Differences in soil cation exchange properties among different forests in the southern mountainous area of Anhui Province
In order to make clear the differences in soil cation exchange properties among different forest stands,and consequently guide the forest management,six different forest stands (Cunninghamia lanceolata,Pi-nus massoniana,Quercus variabilis,Pinus elliottii,natural broadleaf forest and Cunninghamia lanceolata-Quercus variabilis mixed forest) were selected in southern mountainous areas of Anhui Province and soils were sampled and measured for cation exchange properties. The results showed that:(1) The soil in the study area was strongly acidic,with soil organic matter concentration of 33.84-91.5 g·kg-1,total nitrogen concentration of 0.94-3.37 g·kg-1,alkali-hydrolyzable nitrogen concentration of 131.58-203.62 mg·kg-1,total phosphorus concentra-tion of 0.22-0.77 g·kg-1,and available phosphorus concentration of 0.17-0.32 mg·kg-1. (2) The cation exchange capacity was between 8.09-12.57 cmol·kg-1,and it decreased in the order of natural broadleaf forest>Pinus el-liottii forest>Pinus massoniana forest>mixed forest>Cunninghamia lanceolata forest>Quercus variabilis forest,and the difference in cation exchange capacity between different forest soils were mainly caused by the differences in soil organic matter. (3) The total exchange base cations was between 1.74-2.72 cmol·kg-1,and it decreased in the order of Pinus massoniana forest>Pinus elliottii forest>Cunninghamia lanceolata forest>Quercus variabilis forest>mixed forest>natural broadleaf forest. Ca2+and Mg2+were the major salt ions,which were formed by the preferential fixation of Ca and Mg in the process of formation.(4) The base cation saturation ranged from 13.97％-28.98％,and it decreased in the order of Pinus massoniana forest>Cunninghamia lanceolata forest>Quercus variabilis forest>Pinus elliottii forest>mixed forest>natural broadleaf forest,which can be ascribed to the differences in leaching and tree absorption of base cation. In summary,the nutrient retention ca-pacity and buffering capacity of the soil in the study area were low,especially soil available P. Among different forest stands,the nutrient retention and buffering capacity were higher in pine forests than in other forest stands,and mixed forests had higher levels of available nutrients. Thus mixed plantations of pine and other tree species are suggested to improve soil nutrient retention and buffering capacity.
southern mountainous area of Anhui Provinceforest soilscation exchange performancebase cationsoil fertility
万方数据
维普
