Results 21 to 30 of about 1,887 (144)
Shuitu Baochi Xuebao, 2004 土壤容重和饱和导水率是影响坡地土壤入渗产流和抗侵蚀能力的两个重要因素,研究径流小区表层土壤容重和饱和导水率在坡面的空间变化规律,有助于深入理解坡地的降雨入渗产流产沙规律。借助经典统计学和地质统计学,采用1m网格布点法对神木六道沟流域41m×5m径流小区表层土壤容重和饱和导水率坡面空间变异规律进行研究,结果表明:(1)表层土壤容重沿坡面的变化没有明显的规律,经地质统计学分析土壤容重具有明显的空间结构和自相关特征,自相关特征长度为7.6m。(2)表层土壤饱和导水率在坡面的变化也不具备明显规律 ...
郑纪勇 邵明安 张兴昌
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Shuitu Baochi Xuebao, 2022 为分析不同梯度盐渍土土壤的物理性质与水动力学性质变异状况,在江苏沿海连云港市徐圩新区开展了试验研究。对5种不同盐渍化级别土壤进行取样,测定其pH、ECe、容重、总孔隙度、含水率和饱和导水率等,分析不同级别滨海盐渍土壤物化特性参数和水动力学性质变化规律。结果表明:(1)不同级别盐渍土0—50 cm剖面土壤ECe先变小后增大,但40—50 cm剖面ECe明显大于0—10 cm剖面。非盐渍土和极重度盐渍土0—50 cm剖面土壤ECe变化较小,轻度盐渍土、中度盐渍土、重度盐渍土的0—50 ...
祝瑜 +6 more
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Effects of Vegetation Restoration on Soil Infiltration and Runoff in the Gully Regions on the Loess Plateau [PDF]
[Objective] To study the effects of vegetation restoration on rainfall infiltration and runoff is of great theoretical and practical value for rational utilization of watershed water resources and ecological construction.
BAI Yungang +4 more
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Shuitu Baochi Xuebao, 2017 双环入渗仪是田间测量土壤入渗过程和饱和导水率最常用的经典方法，但入渗仪内外环尺寸均会影响其测定结果。设计7组不同内外径的双环入渗仪，在位于祁连山区的黑河上游平坦草地开展多次野外土壤入渗试验，对比分析双环入渗仪内外环尺寸对土壤入渗率和饱和导水率的影响。结果表明，双环入渗仪内径相同时，外径越大则稳定入渗率和饱和导水率越小；外径相同时，内径越小则稳定入渗率和饱和导水率越小。初始入渗率与双环入渗仪尺寸关系不显著，但稳定入渗率和饱和导水率与入渗仪缓冲指数呈显著负相关。综合考虑安装简便，用水条件 ...
阳 +5 more
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Spatial-temporal Patterns and Factors of Soil Moisture in the Middle Reaches of the Yellow River under Changing Environments [PDF]
[Objective] To identify the main driving factors of soil moisture in the middle reaches of the Yellow River, to analyze the impact of land cover and climate change on soil moisture changes in the middle reaches of the Yellow River, and to provide a ...
HAN Qinggong +3 more
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Systematic protection and restoration of water bodies in collapse areas based on surface runoff regulation [PDF]
In order to solve the problems of surface runoff disorder, poor water connectivity, and weak hydrodynamic water circulation capacity in high groundwater level mining areas in the east, and to reduce the non-point source pollution and point source ...
Dong GUO +5 more
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Shuitu Baochi Xuebao, 2001 太湖地区主要水稻土类型的水分参数研究结果表明 ,水稻土 4个土层的土壤水分特征曲线基本一致。土壤的饱和含水量、田间持水量、凋萎系数和土壤有效水的含量均从土壤上层到下层呈降低的趋势 ;土壤的非饱和导水率与负压水头之间呈负相关的指数曲线变化 ,当负压水头达到 10 k Pa时 ,非饱和导水率降低到最小值 ,且基本趋于稳定 ;非饱和土壤水扩散率变化于 1.1× 10 - 3～ 1.886× 10 - 3cm2 / min之间 ,非饱和土壤水扩散率随含水量也呈指数曲线变化。
陈效民 潘根兴 沈其荣 王德建
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Exploration on the surface water leakage mechanism of travertine pools in Salix cupularis shrub area of Huanglong Scenic Spot, Sichuan Province [PDF]
Recently, some travertine landscape groups in Huanglong Scenic Spot have been degraded to varying degrees. Surface water leakage, blackening and desertification have occurred on a large scale in the dense distribution area of Salix cupularis shrub, which
Dong SUN +8 more
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Shuitu Baochi Xuebao, 2019 选取黄土丘陵区12种典型植被样地，通过测定各样地不同土层植物残体生物量、土壤容重、毛管孔隙度、非毛管孔隙度及饱和导水率，研究各指标随土层深度和植被类型的变化规律及其对土壤饱和导水率的影响。结果表明：（1）除容重随土层深度增加外，植物残体、毛管孔隙度、非毛管孔隙度和饱和导水率均随土层深度减少，其中植物残体大多集中于表层土壤（0-10 cm），占总残体生物量的51.4%~85.7%。（2）不同植被类型其植物残体及土壤物理性质存在显著差异，乔木林地植物残体、农耕地土壤容重 ...
李永宁 +4 more
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Research Progress of Nitrogen Leaching in Farmland Soil [PDF]
, 2014 对农田土壤氮素淋失的相关研究进行综述和总结是研究农业面源氮素污染的一个至关重要的前提。本文从土壤氮素渗漏淋失形态和迁移机理、氮素渗漏淋失的研究方法和影响土壤氮素渗漏淋失的因素三方面进行了详细的分析介绍,概述了近年来国内外农田氮素渗漏淋失的研究进展和研究成果,并在此基础上展望了未来氮素淋失研究工作的重点。研究结论对农田土壤的水肥管理措施及浅层地下水硝氮污染的减缓有一定的理论和借鉴意义Reviewing and summarizing the related research of farmland ...
朱木兰, 李青松, 王吉苹
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