本文選題：凈初級(jí)生產(chǎn)力 + 土地利用/覆蓋變化　； 參考：《草業(yè)學(xué)報(bào)》2017年05期

【摘要】：近數(shù)十年來在氣候變化和生態(tài)工程實(shí)施的背景下,作為我國重要的生態(tài)屏障的三江源地區(qū)的氣候條件和人為干擾都發(fā)生了明顯的變化。本研究借助CASA模型和氣候生產(chǎn)力模型,結(jié)合對(duì)土地利用/覆蓋變化(LUCC)的分析,定量評(píng)估了氣候變化、LUCC和草地管理措施對(duì)三江源草地凈初級(jí)生產(chǎn)力(NPP)變化的影響。結(jié)果表明,1)2001-2012年間,三江源草地總面積增加了6749km~2,草地的平均NPP下降了5.47%,總NPP下降了5.00%。2)由新增加的草地帶來的NPP總量為1293.12Gg C,由轉(zhuǎn)出草地帶來的NPP總量損失為215.42Gg C。3)2012年氣候總NPP比2001年下降了20.27%,而人為總NPP增加了41.51%。12年間氣候變化的趨勢(shì)不利于草地植被的生長,而人為活動(dòng)對(duì)草地植被的負(fù)面影響力有明顯減弱。4)由氣候因素引起的草地總NPP變化量為-165.28Tg C,而管理措施引起的總NPP變化量為140.03Tg C;LUCC導(dǎo)致的草地總NPP變化量為2.22Tg C。草地管理措施的改進(jìn)對(duì)遏制草地退化起到了決定性作用。
[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.
【作者單位】： 南京大學(xué)生命科學(xué)學(xué)院;河海大學(xué)地球科學(xué)與工程學(xué)院地理信息科學(xué)系;
【基金】：江蘇省農(nóng)業(yè)三新工程項(xiàng)目(SXGC[2014]287) 國際APN全球變化項(xiàng)目(No.ARCP2015-03CMY-Li&CAF2015-RR14-NMYOdeh) 國家自然科學(xué)基金(41271361) 國家863計(jì)劃(2007AA10Z231)資助
【分類號(hào)】：S812

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