JOURNAL OF NATURAL RESOURCES ›› 2010, Vol. 25 ›› Issue (10): 1709-1717.doi: 10.11849/zrzyxb.2010.10.009

• Resources Ecology • Previous Articles     Next Articles

A Study on Carbon Biogeochemical Cycles in Inner Mongolia Steppe, China

GENG Yuan-bo1, LUO Guang-qiang1,2, LI Ming-feng1   

  1. 1. Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China;
    2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2009-07-30 Revised:2010-06-28 Online:2010-10-20 Published:2010-10-20

Abstract: Carbon cycles of two steppes in Xilin River Basin were studied using biogeochemical cycle compartment theory. The major results include: 1) For the soil-palnt-atmosphere system of fenced Leymus chinensis steppe, the net carbon fixed by the plant compartment was 165.50 gC·m-2 during the growing season, the net emission from soil compartment was 174.36 gC·m-2,so the net carbon fixed by the system was -8.86 gC·m-2. In general, the input and output of carbon were nearly equivalent. The plant compartment was approximately balanced, too. 2) For the soil-plant-atmosphere system of fenced Stipa grandis steppe, the plant compartment fixed 130.04 gC·m-2 during the growing season, the net carbon emission from soil compartment was 128.28 gC·m-2, therefore the net carbon fixed by the system was 1.76 gC·m-2. The carbon input into plant compartment far exceeded the carbon output in wet year and it would become balanced in drought year. 3) The turnover of carbon element in Leymus chinensis steppe is larger than Stipa grandis steppe, which is caused by the more suitable geographical conditions. Water content is the main affecting factor of carbon cycles in Inner Mongolia steppe.

Key words: environmental science, carbon cycle, biogeochemistry, steppe

CLC Number: 

  • S812