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1980—2011年川东平行岭谷区农田土壤有机碳动态
引用本文:邵景安,惠辽辽,慈恩,谢德体.1980—2011年川东平行岭谷区农田土壤有机碳动态[J].生态学报,2014,34(15):4347-4360.
作者姓名:邵景安  惠辽辽  慈恩  谢德体
作者单位:重庆师范大学 地理与旅游学院, 重庆 400047;重庆师范大学 地理与旅游学院, 重庆 400047;西南大学 资源环境学院, 重庆 400716;西南大学 资源环境学院, 重庆 400716
基金项目:中国科学院战略性先导科技专项(XDA05050506);国家水体污染控制与治理科技重大专项(2012ZX07104-003)
摘    要:选取重庆市垫江县为川东平行岭谷的典型区,使用1980第二次土壤普查和2011年实测土壤数据,基于土壤类型,运用通用SOC密度/储量计算法和逐步回归分析,对研究区1980—2011年0—20 cm农田SOC动态和动因进行分析,结果表明:(1)1980—2011年农田0—20 cm土层SOC密度/储量总体表现为略有增加态势,单位面积碳增量2307.63 kg C/hm2,碳增汇235945.83 t,增幅为10.74%,年均增长速率为72.11 kg C hm-2a-1;(2)丢碳、固碳和相对平衡面积比37.61∶49.03∶13.36,总体呈西部、西北部高于南部、东南部,更高于东北部和西南部的格局;(3)宏观上1980—2011年农田0—20 cm土层SOC密度/储量变化与土壤类型的分布及利用有很大关系,尤其是黄壤和紫色土在相异的质地本底和不同的扰动下,展现出相反的碳汇/源状态;(4)微观上SOC密度年均变化速率影响最大的因素是SOC密度初始值全N密度C/N比,且全N密度和C/N比拥有正向影响,SOC密度初始值则相反;⑸结果为川东平行岭谷区借助施加适当投入和合适的耕作与管理实践,有效管理农田表层SOC库提供科学依据。

关 键 词:农田SOC密度/储量  年均变化速率  土壤碳源/汇  驱动因素  川东平行岭谷区
收稿时间:2013/5/15 0:00:00
修稿时间:4/3/2014 12:00:00 AM

Dynamics of farmland SOC in parallel ridge valley of east Sichuan during 1980-2011
SHAO Jing''an,HUI Liaoliao,CI En and XIE Deti.Dynamics of farmland SOC in parallel ridge valley of east Sichuan during 1980-2011[J].Acta Ecologica Sinica,2014,34(15):4347-4360.
Authors:SHAO Jing'an  HUI Liaoliao  CI En and XIE Deti
Institution:College of Geography and Tourism, Chongqing Normal University, Chongqing 400047, China;College of Geography and Tourism, Chongqing Normal University, Chongqing 400047, China;College of Resources and Environment, Southwest University, Chongqing 400716, China;College of Resources and Environment, Southwest University, Chongqing 400716, China
Abstract:Global warming and corresponding serious ecological and environmental problems induced by the rising CO2 concentrations have attracted worldwide attentions. And they have become the focus of the international negotiations. As one of the core interface of terrestrial ecosystem, farmland soil in terrestrial ecosystems is the most intense part affected by human frequent disturbance. Management agricultural SOC is internationally recognized as one of the important strategies for mitigating or adapting global warming. Paralleled ridge valley of East Sichuan is typically representative of the concentrated distribution area of farmland around the Sichuan basin. It always plays an important role in the granary of East Sichuan. Recently, the production and management investment and frequent tillage disturbance in order to pursuit food security drove the opposite direction change of farmland SOC. Hence, it was very important to carry out the research on SOC dynamics. And, the farmland use of this region would be promoted to the strategic height responding to global change and food security at regional level. Taking Dianjiang County of Chongqing City is a typical area of East Sichuan parallel ridge valley, this paper analyzed the dynamics of farmland SOC of 0-20 cm soil layer and their driving factors during 1980-2011 by the soil type method, international general SOC density/storage calculation method and Stepwise Regression Analysis, using the second soil survey data in 1980 and the measured data in 2011. The results showed: (1)Farmland SOC density/storage of 0-20 cm soil layer during 1980-2011 in the study area overall presented slightly increased trend. Carbon increment per unit area reached to 2307.63 kg C hm-2. Total content of carbon sink enhancement was 235945.83 t, with the increasing range of 10.74% and the average annual growth rate of 72.11 kg C hm-2 a-1. (2)The proportion of carbon sink, loss and relative balance area to the total area of this study area was 37.61:49.03:13.36. In general, the spatial patterns of farmland SOC sink showed that west and northwest part is higher than that south and southeast, and more than that northeast and southwest. (3) At macro level, the changes of farmland SOC density/storage was pronounced relationship to the distributions of soil type and their utilization practices. Especially, yellow soil and purple soil under different texture and different perturbations, showed the opposite carbon sink/source state.(4) At microcosmic level, the rank of factors obviously influencing SOC density average annual change rate was SOC density > N > C/N. Moreover, total N density and C/N ratio have positive effects on SOC density average annual change rate, the effects of SOC density initial value were negative function.(5)Results of this paper could provide scientific proofs for the effective management of farmland surface SOC carbon pool in the parallel ridge and valley area of East Sichuan, depending on appropriate inputs and suitable cultivation and management practices.
Keywords:farmland SOC density/storage  annual mean change rate  soil carbon source/pool  driving factors  parallel ridge valley of east sichuan
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