慈利县森林资源消长动态变化分析

The dynamic change analysis of forest resources in Cili Country

利用慈利县最近二期的森林资源二类调查结果,从森林面积、林木蓄积、龄组结构、树种组成和林种结构等5个方面进行对比调查。结果显示:慈利县2013年林地面积246 530 hm2,森林覆盖率64.96%,林木绿化率66.48%,较2004年分别增加了5.79%和5.66%,林木蓄积6.47×106m3,增加了37.96%,特别是乔木林蓄积增加明显,达到了41.53%,目前慈利县存在的乔木林以中龄林、近熟林和成熟林为主,也是蓄积增加明显的龄组林,而幼龄林和过熟林面积和蓄积都有所降低,纯林面积减少,混交林面积大幅度增加,虽然混交林蓄积低于纯林蓄积,但是混交林蓄积增幅明显。慈利县森林林种结构以特种用途林和用材林为主,公益林地面积变化不大,商品林地面积变化较大。

Based on the two recent results of second category investigations of forest resources in Cili County,and com-pared in main five aspects,including forest area,standing crops,forest age structure,forest category structure,and spe-cies composition.The results showed that forest land area of Cili County is 246 530 hm2 in 2013,the forest coverage rate is 64.96%,forest green rate is 66.48% and forest reserves 6.47 ×106 m3 ,compared to 2004 it increased by 5.79%, 5.66% and 37.96% respectively.Especially in the tree stand volume increased significantly and reaching 41.53%.In present,the trees construction in the forest in Cili County are near mature forest and mature forest,forest age group is ac-cumulation increased significantly,while the young forest and mature forest area and volume are reduced.The area of pure forest is reduced and mixed forest area are increased greatly.Although the volume of mixed forest was lower than it of pure forest,but its volume rate was increased significantly.Cili county forest category structure based on the special use forest and timber forest,and there is a little change in public forest area,but obvious change in commercial forest area.