两广地区主要森林类型的年土壤呼吸及空间分布研究

研究根据广东和广西(两广)地区森林类型分布图、主要森林类型的年土壤呼吸数据库以及中国日值格点气温、降水数据,建立线性模型预测两广地区主要森林类型的年土壤呼吸速率和年土壤呼吸通量。结果表明,两广地区主要森林类型年土壤呼吸速率为常绿阔叶林864.18 gC/m~2/yr>其他森林811.03 gC/m~2/yr>针叶林791.43 gC/m~2/yr>灌木林780.18 gC/m~2/yr>落叶阔叶林758.80 gC/m~2/yr>竹林731.49 gC/m~2/yr>针阔混交林684.91 gC/m~2/yr。两广地区森林年土壤呼吸通量为204.41 TgC/yr,其中常绿阔叶林最大,为77.41 TgC/yr,针叶林次之,为56.81 TgC/yr,具体为常绿阔叶林>针叶林>灌木林>落叶阔叶林>针阔混交林>竹林>其他森林,顺序与各种森林类型面积大小一致。各森林类型的土壤呼吸通量主要与森林面积有关,森林面积越大土壤呼吸通量越大。

Annual Soil Respiration and Spatial Distribution of Major Forest Types in Guangdong and Guangxi Regions

In this study,a linear model was established to predict the annual soil respiration rate and annual soil respiration flux of major forest types in Guangdong and Guangxi regions,which based on the distribution map of forest types,the annual soil respiration database of major forest types and the temperature and precipitation data of daily grid points in China.The result showed that the annual soil respiration rate of the main forest types was evergreen broad-leaved forest(864.18 gC/m2/yr)>other forest(811.03 gC/m2/yr)>coniferous forest(791.43 gC/m2/yr)>shrubbery lands(780.18 gC/m2/yr)>deciduous broad-leaved forest(758.80 gC/m2/yr)>bamboo grove(731.49 gC/m2/yr)>mixed coniferous and broad-leaved forest(684.91 gC/m2/yr).The annual soil respiration flux of the forests in Guangdong and Guangxi was estimated to be 204.41 TgC/yr,among which the maximum was 77.41 TgC/yr for evergreen broad-leaved forest,followed by coniferous forest 56.81 TgC/yr.Specifically,evergreen broad-leaved forest>coniferous forest>shrubbery lands>deciduous broad-leaved forest>mixed coniferous and broad-leaved forest>bamboo grove>other forests,the order is consistent with the area size of various forest types.Therefore,the soil respiration flux of each forest type is mainly related to the forest area,and the larger the forest area,the greater the soil respiration flux.