高寒森林不同生境对凋落叶分解灰分动态的影响

发布时间：2018-06-29 19:29

  本文选题：凋落叶分解 + 溪流　； 参考：《生态学报》2017年09期

【摘要】：灰分是凋落叶的重要组成部分,其浓度直接关系到凋落叶的分解过程及有机组分的动态特征,且可能受生境和分解时期的影响,然而有关凋落叶分解过程中灰分动态的研究鲜有报道。采用凋落袋法,以岷江上游高寒森林4种代表性植物康定柳(Salix paraplesia)、高山杜鹃(Rhododendron lapponicum)、方枝柏(Sabina saltuaria)和四川红杉(Larix mastersiana)凋落叶为研究对象,研究了高寒森林凋落叶在3种不同环境条件下(林下、溪流、河岸带)分解过程中灰分的动态特征。结果表明,灰分量随凋落叶的分解整体呈现降低的趋势,且不同环境条件和不同物种之间存在明显的差异。与之相反,经过两年的分解,除溪流中康定柳凋落叶灰分浓度略有下降外(-0.99%),林下和河岸带中康定柳凋落叶及其它物种凋落叶中灰分浓度在所有环境条件下均表现出了增加的趋势(5.86%—72.15%)。凋落叶分解过程中灰分浓度变异量在不同分解时期存在明显或显著的差异,且受物种和环境因子的调控。这些结果表明,传统上认为凋落叶分解过程中灰分浓度比较稳定的观点是不准确的,且以凋落叶分解过程中灰分浓度不变的前提下采用无灰分质量损失(ash free mass loss)而计算凋落叶质量损失的方法存在一定的不准确性。研究为认识凋落叶分解过程中灰分的动态特征及凋落叶质量损失的测定方法提供了一定的参考。
[Abstract]:Ash is an important component of litter, and its concentration is directly related to the decomposition process and the dynamic characteristics of organic components, and may be affected by habitat and decomposition period. However, there are few reports on ash dynamics during leaf decomposition. The litter bag method was used to study the withered leaves of four representative plants, Salix paraplesia), lapponicum), (Sabina saltuaria) and Sequoia chinensis (Larix mastersiana) in the upper reaches of Minjiang River. The dynamic characteristics of ash content in the decomposition process of leaf litter in alpine forest under three different environmental conditions (forest, stream, riparian zone) were studied. The results showed that the grey component decreased with the decomposition of litter leaves, and there were obvious differences among different environmental conditions and species. In contrast, after two years of decomposition, Except for the slight decrease of ash concentration (-0.99%) in the littered leaves in the stream, the ash concentration in the littered leaves and leaves of other species showed an increasing trend (5.86- 72.15%) in the understory and riparian zones. The variation of ash concentration was significantly different in different decomposition stages, and was regulated by species and environmental factors. These results suggest that the traditional view that ash concentration is more stable during leaf decomposition is inaccurate. There was some inaccuracy in calculating the weight loss of littered leaves by using (ash free mass loss) without ash loss under the premise of constant ash concentration during leaf litter decomposition. The study provides a reference for the understanding of the dynamic characteristics of ash content in the process of litter decomposition and the method for determining the mass loss of littered leaves.
【作者单位】： 四川农业大学生态林业研究所林业生态工程省级重点实验室高山森林生态系统定位研究站;长江上游生态安全协同创新中心;四川师范大学生命科学学院;
【基金】：国家自然科学基金(31270498,31570445,31500358) 高等学校博士学科点专项科研基金(20135103110002)
【分类号】：S714
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本文编号：2083128