锐齿栎林及其皆伐迹地休眠季土壤呼吸特征

doi:10.11707/j.1001-7488.20131101

Abstract

Abstract:

By using a Li-6400 portable photosynthesis system with a soil chamber, the diurnal and monthly dynamics of soil respiration rate was measured in a Sharptooth Oak forest (Quercus aliena var. acuteserrata, served as control site) and its clear-cutting site in Xiaolong Mountain within the dormant season from November 2011 to March 2012 in order to investigate influences of the soil temperature and moisture on the soil respiration rate, and to estimate the soil carbon fluxes in the Sharptooth Oak forest and its clear-cutting site. The results showed that the daily variation in the soil respiration rate in clear-cutting site was greater than that in control site within the dormant season except February, but the mean value of the soil respiration rate in clear-cutting site was 0.45 μmol CO₂·m^-2s^-1, smaller (P<0.05) than that of the control of 0.60 μmol CO₂·m^-2s^-1. Regardless for the single and double factor models, the determination coefficients of fitting models for the control site were higher than that for clear-cutting site. With the double factor model, changes of the soil respiration rate could be explained 81.5% and 82.0% by the soil temperature and moisture at 5, 10 cm depth in clear-cutting site, respectively, and could be explained 92.8% and 89.0% by them at the same depth in control site, respectively. In the dormant period, the soil carbon effluxes in the clear-cutting site and the control site (forest land) were estimated to be 86.4 and 106.8 gC·m^-2, respectively.

Key words: Quercus aliena var. acuteserrata, clear-cutting site, dormant period, soil respiration, soil temperature, soil volumetric moisture

CLC Number:

S718.51

Xia Guowei, Kang Jin, Zhou Wei, Zhang Songzhi, Kang Yongxiang. Characteristics of Soil Respiration in Quercus aliena var. acuteserrata Forest and Its Clear-Cutting Site in Dormant Period[J]. Scientia Silvae Sinicae, 2013, 49(11): 1-8.

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Characteristics of Soil Respiration in Quercus aliena var. acuteserrata Forest and Its Clear-Cutting Site in Dormant Period

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