中国地理科学 ›› 2017, Vol. 27 ›› Issue (3): 351-361.doi: 10.1007/s11769-017-0868-8

• 论文 • 上一篇    下一篇

Influence of Climate on Soil Organic Carbon in Chinese Paddy Soils

WANG Dandan1, YAN Yechao1, LI Xinhui1, SHI Xuezheng2, ZHANG Zhongqi3, David C WEINDORF4, WANG Hongjie2, XU Shengxiang2   

  1. 1. School of Geography and Remote Sensing, Nanjing University of Information Science & Technology, Nanjing 210044, China;
    2. State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China;
    3. Jiangsu Normal University, Xuzhou 221116, China;
    4. Department of Plant and Soil Sciences, Texas Tech University, Lubbock, 79409, USA
  • 收稿日期:2016-04-06 修回日期:2016-08-15 出版日期:2017-06-27 发布日期:2017-05-09
  • 通讯作者: SHI Xuezheng. E-mail: xzshi@issas.ac.cn E-mail:xzshi@issas.ac.cn
  • 基金资助:

    Under the auspices of National Natural Science Foundation of China (No. 41301242, 41201213), Strategic Priority Research Program of the Chinese Academy of Sciences (No. XDA05050509)

Influence of Climate on Soil Organic Carbon in Chinese Paddy Soils

WANG Dandan1, YAN Yechao1, LI Xinhui1, SHI Xuezheng2, ZHANG Zhongqi3, David C WEINDORF4, WANG Hongjie2, XU Shengxiang2   

  1. 1. School of Geography and Remote Sensing, Nanjing University of Information Science & Technology, Nanjing 210044, China;
    2. State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China;
    3. Jiangsu Normal University, Xuzhou 221116, China;
    4. Department of Plant and Soil Sciences, Texas Tech University, Lubbock, 79409, USA
  • Received:2016-04-06 Revised:2016-08-15 Online:2017-06-27 Published:2017-05-09
  • Contact: SHI Xuezheng. E-mail: xzshi@issas.ac.cn E-mail:xzshi@issas.ac.cn
  • Supported by:

    Under the auspices of National Natural Science Foundation of China (No. 41301242, 41201213), Strategic Priority Research Program of the Chinese Academy of Sciences (No. XDA05050509)

摘要:

Soil organic carbon (SOC) is a major component of the global carbon cycle and has a potentially large impact on the greenhouse effect. Paddy soils are important agricultural soils worldwide, especially in Asia. Thus, a better understanding of the relationship between SOC of paddy soils and climate variables is crucial to a robust understanding of the potential effect of climate change on the global carbon cycle. A soil profile data set (n = 1490) from the Second National Soil Survey of China conducted from 1979 to 1994 was used to explore the relationships of SOC density with mean annual temperature (MAT) and mean annual precipitation (MAP) in six soil regions and eight paddy soil subgroups. Results showed that SOC density of paddy soils was negatively correlated with MAT and positively correlated with MAP (P < 0.01). The relationships of SOC density with MAT and MAP were weak and varied among the six soil regions and eight paddy soil subgroups. A preliminary assessment of the response of SOC in Chinese paddy soils to climate indicated that climate could lead to a 13% SOC loss from paddy soils. Compared to other soil regions, paddy soils in Northern China will potentially more sensitive to climate change over the next several decades. Paddy soils in Middle and Lower Yangtze River Basin could be a potential carbon sink. Reducing the climate impact on paddy soil SOC will mitigate the positive feedback loop between SOC release and global climate change.

关键词: soil organic carbon, paddy soils, mean annual temperature, mean annual precipitation, climate change

Abstract:

Soil organic carbon (SOC) is a major component of the global carbon cycle and has a potentially large impact on the greenhouse effect. Paddy soils are important agricultural soils worldwide, especially in Asia. Thus, a better understanding of the relationship between SOC of paddy soils and climate variables is crucial to a robust understanding of the potential effect of climate change on the global carbon cycle. A soil profile data set (n = 1490) from the Second National Soil Survey of China conducted from 1979 to 1994 was used to explore the relationships of SOC density with mean annual temperature (MAT) and mean annual precipitation (MAP) in six soil regions and eight paddy soil subgroups. Results showed that SOC density of paddy soils was negatively correlated with MAT and positively correlated with MAP (P < 0.01). The relationships of SOC density with MAT and MAP were weak and varied among the six soil regions and eight paddy soil subgroups. A preliminary assessment of the response of SOC in Chinese paddy soils to climate indicated that climate could lead to a 13% SOC loss from paddy soils. Compared to other soil regions, paddy soils in Northern China will potentially more sensitive to climate change over the next several decades. Paddy soils in Middle and Lower Yangtze River Basin could be a potential carbon sink. Reducing the climate impact on paddy soil SOC will mitigate the positive feedback loop between SOC release and global climate change.

Key words: soil organic carbon, paddy soils, mean annual temperature, mean annual precipitation, climate change