摘要
采用小型回填式土柱动态淋溶实验方法,研究了科尔沁沙地不同土地利用结构耕层土壤硝酸盐氮淋失规律。结果表明,科尔沁沙地草地、林地和沙荒地结构淋溶液硝酸盐氮浓度平均值低于地下水Ⅰ类水质标准(2.0mg·L-1),农田结构淋溶液硝酸盐氮浓度平均值大于地下水Ⅰ类水质标准。农田结构是造成地下水硝酸盐氮污染的重点区域。科尔沁沙地不同土地利用结构硝酸盐氮淋失强度依次为:农田(96.54kg·hm-2·a-1)>沙荒地(32.84kg·hm-2·a-1)>林地(28.66kg·hm-2·a-1)>草地(15.48kg·hm-2·a-1)。农田是科尔沁沙地氮素营养管理的重点结构,硝酸盐氮淋失强度与土壤硝态氮含量呈极显著正相关。
Leaching law of nitrate-nitrogen from different used sandy soil in Horqin was studied by dynamic leaching experiment in a small backfilled earth-pillar.Results indicated that,the average of concentration of nitrate-nitrogen leaching in grassland,forestland,sandy wasteland was less than the quality standardⅠof groundwater（2.0 mg·L-1）.But the average of concentration in farmland was more than the quality standardⅠof groundwater.Consequently,farmland was a significant area in nitrate-nitrogen pollution of groundwater.The order of leaching intensity was：farmland（96.54 kg·hm-2·a-1）sandy wasteland（32.84 kg·hm-2·a-1）forestland（28.66 kg·hm-2·a-1）grassland（15.48 kg·hm-2·a-1）.Furtherly,main of nitrogen-nutrition management was farmland.The correlation analysis was investigated and made a conclusion that,there was a highly obvious positive correlation between leaching intensity and nitrate-nitrogen content of sandy soil.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2011年第10期2054-2060,共7页
Journal of Agro-Environment Science
基金
辽宁省教育厅科研项目(20060391)
关键词
科尔沁沙地
土地利用结构
沙土
硝酸盐氮淋失强度
Horqin sandy
land use structure
sandy soil
intensity of nitrate-nitrogen leaching
