The potential of cropping systems and soil amendments for carbon sequestration in soils under long‐term experiments in subtropical India

作者：Biswapati Mandal, Bidisha Majumder, P. Bandyopadhyay, G. C. Hazra, A. Gangopadhyay, R. N. Samantaray, Abinash Mishra, J. Chaudhury, Madhumonti Saha, S. Kundu · 发表于：Global Change Biology · 年份：2006 · DOI：10.1111/j.1365-2486.2006.01309.x · 被引用次数：274 · 研究领域：Soil Carbon and Nitrogen Dynamics、Rice Cultivation and Yield Improvement

Abstract An understanding of the dynamics of carbon (C) stock in soils, as impacted by management strategies, is necessary to identify the pathways of C sequestration in soils and for maintaining soil organic C (SOC) at a level critical for upkeeping soil health and also for restraining global warming. This is more important in tropical and subtropical region where soils are inherently low in organic C content and the production system is fragile. We evaluated the long‐term role of crop residue C inputs to soil in SOC sequestration and also the critical value of C inputs for maintenance of SOC across five different rice‐based cropping systems and four soil management practices including a fallow (no cultivation since initiation of the experiments) using five long‐term (7–36 years) fertility experiments in subtropical India. Croppingper sealways caused a net depletion of SOC. Such depletion was inversely proportional to the amount of crop residue C incorporated into the soils (r=−0.92,P=0.001). Balanced fertilization with NPK, however, caused an enrichment (9.3–51.8% over the control) of SOC, its extent being influenced by the cropping systems. Long‐term application of organic amendments (5–10 Mg ha−1 yr−1) through farmyard manure (FYM) or compost could increase SOC hardly by 10.7% constituting only 18% of the applied C, the rest getting lost through oxidation. The total quantity of soil C sequestered varied from −11.5 to 14.5 Mg C ha−1and was linearly related (r2=0.40,P=0.005...