摘要
设施农业中过量施肥和灌溉不仅降低肥料利用率,且容易引发硝酸盐污染风险。以库尔勒英下乡露天菜地为参照,对该地大棚菜地年度氮素输入量、土壤剖面硝态氮累积特征,以及地下水硝态氮含量进行了研究。结果表明:氮素年度输入量大棚菜地>露天菜地;两种种植方式0-180cm土壤均出现了硝酸盐的明显累积,大棚菜地硝态氮累积量随种植年限的增长而升高,并表现出明显的底层累积(60-180cm)特征,但均未超过露天菜地;对地下水调查发现硝态氮超标率达86.36%,对当地居民身体健康造成潜在威胁。因此,必须采取合理的农业管理措施,提高绿洲农业生态系统的氮肥利用率。
Excessive fertilizer level and irrigation contributing to high nitrate pollution potentials are problems because of low N use efficiency in intensive cultivation.The objectives of this study were to determine applied N,the nitrate accumulated in the 0-180 cm layer of soil profile and the nitrate concentration of the groundwater in intensive vegetable fields in southern outskirt of Korla Oasis,northwestern China.Results showed that N inputs of the greenhouse vegetables were much higher compared to the fied vegetables,remarkable accumulation of soil nitrate were occurred in the cultivated zones and the content of nitrate nitrogen trend to increased along with cultivated year,there was a marked bottom（60~180cm） accumulation which trended to increase along with cultivated year,we found that the nitrate-nitrogen concentration of groundwater exceed the provided standard in cropping areas,the rate is 86.36 %.To diminish nitrate deeper accumulation and groundwater nitrate pollution while enhance the nitrogen use efficiency in the oasis agro-ecosystem,optimal actions must be carried out.
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2011年第4期189-192,共4页
Journal of Arid Land Resources and Environment
基金
国家科技支撑计划(2007BAC20B03)资助
关键词
库尔勒
设施农业
蔬菜
土壤硝态氮累积
Korla
intensive agriculture
vegetable
nitrate accumulation
