摘要
为了解地下水浅埋区重度盐碱地覆膜滴灌对土壤酶活性的影响,测定了重度盐碱地在滴灌利用过程中距离滴头不同水平位置(0～30cm)和垂直深度(0～40cm)的土壤碱性磷酸酶、脲酶和蔗糖酶活性,并对土壤酶活性的变化、空间分布特征及与土壤环境因子之间的相关关系进行分析。结果表明,覆膜滴灌促进了土壤酶活性的提高;水平与垂直方向滴头附近3种酶均易受覆膜滴灌作用影响,灌溉期间酶活性的增长与停灌期间酶活性降低均高于其他位置;土壤酶活性自滴头向四周径向减小,等值线呈椭圆形分布;相关分析表明盐碱土壤在覆膜滴灌种植2a后,土壤酶活性与环境因子、土壤酶活性之间的相关性均得到提高。因此,将覆膜滴灌技术应用于盐碱地开发利用可以提高土壤酶活性,改善土壤环境,为作物根系提供良好的生长条件。
In order to know the effects of mulch-drip irrigation on soil enzyme activities of saline-sodic soil with shallow water table,activities of alkaline phosphatase,urease,and invertase around the dripper,within 30 cm in horizontal direction and 40 cm in vertical direction from the dripper during the reclamation process,were investigated. Changes and distribution of soil enzyme activities,also their relationships with principal soil environment factors were studied. The results showed that activities of alkaline phosphatase,urease and invertase were promoted with time as the saline-sodic soil being reclaimed. Activities of the three enzymes around the dripper increased during the irrigation period and decreased as irrigation ceased in both horizontal and vertical directions. Furthermore,distributions of soil enzyme activities which decreased radially from the dripper in soil profiles were like ellipses. Correlation analysis showed that after two years of irrigation,relationships between soil enzyme activities and principal soil environment factors,also the relationship between soil enzymes,increased. Therefore,reclamation of saline-sodic soils by mulch-drip irrigation could promote soil enzyme activities,ameliorate soil environment and provide plants a good growth condition.
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2010年第3期44-51,共8页
Transactions of the Chinese Society of Agricultural Engineering
基金
中国科学院西部行动计划项目(KZCX2-XB2-13)
中国科学院知识创新工程项目(KSCX2-YW-N-080)
中国科学院百人计划
关键词
灌溉
土壤
酶活性
覆膜滴灌
盐碱地
土壤环境
irrigation
soils
enzyme activity
mulch-drip irrigation
saline-sodic soil
soil environment
