摘要
菜地中过量的施用氮肥使土壤剖面中累积了大量的硝酸盐 ,会增加地下水的硝酸盐污染的风险 .选择了深根系的玉米和浅根系的空心菜间作来验证深根系作物和浅根系作物间作将降低土壤剖面硝酸盐累积的假说 .结果表明 ,间作有降低蔬菜地上部硝酸盐浓度和土壤剖面硝酸盐残留量的趋势 ;与单作种植相比 ,间作玉米的产量有显著增加 ,间作空心菜的产量没有显著降低 ;与单作玉米和空心菜相比 ,间作玉米的根系表层分布较多 ,间作空心菜的根长密度有所降低 .这为降低土壤剖面及蔬菜中的硝酸盐累积提供了新的途径 .
A hypothesis was presumed that nitrate content in soil profile would be reduced when a deep rooted cereal crop with greater N requirement is intercropped with a shallow rooted vegetable. A maize/swamp cabbage intercropping experiment was designed to test the hypothesis. The results indicated that the nitrate contents in vegetable and soil profile after harvest were reduced by intercropping, compared with sole maize or swamp cabbage cropping. The yields of intercropped maize were significantly greater than sole maize, and roots of intercropped maize were distributed more extensively in topsoil than sole maize did.
出处
《环境科学学报》
CAS
CSCD
北大核心
2003年第4期463-467,共5页
Acta Scientiae Circumstantiae
基金
国家重点基础研究专项经费(G19990 1170 7)
国家自然科学基金资助项目 ( 30 0 70 4 5 0 )
