森林火灾迹地自然恢复与人工林林分结构及效应研究

The natural recovery of the forest fire vestige,afforestation and its effect

对桂西北地区森林火灾迹地自然抛荒恢复与人工林林分结构及效应研究结果表明，随经营年限的增加，5种人工造林经营模式年均土壤有机质增加2．50％～4．08％，全N增加11．80％～43．64％，全P增加2．33％～19．95％，全K增加17．73％～44．33％；生物量最高为人工油茶（平均87791kg／hm^2），其次为人工桉树（70799kg／hm^2）；而生产力最高为人工木荷（36965kg／hm^2），其次为人工油茶（32746kg／hm^2）；水土保持效应最佳为人工竹林和人工油茶，其次为人工木荷、人工马尾松和人工桉树。

The natural recovery of the forest fire vestige and the afforestation and its effect in Northwest of Guangxi were studied. The results express that with the increment of the operating time, the soil organic matter is averagely increased by 2.50% -4.08%, total N by 11.80% -43.64%, total P by - 2.33% -19.95%, total K by 17.73% --44.33% ; the blomass amount of artificial oil tea is the tallest, which attains 87791kg/hm^2, the next is artificial eucalyptus being 70799kg/hm^2 ; the productivity of artificial wood lotus is the tallest being 36965kg/hm^2, the next is artificial oil tea being 32746kg/hm^2. The water and soil conservation effect of artificial bamboo and artificial oil tea is the best, the next is artificial wood lotus, artificial horsetail and artificial eucalyptus.