森林对二氧化碳循环的影响

Effects of Forest on Carbondioxide's Cycle

假定安徽地区为封闭系统，用大气中ＣＯ２源汇理论，估算森林固定ＣＯ２的效益及安徽地区大气中ＣＯ２的增量，结果表明：安徽地区以各种途径释放到大气中ＣＯ２总量为１８．４２５×１０７ｔ，其中森林、农作物、荒山、水体的吸收率分别为４０．３２％，４７．６４％，５．９９％，５．２５％。滞留量为０．１５３２×１０７ｔ，ＣＯ２浓度的年增量为０．７８μｇ·ｇ－１，低于世界年平均增量（１．０～１．２μｇ·ｇ－１），若ＣＯ２释放量不变，全省只要在原有森林覆盖率的基础上，营造阔叶林６．９７×１０４ｈｍ２或针叶林９．０３×１０４ｈｍ２。

Assuming Anhui province is a close system,the effects of forest on CO 2 fixation and accumulation were studied.The total amount of CO 2 released in Anhui province is about 18 425×10 7 ton each year.The CO 2 absorbing rates of forest,crops,barren hills and water are 40 3%,47 64%,5 99% and 5 25%,respectively,so there is 1 532×10 6 ton CO 2 accumulated and the annual increasing rate of CO 2 concentration is 0 78μg·g -1 ,which is lower than that of world average increasing rate (1 0～0 2μg·g -1 ).If the CO 2 release kept stable,the balance of circulation of CO 2 and O 2 could be achieved by planting 6 97×10 4 hm 2 broadleaf tree or 9 03×10 4 hm 2 conifer tree.