JOURNAL OF NATURAL RESOURCES ›› 2014, Vol. 29 ›› Issue (11): 1930-1943.doi: 10.11849/zrzyxb.2014.11.011

• Resource Evaluation • Previous Articles     Next Articles

Temporal-spatial Variations of Soil Organic Carbon and Their Responses to Climate Change in Alpine Area of Southwest China during 1954-2010

GU Feng-xue1, PANG Rui2, ZHANG Yuan-dong2, HUANG Mei3, LI Jie1, HAO Wei-ping1, MEI Xu-rong1   

  1. 1. Key Laboratory of Dryland Agriculture, Ministry of Agriculture, Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China;
    2. Key Laboratory of Forest Ecology and Environment, State Forestry Administration, Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing 100091, China;
    3. Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing100101, China
  • Received:2014-01-21 Revised:2014-03-06 Online:2014-11-20 Published:2014-11-20

Abstract:

There are various types of ecosystems and complex landform in alpine area of southwest China, which make it an ideal place to research regional response to global changes in climate. A process-based biogeochemical model CEVSA (Carbon Exchange between Vegetation, Soil, and the Atmosphere) was used to estimate temporal and spatial variations of soil organic carbon (SOC) in alpine area of southwest China during 1954-2010. The results showed: 1) The mean values of SOC density were 14.16 kg C·m-2 during1954-2010 in alpine area of southwest China. In spatial distribution, SOC density increased from southeast to northwest and was significantly negatively correlated with annual mean temperature(r=-0.447, P<0.01), but had no significant correlation with annual total precipitation. 2) Total SOC storage ranged from 6.95 to 7.64 Pg C and showed a statistically significant increasing trend with a growth rate of 0.013 Pg C (P<0.05) during 1954-2010. 3) The increasing trend of SOC density was highly significant (P<0.01) in herbaceous cover (closed-open), evergreen needle-leaved tree cover and evergreen broad-leaved tree cover which was the three main vegetation types. SOC density of herbaceous cover (closed- open) and evergreen needle- leaved tree cover in the study area were both correlated positively with annual mean temperature (r=0.527, P<0.01; r=0.501, P<0.01) but SOC density of evergreen broad-leaved tree cover had no correlation with annual mean temperature. There were no significant correlation between SOC density and annual total precipitation in all of the three vegetation types. 4) The growth of soil organic carbon (SOC) storage may slow down or reverse by ongoing climate change, for that HR was more sensitive to temperature than LT which acted as the carbon input of soil ecosystem.

Key words: CEVSA model, alpine forest, soil organic carbon, climate change 1943

CLC Number: 

  • S153.6+2