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

发布时间：2018-01-01 23:30

本文关键词：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　出处：《生态学报》2017年09期 　论文类型：期刊论文

更多相关文章： 农地利用 碳排放 碳吸收 可持续性

【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N_2O释放、秸秆燃烧碳排放和牲畜养殖CH_4和N_2O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]:Taking Pingdu City in eastern Shandong Province as a case study, the paper establishes a carbon emission measurement system by identifying important sources of carbon emissions from agricultural land, including indirect carbon emissions from agricultural chemicals, and energy consumption carbon emissions. Soil direct N2O emissions, straw burning carbon emissions and CH_4 and N2O emissions from livestock farming were measured after application of nitrogen fertilizer, and the carbon emissions from agricultural land use from 1995 to 2013 were calculated. Based on the output value of agricultural products, the change characteristics of carbon intensity in farmland utilization were analyzed. The variation of carbon sustainability index of agricultural land use is analyzed by combining with crop carbon absorption. The order of carbon emissions per year from 1995 to 2013 was: 225,000 tons of agricultural materials were put into livestock and 174,100 tons of straw burned 66,200 tons. The carbon emission from straw combustion increased year by year, while the input of agricultural materials and livestock farming decreased year by year. The output value of agricultural products increased faster than the rate of carbon emissions from agricultural land use. Carbon emission per unit output value has decreased from 1.24 t / yuan in 1995 to 0.35 t / yuan in 2013. Carbon absorption is larger than carbon emission during the use of Pingdu farmland, and the carbon sustainability index increases at an average annual rate of 7.12%. Therefore, the carbon absorption of Pingdu crops during the production period can completely absorb the carbon emissions from farmland utilization. This study not only provides a scientific basis for the emission and sustainable development of agricultural land use in the middle and small scale, but also for the eastern region of China. According to. It is beneficial to promote carbon abatement in agriculture in China, and provide basic material for the study of LUCC-carbon cycle in the international human factor plan of global environmental change.
【作者单位】：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;中国科学院大学;
【基金】：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)]
【分类号】：S181
【正文快照】： 土地利用/土地覆盖变化(LUCC)、全球碳循环是国际全球环境变化人文因素计划下的重大环境问题。在国家和社会的资助下,我国已在LUCC、碳循环等多个领域做了诸多有益探讨[1]。如刘纪远等对中国LUCC有很深入的研究,通过土地覆盖动态度模型、区域分析模型和随机过程模型等进行变化

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