Results 21 to 30 of about 861 (110)
Research on Bamboo Riparian Buffer Ecosystems for Diffuse Pollution Prevention [PDF]
, 2010 进入农业系统的过量氮(N)、磷(P)极易通过地表径流或地下潜流、渗漏及农田排水进入水环境，引发水体富营养化。具有一定群落结构的河岸植被土壤系统内部具有较大的生物生存空间和相互作用区域，其间生物地球化学联合机制，可以减缓径流、捕获泥沙、截断或去除地表径流、壤中流或渗漏水及浅层地下水中的氮磷等元素，有效改善受纳水体的水质。了解河岸植被土壤系统削减污染物和净化水质的机制及其影响因素，有助于加强对河岸带的管理和重建工作，为防治面源污染提供科学依据。 本文采用土壤剖面渗透水分层采集装置 ...
方婧
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Principles and key technologies for the large-scale ecological utilization of coal gangue [PDF]
Coal is the main energy in our country and the ballast stone of energy security. As an inevitable product in the process of coal mining and coal washing, coal gangue has an annual output of more than 700 million tons, which is in urgent need of large ...
Yanling ZHAO, Zhen MAO, Zhenqi HU
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Shuitu Baochi Xuebao, 2007 利用农田土壤剖面染色并结合田间硝态氮示踪的方法,研究了太湖地区典型的水稻土—白土剖面中优势流和硝态氮在土壤剖面中的运移规律。结果表明:染色法可以分析土壤剖面中大孔隙的分布状况和优势流的路径;染色面积越大的土层,表明该土层的大孔隙含量就越高。在白土剖面上,表层的大孔隙含量最高,20~30 cm和55~100 cm土层以下大孔隙含量都很低。在田间条件下,优势流是影响硝态氮迁移的主要因素;白土剖面中优势流直接影响的最大深度为78 cm,对地下水的影响很大。本试验中地下水的硝态氮含量比未试验前增加了10多倍 ...
陈效民, 吴华山, 沃飞
doaj +2 more sources
Distribution Characteristics of Phosphor and Sulfur in Different Wetland Soils of the Yellow River Delta [PDF]
, 2010 以黄河口滨岸潮滩湿地为研究对象,研究了不同植被群落覆盖下湿地土壤中磷、硫的变化特征及其储量状况。结果表明,植被群落的变化能够影响土壤中磷、硫的含量,但影响程度不同。沿植物群落演替方向,土壤全磷含量差异不显著,变异系数较小,而全硫含量受影响显著,呈“S“型波动变化;在垂直分布特征方面,全磷的差异程度不大,表明土壤中磷含量主要取决于成土母质,相对而言,硫的垂直分布特征存在较大差异,大部分采样点的变异系数在10%以上,属中等变异,其分布特征主要受制于土壤有机质的分布 ...
孙万龙 +3 more
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Distribution Pattern of Cadmium in the Profile of Shallow Fissure Soil and Its Influencing Factors in Karst Areas with High Geological Background [PDF]
[Objective] To study the vertical distribution pattern of cadmium (Cd) in shallow karst fissure soil, analyze the impacts of various factors on the distribution of Cd in fissures, and provide a scientific basis for future research on the distribution ...
CAI Huayin +6 more
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Dynamic Simulation of Soil Moisture Under Typical Land Preparation in Semi-arid Loess Area Using HYDRUS-1D Model [PDF]
, 2023 [Objective] The dynamic characteristics of soil moisture under different land preparation measures were analyzed in order to provide a scientific basis for assessing the eco-hydrological benefits of slope land preparations and for promoting vegetation ...
Dong Hongxia, Wei Qiang, Zhang Qindi
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Urban Soil and Its Relationship to Landscape Planting [PDF]
, 2003 城市土壤是影响城市绿化植物生长的重要环境因子。从城市土壤的物理化学特征如结构、土壤容重和紧实度、城市土壤的水分供应、土壤有机质与养分含量、土壤酸碱度、土壤次生盐渍化和盐基饱和度等角度讨论了城市土壤与城市绿化植物生长之间的关系。城市绿化应该从土壤抓起。Soil is one important factor influencing the growth of plant species in the urban.
林鹏, 王文卿, 王良睦
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, 2007 在滴灌条件下,利用流动分析仪测定基因型差异较大的陆地棉和海岛棉在不同施氮水平下,各主要生育期0~60 cm土壤无机氮含量,对土壤氮素营养诊断及氮肥推荐技术基因型间的异同进行试验研究。结果表明:不同棉花品种0~20 cm土壤Nmin含量与施氮量和产量均有显著的正相关关系,采样深度增加相关性降低,品种间基肥和追肥总量氮肥推荐指标差异不显著,可采用同一标准。但由于2个品种各时期吸收氮的能力不同,不同品种主要生育时期最佳供氮量,植株全氮含量和收获后0~60 ...
仲桂军, 冯固, 田长彦, 马英杰
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Shuitu Baochi Xuebao, 2011 在辽东湾沿岸区域采集了20个土壤表层样和7个非耕作土壤剖面样(其中一个为标准剖面),通过对采集的土壤样品中的137 Cs进行测量与分析,确定该区域土壤中137 Cs的背景值,并探讨了土壤中137 Cs的分布特征。结果表明,研究区137 Cs的背景值为(1 704±40)Bq/m2;表层土壤中137 Cs的比活度范围为0.84～19.90Bq/kg,不同土地利用类型表层土壤中的137 Cs比活度有明显差异,比活度高低依次为:草地>盐碱地>耕地;非耕作土壤剖面中137 Cs的总量范围为65～1 535Bq ...
何坚, 潘少明
doaj
Soil Preferential Flow Characteristics in Coal Mine Subsidence Area under Different Rainfall Duration [PDF]
[Objective] Research on the preferential flow characteristics triggered by cracks in coal mining subsidence areas can provide support for scientific and rational development of water resource management and ecological management practice in the mining ...
DAI Bin +4 more
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