黄河三角洲盐碱地人工林土壤肥力质量的综合评价

摘要

The nutrient contents and enzyme activities in the soils of four different plantations were analyzed in the coastal saline land of the Yellow River Delta with the control of the unplanted land .The soil fertility of four different plantations was com-prehensively evaluated using the method of subordinate function .Compared with the control , the contents of organic matter , ammonium N, nitrate N, available P and available K in soil were increased by 177.89%, 76.47%, 757.74%, 32.76% and 30.13%, respectively.The activities of mean phosphatase , catalase, urease and sucrose were increased by 47.09%, 11.52%, 41.07% and 76.00%, respectively.By subordinate function analysis , the soil fertility in different plantations was obtained in the descending order of Fraxinus chinensis (0.777), Pyrus betulifolia (0.694), Tamarix chinensis (0.572), Salix psammophila'YanliuYihao' (0.436), and the control (0.030).%以黄河三角洲滨海盐碱地柽柳、杜梨、盐柳、白蜡人工林为研究对象,未造林荒地为对照,对不同人工林的土壤养分、土壤酶活性进行测定,利用隶属函数分析法对不同人工林的土壤肥力进行综合评价.结果表明:与对照荒地相比,各人工林平均土壤有机质、铵态氮、硝态氮、有效磷、速效钾质量分数,分别提高了177.89%、76.47%、757.74%、32.76%、30.13%;土壤中磷酸酶、过氧化氢酶、脲酶、蔗糖酶活性,比对照荒地分别提高了47.09%,11.52%,41.07%,76.00%;土壤肥力综合评价分值,从大到小依次为白蜡(0.777)、杜梨(0.694)、柽柳(0.572)、盐柳(0.436)、荒地(0.030).