【作者】 张兴昌； 张亚丽； 郑继勇；

【Author】 ZHANG Xing-chang,ZHANG Ya-li, ZHENG Ji-yong(Institute of Soil and Water Conservation, Chinese Academy of Science and Ministry of Water Resources, State Key Lab. of Soil Erosion and Dryland Farming on Loess Plateau, Yangling 712100, China; Northwest Sci-tech University of Agriculture and Forestry, Yan gling 712100,China;3.Xi’ an University of Technology,Xi’an 710048, China)

【机构】 西北农林科技大学贤源环境学院； 中国科学院水利部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】 利用室内模拟降雨试验,初步探讨了径流与土壤矿质氮素的有效作用深度(Effective Depth of Interaction,EDI),对施肥和不施肥试验分别提出用拐点法和反推法确定EDI。结果表明:①径流与土壤硝态氮EDI明显大于与铵态氮EDI,两者之差为7～15 cm;②秸秆覆盖可显著增加硝态氮EDI,且覆盖量越大,EDI值越大;③施肥对土壤矿质氮素EDI几乎无影响;④EDI沿坡面分布存在差异,坡面中下部较深,坡上部较浅。更多还原

【Abstract】 According to the result of simulated runoff experiment in laboratory, the Effective Depth of Interaction (EDI) of runoff with soil mineral nitrogen is analyzed and the methods to confirm EDI of fertilization experiments and underutilization ones are proposed. The results are as follows. (i)The EDI of runoff with soil NO3--N is deeper than that of soil NH4 + -N, the shortfall is 7-15 cm. (ii)Straw cover can greatly enhance the EDI of soil NQ3--N .more cover, deeper the EDI. (iii)There is no evident influence of one type of fertilization on the EDI of aoil mineral nitrogen. (Ⅳ)It can be concluded that there are different spatial distribution of the EDI, deepest in the middle and lower parts of the slope land, while shallower in the upper parts.更多还原