摘要
选择江西泰和红壤退化区25年的自然恢复草地和2种恢复林地,测定了土壤团聚体有机碳的δ13 C,探讨了森林恢复过程有机碳在团聚体中的分配和周转特征。结果表明:3种植被恢复模式土壤大团聚比例最高,微团聚体比例最低,木荷林0-20cm土层大团聚体比例平均值高于马尾松林和草地;木荷林表层土各粒径团聚体有机碳含量均显著高于草地,表层土粉黏粒(<53μm)有机碳含量最高,其有机碳δ13 C最低;草地表层土团聚体中有机碳δ13 C值比全土降低幅度最大,阔叶林中居中;3种植被恢复模式下土壤大团聚体总有机碳储量最大,其次是粉黏粒,最小的是微团聚体,来自人工林的新碳主要分布在土壤表层大团聚体中;马尾松林和木荷林表层土团聚体中有机碳的周转时间为41～53年,低于10-20cm土层,2种林分粉黏粒中有机碳的周转时间最短,微团聚体中有机碳周转时间最长。研究表明以常绿阔叶树木荷直接进行植被恢复能够有效提升土壤地力,不仅提高了全土中的有机碳含量,也增加了团聚体中的有机碳含量;而以先锋树种马尾松进行的植被恢复效果弱于木荷林,应当采取一定营林措施促进马尾松林的恢复效果。
In this study,two stands and natural grassland were selected in Taihe Red soil degraded area of Jiangxi Province to research the distributions and turnover characteristics of organic carbon in soil aggregates.The results showed that the proportion of macroagrregates was the largest and that of microaggregates was the lowest.The content of organic carbon of all aggregates was higher in the Schima plantation than that of the grassland.The organic carbon in soil silt (< 53 μm) was the highest.The δ^13C value of soil aggregate in the surface soil had the highest decrease in grassland compared with the original soil,and moderate in broad-leaved forest.The turnover time of soil organic carbonin surface layer in coniferous forest was 41 ~ 53 years,lower than that in 10-20 cm soil layer.The turnover time of organic carbon in the clay particle of the two plantation was the shortest and that in the macroaggregate was the longest.The results also showed that vegetation restoration from evergreen broad-leaved Schima superba in the red soil region could effectively enhance soil fertility thus not only increasing the organic carbon content in the original soil,but also increasing the organic carbon content in the aggregate.However,the vegetation restoration effect of Pinu smassoniana plantationwas weaker than that of broad-leaved forest.So some measures should be taken to promote the restoration of coniferous forest.
作者
李燕燕
刘亮英
张志坚
吴春生
刘苑秋
樊后保
LI Yanyan;LIU Liangying;ZHANG Zhijian;WU Chunsheng;LIU Yuanqiu;FAN Houbao(College of Landscape and Art,Jiangxi Agricultural University,Nanchang 330045;Institute of Ecology and Environmental Sciences,Nanchang Institute of Technology,Nanchang 330099;Yichun City Forestry Research Institute,Yichun,Jiangxi 336000)
出处
《水土保持学报》
CSCD
北大核心
2019年第1期80-85,共6页
Journal of Soil and Water Conservation
基金
江西省科技厅青年基金项目(20171BAB214007)
江西省教育厅科技项目(GJJ170977)
赣鄱英才"555"工程领军人才培养计划项目
关键词
植被恢复
人工林
有机碳周转
红壤退化草地
vegetation restoration
plantation
organic carbon turnover
red soil degraded grassland
