不同套种模式对湿地松生长及地力影响

The effect of different interplanting patterns on the growth and soil fertility of Pinus elliottii

本文以20年生湿地松林分为研究对象,研究了在湿地松林下补植不同树种对上层湿地松生长和林地理化性质的影响,以期为湖南地区湿地松纯林的提质改造提供参考。结果表明:湿地松林下套种闽楠、南方红豆杉和木荷处理对上层湿地松树高和胸径生长均有影响,套种木荷处理对湿地松树高和胸径生长促进作用最大,其次为套种闽楠处理;林下套种能够改善林地物理性质,降低土壤容重,增加土壤的孔隙度、毛管孔隙度和非毛管孔隙度,除了在40~60 cm土层非毛管孔隙度大小为套种木荷处理>套种闽楠处理>不套种处理>套种南方红豆杉处理外,其余土壤孔隙度和毛管孔隙度大小均为套种木荷处理>套种闽楠处理>套种南方红豆杉处理>不套种处理;套种处理对湿地松林地地力恢复效果最好的为套种木荷处理,其次为套种闽楠处理,再次为套种南方红豆杉处理,相对于湿地松纯林能够显著提高林地土壤氮、磷、钾等养分含量。

In order to provide the reference for the improvement and transformation of Pinus elliottii pure forest in Hunan Province.20-year-old Pinus elliottii forest was collected to investigate the effects of replanting different tree species under Pinus elliottii forest on the growth and physicochemical properties of forest.The results showed that interplanting Phoebe bournei,Taxus chinensis var.mairei,and Schima superba under Pinus elliottii forest had effects on the growth of height and DBH of Pinus elliottii,and interplanting Schima superba had the greatest effect on the growth of height and DBH of Pinus elliottii,followed by interplanting Phoe bebournei.Interplanting under the forest can improve the physical properties of soil,reduce soil bulk density,and increase soil porosity,capillary porosity,and non-capillary porosity,except that in 40~60 cm soil layerruns,non-capillary porosity was interplanting Schima superba>Phoebe bournei>non-interplanting>Taxus chinensis var.mairei.Other soil porosity and capillary porosity were shown as interplanting Schima superba>Phoebe bournei>Taxus chinensis var.mairei>non-interplanting.The best effect of interplanting treatment on soil fertility restoration of Pinus elliottii forest was Schima superba interplanting,followed by interplanting Phoebe bournei,and then interplanting Taxus chinensis var.mairei.Compared with Pinus elliottii pure forest,it can significantly improve the content of soil nitrogen,phosphorus,potassium,and other nutrients,etc.