摘要
近几十年,生态环境发生明显改变,植被净初级生产力(NPP)成为表征陆地生态系统碳汇状况的重要指标.以中国内陆干旱区黑河流域为研究区,使用1985~2015年逐月栅格NPP、降水和平均气温数据,分别采用Mann-Kendall趋势检验法、Pettitt突变点检验法分析年NPP时空变化特征,基于渔网分析和重心转移模型探索不同空间位置上年NPP重心转移对气候因子重心转移的响应规律,同时揭示年NPP与气候因子的相关响应,最后探讨了地貌分布和气候因子对年NPP变化的影响.结果表明:(1)1985~2015年,黑河流域年NPP显著增加和显著减少面积分别占总面积44.98%和35.27%;(2)黑河流域总面积的80.12%区域年NPP变化存在显著突变点,主要发生在1989~2010年;(3)与1985年相比,2015年在全流域分别有21.69%和26.78%网格数目上年NPP重心转移方向与年降水量和年平均气温重心转移方向一致;(4)气候因子和非气候因子对年NPP变化贡献率的平均值分别为16.13%和83.87%.研究成果有利于了解黑河流域植被碳汇时空特征,从而进一步为黑河流域环境保护政策和规划的制定提供科学依据.
In recent decades,ecological environment has changed greatly,and net primary productivity of vegetation(NPP)of vegetation has become an important indicator to characterize the carbon sink status.In this study,the Heihe River Basin in the arid region of inland China was used as the research area,temporal and spatial variation characteristics of annual NPP was analyzed using monthly grid NPP,precipitation and average temperature data from 1985 to 2015,by applying Mann-Kendall trend test method and Pettitt change-point test method.The response of the annual NPP gravity shift to the climate factors gravity shift in different grids was investigated based on the fishing nets and the center of gravity shift model,the contribution rates of climate change and non-climatic factors to changes in NPP was quantified,and the influence of landform and climate factors on annual NPP changes was finally discussed.The results show that:(1)the annual NPP from 1985 to 2015 in 44.98%of the Heihe River Basin has a significant increase,while 35.27%of the basin has a significant decrease;(2)80.12%of the total area has significant change-points from 1989 to 2010;(3)the shifting direction of the annual NPP gravity center from 1985 to 2015 is consistent with that of the annual precipitation and the annual average temperature in 21.69%and 26.78%of the grid numbers,respectively;(4)the average contribution rates of climatic factors and non-climatic factors to the annual NPP change are 16.13%and 83.87%,respectively.The research results are conducive to understanding the temporal and spatial characteristics of vegetation carbon sinks,thereby further providing a certain scientific basis for the formulation of environmental protection policies and plans in the Heihe River Basin.
作者
贾路
于坤霞
邓铭江
李鹏
李占斌
时鹏
徐国策
JIA Lu;YU Kunxia;DENG Mingjiang;LI Peng;LI Zhanbin;SHI Peng;XU Guoce(State Key Laboratory of Eco-Hydraulics in Northwest Arid Region of China,Xi’an University of Technology,Xi’an 710048,China;Key Laboratory of National Forestry and Grassland Administration on Ecological Hydrology and Disaster Prevention in Arid Regions,Xi’an University of Technology,Xi’an 710048,China)
出处
《应用基础与工程科学学报》
EI
CSCD
北大核心
2023年第3期523-540,共18页
Journal of Basic Science and Engineering
基金
国家自然科学基金面上项目(52079104)
中国工程院咨询项目(2020-XZ14)
国家自然科学基金重点项目(U2040208)
陕西省重点研发计划(2023-ZDLSF-60)
