摘要
分析全球不同气候带陆地植被净初级生产力(NPP)的变化趋势与可持续性,对于估算全球陆地生态系统的结构、功能和碳源(汇)具有重要意义。运用Mann-Kendall突变检验、Theil-Sen斜率估计、Hurst指数分析全球不同气候带陆地NPP的变化趋势与可持续性。结果表明:(1)全球陆地NPP有明显的地域分异规律,呈现低纬高、高纬低,沿海高、内陆低的特点。约48.79%陆地生态系统的植被NPP得到了改善,其中显著改善的面积占全球陆地生态系统的8.45%,主要分布在北美洲北部和中部、亚马逊河流域西部、刚果盆地、欧洲南部、印度半岛西北部、中国黄土高原;轻微改善的面积占全球陆地生态系统的40.34%,主要分布在南美洲中南部、亚洲东部和澳大利亚大陆东部。(2)各气候带NPP变化趋势和突变点表现为:热带、亚热带、极地带的NPP呈不显著下降趋势(R^(2)=0.111,P=0.176;R^(2)=0.144,P=0.120;R^(2)=0.002,P=0.854),热带无明显突变点,亚热带突变点为2015年,极地带突变点为2005年;干旱气候带的NPP呈不明显上升趋势(R^(2)=0.036,P=0.450),突变点为2009年;温带寒温带的NPP呈显著的上升趋势(R^(2)=0.533,P=0.001),突变点为2014年。(3)各气候带NPP与降水、气温的关系为:干旱气候带、极地带NPP为水分限制型,热带、温带寒温带NPP为热量限制型,亚热带NPP受气温、降水影响不显著。(4)在未来一段时间内,全球陆地NPP呈减少的面积(51.31%)大于增加的面积(48.69%)。其中,干旱气候带、亚热带、温带寒温带的NPP呈减少的面积明显大于增加的面积,将是防止NPP退化工作的重点区域。以上研究结果可为国内外同行对比分析全球不同气候带陆地生态系统的碳源(汇)功能提供参考。
Studying the change trend and sustainability of vegetation net primary productivity(NPP)of terrestrial ecosystems in different global climatic zones is important for estimating the structure,function and carbon sources(sinks)of global terrestrial ecosystems.In this article,the change trend and sustainability of NPP of terrestrial ecosystems in different global climatic zones were analyzed using Mann-Kendall mutation test,Theil-Sen slope estimation,and Hurst index.The results showed that:(1)The global terrestrial NPP had obviously regional differentiation.The NPP value was higher in the lower latitude regions than the higher latitude regions,and higher in coastal regions than hinterland.The area of NPP improved accounted for 48.79%of the global terrestrial ecosystem.Among these improved areas,the significantly improved area accounted for 8.45%of the global terrestrial ecosystem,which is mainly distributed in the north and central of North America,the west of the Amazon Basin,the Congo Basin,southern Europe,the northwest of the Indian Peninsula and the Loess Plateau of China;The slightly improved area accounted for 40.34%of the global terrestrial ecosystem,mainly distributed in central and southern South America,Eastern Asia and eastern Australia.(2)The change trend and mutation point of NPP in each climate zone were as follows:NPP in tropical,subtropical,and polar zones showed a non-significant decreasing trend(R^(2)=0.111,P=0.176;R^(2)=0.144,P=0.120;R^(2)=0.002,P=0.854),with no significant mutation point in the tropics,the mutation point of the subtropics in 2015,and the mutation point of the polar zone in 2005;the NPP in arid showed a non-significant increasing trend(R^(2)=0.036,P=0.450)with the mutation point in 2009;the NPP in temperate and cold temperate zone showed a significant increasing trend(R^(2)=0.533,P=0.001)with the mutation point in 2014.(3)For the relationship between NPP with precipitation and temperature in each climate zone,NPP in arid climate zones and polar zones were moisture-limited,NPP in t
作者
徐雪
罗娅
杨胜天
陆晓辉
周秋文
刘茂
石春茂
廖梦垚
XU Xue;LUO Ya;YANG Shengtian;LU Xiaohui;ZHOU Qiuwen;LIU Mao;SHI Chunmao;LIAO Mengyao(School of Geographic and Environmental Science,Guizhou Normal University,Guiyang 550025,China;State Key Laboratory Incubation Base for Karst Mountain Ecology Environment of Guizhou Province,Guiyang 550025,China;College of Water Sciences,Beijing Normal University,Beijing 100875,China)
出处
《生态学报》
CAS
CSCD
北大核心
2023年第9期3729-3743,共15页
Acta Ecologica Sinica
基金
国家自然科学基金委员会-贵州省人民政府喀斯特科学研究中心项目(U1812401)
国家自然科学基金项目(41867001)
贵州省普通高等学校科技拔尖人才支持计划(黔教合KY[2018]042)
贵州省水利科技项目(KT202108)。
