3种中山杉种植模式对上海沿海土壤肥力的影响

Effects of three planting patterns of Ascendens mucronatum on soil fertility in Shanghai costal areas

以上海南汇区一线沿海地区不同种植模式的中山杉为对象,选取3种种植模式,即中山杉纯林(A)、中山杉+黄豆(A+S)、中山杉+女贞+黄豆(A+L+S)以及滩涂地(CK),对土壤养分综合因子(U)和土壤酶活性综合因子V进行典型相关分析,并利用改进的层次分析法对土壤肥力进行综合评价。结果表明:二因子间存在显著的典型相关变量,其相关性主要由有效磷、全氮含量和脲酶、蔗糖酶活性引起。U值和V值在各样地不同土层中表现为表层土大于底层土的趋势(滩涂地U值呈现相反趋势);在不同样地间,U值表现为A>CK>A+S>A+L+S,V值表现为A+L+S>A+S>A>CK。土壤肥力质量指数大小顺序为A+L+S(0.86)>A+S(0.76)>A(0.68)>CK(0.30),土壤pH是土壤肥力提高的关键性限制因子。因此,该地区中山杉+女贞+黄豆是3种模式中的最优模式。

This study aimed at studying the relationship between the comprehensive factors of soil fertility and soil enzyme activity in three Ascendens mucronatum planting patterns in the first tier costal area,Nanhui district,Shanghai city.Employing three A.smucronatum planting patterns as experimental objects,including A.mucronatum（A）,A.mucronatum＋soybean（A＋S）,A.mucronatum ＋ Ligustrum lucidum ＋ soybean（A＋L＋S） and beach land（CK）,and we conducted a canonical correlation analysis between soil nutrient comprehensive factors（U） and soil enzyme activity comprehensive factors（V）,and an improved analytic hierarchy process（AHP） was used to evaluate the soil fertility quality.The result showed that there was a canonical correlationship between factor U and factor V,which caused by available P and total N,urease and invertase activity.The factor U and V values of top soil were higher than bottom soil（except for the U value of CK） in all planting patterns.In the different planting patterns,the values of U were shown as ACKA＋SA＋L＋S,and the values of V were shown as A＋L＋SA＋SACK.The soil fertility quality index（FQI） were A＋L＋S（0.86）A＋S（0.76）A（0.68） CK（0.30）.In addition,the soil pH was the key restriction factor of improving soil fertility.So the planting pattern A＋L＋S was the best in three patterns.