摘要
基于河南省长期定位试验2006—2016年试验数据,分析免耕对土壤碳储量、有机碳(SOC)平均年变化量和有机碳相对年变化量的影响,并依据2015与2016两年试验数据研究免耕条件下SOC和可溶性有机碳(DOC)在0~100 cm土层的分布特征及cDOC/cSOC随土壤深度的变化趋势。研究结果表明,免耕较传统耕作显著提高了土壤有机碳储量、平均年变化量和相对年变化量。与传统耕作相比,免耕在冬小麦拔节期和成熟期分别提高土壤0~100 cm土层平均DOC含量4.2%和26.9%。免耕在冬小麦拔节期、灌浆期和收获期较传统耕作降低土层0~40 cm DOC含量,而40~100 cm土层平均DOC含量由于不同年份、不同生育期降雨量和冬小麦生物量不同而表现不尽相同。与传统耕作相比,免耕处理cDOC/cSOC在土层20~40,60~80和80~100 cm显著降低,表明免耕有利于土壤碳库稳定。
Based on a long-term field experiment from 2006 to 2016,in this work,the impact of the no-tillage treatment on the total soil carbon storage,annual variation,and relative annual variation of soil organic carbon(SOC)has been systematically analyzed.Meanwhile,the distribution characteristics of the dissolved organic carbon(DOC)and the variation of cDOC/cSOC with the soil depth of 100 cm were also examined by the experimental data from 2015 to 2016.Our results show that compared with the conventional tillage,no-tillage significantly increased the soil carbon storage,mean annual variation,and relative annual variation of SOC.The mean DOC content within topsoil profile(100 cm)was increased by 4.2%and 26.9%,respectively,at the jointing and harvest stages of winter wheat under no-tillage.The mean DOC content within 40 cm depth of topsoil was found to be declined at jointing,filling,and harvest stages of winter wheat under no-tillage,whereas the mean DOC content of the soil profile at depth from 40 to 100 cm was different with wheat growth stages and growing seasons due to different precipitation and winter wheat biomass.The ratio of cDOC/cSOC at the soil depth from 20 to 40 cm,from 60 to 80 cm,and from 80 to 100 cm was significantly decreased under no-tillage,suggesting that no-tillage could make substantial contributions to the stability of soil carbon pool.
作者
丁晋利
武继承
杨永辉
高翠民
DING Jin-li;WU Ji-cheng;YANG Yong-hui;GAO Cui-min(School of Geography and Tourism, Zhengzhou Normal University, Zhengzhou 450044, China;Institute of Plant Nutrition and Resource & Environmental Science, Henan Academy of Agricultural Sciences, Zhengzhou 450002, China;Yuanyang Experimental Station of Crop Water Use, Ministry of Agriculture, Yuanyang 453514, China)
出处
《湖南师范大学自然科学学报》
CAS
北大核心
2020年第3期27-31,共5页
Journal of Natural Science of Hunan Normal University
基金
国家重点研发计划资助项目(2017YFD0301102)
国家高技术研究发展计划资助项目(863计划)(2013AA102904)。
