气候变化与人为活动对三江源草地生产力影响的定量研究

发布时间：2018-05-06 08:55

本文选题：净初级生产力 + 土地利用/覆盖变化　；参考：《草业学报》2017年05期

【摘要】：近数十年来在气候变化和生态工程实施的背景下,作为我国重要的生态屏障的三江源地区的气候条件和人为干扰都发生了明显的变化。本研究借助CASA模型和气候生产力模型,结合对土地利用/覆盖变化(LUCC)的分析,定量评估了气候变化、LUCC和草地管理措施对三江源草地净初级生产力(NPP)变化的影响。结果表明,1)2001-2012年间,三江源草地总面积增加了6749km~2,草地的平均NPP下降了5.47%,总NPP下降了5.00%。2)由新增加的草地带来的NPP总量为1293.12Gg C,由转出草地带来的NPP总量损失为215.42Gg C。3)2012年气候总NPP比2001年下降了20.27%,而人为总NPP增加了41.51%。12年间气候变化的趋势不利于草地植被的生长,而人为活动对草地植被的负面影响力有明显减弱。4)由气候因素引起的草地总NPP变化量为-165.28Tg C,而管理措施引起的总NPP变化量为140.03Tg C;LUCC导致的草地总NPP变化量为2.22Tg C。草地管理措施的改进对遏制草地退化起到了决定性作用。
[Abstract]:Under the background of climate change and the implementation of ecological engineering in recent decades, the climatic conditions and anthropogenic disturbances in the source region of the three Rivers, which are important ecological barriers in China, have changed obviously. With the help of CASA model and climate productivity model, combined with the analysis of land use / cover change (LUCC), the effects of climate change Lucc and grassland management measures on the net primary productivity (NPP) of grassland in Sanjiangyuan were quantitatively evaluated. The results show that between 2001 and 2012, The total area of grassland in the source of the three rivers increased by 6749km2, the average NPP of grassland decreased by 5.47km2, the total NPP decreased by 5.00.2.) the total NPP brought by the newly increased grassland was 1293.12Gg C, and the total loss of NPP brought by the transferred grassland was 215.42Gg C.3) the total climate NPP in 2012 was lower than that in 2001. The total artificial NPP increased by 41.51%, and the trend of climate change was not conducive to the growth of grassland vegetation in the past 12 years. However, the negative influence of human activities on grassland vegetation was significantly weakened. 4) the total NPP change of grassland caused by climatic factors was -165.28 TG C, while the total NPP change caused by management measures was 2.22Tg C. The improvement of grassland management measures has played a decisive role in controlling grassland degradation.
【作者单位】：南京大学生命科学学院;河海大学地球科学与工程学院地理信息科学系;
【基金】：江苏省农业三新工程项目(SXGC[2014]287) 国际APN全球变化项目(No.ARCP2015-03CMY-Li&CAF2015-RR14-NMYOdeh) 国家自然科学基金(41271361) 国家863计划(2007AA10Z231)资助
【分类号】：S812

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