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吴金凤,王秀红.农地利用碳强度及可持续性动态变化——以山东省平度市为例.生态学报,2017,37(9):2904~2912 本文二维码信息
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农地利用碳强度及可持续性动态变化——以山东省平度市为例
Dynamic changes in the carbon intensity and sustainability of farmland use: A case study in Pingdu County, Shandong Province, China
投稿时间:2016-01-18  最后修改时间:2016-10-14
DOI: 10.5846/stxb201601180120
关键词农地利用  碳排放  碳吸收  可持续性
Key Wordsfarmland use  carbon emissions  carbon absorption  sustainability
基金项目国家自然科学基金项目"东西部土地集约利用变化及其生态风险的对比研究"[41371531(2014-2017)]
作者单位E-mail
吴金凤 中国科学院地理科学与资源研究所, 陆地表层格局与模拟院重点实验室, 北京 100101;中国科学院大学, 北京 100049  
王秀红 中国科学院地理科学与资源研究所, 陆地表层格局与模拟院重点实验室, 北京 100101 wangxh@igsnrr.ac.cn 
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摘要:
以中国东部山东省平度市为案例区,通过识别重要的农地利用碳排放源和构建碳排放测算体系,包括农用化学物质投入间接碳排放、耗能碳排放、氮肥施用后导致的土壤直接N2O释放、秸秆燃烧碳排放和牲畜养殖CH4和N2O排放,测算了1995-2013年农地利用的碳排放量;结合农产品产值分析了农地利用碳强度变化特征,结合农作物碳吸收分析了农地利用的碳可持续指数的变化规律。研究得出:(1)1995-2013年平度年均碳排放量的次序是:农资投入22.50万t > 牲畜养殖17.41万t > 秸秆燃烧6.62万t,其中秸秆燃烧碳排放呈逐年增加态势,而农资投入和畜牧养殖均呈逐年减少趋势。(2)平度农地利用碳强度变化结果表明,农产品产值增加速度超过农地利用碳排放速度,单位产值碳排放已从1995年的1.24 t/元降至2013年的0.35 t/元。(3)碳可持续性指数变化特征表明,平度农地利用过程中碳吸收大于碳排放,且碳可持续性指数以年均7.12%速率增长,故平度农作物生产期的碳吸收能够完全消纳农地利用过程中所产生碳排放。该研究不仅为中小尺度以及我国东部区域的农地利用碳排放及可持续发展提供科学依据,而且有益于推进我国农业的碳减排,并为国际全球环境变化人文因素计划中LUCC、碳循环等重大问题的研究提供基本素材。
Abstract:
During 1995-2013, the carbon emissions for farmland uses in Pingdu County (in Shandong Province, China) were calculated by selecting the main sources of emissions and establishing a measurement system for the sources, including indirect carbon emissions for agrochemical inputs, direct N2O emissions for N fertilization, carbon emissions for energy consumption and straw burning, and CH4 and N2O emissions for livestock farming. The changes in carbon intensity were calculated based on the changes in agricultural output value, and the changes in the carbon sustainability index were calculated based on the carbon emissions of the main sources and carbon absorption by the main crops. The results were as follows: (1) The order of annual mean carbon emissions was agrochemical materials (22.50 ten thousand tons) > livestock farming (17.41 ten thousand tons) > straw burning (6.62 ten thousand tons). The carbon emissions for straw burning showed an increasing trend, whereas the emissions from the other sources showed a decreasing trend. (2) The increasing rate for the agricultural output value exceeded that of total carbon emissions, with the carbon emissions per agricultural output value decreasing from 1.24 t/Yuan in 1995 to 0.35 t/Yuan in 2013 (annual average decrease of 0.0459 t/Yuan). (3) The carbon sustainability index had an annual average increasing rate of 7.12%. This trend indicated that the carbon absorption by crops was greater than the carbon emissions from the farmland processes. Overall, this study not only provides an understanding of carbon emissions and a scientific basis for sustainable development of farmland in small-or medium-scale regions in eastern China, but it also promotes the reduction of agricultural carbon emissions in China. In addition, this study could provide basic information for the investigation of Land-Use and Land-Cover Change and Carbon Cycle of International Human Dimensions Programme on Global Environmental Change.
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