苏南丘陵地区森林土壤酶活性季节变化

研究了苏南丘陵区不同林分土壤养分、酶活性的剖面分布以及酶活性的季节动态变化特征。研究结果表明,研究区土壤偏酸性,土壤中TN质量分数较高,有机质、TK、AK质量分数中等,TP、AP质量分数较低,土壤TN、有机质、AK、AP的质量分数及蔗糖酶、脲酶、H2O2酶、磷酸酶活性随着土壤深度的增加而逐渐降低。土壤酶活性在不同季节也存在差异,蔗糖酶活性的季节变化表现为：秋季〉夏季〉春季〉冬季,脲酶活性为：夏季〉春季〉秋季〉冬季,毛竹林土壤的磷酸酶活性为：秋季〉春季〉夏季〉冬季,其它3种林分土壤的磷酸酶活性为：秋季〉夏季〉春季〉冬季,H2O2酶活性在马尾松、麻栎、毛竹林土壤内表现为：春季〉秋季〉夏季〉冬季,在杉木内林土壤内表现为：春季〉夏季〉秋季〉冬季。在α=0.01或α=0.05水平下,土壤酶活性与土壤TN、AP、AK、有机质及重元素Pb、Cu、Zn、Cr、Ni呈显著或极显著相关,与土壤容重呈显著或极显著负相关,冬季蔗糖酶与其它3个季节的蔗糖酶呈现极显著或显著正相关;秋季磷酸酶与其它3个季节的磷酸酶呈现极显著或显著正相关;夏季脲酶与其它3个季节的脲酶呈现极显著正相关;夏季H2O2酶与其它3个季节的H2O2酶呈现极显著正相关。

Season variations of forest soil enzyme activities in the hilly region of southern Jiangsu province

The soil physical and chemical properties with soil depth and seasonal variations of soil enzyme activities were studied in the hilly of southern Jiangsu Province.The results indicated,the soil is slightly acid in research region,the content of total nitrogen（TN） was sufficient,the content of soil organic matter（SMO）,total potassium（TK）,available potassium（AK） were medium,and the content of total phosphorus（TP）,available phosphorus（AP） were insufficient.The content of TN,MO,AK,AP and the soil enzyme activities all declined with the depth of soil.The seasonal variations of sucrase were： autumnsummerspringwinter,for the urease were： summer spring autumn winter,for the phosphatase in Phyllostachys pubescens was： autumn spring summer winter,and in the other 3 forest stands were： autumn summer spring winter,for the catalase in Cunninghamia lanceolata was： spring summer autumn winter,and in the other 3 forest stands were： spring autumn summer winter.In the level of α=0.01 or α=0.05,soil enzyme activities had significant correlation with TN,AP,AK,MO,Pb,Cu,Zn,Cr,Ni,and have negative significant correlation with soil bulk density.The sucrose in winter,the phosphatase in autumn,the urease and catalase in summer have positive significant correlation with the same soil enzyme activities in other 3 seasons.