摘要
建立宜昌近20年来森林景观时空动态变化的指标体系。在时间上,宜昌森林景观的森林覆盖率、林地利用率、森林蓄积量大幅度增加,然而森林演替缓慢、林龄结构不合理;在空间分布上,通过回归模型的多期拟合分析,森林景观生物量随海拔、坡度、坡位变化明显,并且出现生物量峰值有规律的转移,而出现的不规律变化多是林业外部条件突变引起的。
A dynamic indices system on the later twenty years landscape planted in the last 20 years in of Yichang City was established.It was discovered that forest coverage,utilization percent and volume are increasing by large range,but with slow succession and a steep age class.Also the forest landscape changed visibly based on the varying of altitude,grade and position.The peak value of productivity keeps to a transferring law.However the forest exterior condition shows disorder.
出处
《湖南林业科技》
2003年第4期35-38,共4页
Hunan Forestry Science & Technology
基金
国家林业局"十五"科技推广项目 (2 0 0 1天保 5号 )。
