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Microclimate regimes following gap formation in a montane secondary forest of eastern Liaoning Province, China

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Abstract

In order to improve the understanding of the role of a canopy opening/gap on the physical environments in a secondary forest in Northeastern China, a case study was conducted in and around a small irregular gap in a montane secondary forest. The secondary forest, which was severely disturbed by human beings about 50 years ago, was dominated by Quercus mongolica and Fraxinus rhynchophyllaan. Temporal variation in photosynthetic photon flux density (PPFD), air temperature (T A) at 10 cm above the ground, soil temperature (T S) and soil water content (SWC) at top-layer (0–15 cm) and sub-layer (15–30 cm) were measured from May to September after the second year since the formation of the small gap (the ratios of gap diameter to stand height were less than 0.5) in 2006 respectively. Results indicated that the highest value of PPFD occurred at the northern edge of the gap, particularly at the beginning of the growing season in May. On sunny days, the highest value of PPFD appeared earlier than that on overcast days. Maximum and mean values of T A were higher in the northern part of the gap, and the minimum values of T A were at the southern edge of the gap. Soil temperature varied obviously in the gap with the range from 1 to 8 °C. Maximum values of T S occurred at the northern part of the gap, which was significantly correlated with the maximum values of T A (R = 0.735, P<0.05). SWC was higher in the top-layer (0–15 cm) than that in sub-layer (15–30 cm), but the difference of them was not significant (p>0.05), which might be attributed to the small gap size and the effects of aboveground vegetations. From these results, the maximum of PPFD in the study area occurred at the northern part of the gap, which was consistent with the results observed in north hemisphere, but the occurrence time varied with the differences of the latitudes. The highest values of air and soil temperatures also occurred in the northern part of the gap because they were affected by the radiation. However, the variation of temperature in July was different from other months due to the influence of gap size. And the values of soil water content were neither higher in the gap in the wet season nor lower in the dry season, which might be affected by the gap size and topography the gap located. The variations of light, soil and air temperatures, and soil moisture in this small irregular gap might be related to the effects of the micro-site, which affects the regeneration of plant species.

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Authors and Affiliations

  1. Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, 110016, P. R. China

    Zhu Jiao-jun, Tan Hui, Li Feng-qin, Chen Mei & Zhang Jin-xin

  2. Graduate University of Chinese Academy of Sciences, Beijing, 100039, P. R. China

    Tan Hui

  3. University of Engineering & Technology, Liaoning Province, Fuxin, 123000, P. R. China

    Chen Mei

Authors
  1. Zhu Jiao-jun
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  2. Tan Hui
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  3. Li Feng-qin
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  4. Chen Mei
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  5. Zhang Jin-xin
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Correspondence to Zhu Jiao-jun.

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Foundation project: This research was supported by National Natural Science Foundation of China (30671669) and “the 100-Young-Researcher Project” of Chinese Academy of Sciences.

Biography: ZHU Jiao-jun (1965–), male, Professor in Institute of Applied Ecology, Chinese Academy of Sciences.

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Zhu, Jj., Tan, H., Li, Fq. et al. Microclimate regimes following gap formation in a montane secondary forest of eastern Liaoning Province, China. J. of For. Res. 18, 167–173 (2007). https://doi.org/10.1007/s11676-007-0035-7

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  • DOI: https://doi.org/10.1007/s11676-007-0035-7

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