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Chinese Journal of Applied Ecology. 2010, (12) Core

Effects of compaction on diurnal variation of soil respiration in Larix gmellinii plantation in summerChinese Full Text

HE Na,WANG Li-hai,MENG Chun ( Heilongjiang Province Key Laboratory of Sustain- able Forest Management and Environment Microorganism Engineering,Northeast Forestry University, Harbin 150040,China)

Abstract: Taking the Larix gmellinii plantation in the experimental forest farm of Northeast Forestry University as test object,and by using Li-8100 automatic instrument,the daily CO2 emission rate of soil in summer under different degrees of man-made compaction was measured,with the regression models established. There were significant differences in the diurnal variation of soil respiration rate under different degrees of man-made compaction. In CK （ no compaction） ,the maximum value of soil respiration appeared at 15: 30-17: 30,and the minimum value appeared at 03: 30-05: 30, which were obviously lagged behind those in compaction treatments. The maximum and minimum values of soil respiration rate in main roads appeared at 09: 30-11: 30 and 23: 30 - 01: 30,and those in branch roads appeared at 11: 30 and 01: 30 - 03: 30,respectively. In all treatments,soil respiration rate had significant correlations with surface temperature,relative humidity,and the temperature at 10 cm soil depth,but the correlation with the soil moisture at 5 cm depth tended to be not significant when the compaction degree was increasing. Compaction altered surface soil physical structure,decreased surface soil CO2 release rate.
Keywords：

man-made compaction; soil respiration; Larix gmellinii plantation; soil temperature and moisture.;

  • DOI：

    10.13287/j.1001-9332.2010.0461

  • Series：

  • Subject：

  • Classification Code：

    S714

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