JOURNAL OF NATURAL RESOURCES ›› 2014, Vol. 29 ›› Issue (11): 1944-1956.doi: 10.11849/zrzyxb.2014.11.012

• Resource Evaluation • Previous Articles     Next Articles

Effect of Different Land Use Patterns on Seasonal Dynamic of Soil Microbial Biomass Carbon in the Subalpine Forest of Western Sichuan, China

ZHOU Yi-gui1, HAO Kai-jie1,2, LI Xian-wei1, FAN Chuan1, CHEN Yue-lin1, WANG Xie1, WANG Xiao-hong1   

  1. 1. Forestry Ecological Engineering in Upper Reaches of Yangtze River Key Laboratory of Sichuan Province, Sichuan Agricultural University, Ya'an 625014, China;
    2. Forestry Research Institute of Shanxi Province, Taiyuan 030012, China
  • Received:2014-02-22 Revised:2014-05-24 Online:2014-11-20 Published:2014-11-20

Abstract:

During the 1950s and 1960s, the forest had been greatly reduced and degraded, as a long-term over-logging on a large scale, and then, there were many different patterns of plantations and secondary forest. In this paper, in order to assess the effect of land use change on soil organic carbon (SOC) and soil microbial biomass carbon (SMBC), soil samples were taken from primeval Abies spp. forest, Picea spp. forest, Picea spp.+ Betula albo-sinensis mixed forest, shrub forest, converted cropland to Picea spp. forest, grassland, at the same time, slope farmland was set as CK, and their SOC, SMBC contents of different seasons in soil surface (0- 15 cm) and subsurface (15-30 cm) were determined. The results showed that the contents of SOC and SMBC in soil surface were significantly higher than subsurface (P<0.05) under each land use pattern; the content of SOC was the highest in winter, the second highest in summer, the lowest in autumn, but the dynamics of SMBC were opposite to the varies of SOC. The effect of land use on SOC and SMBC contents were very significant, the contents of SOC and SMBC under CK were the lowest in each season. In soil surface, the annual mean content of SOC under CK was only 23.55%, 29.44%, 33.12%, 43.94%, 58.13% and 67.63% of primeval Abies spp. forest, shrub forest, grassland, Picea spp.+ Betula albo-sinensis mixed forest, converted cropland to Picea spp. forest and Picea spp. forest, in soil subsurface the percentages were 18.02%, 27.30%, 32.93%, 40.74%, 55.26% and 58.10%; and the annual mean content of SMBC under CK was only 20.50%, 23.23%, 30.63%, 36.48%, 46.22% and 59.07% of primeval Abies spp. forest, shrub forest, grassland, Picea spp. forest, Picea spp.+ Betula albo-sinensis mixed forest and converted cropland to Picea spp. forest, in soil subsurface the percentages were 25.66%, 35.65%, 40.23%, 43.63%, 55.34% and 66.71%. With the effect of land use, the seasonal dynamics of qSMB were the same as the SMBC content and the opposite to the SOC content, but the order were not obvious.

Key words: soil organic carbon, qSMB, land use pattern, soil microbial biomass carbon

CLC Number: 

  • S718.55