【摘要】：原始闊葉紅松林是我國溫帶典型的地帶性頂極植被類型,楓樺次生林是其典型的次生林類型之一,對二者土壤呼吸及其各組分特征的研究有助于準(zhǔn)確評價(jià)該地區(qū)的碳平衡。本研究主要測定了2013和2014年2個(gè)生長季原始闊葉紅松林和楓樺次生林土壤呼吸(RS),并量化了土壤呼吸的各個(gè)組分(異養(yǎng)呼吸RH和自養(yǎng)呼吸RA),與此同時(shí)測量了土壤10 cm處溫度以及土壤含水率。研究結(jié)果表明,土壤呼吸及其各組分有著明顯的季節(jié)變化特性,其大小的變化主要受溫度的影響,土壤10 cm處的溫度可以解釋RS64%~70%、RH56%~65%、RA77%~79%的變異。對于溫度的敏感性,原始闊葉紅松林土壤呼吸Q10值楓樺次生林土壤呼吸Q10值,而在單一林型中的比較,RAQ10值RSQ10值RHQ10值。此外,總體Q10值隨著季節(jié)有著明顯的變化,且隨著溫度的升高有降低的趨勢。原始闊葉紅松林和楓樺次生林RS年平均速率分別為3.92和4.06μmol·m~(-2)·s~(-1),RH年平均速率分別為2.97和2.85μmol·m~(-2)·s~(-1),RA年平均速率則分別為0.96和1.17μmol·m~(-2)·s~(-1)。原始闊葉紅松林土壤呼吸以及土壤土壤自養(yǎng)呼吸要稍低于楓樺次生林,而原始闊葉紅松林異養(yǎng)呼吸則高于楓樺次生林異養(yǎng)呼吸,但差異不顯著。原始闊葉紅松林和楓樺次生林RS平均年通量分別為942和971 g C·m~(-2)·a~(-1),RH年通量分別為709和677 g C·m~(-2)·a~(-1),RA年通量則分別為215和276 g C·m~(-2)·a~(-1)。原始闊葉紅松林RS年通量略高于楓樺次生林RS年通量,但差異不顯著。我們的實(shí)驗(yàn)結(jié)果表明,小興安嶺地區(qū)楓樺次生林正向演替的過程中,植被演替變化對土壤呼吸及各組分的影響并不明顯,相較于環(huán)境因子溫度和濕度要小的多。
[Abstract]:The primary broad-leaved Korean pine forest is a typical zonal climax vegetation type in temperate zone of China, and the secondary forest of Betula platyphylla is one of the typical secondary forest types. The study on the soil respiration and its components characteristics of the two forests is helpful to accurately evaluate the carbon balance in this area. In this study, the (RS), of soil respiration in the primary broadleaved Pinus koraiensis forest and the secondary birch forest in 2013 and 2014 were determined and the components of soil respiration (heterotrophic respiration RH and autotrophic respiration RA),) were quantified. At the same time, soil 10 was measured. Cm temperature and soil moisture content. The results showed that soil respiration and its components had obvious seasonal variation characteristics, and the variation of soil respiration and its components was mainly affected by temperature. The temperature at 10 cm of soil could explain the variation of RH5665 RH5665 RH56R7777779%. For the sensitivity of temperature, the soil respiration Q10 value of the original broad-leaved Korean pine forest was Q10 value, while the RHQ10 value of RAQ10 value was RSQ10 value in the single forest type. In addition, the total Q10 value changed obviously with the season and decreased with the increase of temperature. The annual average rate of RS was 3.92 渭 mol m ~ (-2) s ~ (-1) and 2.85 渭 mol m ~ (-2) s ~ (-1) RA in the primary broadleaved Korean pine forest and the secondary birch forest, respectively, and was 0.96 渭 mol m ~ (-2) s ~ (-1) in the primary broad-leaved Korean pine forest and 4.06 渭 mol m ~ (-2) s ~ (-1), respectively. Soil respiration and soil autotrophic respiration in the original broad-leaved Korean pine forest were slightly lower than those in the secondary forest, while the heterotrophic respiration in the original broad-leaved Korean pine forest was higher than that in the secondary birch forest, but the difference was not significant. The average annual RS fluxes of Pinus koraiensis and Betula platyphylla secondary stands were 942 and 971g cm ~ (-2) a ~ (-1), respectively, and the annual flux of RA were 709 and 677 g C m ~ (-2) a ~ (-1) RA, respectively, 215 and 276 g / cm ~ (-2) a ~ (-1), respectively. The annual RS flux of the original broad-leaved Korean pine forest was slightly higher than that of the secondary forest of Betula platyphylla, but the difference was not significant. Our experimental results show that the change of vegetation succession has little effect on soil respiration and components in the process of positive succession of Betula alanensis secondary forest in Xiaoxinganling area, and is much smaller than that of environmental factors such as temperature and humidity.
【作者單位】： 東北林業(yè)大學(xué)森林植物生態(tài)學(xué)教育部重點(diǎn)實(shí)驗(yàn)室;
【基金】：國家自然科學(xué)基金(31270494)~~
【分類號】：S714

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