摘Salt-affected soils are mostly found in irrigated areas within arid and semi-arid regions where the groundwater table is shallow.Soils of this type have become an increasingly severe problem because they threaten both the environment and the sustainable development of irrigated agriculture.A tool to estimate phreatic evaporation is therefore urgently required to minimize the salinization potential of salt-affected areas.In this context,phreatic evaporation at zero water table depth(E_0)is a key parameter for establishing a model for calculating phreatic evaporation.The aim of this study was to explore the law of phreatic evaporation and to develop structurally rational empirical models for calculating phreatic evaporation,based on E_0 data of six types of soil(i.e.,gravel,fine sand,sandy loam,light loam,medium loam,and heavy loam)observed using the non-weighing lysimeter and water surface evaporation(E_(601))data observed using a E601 evaporator of same evaporation area with a lysimeter-tube at the groundwater balance station of the Weigan River Management Office in Xinjiang Uygur Autonomous Region,China,during the non-freezing period(April to October)between 1990 and 1994.The relationship between E_0and E_(601) was analyzed,the relationship between the ratio of E_0 to E_(601) and the mechanical compositions of different soils was presented,and the factors influencing E_0 were discussed.The results of this study reveal that E_0 is not equal to E_(601).In fact,only values of the former for fine sand are close to those of the latter.Data also show that E_0 values are related to soil texture as well as to potential atmospheric evaporation,the ratio of E_0 to E_(601) and the silt-clay particle content(grain diameter less than 0.02 mm)is negatively exponentially correlated,and that soil thermal capacity plays a key role in phreatic evaporation at E_0.The results of this analysis therefore imply that the treatment of zero phreatic depth is an essential requirement when constructing groundwater balance stations to study the law of phreatic evaporation. | HU Shunjun GAN Yongde CHEN Yongbao | 2018 | Journal of Arid Land2018，10，6： | 0 |
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