杉木混交林近自然经营效果研究

Effectiveness Study on the Close-to-nature Management for Mixed Forest of Chinese Fir

对3种不同树种组成的杉木混交林采用近自然经营方式和常规经营方式,对比分析不同经营方式下林分生长、林内环境及林地土壤理化性质的变化。结果表明,与常规经营方式相比,近自然经营的林分平均树高、平均胸径、平均冠幅、平均枝下高、平均单株材积和平均蓄积量等指标明显高于常规抚育的林分,各项指标分别提高了7.90%、10.20%、7.10%、16.98%、30.91%和26.50%;同时林内灌草植被生长旺盛,林分总生物量增加49.71t·hm-2;林地土壤理化学性质各指标均得到明显改善,表现出较高的保水保肥能力。

Three mixed forests of Chinese fir with different species,which were managed with close-to-nature mode（CNM）and conventional mode（CM）respectively,were selected for the analysis of stand growth,forest environment and forest soil physicochemical property changes.The results indicated that all the stand indicators of forests managed with CNM were higher than those of forests managed with CM,the stand average tree height,average diameter at breast height,average crown width,average height under branch,average individual volume and average volume increased by 7.90%,10.20%,7.10%,16.98%, 30.91%,and 26.50%,respectively.The shrub and grass vegetation showed vigorous growth in the CNM forests,and the total stand biomass increased 49.71t·hm-2.The indicators of forest soil physicochemical properties in CNM forests were significantly improved,which showed a higher ability to conserve water and fertilizer than that of forests managed with CM.