中国生态农业学报2017，Vol.25Issue(4)：542-552,11.DOI:10.13930/j.cnki.cjea.160688
长期施肥下褐土易氧化有机碳及有机碳库的变化特征
Characteristics of readily oxidizable organic carbon and soil organic carbon pool under long-term fertilization in cinnamon soils
摘要
Abstract
The effects of 24 years of long-term fertilization on total organic carbon (TOC), total organic carbon storage (TOCs), net carbon sequestration efficiency (NCSE) and carbon pool management index (CPMI) of cinnamon soils were analyzed in order to provide theoretical basis for the evaluation of soil carbon pool change and quality, and to guide scientific application mode of fertilizers in cinnamon soils. Using data from long-term experiment on soil fertility and fertilizer use history, TOC and ROOC (readily oxidizable organic carbon) contents were analyzed and the relative indexes for TOCS, NCSE and CPMI were calculated for 9 different treatment conditions. The treatments included Group A [no fertilization treatment (N0P0, CK)], Group B [single application of inorganic fertilizer treatments (N1P1, N2P2, N3P3 and N4P4)], Group C [mixed organic and inorganic fertilizers treatments (N2P1M1, N3P2M3and N4P2M2)] and Group D [single application of high amount of organic fertilizer treatment (M6)]. Results showed that the application of medium and high organic manure (N3P2M3 and N4P2M2) increased the contents of TOC and ROOC in different soil layers and in different periods, but the promotion effect decreased with increasing soil depth. TOCS, NCSE and TOC had similar trends in both time and space. TOCS increased with increasing application of organic fertilizer (Group C, Group D), with 76.77% and 17.36% lower for average of Group A and Group B than that for Group C and Group D, respectively. Long-term fertilization improved net carbon fixation efficiency and the application of organic fertilizer significantly improved NCSE. NCSE decreased in the order of Group D > Group C > Group A > Group B. NCSE for Group D was 1152.27 kg·hm﹣2·a﹣1, which was 2.51 times that of Group C, and 16.20 times that of Group B. Compared with CMPI before the experiment, there was no significant difference in CPMIs of Group C and Group D; while CPMIs of Group A and Group B decreased by 16.38﹣40.02. Also compared with control, the application of low-level inorganic fertilizer treatment (N1P1) and application of organic fertilizer of Group C and Group D significantly increased CPMI by 23.30﹣45.67. There was a significant positive correlation between CPMI and ROOC in the 0﹣40 cm soil layer, which implied that CPMI was a good indicator for organic carbon change. As noted, the application of high amount of organic manure or high amounts of organic and inorganic fertilizers (N3P2M3 and N4P2M2) significantly improved soil TOCS, NCSE and CPMI. In other words, application of high amounts of organic fertilizer increased organic carbon sequestration, decreased the application of inorganic fertilizer and enhanced better soil development and soil fertility.关键词
长期施肥/有机肥/有机碳储量/碳库管理指数/净固碳效率/土壤有机碳/易氧化有机碳Key words
Long-term fertilization/Organic fertilizer/Total organic carbon storage/Carbon pool management index/Net carbon sequestration efficiency/Soil total organic carbon/Oxdizible organic carbon分类
农业科学引用本文复制引用
史康婕,周怀平,杨振兴,解文艳,程曼..长期施肥下褐土易氧化有机碳及有机碳库的变化特征[J].中国生态农业学报,2017,25(4):542-552,11.基金项目
农业部公益性行业(农业)科研专项(201203030-08-03)和山西省科技攻关项目(20150311016-1)资助 The study was supported by the Special Fund for Agro-scientific Research in the Public Interest of China (201203030-08-03) and Shanxi Province Science and Technology Research Project (20150311016-1). （农业）
