Results 71 to 80 of about 446 (142)
Effect of Freezing on Wind Erosion Resistance of Sand Dune Soil [PDF]
[Objective] To investigate the effect of winter soil freezing on soil erodibility and anti-erodibility in the Yellow River section of the Ulan Buh Desert.
DOU Chunhua +4 more
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[Chemical diversity of dissolved organic matter revealed by ultra performance liquid chromatography-Fourier transform ion cyclotron resonance mass spectrometry]. [PDF]
Se Pu, 2023 Ma C, Ni HX, Qi YL.
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Distribution Characteristics and Coupling Relationship Between Soil Erosion and Hydrologic and Sediment Connectivity in Changchong River Basin [PDF]
[Objective] To clarify the distribution characteristics and coupling relationship between soil erosion and hydrologic and sediment connectivity in Changchong River Basin, and to provide basis for soil erosion control and soil erosion prevention in this ...
LI Jianing +4 more
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Shuitu Baochi Xuebao, 2016 通过对重庆合川和云南楚雄紫色土坡耕地野外调查和室内土壤物理力学性质分析，对比研究了紫色土坡耕地耕层土壤的蓄水、稳定及耕性特征。结果表明：（1）紫色土坡耕地耕层土壤入渗速率随土层深度而降低，0—20，20—40，40—60 cm耕层土壤稳定入渗率分别为5.80～9.58，2.81～4.35，0.98～1.96 mm/min；而相应深度土壤最大有效库容分别介于49.93～66.26，46.04～59.05，37.42～43.55 mm范围，0—20 cm土壤兴利库容高产耕层大于低产耕层；（2 ...
丁文斌 +4 more
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Shuitu Baochi Xuebao, 2017 为探究南方地区典型土壤水力性质的差异，采用压力膜法、定水头渗透法和一维水平土柱吸渗法对粘性潮土、沙性潮土、红壤、水稻土和紫色土5种南方典型土壤的水动力学参数进行室内测定，对比分析了各土壤水力特征的差异及其产生的原因。结果表明：土壤质地和粘粒含量是影响土壤水力特征的主要因素；粘性潮土、沙性潮土属于级配良好土，而红壤、紫色土、水稻土属于级配不良土，粘性潮土、沙性潮土、红壤、紫色土、水稻土饱和导水率依次增大，分别为1.75×10-3，3.15×10-3，4.77×10-3，11.02×10-3，11.87 ...
胡传旺, 王, 刘, 袁, 李裕元
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, 2006 福建邵武将石地区的植物区系处于泛北极植物区,中国-日本森林植物亚区的华东地区,有维管束植物173科461属915种(含种下单位).该区植物种类丰富,具有许多珍稀、古老、孑遗植物成分.在科、属水平上对其区系特征进行了分析,结果表明:热带分布类型的科占绝对优势,共77科,占53.1%;温带分布类型有37科,占25.5%;属的区系成分中,属的热带分布类型计197属,占区总属数的52.2%,温带分布类型共有169属,占44.9%.可见该植物区系的热带、亚热带成分占主导地位,温带成分次之 ...
侯学良, 李振基, 林鹏, 陈俊德
core
Effects of Water and Nitrogen Management on Soil Nitrogen Metabolism Enzyme Activity and Wheat Nitrogen Utilization [PDF]
[Objective] To explore the effects of water and nitrogen management on soil nitrogen metabolism enzyme activity and wheat nitrogen utilization under irrigation based on soil moisture.
CUI Zhenkun +4 more
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Shuitu Baochi Xuebao, 2011 土壤表土结皮对坡面侵蚀过程具有重要影响,利用模拟降雨条件下土壤贯入和产流产沙试验,对不同降雨场次紫色土和黄壤表土结皮特征及坡面侵蚀响应进行研究。结果表明:(1)PT型贯入仪测定的贯入数值(P)与含水率(θ)成标准指数函数关系。(2)不同降雨场次表土结皮存在无结皮→弱结皮→强结皮→弱结皮→新结皮的动态发育过程,相同降雨条件下黄壤表土结皮强度大于紫色土的。(3)持续降雨过程不同降雨场次土壤表土结皮对溅蚀影响不明显,而与产流存在显著的动态响应关系,结皮强度越大产流量也越大 ...
陈正发 +4 more
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Effect of Hydroxide-Based Ionic Liquids on the Determination of Available Phosphorus in Alkaline Soils [PDF]
The level of available phosphorus in soil significantly impacted plant growth, soil fertility, and agricultural productivity. However, in alkaline soils, phosphorus mobility was low and was often tightly bound to minerals and organic matter, complicating
Chengzhong HE +6 more
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Shuitu Baochi Xuebao, 2003 利用GIS软件综合处理研究区大量与土地利用相关的基础数据,分析土地开发整理的背景与条件,调查测算土地整理、复垦和开发潜力,针对紫色土丘陵区土地资源利用的现状及特点,从多方面探讨了土地整理的迫切性。依据经济、社会、生态相统一的目标,划定土地开发整理区,确定土地开发整理的方向及重点。提出了紫色土丘陵区土地可持续利用的对策。
黄云 向华辉 等
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