Effects of Cross-slope Tillage and Increasing Organic Fertilizer on Soil Nitrogen and Phosphorus Loss Characteristics and Soil Fertility on Gentle Slope [PDF]
, 2023 [Objective] Nitrogen and phosphorus loss characteristics and soil fertility changes on a gentle slope of cultivated land were analyzed under optimal fertilization and cross-slope tillage in order to provide a basis for reducing nitrogen and phosphorus ...
Chen Jianjun +4 more
core +1 more source
Effects of Continuous Straw Returning Combined with Reduced Fertilizer Application on Rice Yield and Loss of Nitrogen and Phosphorus [PDF]
, 2022 [Objective] The effects of straw returning combined with reduced chemical fertilizer application on rice yield and nitrogen and phosphorus losses with runoff were studied in order to provide a scientific basis for the recycling and reuse of local ...
Liang Fan +8 more
core +1 more source
Effects of Configuration Ratios for Contour Planting and Replanted Sugarcane on Gully Erosion-Induced Nitrogen and Phosphorus Losses on Slopes [PDF]
, 2023 [Objective] The suitable configuration ratios for contour planting and replanted sugarcane on slopes were determined in order to provide technical support for reducing slope ditch erosion and nutrient loss, improving cultivated land quality and rational ...
Chen Tingting +8 more
core +1 more source
Effects of Different Vegetation Coverage of Vetiver in Reducing Ditch Erosion and C, N, P Loss [PDF]
, 2023 [Objective] The influences of plants on reducing ditch erosion and C, N and P loss were studied in order to provide technical support for the prevention of ditch erosion and pollution control.
Chen Tingting +8 more
core +1 more source
Shuitu Baochi Xuebao, 2023 为揭示工程堆积体平台汇流造成的水沙及氮磷养分流失特征,以矿区堆土场为研究对象,采用室内放水冲刷试验,研究不同上方来水流量(1.7,2.3,2.9 L/min)和坡度(25°,30°,35°)下地表径流、壤中流及侵蚀泥沙产生过程,分别测定氮磷养分浓度并计算流失量及贡献占比。结果表明:蒙东地区覆土排土场边坡产流方式主要为地表径流,随坡度和冲刷流量的增大,地表径流量增大,壤中流量减小。产沙量随坡度的增大先增大后减小,侵蚀产沙的临界坡度在30°附近。地表径流中铵态氮及磷酸盐流失浓度均大于壤中流 ...
樊桐桐 +4 more
doaj
Effects of Interplanting Medicinal Herbs on Runoff, Sediment and Nitrogen and Phosphorus Losses in Young Oil Tea Plantation on Red Soil Sloping Field [PDF]
[Objective] To investigate the effects and applicability of different intercropping patterns of medicinal herbs on water, soil, and nutrient losses in young oil tea gardens on red soil slopes. [Methods] Runoff plot experiments were carried out in Jiangxi
DUAN Jian +4 more
core +1 more source
Shuitu Baochi Xuebao, 2020 为揭示秸秆覆盖对东北黑土区坡耕地产流产沙及氮磷流失的阻控，通过田间试验，探讨秸秆覆盖模式下，玉米生育期对不同坡度试验小区径流、泥沙和氮磷流失的阻控效果。结果表明：随着耕地坡度的增加，地表径流量、土壤及氮磷流失量逐渐增加。玉米种植条件下，地表径流量与降雨量呈正相关，土壤流失量与降雨量不相关。秸秆覆盖模式对土壤流失的阻控效果均为随坡度的降低，阻控率增加，秸秆覆盖对地表径流和土壤流失阻控率均超过90%。土壤中氮素流失以溶解态氮为主，溶解态氮占总氮的60%以上；磷素流失以颗粒态磷为主，颗粒态磷占总磷的80%以上。
李飞 +5 more
doaj
Shuitu Baochi Xuebao, 2005 采用具有单排单灌的试验小区,对水稻田在多次天然降雨条件下形成的径流中氮磷的流失特征进行了研究。结果表明,几次降雨径流的累积量中总氮的最高浓度达到22.15mg/L,总磷的浓度达4.84mg/L,可溶态氮是天然降雨径流流失氮素的主要形态,约占总氮的70%～92%,尤其是硝态氮,约占总氮的40%～80%,而径流流失中氨态氮的浓度较小,仅占总氮浓度的3.4%～27%,颗粒态磷在径流流失磷素中占到较大的比重,可达76%～79%;几次降雨事件中总氮的累积流失负荷约在0.23～0.80kg/hm2 ...
梁新强 田光明 李华 陈英旭 朱松
doaj +2 more sources
Characteristics of nitrogen and phosphorus losses with surface runoff in typical sub-watersheds of Jiulong River watershed. [PDF]
, 2004 选取九龙江流域5个典型汇水区,通过流域主要雨季天然降雨径流过程监测,对所获得的氮磷营养盐的监测数据进行归纳与分析,着重探讨了暴雨事件下径流氮磷流失及其形态的变化规律。结果表明:暴雨事件下农业汇水区地表径流氮输出以水溶态为主,磷以泥沙结合态为主,天然林地为主的汇水区则相反,前者以泥沙结合态为主,后者以水溶态为主;5个汇水区暴雨事件中总氮最高浓度值为日常采样浓度值的2.9～11.3倍,暴雨事件中总磷最高浓度值为日常采样浓度值的2.9～20.5倍;氮磷输出量均值的差异反映氮磷输出量大小受土壤质地、施肥量 ...
张珞平 +5 more
core
Nitrogen Sources, Transports and Transformations in Headwater Catchment [PDF]
, 2007 过量施肥、化石燃料的燃烧等人类活动带来的氮负荷问题对陆地和水生生态系统的影响迅速扩大，引起了全世界的关注。当流域陆地生态体系的氮素饱和后，过量的氮素会通过地表径流和地下潜流排入溪流、湖泊、河流和海洋中。因为溪流直接迁移了流域体系过多的氮素，研究氮在溪流中的循环过程之前了解流域氮素流失到溪流的过程机制至关重要。因此，对五川流域氮素流失的过程机理进行研究以及探讨氮在溪流中的迁移转化行为，有利于阐明流域体系的氮在溪流中的循环过程。 本研究融合多学科知识，在GIS技术支持下，综合运用现场定位试验、模型模拟 ...
王吉苹
core