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[1]LIU Yangyang,WANG Qian,YANG Yue,et al.Spatiotemporal Dynamic of Vegetation Carbon Use Efficiency and Its Relationship with Climate Factors in China During the Period 2000-2013[J].Research of Soil and Water Conservation,2019,26(05):278-286.

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Spatiotemporal Dynamic of Vegetation Carbon Use Efficiency and Its Relationship with Climate Factors in China During the Period 2000-2013

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 26 Number of periods: 2019 05 Page number: 278-286 Column: Public date: 2019-09-06

Title:: Spatiotemporal Dynamic of Vegetation Carbon Use Efficiency and Its Relationship with Climate Factors in China During the Period 2000-2013

Author(s):: LIU Yangyang¹, WANG Qian¹, YANG Yue², TONG Linjing¹, LI Jianlong¹, ZHANG Zhaoying³, WANG Zhenqian⁴; 1. Department of Ecology, School of Life Science, Nanjing University, Nanjing 210023, China;
2. Nanjing Institute of Environmental Sciences, Ministry of Environmental Protection of the People’s Republic of China, Nanjing 210042, China;
3. International Institute for Earth System Science, Nanjing University, Nanjing 210023, China;
4. School of Earth Sciences, Lanzhou University, Lanzhou 730000, China

Keywords:: spatiotemporal dynamics; carbon efficiency (CUE); net primary productivity (NPP); gross primary productivity (GPP); climate change; trend analysis; coefficient of variation

CLC:: X718

DOI:: -

Abstract:: Carbon use efficiency (CUE) is an important indicator to evaluate the carbon cycle of terrestrial ecosystem. Assessing the responses of CUE to climate change is of great significance to the study of terrestrial ecosystem carbon cycle. In this study, the vegetation CUE was calculated based on the MOD17 dataset, and the temporal and spatial dynamics of vegetation CUE in response to climate change in China during 2000-2013 were also analyzed. The results showed that the vegetation CUE presented a slightly increasing trend during the study period overall. Specifically, the vegetation CUE showed a decreasing trend during the period 2000-2007 with the change rate of 0.000 6, but presented a significant increasing trend from 2007 to 2013, which could be attributable to the change of climate pattern in 2007. The spatial distribution of vegetation CUE had obvious spatial heterogeneity. The vegetation CUE was generally high in the west and low in the east. The regions where vegetation CUE showed an obviously increasing trend were mainly located in the Hulun Buir region of Inner Mongolia, most of parts of the Qinghai Tibet Plateau, the eastern coastal area and the Taiwan Island. However, the regions where vegetation CUE showed an obviously decreasing trend mainly distributed in the Northeast Plain and most areas of central China, while the other areas in the south of the Yangtze River and some parts of Xinjiang also had sporadic distribution. The fluctuation of vegetation CUE in grassland and forest area was relatively small, which indicated that the ecosystem in these areas was in a virtuous circle. The mean CUE values of different vegetation types follow an order of:grassland (0.21) > farmland (0.14) > forest (0.09) > shrub (0.06). The vegetation CUE in most areas was positively correlated with precipitation, but was negatively correlated with the temperature, and this correlation variation with the change of regional climate patterns and vegetation types. In general, the increase of CUE in China was mainly attributed to the increase of precipitation, while the increase of temperature induced the decrease of vegetation CUE.

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