矿质肥料对杉木苗根区土壤生化性的影响

矿质肥料地施用显著地增加了杉木苗根区土壤的微生物数量，微生物总数３个处理氮，磷钾氮磷钾分别是对照２．２９倍，１．１４倍和２．８９倍，其中细菌增加幅度最大，其次是真菌。矿质矿料对非根区土的微生物数量无明显影响，矿质肥料对杉木苗根区土壤酶活性影响较复杂。脲酶和蔗糖酶的活性不受矿质肥料影响，磷钾和氮磷钾处理均能显著提高蛋白酶活性，单施氮肥能很激活磷酸酶，而氮磷钾混施特别是磷钾混施不仅不能增强其活性，反而

.Effect of Mineral Fertilizer on Biochemical Properties of Root Region Soil under Chinese Fir Seedling

Microbal number at the root region soil under Chinese fir seedlingwas greatly increased after applyiilg mineral fertilizer,Under N,PK andNPK treatments,the total microbal number was 2.29,1.41 and 2.89 timesthat of check,respectively. Bacteria number increased Was the most,andthen fungi.On the contrary,mineral fertilizers not had a remarkable effecton the microbal number at the nonroot region soil as a whole.Mineral fer-tilizers were responsible for the complex changes of enzymitic activities ofsoil.For instance,urease and sucrase were not affected by fertilizers.Un-der PK and NPK treatments,protease was greatly activited.Phosphatasecould be prominently activited only applying N Under PK,espectively NPK,however,phosphatase was not activited but unactivited,After usingmineral fertilizers,polyphenol oxidase at the root region soil became moreunactive,and every kinds of enzyme was unactivited at the nonroot regionsoil in some extent.