Results 31 to 40 of about 672 (144)
River-groundwater transformation and ecological effects in the Tuwei River watershed [PDF]
The Tuwei River, an important tributary of the Yellow River, located in the eastern Jiziwan region exhibits a close hydraulic connection between atmospheric precipitation, groundwater, and river-lake water in the watershed. This connection influences the
Fan GAO +5 more
core +1 more source
Shuitu Baochi Xuebao, 2005 通过坡面放水模拟径流冲刷试验，研究了不同放水流量下草地减水减沙效应，并从起流历时、径流流速、径流深度等方面分析了草地调控水沙的机理。结果表明：（1）草地具有显著的减水减沙效应，平均径流系数较对照减少28．3％，输沙率较对照减少78．4％。（2）裸地与草地坡面产流规律一致，裸地土壤坡面的输沙率呈先增后减再增的变化趋势，而草地坡面的输沙率呈先增后减然后逐渐趋于稳定。（3）草地能将坡面径流起流历时推迟3倍以上，可将径流流速减小40％，从而使草地坡面的径流入渗率明显增加，使径流的冲刷能力和输沙能力迅速下降。（4）
冯浩 吴淑芳 吴普特 李敏
doaj +2 more sources
Shuitu Baochi Xuebao, 2020 为揭示自然降雨下翻耕除草和坡长对紫色土氮、磷流失的影响，通过野外设置径流小区（2个坡面：翻耕除草与自然恢复；3种坡长：20，40，60 m，共9个小区），定位监测研究不同处理下产流产沙及氮、磷流失特征。结果表明，同一坡面不同坡长间产流产沙差异不显著（P>0.05）；同一坡长不同坡面处理小区的径流量、产沙量差异极显著（P0.05），其他坡长DN、DP流失量差异显著 ...
梁珂 +4 more
doaj
Analysis of the characteristics and development trends of the “7•5” catastrophic debris flow in Xiangjiao gully, Muli County, Sichuan [PDF]
On July 5, 2021, a catastrophic debris flow disaster occured in Xiangjiao gully, Muli County, Sichuan Province. This study analyzed the formation conditions, eruption process and eruption characteristics of the debris flow through field investigation and
Hao SUN +4 more
core +1 more source
Shuitu Baochi Xuebao, 2021 为揭示春季解冻期工程堆积体土壤侵蚀过程机理，以辽西地区的开挖河道工程堆积体为研究对象，采用室内模拟放水冲刷试验对春季解冻期褐土工程堆积体坡面侵蚀过程进行研究。结果表明：各解冻坡面径流量随着放水冲刷量的增加而增加，并且在相同放水冲刷量下，坡面径流量整体呈现未解冻坡面>解冻2 h坡面>解冻4 h坡面>对照；解冻时间越长，坡面对径流的延迟作用越明显；解冻时间越长，坡面侵蚀越严重。在相同放水冲刷量下，堆积体坡面总产沙量整体呈现解冻4 h坡面>解冻2 h坡面>未解冻坡面>对照。相较于对照 ...
姜倩, 李坤衡, 李宏伟, 吕刚
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
, 2019 以典型的中度退化天坑——巴家陷塘天坑为例,对其倒石坡生态交错带森林群落优势种种群进行生态位特征分析,以期为喀斯特天坑的生物多样性保护及天坑地表区域植被的生态修复提供科学参考.结果表明:土壤养分铵态氮、速效钾、有效磷相较于土壤水分和温度对天坑物种分布影响最显著,解释量分别为37.4%、32.8%、29.3%.随着天坑倒石坡坡位(坑口-上坡位-中坡位-下坡位-坑底)的变化,其林下植物生活型由常绿旱生向常绿湿中生变化,草本种群生态位重叠程度较灌木种群更大.灌木植物密花荚蒾、小雀花和草本植物一把伞南星 ...
冯洁 +7 more
core +1 more source
Shuitu Baochi Xuebao, 2018 为了研究坡面径流和壤中流中全氮（TN）的流失特征，探索坡度和雨强对TN流失的影响，以风化花岗岩母质发育的土壤为研究对象，选定坡度（5°，8°，15°，25°）和降雨强度（60，90，120，150 mm/h）作为可变量，采用原状土搬迁的方式，在室内设计的径流槽上进行人工模拟降雨试验，设计试验降雨时长为坡面径流产流后90 min，壤中流水样收集延续直至无出流为止。结果表明：（1）坡面径流TN流失浓度在产流初期快速下降，随雨强的减小或坡度的增大而增大，产流后期浓度趋于稳定且差距不大。（2 ...
邬燕虹 +3 more
doaj
Shuitu Baochi Xuebao, 2022 为探究喀斯特地区林木根系分布方式对坡面土壤侵蚀的影响，采用人工模拟降雨方法，研究林木根系3类分布方式：根系横坡方向局部裸露（横向）、根系顺坡方向局部裸露（顺向）、根系垂直坡面（垂直）的土壤侵蚀特征。降雨强度为75 mm/h，降雨历时为90 min，坡度为25°。结果表明：（1）降雨过程中，横向和垂直生长根系影响土壤入渗，壤中流和地下径流产流时间表现为顺向>横向>垂直；顺向坡面地表径流初始产流时间比横向和垂直坡面略有提前，但差异不显著（p>0.05）；（2）横向、顺向及垂直坡面地表径流总量大小表现为顺向 ...
杨秀超 +4 more
doaj
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
core +1 more source