灌溉对黄土层中全氮含量淋失的试验研究

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。

Experimental Study of Irrigation on Total Nitrogen Leaching in Loess Layer

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/cm2,there is a negative correlation between soil nitrogen content and irrigation quota,and between soil water content,nitrogen leaching rate and n...