Effects of Biological Soil Crust on Soil Respiration Characteristics in Sandy Shrubland in Inner Mongolia, China

  • 1. Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101;
    2. Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, Shaanxi 710075;
    3. Graduate University of the Chinese Academy of Sciences, Beijing 100049

Received date: 2010-02-18

  Revised date: 2010-04-16

  Online published: 2010-11-20


A two-year field experiment was carried out in Artemisia ordosica sandy shrubland in the Ordos Plateau of Inner Mongolia, China, in 2006-2007 using a static opaque chamber with an infrared CO2 gas analyzer technique. The effects of biological crust on the main characteristics of soil respiration and its sensitivity to the change of water-heat factors were analyzed. The results indicated that similar seasonal dynamic was found in the BSC and BG. The coefficients of variation (CVs) for soil respiration of BSC in different growing seasons ranged from 66.6% to 81.7%, higher than those of BG, which were in the range of 50.9%-76.5% for the same period, and the inert-annual CV of BSC (22.4%) was also higher than that of BG (8.0%). The existence of biological crusts enlarged the annual and inter-annual variation in soil respiration. The total soil respiration of different growing seasons for the BSC treatment were 126.88-186.07 g C/m2, significantly higher than those of 91.22-100.90 g C/m2 for the BG treatment. In the growing season, the soil respiration rates were significantly related to surface soil water contents, and the change of soil respiration rate was more sensitive to that of soil water contents in BSC than in BG for the two measured years. 81.3%, 53.2%, 57.8% and 55.4% of variation in soil respiration could be explained by the change in 0-10 cm soil water content for BSC and BG treatments in the two years, respectively.

Cite this article

QI Yu-chun, DONG Yun-she, JIN Zhao, XIAO Sheng-sheng, PENG Qin, HE Ya-ting, LIU Xin-chao . Effects of Biological Soil Crust on Soil Respiration Characteristics in Sandy Shrubland in Inner Mongolia, China[J]. SCIENTIA GEOGRAPHICA SINICA, 2010 , 30(6) : 898 -903 . DOI: 10.13249/j.cnki.sgs.2010.06.898


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