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Chemical Composition of Plant Residues Regulates Soil Organic Carbon Turnover in Typical Soils with Contrasting Textures in Northeast China Plain

文献类型： 外文期刊

作者： Liu, Siyi 1 ; Li, Jiangye 4 ; Liang, Aizhen 1 ; Duan, Yan 7 ; Chen, Haibin 2 ; Yu, Zhuyun 6 ; Fan, Ruqin 2 ; Liu, Haiyang 8 ; Pan, Hong 9 ;

作者机构： 1.Chinese Acad Sci, Northeast Inst Geog & Agroecol, Changchun 130102, Peoples R China

2.Zhongkai Univ Agr & Engn, Coll Resources & Environm, Guangzhou 510225, Peoples R China

3.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Urban & Reg Ecol, Beijing 100085, Peoples R China

4.Jiangsu Acad Agr Sci, Inst Agr Resources & Environm, Nanjing 210014, Peoples R China

5.China Minist Agr Key Lab Yangtze River Plain Agr, Nanjing 210014, Peoples R China

6.Hengshui Univ, Hebei Prov Key Lab Wetland Ecol & Conservat, Hengshui 053000, Peoples R China

7.Chinese Acad Sci, Hefei Inst Phys Sci, Hefei 230031, Peoples R China

8.Henan Agr Univ, Coll Resources & Environm, Zhengzhou 450002, Peoples R China

9.Shandong Agr Univ, Coll Resources & Environm, Tai An 271018, Shandong, Peoples R China

关键词： CO2 emission; crop residues chemistry; soil textures; soil organic carbon

期刊名称：AGRONOMY-BASEL （ 影响因子：3.949； 五年影响因子：4.117 ）

ISSN：

年卷期： 2022 年 12 卷 3 期

页码：

收录情况： SCI

摘要： Soil organic carbon (SOC) turnover plays a pivotal role in achieving C neutrality, promoting C retention and increasing soil fertility. Residue biochemistry and soil texture essentially determine SOC distribution (including CO2 mineralization and stock in soil) in farmland. However, less is known about allocation of residue-C with contrasting biochemistry and the fate of residue-C in soil under two different textures. This study was conducted in a 61-day aerobic incubation with two Black soils with distinct texture (clay loam vs. sandy loam) in Northeast China. Chemical composition of seven residue parts (soybean roots, leaves, and stems and maize roots, leaves and top and bottom stem parts) was characterized using solid-state 13C nuclear magnetic resonance spectroscopy. The results showed that leaves of both two crops contained significantly higher nitrogen (N), carbonyl and aryl concentrations and lower carbon (C) and lignin concentrations than other parts, resulted in faster decomposition in soils, especially in the clay loam. Stems contained higher O-alkyl and di-O-alkyl concentrations, C/N and lignin/N, while roots contained higher aromaticity. Maize top stem parts with larger slow C pool and longer half-life had higher contribution to SOC accumulation than other parts. Soil textures also induced great impact on SOC turnover. The clay loam favored SOC sequestration due to significantly longer half-life of slow C pool than the sandy loam. Generally, the alkyl/O-alkyl ratio showed the most significant correlation with SOC, CO2 emission and soil biochemical factors in the clay loam; whereas in sandy loam, the lignin/N was the pivotal indicator for SOC accumulation. This study provides insights into the differences in chemical composition among various residue parts, and highlights the significant effects of both residue chemical composition and soil texture on residue decomposition and SOC accumulation.

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