首页|Spatiotemporal variations of carbon flux and nitrogen deposition flux linked with climate change at the centennial scale in China

Spatiotemporal variations of carbon flux and nitrogen deposition flux linked with climate change at the centennial scale in China

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The spatial and temporal variations of the vegetation carbon flux in China from 1901 to 2005 were studied using the vegetation net primary production (NPP) values from seven Earth-system models.In addition,the temporal and spatial changes in the nitrogen deposition flux in China were studied using the NHx and NOy fluxes from 1901 to 2005.The relationship between changes in the carbon flux,nitrogen flux and climate was analyzed.The results show that (1) over the past 100 years,NPP in China has shown an upward trend.The average trend coefficient is 0.88 and the NPP distribution trend is generally low in the north and high in the south,with a gradual increase from the northwest to the southeast.Temperature,precipitation and radiation are all conducive to plant growth in the direction of the gradient.The correlation coefficients between the ensemble model mean NPP and temperature,precipitation,longwave radiation and shortwave radiation are 0.88,0.73,0.91 and 0.67,respectively.(2) In the past 100 years,the NHx and NOy fluxes in China have shown an upward trend,with trend coefficients of 0.98 and 0.98,respectively,which pass the 99.9％ confidence level of the t-test.NHx and NOy fluxes are also generally low in the north and high in the south,with a gradual increase from the northwest to the southeast in a step-like pattern.(3) The spatial distribution of the correlation coefficients between the NHx and NOy fluxes and air temperature is similar,with only slight differences in values.The spatial distribution of the correlation coefficients between the NHx and NOy fluxes and precipitation is similar in overall pattern,but the pattern is relatively complicated,with a positive-negative-positive-negative-positive pattern occurring across the monsoon region from north to south,and a negative-positive-negative-positive pattem occurring beyond the monsoon region from east to west.(4) The spatial distribution of the correlation coefficients between the NHx and NOy fluxes and NPP shows a generally consistent pattern,but the pattem is relatively uneven.The average distribution of the ensemble model mean is positive correlation in northeast China and southwest China,and alternating positive and negative correlation in other regions.

Net primary production (NPP)TemperaturePrecipitationNHxNOy

Dongdong GAO、Li DAN、Guangzhou FAN、Hanqin TIAN、Jing PENG、Xiujing YANG、Fuqiang YANG、Yueyue LI

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Key Laboratory of Regional Climate-Environment for Temperate East Asia, Institute of Atmospheric Physics,Chinese Academy of Sciences, Beijing 100029, China

College of Atmospheric Science, Chengdu University of Information Engineering, Chengdu 610225, China

International Center for Climate and Global Change Research, Auburn University, AL 36849, USA

University of Chinese Academy of Sciences, Beijing 100049, China

Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China

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This study was supported by the National Natural Science Foundation of ChinaNational Key Research and Development Program of China

41630532 & 415750932016YFA0602501 & 2018YFA0606004

2020

中国科学:地球科学(英文版)
中国科学院

中国科学:地球科学(英文版)

CSCDSCIEI
影响因子：1.002
ISSN：1674-7313
年,卷(期)：2020.63(5)
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