紫色土人工林生态系统碳库与碳吸存变化

Changes of carbon storage and carbon sequestration in plantation ecosystems on purple soil.

采用时空代换法 ,以福建省宁化县严重退化紫色土人工林生态系统为对象 ,按侵蚀强度由强到弱选取 4种生态恢复措施Ⅰ、Ⅱ、Ⅲ、Ⅳ ,对比研究了碳库与碳吸存能力 .结果表明 ,随着恢复程度的提高 ,生态系统的碳吸存能力逐渐增加 ,即Ⅰ <Ⅱ <Ⅲ <Ⅳ ,4种措施生态系统碳库分别为 1 4、8 5、2 5 6和 37 6t·hm-2 ;CO2 年同化量分别是 712 87、14 5 8 0 1、9718 10和 1110 9 5 6kg·hm-2 .可见 ,恢复过程中的生态系统是本地区重要的碳汇之一 .水土保持工程措施与生物措施相结合应是退化生态系统生态恢复的重要手段 ,但是减少人为干扰才是目前较为合理的恢复策略 ,使森林生态系统成为大气中CO2 的一个重要的碳汇 .

This paper studied the carbon storages and carbon sequestration capacities of degraded plantation ecosystems in purple soil area.Using space-time replacement method,four ecological restoration treatments (Ⅰ,Ⅱ,Ⅲ and Ⅳ) were selected on the basis of erosion intensions from high to low in Ninghua,Fujian.Treatment Ⅰ was not treated with any other measures after afforestation.Treatment Ⅱ adopted engineering soil and water conservation measure after afforestation.In treatment Ⅲ,the engineering measure associated biological measure was taken after afforestation.As for treatment Ⅳ,enclosure was adopted to protect against anthropogenic disturbances after afforestation.We observed that the carbon sequestration potential was increased with weakening erosion degree,i.e.,Ⅰ<Ⅱ<Ⅲ<Ⅳ.The carbon storage of 4 treatments was 1.4,8.5,25.6 and 37.6 t·hm -2,and the annual assimilation of CO 2 was 712.87,1458.01,9718.10 and 11109.56 kg·hm -2,respectively.It was suggested that the restored forest ecosystem was one of the important carbon sinks in this area.Engineering soil and water conservation measure associated biological measure would be the main means of restoring degraded ecosystem.But presently,the reasonable strategy was to decrease human's disturbances,and hence,the enclosure for reforestation could be used to transform forest ecosystem into carbon sink.