尖峰岭热带森林土壤C储量和CO_2排放量的初步研究

A PRELIMINARY RESEARCH ON THE CARBON STORAGE AND CO2 RELEASE OF THE TROPICAL FOREST SOILS IN JIANFENGLING, HAINAN ISLAND,CHINA

本文根据定位观测数据和有关历史资料，研究了海南岛尖峰岭林区主要森林土壤的有机Ｃ储量、热带山地雨林和半落叶季雨林凋落物的Ｃ储量和林地ＣＯ２的排放量、以及“刀耕火种”和砍伐森林等人类活动对土壤Ｃ的影响，对于进一步认识热带林的生态功能，弄清我国温室气体的排放量，正确评价中国森林在全球生物圈Ｃ平衡中的作用，具有一定的参考价值。

Based on the data of located observation in Jianfengling,Hainan Island,China,the following aspects were investigated:the carbon storage of the main tropical forest soils;the release of CO2 from the soils and litter layers under tropical mountain rain forest and tropical semideciduous monsoon forest;the effect of slashandburn agriculture on the content of soil carbon and the release of CO2 from soil;and the effect of clearcutting on the soil carbon storage.The results show that the carbon storage of the main tropical forest soils in Jianfengling was from 9710t·hm-2 to 11954t·hm-2,and,in average 10260t·hm-2;in tropical mountain rain forest,the storage of carbon in litter layer was 298t·hm-2,and CO2 was released at a rate of 3316t·hm-2·a-1 from the forest land,of which 2989t·hm-2·a-1 from soil,327t·hm-2·a-1 from litter layer;in tropical semideciduous monsoon forest,CO2 is released with a rate of 1050t·hm-2·a-1 from the forest land.The effect of slashandburn agriculture on soil carbon was observed even at the depth of 60 cm below soil surface,the release of CO2 from the land under the activity of slashandburn agriculture was 379%,higher than that from the land covered with tropical semideciduous monsoon forest.The results also show that clearcutting caused the decrease in the carbon storage of the forest soil and natural regeneration made the carbon storage recovered.