Results 31 to 40 of about 361 (96)
Shuitu Baochi Xuebao, 2000 根据合肥近郊旱地连续３年的实地观测和采样分析数据，对不同降雨强度下径流携带泥沙量和各种养分含量进行统计、分析和对比，揭示了各种养分流失与降雨强度的关系和流失行为，初步查明了旱地耕作层表土和养分的流失在不同降雨强度下的不同表现。表土和有机质的流失与雨强基本呈正相关，以径流冲刷作用为主；氮磷钾养分的流失则以径流溶蚀为主，但情况比较复杂，特别是通过“径流溶蚀”流失的养分与雨强并不是简单的正比关系 ...
周俊 朱江
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Shuitu Baochi Xuebao, 2008 采用室内模拟降雨装置研究了三峡库区坡耕地土壤养分流失规律。无论是紫色土还是黄色石灰土,坡耕地表层土壤养分含量在人工降雨后发生衰减,并表现出随雨强增大,雨后表土各养分含量衰减幅度加大的趋势,但径流和流失泥沙的养分含量与雨强无关;径流中养分含量虽低于泥沙养分含量,但养分含量的差异主要体现在全量养分含量上,而速效养分含量的差异则相对较小。对三峡库区坡耕地土壤养分流失而言,紫色土坡耕地土壤养分流失主要以流失泥沙为载体,而黄色石灰土坡耕地土壤养分流失则由流失泥沙和径流共同携带。
倪九派 +4 more
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Study on Rural Household Biogas Ecological Treatment Model for Livestock Production Pollution Controlling in Nanjing County [PDF]
, 2009 随着畜禽养殖业的快速发展，畜禽养殖污染问题日益严重，已成为我国农业非点源污染的主要来源之一，在未来一段时间内还会继续恶化。加强畜禽养殖污染防治工作，是全面落实科学发展观、建设社会主义新农村、实现和谐社会目标的必然要求。农村户用沼气生态处理模式的大力推广对解决我国农村地区的能源和环境问题具有重大意义，沼气技术与畜禽养殖业相结合的发展趋势，具有良好的前景，衡量沼气项目的实施效果显得尤为关键。因此，对农村户用沼气生态处理模式防治畜禽养殖污染进行系统研究，不仅有利于降低畜禽养殖的污染 ...
张云芳
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Response of Runoff and Sediment Yield from Maize Slope Farmland in Karst Areas to Slope Gradient [PDF]
[Objective] To elucidate the responses of surface runoff, subsurface runoff, and underground runoff hydrological pathways to slope in maize sloping farmland in Karst regions.
DAI Quanhou +4 more
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Shuitu Baochi Xuebao, 2002 采用室内模拟降雨装置研究了三峡库区黄色石灰土的养分流失规律。雨强对径流的养分浓度和泥沙的养分浓度无关 ,但可影响其浓度峰值出现时间 ,并与养分流失量呈正相关 ;径流中养分浓度远低于泥沙养分浓度 ,坡面养分流失以泥沙携带为主 ,但由于径流中养分以可溶态速效养分为主 ...
傅涛 倪九派 等
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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, 2000 坡地农林复合系统的土壤养分过程包括养分坡面流失，地下损失，系统养分循环等空间过程及土壤养分的年、季度变化的时间过程，目前，国内外的研究多局限于控制坡面流失，系统养分循环和提高土壤肥力的效果等方面，研究方法以定性研究和统计分析为主，在养分流失机理，地下损失，养分过程的区域对比等领域的研究还很缺乏，研究的深度与广度均需拓展。
许峰 蔡强国
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Impact of phosphorus loss on water environment in intensive livestock rearing areas and the countermeasures. [PDF]
, 2004 概述了畜禽养殖废物中磷的流失对水环境的影响,分析养殖废物中磷的来源和流失途径,并从保护水资源的角度提出减少畜禽粪便中磷流失的管理和控制措施。Impacts of the phosphorus losts from livestock waste on water environment were reviewed,and sources and pathways of the loss of phosphorus from livestock waste were analyzed.On such a ...
曾悦, 洪华生, 郑彧, 陈伟琪
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Analysis of the Dynamic Relationship between Runoff and Phosphorus Transport in the Menglianggu Small Watershed [PDF]
[Objective] To investigate the characteristics of runoff-phosphorus loss hysteresis relationship under different rainfall types. [Methods] This study focused on the Menglianggu small watershed in the rocky mountainous area of northern China.
HU Yanxia +5 more
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Shuitu Baochi Xuebao, 2020 通过野外径流小区人工降雨试验，研究坡形和聚丙烯酰胺（PAM）对径流量、土壤侵蚀和养分流失的影响。试验设置2个PAM施用量，分别为0，2 mg/L；9种坡形处理，即4个凹形坡，4个凸形坡，1个直形坡。结果表明：（1）与均匀坡面相比，凸形坡的平均土壤流失量、氨氮流失量和磷酸盐流失量分别增加25.12%，24.01%和26.96%，且土壤和养分流失量随着凸形坡面的凸度增加而增加，凹形坡的平均土壤流失量、氨氮流失量和磷酸盐流失量分别减小13.53%，10.85%和19.95%；（2 ...
邢伟民 +4 more
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