【摘要】 研究了苏北淤泥质海岸防护林土壤磷酸酶活性的特点以及几种酶活性的分布（剖面、水平）规律。结果表明：（1）滨海潮土中磷酸酶以碱性磷酸酶为主，占总磷酸酶活性的62．6％，因而可用碱性磷酸酶活性反映整个磷酸酶活性（y）；总磷酸酶（y）和碱性磷酸酶（x1）活性关系式为：y=－0．04765＋1．67426x1，r＝0．9731。（2）土壤酶活性在剖面上存在显著差异。对林地而言，取样深度60cm即满足精度要求（α=0．05），取样数为3～4个；当取样深度为40cm时，取样数至少4个。（3）水平方向上土壤酶活性也存在显著差异，林地和农田均大于滩地；在林地中，林龄越大其土壤酶的活性越高；农田的土壤酶活性与林粮间作的幼林相似。更多还原

【Abstract】 The paper deals mainly with the features of phosphatase and the distribution regularities of several enzymes (invertase, alkaline phosphatase, urease and protease) in afforested soils of silting coastal areas of northern Jiangsu. In the fluvo-aqinc soil of coastal afforested area, alkaline phosphatase made up 62.6% of the total phosphatase.Suppose the activities of total and alkaline phosphatase are y and x1 respectively (unit:phenol mg / g), their relation may be discribed by y=- 0.04765 + 1.67426x1, r=0.9731. Soil enzyme activities became lower from top to bottom, and they had significant differences in the soil profile. The depth of 60cm for soil sampling could completely meet the need of precision (a = 0.05) for the afforested lands and the number of soil samples was 3～4. When the depth was 40cm, the number of soil sample should be at least 4. According to variance analysis, soil enzyme activities had a significant difference in horizontal direction, being far higher in the afforested and farm lands than in the beach land. In the afforested land, the greater the forest age was, the more active the soil enzymes were. Soil enzyme activities in the farm land were similar to those under young forests with intercrops. The same results were also obtained by other statishcal methods.更多还原