补植改造对大兴安岭白桦低质林土壤养分的影响

Effects of Replanting Alterations of Betula platyphylla Low-quality Forest on Soil Nutrients in Daxing'an Mountains

对大兴安岭林区新林林业局白桦低质林进行不同密度的补植改造,采用灰色关联分析法和变异系数法对各补植改造样地的土壤养分进行分析。结果表明:7个补植样地的灰色关联值,从大到小依次为BZ5(0.886)、BZ6(0.794)、BZ4(0.681)、BZ3(0.651)、BZ2(0.582)、BZ1(0.577)、CK(0.547)。与对照样地相比,补植改造后各样地的土壤养分均有不同程度的提高,且随着补植密度的增大,土壤养分先增大后减小,其中BZ5样地的灰色关联度最高,表明补植密度为900株·hm^(-2)的改造方式最有利于土壤养分的积累,适宜大兴安岭白桦低质林的补植改造。

The different density of replanting alterations were conducted to focus on Betula platyphylla low-quality forest in Xinlin Forestry of Daxing’an Mountains.The evaluation system of soil nutrient was established with grey relational analysis method and variation coefficients.The grey relation degrees of soil nutrients in seven different plots were BZ5（0.886）,BZ6（0.794）,BZ4（0.681）,BZ3（0.651）,BZ2（0.582）,BZ1（0.577）,and CK（0.547）.Soil nutrients were increased compared with the control plot in different degree after replanting alterations,with the increases of replanting density,the soil nutrients in different plots increased firstly and then decreased,and the grey relation degree of BZ5was the highest,which indicated that the integrated density of 900 tree·hm^（-2）was the most suitable one for the accumulation of soil nutrients,being the best for the replanting alterations of Betula platyphylla low-quality forest in Daxing’an Mountains.