Results 61 to 70 of about 7,393 (182)
Shuitu Baochi Xuebao, 2007 选择三江平原小叶章湿地不同水分带上的两种土壤类型(草甸沼泽土和腐殖质沼泽土)为研究对象,运用模拟土柱的方法,研究了两种土壤中硝态氮和铵态氮的垂直运移规律。结果表明:在水分饱和条件下,两种土壤的硝态氮和铵态氮穿透曲线均符合Gauss单峰模型(R2≥0.85),其运移过程主要受粘粒含量的影响;随粘粒含量增加,硝态氮和铵态氮穿透曲线整体上峰值降低,峰面分布变宽,但不同土壤各土层间也存在一定差异,原因与不同土层水分构成、溶质运移方式以及硝化-反硝化作用的差异有关;溶质浓度加倍后,两种土壤0~20 ...
孙志高, 刘景双
doaj +2 more sources
Shuitu Baochi Xuebao, 2018 通过对西安粉壤土进行4种膜孔直径（6，8，10，12 cm）的浑水膜孔肥液自由入渗室内试验，观测并分析了湿润锋运移距离、累积入渗量、湿润体内水分分布以及NO-3-N和NH+4-N运移特性的变化规律。结果表明：膜孔直径对浑水膜孔灌土壤水氮运移特性具有较为显著的影响。不同膜孔直径的浑水膜孔灌肥液自由入渗累积入渗量符合Philip入渗模型；湿润锋运移距离与入渗时间呈极显著的幂函数关系；在相同的入渗时间内，膜孔直径越大，湿润锋运移距离越大，单位膜孔面积累积入渗量越小，同一位置处土壤NO-3-N和NH+4 ...
刘利华, 费良军, 陈琳, 白瑞
doaj
Effects of PBAT on Soil Water and Salt in Maize Root Zone and Maize Yield in Saline-alkali Land [PDF]
[Objective] In order to reduce soil pollution caused by plastic film, the application effect of using PBAT fully biodegradable plastic film instead of ordinary PE plastic film combined with drip irrigation to grow maize in mild secondary salinized soil ...
HOU Jiana +6 more
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Shuitu Baochi Xuebao, 2011 "改排为蓄"是盐碱地治理方法的重大创新,为揭示蓄水条件下蓄水沟水体与相邻土壤之间的动态循环压盐机理,进行水体与土壤之间盐分运移试验.通过对蓄水水位70 cm→40 cm→20 cm的循环变化,研究水体和不同土层盐分运移规律.试验结果表明:蓄水水位由高到低循环变化对水体与土壤之间盐分运移有着至关重要的作用,当蓄水位以70 cm→40 m→20 cm的循环变化时,0-65 cm土层含盐量逐渐减少,65-100 cm土层含盐量逐渐增加.通过蓄水水位升降的循环变化,可以使表层土壤的盐分逐渐减少 ...
冯琛 +5 more
doaj
Transpiration Characteristics of Common Trees and Their Responses to Meteorological Factors in Secondary Forests on Karst Slopes [PDF]
[Objective] To explore the transpiration characteristics of common trees and their responses to meteorological factors in secondary forests on karst slopes.
DAI Quanhou +3 more
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Gaoya dianqi, 2000 对户外运行多年的硅橡胶合成绝缘子的研究表明，硅橡胶中所含小分子在运行中未见明显减少；同时，实验室分析表明，硅橡胶中只要含有极少量的小分子，就具有较好的憎水迁移性，硅橡胶合成绝缘子在服役期内始终具有憎水迁移性。
鲁志伟
doaj
Study on the effect of layered structure of overlying strata on soil damage in mining areas in the loess covered region of northern Shaanxi [PDF]
Ecological protection in coal mining areas is a major problem that needs to be solved urgently for high-quality development in the Yellow River Basin. Scientific understanding of the response law of the overlying strata of the coal seam to the surface ...
Jiangbo WEI +7 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
core
Effects of Hydropower Station on the Temporal and Spatial Changes of Vegetation in the Middle Reaches of the Jinsha River [PDF]
[Objective] To explore the effects of hydropower stations on the temporal and spatial changes of vegetation, clarify the response relationship of vegetation changes to hydropower station construction and climate factors, and provide a reliable scientific
DAI Zuomin +3 more
core +1 more source