【摘要】 该文在 3S技术支持下 ,利用中国资源环境数据库中 1985、1995和 2 0 0 0年 3期全国林地空间分布数据 ,通过建立林地资源时空演变模型 ,从时间序列和空间尺度上探讨了 1985— 2 0 0 0年中国林地资源动态变化的时空过程和内在动因 .结果表明 :1985— 2 0 0 0年全国林地面积总量出现较大幅度的波动 ,其中 2 0世纪 90年代前期林地净增加2 2 2 63万hm2 ,主要是由于灌木林和疏林地的增加所导致 ;90年代后期林地总量呈减少的趋势 ,但有林地却净增加84 56万hm2 .全国林地资源的动态变化空间分异明显 ,其中东北大小兴安岭、长白山 ,西南地区以及东南沿海地区以林、草、耕地相互转换为主 ;四川盆地和东南丘陵以林地、耕地相互转换为主 ;华北、黄土高原农牧交错带以林地、草地相互转换为主 .从全国来看 ,90年代林地面积呈现总量减少的趋势 ,减少的林地集中分布于传统林区 ,其中东北地区林地面积净减少最多 ,其次为西南地区 .而在造林区林地面积净增加最多的为东南地区 ,以福建、江西等省份最突出更多还原

【Abstract】 Supported by the land_use/cover data set of National Resources and Environment Database (NRED) in the years of 1985, 1995 and 2000, s patial patterns and temporal variations of woodland resource changes from 1985 to 2000 were studied in the paper. Ac co rding to the woodland dynamic degree model and time series analysis, the authors disclose the spatial pattern and internal causes of woodland changing processe s. It was found that the net increase of woodland amounted to 2 226 3 thousand/ hm 2 during the period of 1985—1995, and from 1995 to 2000 the total area of woodlan d decreased, but the net increase of forest totalled 845 6 thousand hm 2 . O n the other hand, the scope and dept h of woodland change had heterogenous characteristics. During 1985—2000 the tot al woodland area decreased, especially in the traditional forest regions such a s northeast China, southwest China. abstractBut in other regions such as Fujian and Jian gxi Provinces the woodland increased.更多还原