灌溉对黄土层中全氮含量淋失的试验研究  

Experimental Study of Irrigation on Total Nitrogen Leaching in Loess Layer

作　　者：党丽娟[1] 刘仁义 马耀光[1] 李克青[1] 

机构地区：[1]西北农林科技大学水利与建筑工程学院,陕西杨陵712100 [2]内蒙古自治区第四水文地质工程地质勘察院,内蒙古通辽028007

出　　处：《水土保持研究》2010年第1期232-234,共3页Research of Soil and Water Conservation

基　　金：国家自然科学基金(50579066)

摘　　要：通过室内土柱渗透试验及氮平衡分析,研究一定施氮水平、不同灌溉水平条件下黄土层中氮素的运移规律和淋失强度。试验结果表明:土壤水分是氮素淋失的运载介质和主控因素,当施氮水平为6mg/cm2时,渗透层土壤含氮量与灌水量呈负相关关系;土壤含水量及土壤层氮淋失率与灌水量呈正相关关系、与氮素浓度呈负相关关系;当灌水量大于229.3mm时,51cm深处土壤层氮淋失率将大于37.18%。因此,在黄土地区,为防止氮素流失和地下水污染,应严格控制灌水量。Soil infiltration experiment and nitrogen balance analysis was carried out to study the transfer regular pattern and leaching intensity of nitrogen under the certain nitrogen level and different irrigation level in loess soil.The results indicated that soil moisture is the transfer medium and controlling factor of nitrogen leaching.When the nitrogen level is 6 mg/cm^2,there is a negative correlation between soil nitrogen content and irrigation quota,and between soil water content,nitrogen leaching rate and nitrogen concentration,and a positive correlation between soil water content,nitrogen leaching rate and irrigation quota.When the irrigation quota is higher than 229.3 mm,the nitrogen leaching rate is higher than 37.18% in 51 cm soil layer.So in order to prevent nitrogen loss and groundwater pollution,the irrigation quota should be controlled strictly in loess areas.

关 键 词：黄土层 灌溉 氮素 淋失 

分 类 号：S157[农业科学—土壤学] S153.61[农业科学—农业基础科学]