秦岭南坡油松次生林抚育效果评价

Synthetical evaluation of thinning effects for Pinus tabuliformis secondary forest on south slope of Qinling Mountains

通过对抚育4 a后的油松次生林现状调查,在全面分析抚育对其林分结构、林分生产力、水源涵养及林下植被多样性影响的基础上,运用主客观组合赋权法对秦岭油松次生林抚育效果进行评价,筛选出混交度、林分生物量、枯落物现存量和灌木Shannon-Wiener指数4个影响评价效果的主导因子。结果表明:调查的36个抚育样地中,无不健康样地;22%的样地处于亚健康状态;67%的样地处于健康状态;11%的样地处于优质状态。通过分析主导因子得出:提高混交度是促进秦岭油松次生林健康发育的必要手段;油松次生林的抚育强度不宜过大;对油松次生林的经营中不宜采用砍灌这一经营手段。

Based on overall analyses of stand structure, productivity, water conservation and species diversity of vegetation of Pinu~ tabuliformis secondary forest after 4 years of thinning, the method of objective and subjective combination weighting was carried out to evaluate the thinning effects on P. tabuliformis secondary forest on south slope of Qinling Mountains, and the mingling degree, biomass,litter storages and Shannon-Wiener index of shrub were screened out as dominant factors. The results showed that among the 36 sampling plots, none of them was unhealthy, 22% of the plots were in sub-health state, while 67% of the plots were in healthy state, moreover, 11% of the plots showed high quality. According to analyses of the dominant factors, we concluded that increasing the mingling degree was the necessary means for promoting development of P. tabuliformis secondary forest. The thinning intensity of P. tabuliformis secondary forest should not be too heavy. Elimina- ting shrub was also not available in the management of P. tabuliformis secondary forest.