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Bulletin of Botanical Research ›› 2017, Vol. 37 ›› Issue (2): 312-320.doi: 10.7525/j.issn.1673-5102.2017.02.021

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Comparative Study on the Soil Respiration and Component Characteristics of Primary Broad-leaved Korean Pine Forest and Betula costata Secondary Forest in Xiaoxing'an Mountatins,China

GENG Zhao-Peng, MAO Zi-Jun, HUANG Wei, HAN Ying-Ying   

  1. Key Laboratory of Forest Plant Ecology, Ministry of Education, Northeast Forestry University, Harbin 150040
  • Received:2016-05-11 Online:2017-03-15 Published:2017-03-11
  • Supported by:
    This study was fully supported by the National Natural Science Foundation of China(31270494)

Abstract: Primary broad-leaved Korean pine forest is a typical zonal climax vegetation type in the temperate zone of China. Betula costata secondary forest is one of its typical secondary forests. The study on soil respiration and the characteristics of the components of the primitive broad-leaved Korean pine forest and B.costata secondary forest will be helpful in gaining insight into Xiaoxing'an Mountains spatial and temporal distribution characteristics of carbon source and sink as well as its main influence factors. The final end is to accurately evaluate the carbon balance of this region. We tested the soil respiration(RS) of Primary broad-leaved Korean pine forest and B.costata secondary forest in 2013 and 2014, adopted procedure of quantization in the test of soil respiration components(heterotrophic respiration RH, autotrophic respiration RA), and surveyed the soil temperature and soil moisture at 10 cm of the soil. The soil respiration and its main components feature obvious seasonal variation, which is mainly influenced by temperature. The temperature at the depth of 10 cm of the soil can explain the variation of RS of 64%-70%, RH of 56%-65%, and RA of 77%-79%. As for the temperature sensitivity, primary broad-leaved Korean pine forest's Q10 value of soil respiration>B.costata secondary forest Q10 value of soil respiration. While in the comparison of a single forest, Q10 of RA > Q10 of RS > Q10 of RH. The general Q10 value presents obvious seasonal changes and the value decreases with the rise in temperature. The average soil respiration of RS of the primitive broad-leaved Korean pine forest and the B.costata secondary forest are 3.92 and 4.06 μmol·m-2·s-1, respectively, the average soil respiration of RH are 2.97 and 2.85 μmol·m-2·s-1, respectively, while the average soil respiration of RA are 0.96 and 1.17 μmol·m-2·s-1, respectively. The average annual flux of RS of the primitive broad-leaved Korean pine forest and the B.costata secondary forest are 942 and 971 m-2·a-1 C, respectively; the average annual flux of RH are 709 and 677 m-2·a-1 C, respectively, while the average annual flux of RA are 215 and 276 m-2·a-1 C, respectively. The average annual flux of RS of Primary broad-leaved Korean pine forest is higher than that of B.costata secondary forest, but the differences are not significant. The area of Xiaoxing'an Mountains is in the succession process of B.costata secondary forest, vegetation succession influence on soil respiration and its components is not obvious, and compared with environmental factor the temperature and humidity is much smaller.

Key words: succession, Primary broad-leaved Korean pine forest, Betula costata secondary forest, soil respiration, heterotrophic respiration, autotrophic respiration

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