Results 51 to 60 of about 447 (144)
A New Method to Estimate the Cover Management Factor on the Loess Plateau in China [PDF]
[Objective] To investigate the combined effect of crop cover and crop management practices on preventing soil loss and improving the accuracy of C-factor estimation. [Methods] Six millet plots with different treatments, i.
LI Qinglan +4 more
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Shuitu Baochi Xuebao, 2005 洛川塬区土壤侵蚀变化表现出不同的侵蚀期,土壤侵蚀过程就是沟谷的发育过程。通过分析洛川塬区晚中更新世以来洛河阶地和沟谷黄土、古土壤记录的古地貌形态得出,560～460kaB.P.的第一侵蚀期洛河一级支流开始广泛形成;洛河较大的二级支流形成于250～200kaB.P.的第二侵蚀期;140～95kaB.P.的第三侵蚀期洛河形成了三级支流;洛川塬区众多的冲沟主要是全新世(10～0kaB.P.)以来形成的。分析了洛川塬区不同侵蚀期形成的沟谷地貌形态。以黑木沟为例,具体分析了黑木沟的发育过程和土壤侵蚀量变化。
桑广书 甘枝茂
doaj +2 more sources
Shuitu Baochi Xuebao[目的] 为探究东北黑土区防风林带走向与主害风向的关系。[方法] 利用遥感解译和野外调查,获取研究区内林带基本特征数据,结合研究区内43个气象站点风速风向数据,对林带走向与主害风向的交角,即风向偏角进行计算分析。[结果] 蒙东黑土亚区偏西风占比大,风向较为集中,主害风主导性强烈,松嫩黑土亚区风向较为分散,主害风主导性较弱;平均林带密度松嫩黑土亚区＞蒙东黑土亚区;防风林带走向在松嫩黑土亚区占比最大的为N-S走向林带,蒙东黑土亚区没有明显的规律性;研究区内风向偏角＜30°占比为29.60%,＞30 ...
马逸雪 +4 more
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Shuitu Baochi Xuebao, 2016 在重庆市石柱县坡耕地开展保护性耕作试验，探究其对水土流失的影响。于2015年在重庆市石柱县坡耕地烟田开展试验，采用顺坡起垄的方式，设置4个处理：处理T1（不种植黑麦草），处理T2(垄间种植黑麦草)，处理T3（垄体种植黑麦草），处理T4（垄体种植黑麦草+垄间种植黑麦草）。结果表明：垄间种植黑麦草可有效减少小区径流量58.66%～65.79%，小区产沙量62.50%～68.78%的，硝态氮流失52.05%～57.22%，铵态氮流失51.03%～59.98%，总磷流失51.47%～65.88%和钾流失66 ...
郑 +8 more
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Shuitu Baochi Xuebao, 2023 为量化分析典型黑土农耕地在冻结过程中的剖面水热耦合特征,以东北典型黑土区耕层土壤为研究对象,通过室内单土柱模拟试验,并结合COMSOL Multiphysics模型PDE模块,实现黑土冻结过程中温度场与水分场的耦合求解。结果表明:(1)COMSOL模型可实现黑土剖面冻结过程的水热耦合分析,温度场(R2=0.83,RMSE=0.91 ℃)与水分场拟合效果(R2=0.88,RMSE=0.02 cm/cm3)均较好,可满足拟合精度需要;(2)黑土农耕地剖面温度的变化速率呈先快速冷却后缓慢趋于稳定的变化趋势 ...
蒋瑶钰, 王彬, 陈祖明, 王文刚
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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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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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Shuitu Baochi Xuebao目的旨在探讨土壤侵蚀-沉积过程对土壤有机碳组分的影响及其相互作用机制，以加深对东北黑土区耕地碳库管理策略及土壤有机碳响应机制的理解。方法以东北薄层黑土区（宾县）和厚层黑土区（克山县）典型坡耕地为对象，采用137Cs示踪技术定量评估土壤侵蚀强度，明晰不同土壤侵蚀强度对坡面土壤有机碳组分特征的差异及其变化趋势，揭示土壤侵蚀对土壤有机碳组分的影响机制。结果薄层黑土区年平均土壤侵蚀模数为2 822.99 t/（km²·a），厚层黑土区年平均土壤侵蚀模数为2 174.74 t/（km²·a）。土壤侵蚀 ...
周笑 +6 more
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Material Evidence Analysis and Regional Classification and Identification of Soil Based on X-ray Fluorescence Spectrometry and X-ray Diffraction [PDF]
In the field of forensic science identification, geochemical-related materials such as soils and rocks were important sources of material evidence. In actual case analysis, the information provided by material evidence often pointed to unknown areas ...
Enhao ZHAO +6 more
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Shuitu Baochi Xuebao, 2007 利用相同区域湖泊沉积物及土壤培养黑藻,分析不同层次底质中各形态磷含量和间隙水中磷浓度的变化,揭示在沉水植物作用下淹水土壤和沉积物中不同层次磷的迁移规律。结果表明,本试验条件下,土壤各层次均比营养水平相当的沉积物中磷的迁移性大,黑藻能促进上层底质中无机磷向上覆水中迁移,通过根系作用促进根尖分布层底质中有机磷的迁移转化;黑藻对沉积物下层(根尖分布层)磷迁移转化的影响小于土壤,对上层底质中磷向上覆水中迁移的影响大于土壤;黑藻通过吸收作用及改变根区环境条件,影响底质间隙水中各形态磷的浓度 ...
赵海超 +4 more
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