Variation of forest reserves in China based on national inventory of forest resources | 基于森林资源清查结果估算我国森林蓄积量变化

chinois. 估算我国7大地区森林蓄积量的变化，探讨未来我国森林保护重点工程实施的具体地区和规划方向。根据1975-2005年的7次全国森林资源清查数据，结合2010年颁布的《全国林地保护利用规划(2010-2020)》，按照自然区将我国划分为东北、华北、西北、西南、华南、华东和华中7个地区，初步核算了2005-2020年各区域森林面积和森林蓄积量的年平均增长率，并评估不同区域之间森林面积和蓄积量增长潜力的差异。森林面积增长量表现为西南＞西北＞华北＞华南＞东北＞华中＞华东，森林蓄积量增量以西南＞东北＞华_北＞_华南＞华中＞西北＞华东；我国森林蓄积量增长潜力呈东南部增长快但总量少、西部增长缓慢但总量多的趋势；2005-2020年全国森林面积共增加4 165.91万hm2，蓄积量增加16.42亿m3，相当于吸收CO2 30.05亿t，其中西南和华南地区吸收量占总吸收量的60%。我国森林的未来规划方向趋向于西部重种植面积、东部重森林质量。

anglais. The study was to calculate variation of forest reserves in 7 regions in China to explore future specific practical ranges and planning guidelines of China forest protection projects. According to data from 7 reports of the National Forest Assessment between 1975-2005 and National Forestland Utilization Protection Planning for 2010-2020, the paper divided forest lands into 7 regions, consisting of Northeast (NE), North China (N), Northwest (NW), Southwest (SW), South China (S), East China (E), and Central China (C). The variation and growth rates of forestland areas and forest reserves in these regions from 2005 to 2020 were calculated. The increasing potential of forestland areas between 7 regions was in order of SW＞NW＞N＞S＞NE＞C＞E and growth of forest reserve was SW＞NE＞N＞S＞C＞NW＞E. There is an obvious variation trend of national forest reserves. Southeast area had high growth rates but with low increment while West area had reversed changing trend. National forestland areas totally increased by 41.659 1 million hectares and forest reserves increased by 1.642 billion m3, which was equal to 3.005 billion tons absorbed CO2 accordingly. Southwest and South China accounted for 60% of absorbed CO2. In future, the national forest planning should be directed to boost huge planting area in the west and keep high quality in the east.