中国生态农业学报2017，Vol.25Issue(11)：1580-1590,11.DOI:10.13930/j.cnki.cjea.170263
滨海盐渍区不同土地利用方式土壤-植被系统碳储量研究
Carbon storage of soil-vegetation system under different land use patterns in saline coastal regions
摘要
Abstract
Research on the coupling relationship between land use change and carbon sequestration potential in soil-vegetation systems in saline coastal plains has been of great theoretical and practical significance in terms of optimizing the implementa-tion of land use with the purpose of vegetation restoration and enhancing carbon sink. This study used an abandoned bare sa-line-alkali land as the control to determine the dynamic changes in carbon storage in soil-vegetation systems under 3 years and 10 years old Tamarix chinensis plantations, 2 years and 8 years old Lycium chinense plantations, and frozen saline water irri-gated cotton field with plastic mulching, and cotton field only mulched with plastic film. Based on continuous observation and quantitative description, we discussed carbon sequestration potential of soil-vegetation systems under the land use patterns and provided theoretical basis for increased regional carbon storage. The results were as follows: 1) T. chinensis and L. chinense plantations and cotton cultivation with frozen saline water irrigation and plastic mulching significantly increased soil organic carbon content and reduced soil bulk density. T. chinensis planted for 10 years and L. chinense planted for 8 years had the highest carbon storage, 118.24 t·hm-2 and 96.27 t·hm-2, which recorded carbon storage increases of 58.51 t·hm-2 and 36.54 t·hm-2 respectively over cotton fields under frozen saline water irrigation with plastic mulching treatment. It also increased by 83.39 t·hm-2 and 61.42 t·hm-2 respectively over abandoned bare saline-alkali lands. 2) T. chinensis planted for 3 years and L. chinense planted for 2 years had the highest carbon sequestration rate, which was respectively 10.08 t·hm-2·a-1 and 2.71 t·hm-2·a-1. The rate of carbon sequestration was lowest (0.53 t·hm-2·a-1) for cotton field under frozen saline water irrigation with plastic mulching. T. chinensis planted for 10 years and L. chinense planted for 8 years had the weakest performance as carbon source and needed increased carbon storage by land use change or vegetation regeneration. The carbon storage of cot-ton field only with plastic film mulching decreased 0.86 t·hm-2 per year due to remove of cotton straw. The abandoned bare saline-alkali land was a carbon source because not exogenous carbon input, whose carbon storage decreased 1.42 t·hm-2 per year. By comparing the advantages and disadvantage of each land use type, T. chinensis and L. chinense cultivation was the most efficient way of increasing regional carbon storage in saline coastal regions.关键词
滨海盐渍区/土壤有机碳/植被生物量/土地利用方式/咸水结冰灌溉Key words
Saline coastal region/Soil organic carbon/Vegetation biomass/Land use change/Frozen saline water irrigation分类
农业科学引用本文复制引用
李晓光,郭凯,封晓辉,刘小京..滨海盐渍区不同土地利用方式土壤-植被系统碳储量研究[J].中国生态农业学报,2017,25(11):1580-1590,11.基金项目
国家科技支撑计划项目(2013BAD05B02, 2013BAD05B05)和中国科学院科技服务网络计划(KFJ-SW- STS-141-04-1)资助 This study was supported by the National Key Technology R&D Program of China (2013BAD05B02, 2013BAD05B05) and the Science and Technology Service Network Program of the Chinese Academy of Sciences (KFJ-SW-STS-141-04-1). （2013BAD05B02, 2013BAD05B05）
