Vegetation dynamics and its driving forces from climate change and human activities in the Three-River Source Region, China from 1982 to 2012.
Vegetation dynamics and its driving forces from climate change and human activities in the Three-River Source Region, China from 1982 to 2012.
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DOI：
10.1016/j.scitotenv.2016.03.223
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发表时间：
2016-09
期刊：
影响因子：
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通讯作者：
Ying Zhang;Chaobin Zhang;Zhaoqi Wang;Yizhao Chen;Chengcheng Gang;R. An;Jian-long Li
中科院分区：
文献类型：
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作者：
Ying Zhang;Chaobin Zhang;Zhaoqi Wang;Yizhao Chen;Chengcheng Gang;R. An;Jian-long Li
三河源区是关系国家生态安全的重要地区，近几十年来，在一系列生态修复工程的推动下，经历了气候变化和人类活动的转变。为了揭示植被动态的时空动态并计算1982年至2012年不同时期TRSR中驱动因素的贡献，采用卡内基-艾姆斯-斯坦福方法模型估算的净初级生产力（NPP）来评估植被状况。分析了不同气候变化趋势对NPP年际变化的实际影响。进一步定量分析了NPP与不同气候因素和人类活动的关系。结果表明：1982年至2012年，研究区平均NPP为187.37 g cm−2yr−1。31年的研究期间，平均NPP呈现波动但总体呈上升趋势，增长率为1.31 g cm−2yr−2。整个研究期间，气温、降水和太阳辐射对NPP年际变化的平均贡献为整个区域分别为 0.58、0.73、 和 0.09 g cm−2yr−2 分别。辐射是对NPP年际变化影响最大的气候因子。制约NPP增长的因素由气温、辐射转变为降水。气候变化和人类活动对NPP年际变化的平均贡献分别为1.40 g cm−2yr−2和−0.08 g cm−2yr−2。 1982年至2000年，总体气候条件有利于植被恢复，而人类活动对植被生长的负面影响较弱。 2001年至2012年，气候条件开始对植被生长产生负面影响，而人类活动则对植被恢复产生有利影响。
The Three-River Source Region (TRSR), a region with key importance to the ecological security of China, has undergone climate changes and a shift in human activities driven by a series of ecological restoration projects in recent decades. To reveal the spatiotemporal dynamics of vegetation dynamics and calculate the contributions of driving factors in the TRSR across different periods from 1982 to 2012, net primary productivity (NPP) estimated using the Carnegie–Ames–Stanford approach model was used to assess the status of vegetation. The actual effects of different climatic variation trends on interannual variation in NPP were analyzed. Furthermore, the relationships of NPP with different climate factors and human activities were analyzed quantitatively. Results showed the following: from 1982 to 2012, the average NPP in the study area was 187.37 g cm− 2yr− 1. The average NPP exhibited a fluctuation but presented a generally increasing trend over the 31-year study period, with an increase rate of 1.31 g cm− 2yr− 2. During the entire study period, the average contributions of temperature, precipitation, and solar radiation to NPP interannual variation over the entire region were 0.58, 0.73, and 0.09 g cm− 2yr− 2, respectively. Radiation was the climate factor with the greatest influence on NPP interannual variation. The factor that restricted NPP increase changed from temperature and radiation to precipitation. The average contributions of climate change and human activities to NPP interannual variation were 1.40 g cm− 2yr− 2and − 0.08 g cm− 2yr− 2, respectively. From 1982 to 2000, the general climate conditions were favorable to vegetation recovery, whereas human activities had a weaker negative impact on vegetation growth. From 2001 to 2012, climate conditions began to have a negative impact on vegetation growth, whereas human activities made a favorable impact on vegetation recovery.