生态与农村环境学报2018，Vol.34Issue(3)：240-246,7.DOI:10.11934/j.issn.1673-4831.2018.03.007
耕作年限对鄱阳湖围垦区稻田土壤有机碳组分的影响
Effects of Tillage Years on Soil Organic Carbon Fractions in the Poyang Lake Reclaimed Paddy Fields
摘要
Abstract
Wetland conversion to paddy field is a typical land use change in the middle and lower reaches of the Yangtze River. Poyang Lake is the largest fresh water lake in China. There were total 1 466.9 km2Poyang Lake wetlands that were converted to croplands,and most of them were used as paddy cultivation.Soil samples were collected from Poyang Lake re-claimed paddy fields with different tillage years. Subsequently, soil total organic carbon(SOC), heavy fraction organic carbon(HFOC),light fraction organic carbon(LFOC)and microbial biomass carbon(MBC)were measured. The objec-tive was to clarify the effect of tillage years on soil organic carbon fractions in the Poyang Lake reclaimed paddy fields. Re-sults indicate that the top 30 cm soil HFOC and LFOC ranged from 5.89 to 24.01 and 0.47 to 4.14 mg·g-1,respective-ly,whereas MBC varied from 12.43 to 850.53 mg·kg-1. All three organic carbon fractions were significantly positively correlated with soil total organic carbon. HFOC,LFOC and MBC were significantly affected by tillage years. The contents of all three organic carbon fractions increased with tillage years. However,the ratios of various organic carbon fractions to soil total organic carbon differed among the three components and varied with soil depth. After 50 years tillage, HFOC in the reclaimed paddy fields was relatively stable,however,the ratio of HFOC to SOC declined in comparison to natural wet-lands. Hence,to some extent,reclamation declined the stability of soil carbon pool.关键词
鄱阳湖/围垦稻田/耕作年限/有机碳组分Key words
Poyang Lake/reclaimed paddy field/tillage year/soil organic carbon fraction分类
农业科技引用本文复制引用
胡佳,吴琴,陈正兴,崔浩,胡启武..耕作年限对鄱阳湖围垦区稻田土壤有机碳组分的影响[J].生态与农村环境学报,2018,34(3):240-246,7.基金项目
国家自然科学基金(31600371) （31600371）
江西省教育厅科学基金(GJJ150336) （GJJ150336）
