Chin J Plant Ecol ›› 2018, Vol. 42 ›› Issue (3): 297-306.DOI: 10.17521/cjpe.2017.0061

• Research Articles • Previous Articles     Next Articles

Spatial distribution and influencing factors of soil organic carbon among different climate types in Sichuan, China

WANG Li-Hua1,2,XUE Jing-Yue2,3,XIE Yu2,WU Yan2,*()   

  1. 1 Aba Teachers University, Wenchuan, Sichuan 623002, China
    2 Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China
    3University of Chinese Academy of Sciences, Beijing 100049, China
  • Online:2018-03-20 Published:2017-06-16
  • Contact: Yan WU
  • Supported by:
    Supported by the Strategic Priority Research Program of the Chinese Academy of Sciences(XDA05050307)


Aims Spatial distribution and influencing factors of soil organic carbon (SOC) content among different climate types were studied to gain new insights into the estimation and dynamics of SOC.

Methods The study areas are located in the mountain meadow in Guanyuan City, Ya’an City, Liangshan Prefecture of Sichuan Province, China. Plant populations were recorded according to species, number, coverage, meantime, and soil samples (0-10, 10-20, 20-30 cm) were collected and analyzed for SOC content, the carbon content of root, soil pH value, and soil total nitrogen. The diversity indices for plant community diversity (Shannon-? Wiener index) was also calculated to analyze their relationships with SOC content among different climate types.

Important findings Results showed that: (1) SOC in three sites was significantly different and was in the order of Ya’an > Liangshan Prefecture > Guanyuan, and decreased with soil depth. (2) The percentage of SOC content in each vertical layer out of total SOC was lower in the 0-10 cm layer at Ya’an site than at the other two sites, but was higher than the other two sites in the 10-20 cm layer. (3) At Guanyuan site, SOC content in 10-20 cm was significantly positively correlated with plant species richness index and SOC content in 20-30 cm was negatively correlated with plant Shannon-Winner index, while soil pH value and soil total nitrogen were significantly positively correlated with SOC content in each layer. At Ya’an site, SOC content in each layer only had positive correlation with soil pH value, but not with other examined factors. At Liangshan Prefecture site, SOC content in each layer only had positive correlation with soil nitrogen content, but not with other examined factors. (4) Principal component analysis showed that, at Guanyuan, Ya’an and Liangshan Prefecture sites, the total contents of SOC were dominantly affected by climate, followed by vegetation type.

Key words: climate factor, grassland, soil organic carbon, distribution characteristics, correlation analysis