摘要
采用调查研究与化学分析相结合的方法,对设施农田土壤生态环境恶化的原因进行了初步研究。结果表明,长期过量施肥导致了设施农田土壤环境的恶化。土壤速效P、速效K累积量很高,分别达691.9和623.5 mg.kg-1,100%处于高水平;碱解N含量较低,平均为138 mg.kg-1;土壤盐分含量为0.168%,80%的样本出现盐渍化现象;土壤pH值呈下降趋势,较露地下降了0.3;有机质含量较低,平均值为16.5 g.kg-1;土壤有效Zn、Mn、Cu含量都处于中高水平,大量元素和微量元素的比例失调。
Through field investigation and chemical analysis,the reasons why soil ecological environment deteriorated on facility farmland were studied.Long-term using fertilizer excessively led to soil environment deteriorated.Soil available phosphorus and potassium were 691.9 mg·kg^(-1)and 623.5 mg·kg^(-1),respectively,which were at a high level of soil fertility.Soil organic matter,available nitrogen were 16.5 g·kg^(-1)and 138 mg·kg^(-1)respectively,which was at a low level.Soil salt was(0.168)%,and 80% of the samples had secondary salinification.The pH value tended to fall,decreasing 0.3 on facility farmland than that on farm land.Soil available manganese,copper and zinc were all at a middle or high level of soil fertility.There existed an imbalance between macroelement and microelement.According to these,some suggestions were proposed for improving the quality of the soil environment through fertilizer application,which provided the theoretic basis for prolonging the useful life of the facility farmland and boosting the ecological agriculture.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2005年第z1期81-84,共4页
Journal of Agro-Environment Science
关键词
设施农田
过量施肥
土壤生态环境
平衡施肥
facility farmland
excessive fertilization
soil ecological environment
balanced fertilizing
