Results 21 to 30 of about 1,305 (157)
Shuitu Baochi Xuebao, 2005 对长江上游人工林与天然林下代表性剖面的土壤结构分析看出,人工林较天然林土壤的结构状况要差。选择12项指标对不同林地土壤结构质量进行评价,结果表明人工林土壤结构质量远不如天然林土壤。测定和计算人工林、天然林土壤的持水量和侵蚀率,也看出前者比后者的保水抗蚀性差。其原因主要与林下土壤结构质量有关。长江上游地区人工林分布面积大,现暴露出的很多问题,与其土壤结构质量低下有紧密的关系。建议加强林下土壤结构质量的保护和培育研究。
何毓蓉 廖超林 张保华
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Soil Particle Settlement Sorting and Distribution Characteristics of Carbon, Nitrogen and Salt During Gradual Thawing [PDF]
, 2023 [Objective] The classification of sediment particles and the accompanying distribution characteristics of carbon, nitrogen and salt in the process of soil thawing layer by layer under snowmelt runoff scenario were analyzed in order to identify the ...
Hu Yaxian +5 more
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Shuitu Baochi Xuebao, 2022 为探究在非灌溉季节施加生物炭对滴灌棉田耕层土壤水热特性和三相结构的调控效应。设置生物炭15(B1),30(B2),45(B3),60(B4),0(B0) t/hm25个施加量,分析其对新疆滴灌棉田非灌溉季节耕层土壤(0—40 cm)三相结构、总孔隙度、土壤温度和土壤含水率的影响。结果表明:与对照处理相比,施炭处理使土壤固相体积降低2.58%~10.74%,总孔隙度增加3.38%~12.05%;同时,施炭处理的融后土壤质量含水率较对照处理提高1.07%~2.65%;施炭处理的土壤导热系数降低 ...
邹瑞晗 +4 more
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Shuitu Baochi Xuebao, 2005 运用土壤粒径质量分布原理与分形理论,对淄川峨庄流域内7种林分和对照荒草地的土壤结构特征进行研究。结果表明:①各种林分的土壤结构明显好于荒草地,不同林分类型中混交林分明显优于单纯林。良好的林分结构能明显提高土壤粒径的分布均匀程度与范围,改善土壤孔隙状况;②分形维数和重量平均直径能比较客观地表征土壤结构特征,是较为理想的土壤结构测定指标。混交林分分形维数均低于单纯林与荒草地,土壤重量平均直径均高于单纯林与荒草坡,说明混交林土壤结构稳定性最好,土壤通透性较好,具有较高的水土保持功能;③不同林分类型之间 ...
刘霞 王丽 张光灿 刘信儒 梁华
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Shuitu Baochi Xuebao, 2023 为了明确农业生产过程中耕作方式对田间土壤孔隙结构及土壤水分运动特性的影响,以广西农地蔗田为研究对象,基于土壤切片技术分析研究免耕和垄耕2种典型耕作方式蔗田的田间土壤孔隙结构特征,并结合土柱模拟入渗试验,探究土壤孔隙结构对土壤水分运动的影响,进一步揭示孔隙结构与土壤水分运动特性之间的相互作用关系。结果表明:随着土层深度的增加,免耕蔗田孔隙形态以聚集的团块状分布为主,垄耕蔗田孔隙形态以条状分布为主。与免耕蔗田相比,垄耕蔗田的土壤总孔隙度和＞2.5 mm孔径的孔隙度分别增加32.5%和21.9 ...
刘俊杰 +5 more
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Dianci bileiqi, 2021 针对部分地区变电站建设导致的大范围土壤变化,研究这种块状土壤结构较大时产生的跨步电压二次峰值现象,解决其可能带来的问题并寻找应对措施。笔者首先运用CDEGS软件仿真还原了块状土壤面积较大时产生的这种现象,指出了其成因;并在均匀土壤结构下仿真计算了块状土壤范围、电阻率、深度等参量对这种二次峰值现象的影响;同时考虑到土壤层次化的结构特征,以200倍地网尺寸的大面积块状土壤模拟了层状土壤,衡量了层状土壤结构的存在对二次峰值的影响;在此基础上通过接地模拟试验对该现象进行了深入的探讨。结果表明 ...
陶亚光 +5 more
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Effects of different land use types on soil structure and hydraulic characteristics of reclaimed coal mines in semi-arid areas [PDF]
In order to explore the water characteristics of soil in reclaimed coal mines in semi-arid areas and make better use of the land in reclaimed mining areas, the basic physical properties, water characteristic curves, unsaturated water conductivity and ...
Duomei LI +5 more
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EFFECTS OF SOIL TEXTURE AND LIGHT ON GROWTH AND PHYSIOLOGY PARAMETERS IN KANDELIA CANDEL [PDF]
, 2001 在香港的 3个红树林样地即黄竹湾 (沙土 )、西径 (沙壤土 )和米埔 (粘壤土 )进行了土壤结构对秋茄 (K an-delia candel(L .) Druce)生长和生理影响的研究 ,并在米埔比较了林内和林外秋茄幼苗的生长和生理参数以观察光照水平的效应。在沙土和沙壤土生长的 1.5年秋茄幼苗比粘壤土具有较粗的基径和较高的总生物量 ,说明秋茄幼苗在沙土和沙壤土中比在粘壤土中生长更好。沙土 1.5年秋茄幼苗的叶片厚度分别为沙壤土和粘壤土的 1.75和 2 .0 5倍 ...
卢昌义, 叶勇, 谭凤仪
core
The Long-term Variations and Influencing Factors of Soil Saturated Hydraulic Conductivity in Terraces on the Loess Plateau [PDF]
[Objective] The long-term variations of soil saturated hydraulic conductivity (Ks) and its primary controlling factors in terraces on the Loess Plateau were explored. [Methods] Terraces were selected for three land use types, i.e.
CHANG Heng +6 more
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Influence Mechanism of Ionic Interface Reaction on Soil Porosity [PDF]
, 2023 [Objective] The changes in surface charge properties of soil particles and the net force between particles were analyzed, in order to elucidate the influence mechanism of particle interaction on pore conditions.
Ding Wuquan +3 more
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