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前期含水量对坡面降雨产流和土壤化学物质流失影响研究
作者单位:北京市水利科学研究所,西安理工大学,中国科学院水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室
摘    要:在防止土壤侵蚀条件下,利用室内人工降雨实验,研究了土壤初始含水率对坡面降雨入渗、产流、溶质迁移规律的影响。结果表明:初始含水率越高,产流越快,达到稳定入渗率的时间也越短。在初始含水率不同时次降雨过程中养分的流失量与初始含水量具有较强的相关性。磷浓度的变化范围主要在5cm以内,随着含水量的增加有效磷向土壤中迁移的总量增加。随着含水量的增加土壤钾离子向土壤中迁移的总量减小。在相同条件下,EDI值大小顺序是:磷<钾<溴。

关 键 词:人工降雨  初始含水量  磷、钾、溴流失  有效混合深度(EDI)

Effects of Initial Water Content on Hillslope Rainfall in Filtration and Soil Nutrient Loss
Authors:KONGGang    WANGQuan-jiu    FANJun  CHENJian-gang
Institution:KONGGang1,2,WANGQuan-jiu2,3,FANJun3,CHENJian-gang1
Abstract:Under preventing soil erosion and controlling evaporation after rainfall, the effects of initial water content on hillslope rainfall in filtration, surface runoff and soil nutrient loss were studied with simulated rainfall. The results showed that when initial water content was higher, runoff generation was earlier, average infiltration rate was smaller. When initial water ration was different, nutrient loss in rainfall had close relation to initial water content. The density of phosphorus variation ranged mostly with 5cm, in company with the increase of water ration. The total available phosphorus migrated to increase in soil also. The total K migrated to decrease along with the increase of water content. At the identical conditions, the order of EDI value was:P
Keywords:Rainfall simulation  Anticedant soil water  Validity mixing depth(EDI)
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