小兴安岭原始阔叶红松林与枫桦次生林土壤呼吸及其各组分特征的比较研究

发布时间：2018-07-23 13:46

【摘要】：原始阔叶红松林是我国温带典型的地带性顶极植被类型,枫桦次生林是其典型的次生林类型之一,对二者土壤呼吸及其各组分特征的研究有助于准确评价该地区的碳平衡。本研究主要测定了2013和2014年2个生长季原始阔叶红松林和枫桦次生林土壤呼吸(RS),并量化了土壤呼吸的各个组分(异养呼吸RH和自养呼吸RA),与此同时测量了土壤10 cm处温度以及土壤含水率。研究结果表明,土壤呼吸及其各组分有着明显的季节变化特性,其大小的变化主要受温度的影响,土壤10 cm处的温度可以解释RS64%~70%、RH56%~65%、RA77%~79%的变异。对于温度的敏感性,原始阔叶红松林土壤呼吸Q10值枫桦次生林土壤呼吸Q10值,而在单一林型中的比较,RAQ10值RSQ10值RHQ10值。此外,总体Q10值随着季节有着明显的变化,且随着温度的升高有降低的趋势。原始阔叶红松林和枫桦次生林RS年平均速率分别为3.92和4.06μmol·m~(-2)·s~(-1),RH年平均速率分别为2.97和2.85μmol·m~(-2)·s~(-1),RA年平均速率则分别为0.96和1.17μmol·m~(-2)·s~(-1)。原始阔叶红松林土壤呼吸以及土壤土壤自养呼吸要稍低于枫桦次生林,而原始阔叶红松林异养呼吸则高于枫桦次生林异养呼吸,但差异不显著。原始阔叶红松林和枫桦次生林RS平均年通量分别为942和971 g C·m~(-2)·a~(-1),RH年通量分别为709和677 g C·m~(-2)·a~(-1),RA年通量则分别为215和276 g C·m~(-2)·a~(-1)。原始阔叶红松林RS年通量略高于枫桦次生林RS年通量,但差异不显著。我们的实验结果表明,小兴安岭地区枫桦次生林正向演替的过程中,植被演替变化对土壤呼吸及各组分的影响并不明显,相较于环境因子温度和湿度要小的多。
[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.
【作者单位】：东北林业大学森林植物生态学教育部重点实验室;
【基金】：国家自然科学基金(31270494)~~
【分类号】：S714

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