期刊论文

Zhang, Y.Z.

中文

生态学报

1000-0933

2014

34

23

7004-7012

10.5846/stxb201310312630

国家自然科学基金项目(31100381) 湖南省自然科学基金项目(13JJ4066) 湖南农业大学***项目(11YJ20)

本校为第一且通讯机构

通过对中亚热带丘陵山区4种典型的土地利用方式(天然林以及由此转变而来的杉木人工林、板栗园和坡耕地)1 m深土壤剖面碳储量、δ~(13)C值和细根生物量的研究,结果表明:土地利用变化7a后,土壤剖面(1 m)有机碳储量与天然林相比降低了26%-36%,且40 cm以下深层矿质土壤碳储量下降了19%- 45%。1 m深土壤δ~(13)C平均则升高1‰3‰,说明植物群落的光合类型发生了变化,C_4植物种对土壤有机碳的贡献增加。天然林转变后,严重的水土流失、人为扰动和植物物种组成的变化,诱发深层土壤碳输入减少以及碳流失和矿化损失增加,是导致深层土壤碳储量大幅下降的主因。土地利用变化后,60 cm深细根生物量锐减50%-99%,...

Soil is a major terrestrial carbon pool and most of the soil carbon is stored in the deep soil layers, which contributes to more than half of the total soil carbon storage. Compared with the topsoil carbon storage, carbon reserved in deep soil depth may respond differently to environmental change and land management practices. Thus, it needs to consider the deep soil organic carbon storage in the global carbon cycles. In the subtropical hilly region of China, some soils are deeply weathered and have highly developed profile. These deeply weathe...