摘要
为探究亚热带红壤区不同植被恢复类型对土壤有机碳周转的影响,本研究以自然恢复草地、马尾松林和木荷林为研究对象,测定植被和土壤有机碳的δ13C,探讨不同林分类型对土壤有机碳来源的影响。结果表明,自然恢复草地植被以C4植物为主,退化草地转变为马尾松林和木荷林后,植被类型以C3植物为主。2种林分从凋落物δ13C到表层土壤有机碳δ13C增加幅度超出了正常的增加范围,显示两个林地有机碳来源为原有草地和当前恢复林分的混合物,表层土壤来源于恢复林分的有机碳低于来源于原有草地的有机碳;2个林分土壤有机碳δ13C均随着深度增加而不断增大。木荷林土壤有机碳的分解速率低于马尾松林,木荷林中土壤有机碳存留时间高于马尾松林。综上所述,尽管马尾松林土壤有机碳来源于新碳的比例高于木荷林,但木荷林中土壤有机碳分解更慢,因此对马尾松林和木荷林土壤的固碳过程需要更加深入的研究。本研究为退化红壤区植被恢复树种的选择提供了理论依据,丰富了南方退化红壤区植被恢复林土壤有机碳研究。
To explore effect of different vegetation restoration types on soil organic carbon turnover in degraded red soil,δ13C of vegetation and soil organic carbon were analyzed in the natural restoration grassland,Pinus massoniana forest and Schima superba forest.The results showed that C4 plants were dominated in the natural restoration grassland,while C3 plant mainly occurred in the Pinus massoniana and Schima superba forest.Theδ13C increase of soil organic carbon from litter to soil was beyond the normal range from current research in both stands,indicating that sources of soil organic carbon were the mixture of the pasture and the currently restored forest.Soil organic carbon from the surface soil was lower than that from the original grass carbon.Theδ13C of soil organic carbon increased with the depth in both stands.The decomposition rate of soil organic carbon in the Schima superba forest was lower than that of soil in the Pinus massoniana forest,but the retention time of SOC was the opposite in two forests.Although the proportion of soil organic carbon from new carbon in the Pinus massoniana forest was higher than that in Schima superba forest,the soil organic carbon decomposes more solwly in muhe forests.In the long run,the carbon sequestration process of Pinus massoniana and Schima superba soils needs more reasonable evaluation.This study provides a theoretical basis for the selection of tree species for vegetation restoration and enriches the research for soil organic carbon of vegetation restoration in degenerated red soil regions.
作者
李燕燕
刘亮英
吴春生
丘满园
刘苑秋
LI Yanyan;LIU Liangying;WU Chunsheng;QIU Manyuan;LIU Yuanqiu(College of Landscape and Art,Jiangxi Agricultural University,Nanchang,Jiangxi 330045;School of Hydraulic and Ecological Engineering,Nanchang Institute of Technology,Nanchang,Jiangxi 330099)
出处
《核农学报》
CAS
CSCD
北大核心
2020年第11期2561-2568,共8页
Journal of Nuclear Agricultural Sciences
基金
江西省教育厅科技项目(GJJ170977)
江西省科技厅青年基金项目(20171BAB214007)
江西农业大学研究生创新专项资金项目(NDYC2015-B001)。
关键词
植被恢复
土壤有机碳
碳同位素
周转
vegetation restoration
soil organic carbon
carbon isotope
turnover
