Effects of forest age on soil autotrophic and heterotrophic respiration differ between evergreen and deciduous forests.
Effects of forest age on soil autotrophic and heterotrophic respiration differ between evergreen and deciduous forests.
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森林年龄对常绿林和落叶林土壤自养和异养呼吸的影响不同
DOI：
10.1371/journal.pone.0080937
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发表时间：
2013
期刊：
影响因子：
3.7
通讯作者：
Zeng H
中科院分区：
文献类型：
--
作者：
Wang W;Zeng W;Chen W;Yang Y;Zeng H
研究了林龄对两种森林类型土壤呼吸的影响，包括异养呼吸和自养呼吸。我们测量了土壤呼吸和划分HR和AR组件在三个年龄级15，125，135年生樟子松。蒙古松（Mongolica）和华北落叶松（Larix principis-rupprechtii）在中国北方森林-草原交错带的研究（2006年6月至2009年10月）。分析了土壤温度、土壤含水量和归一化植被指数（NDVI）与SR、HR、AR季节动态的关系。我们的研究结果表明，ST和SWC的季节动态SR，而不是植物绿度的驱动因素，不论林分年龄和森林类型。对于15年生林分，AR和HR的季节动态都依赖于ST。与AR相比，落叶松HR的Q10较高。然而，在蒙古松，类似的Q10发生在HR和AR之间。随着林龄的增加，落叶松HR和AR的Q10值均增加。随着林龄的增加，樟子松HR与SWC呈显著正相关，而落叶松AR与SWC呈显著正相关。35年生樟子松的AR对NDVI存在依赖性。我们的研究表明，在刺激土壤碳排放对环境变化的响应时，分离SR的自养和异养呼吸组分的重要性。在估计自养和异养呼吸对环境变化的反应时，需要考虑森林类型对与年龄有关的趋势的影响。
We examined the effects of forest stand age on soil respiration (SR) including the heterotrophic respiration (HR) and autotrophic respiration (AR) of two forest types. We measured soil respiration and partitioned the HR and AR components across three age classes ∼15, ∼25, and ∼35-year-old Pinus sylvestris var. mongolica (Mongolia pine) and Larix principis-rupprechtii (larch) in a forest-steppe ecotone, northern China (June 2006 to October 2009). We analyzed the relationship between seasonal dynamics of SR, HR, AR and soil temperature (ST), soil water content (SWC) and normalized difference vegetation index (NDVI, a plant greenness and net primary productivity indicator). Our results showed that ST and SWC were driving factors for the seasonal dynamics of SR rather than plant greenness, irrespective of stand age and forest type. For ∼15-year-old stands, the seasonal dynamics of both AR and HR were dependent on ST. Higher Q10 of HR compared with AR occurred in larch. However, in Mongolia pine a similar Q10 occurred between HR and AR. With stand age, Q10 of both HR and AR increased in larch. For Mongolia pine, Q10 of HR increased with stand age, but AR showed no significant relationship with ST. As stand age increased, HR was correlated with SWC in Mongolia pine, but for larch AR correlated with SWC. The dependence of AR on NDVI occurred in ∼35-year-old Mongolia pine. Our study demonstrated the importance of separating autotrophic and heterotrophic respiration components of SR when stimulating the response of soil carbon efflux to environmental changes. When estimating the response of autotrophic and heterotrophic respiration to environmental changes, the effect of forest type on age-related trends is required.
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影响因子：
2.7
作者：
Hasselquist, Niles J.;Allen, Michael F.;Santiago, Louis S.
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Read, DJ
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Thomson, Allison
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