高山林线交错带高山杜鹃的凋落物分解

被引：43

作者：

邓长春 ^{[1
]}

蒋先敏 ^{[2
]}

刘洋 ^{[1
]}

张健 ^{[1
]}

陈亚梅 ^{[1
]}

和润莲 ^{[1
]}

机构：

[1] 四川农业大学生态林业研究所/林业生态工程重点实验室

[2] 四川省阿坝州川西林业局

来源：

生态学报 | 2015年 / 35卷 / 06期

关键词：

凋落物分解; 林线交错带; 高山杜鹃; 气候变暖; 雪被;

D O I：

暂无

中图分类号：

S685.21 [杜鹃花];

学科分类号：

090204 [观赏园艺学];

摘要：

凋落物分解是维持生态系统生产力、养分循环、土壤有机质形成的关键生态过程。高山林线交错带是陆地生态系统中对气候变化响应的敏感区域。季节变化和海拔梯度上的植被类型差异可能会影响该区域凋落物的分解,进而对高山生态系统的碳氮循环产生重要影响。采用凋落物分解袋的方法,研究了川西高山林线交错带优势种高山杜鹃(Rhododendron lapponicum)凋落叶在雪被期和生长季的分解特征。结果显示:(1)季节变化和植被类型对高山杜鹃凋落物的分解均具有显著影响(P<0.05),凋落叶的质量损失主要发生在生长季且在高山林线最大,暗针叶林中雪被期的质量损失略高于生长季,但差异不显著;(2)林线交错带上高山杜鹃凋落叶分解缓慢,一年干物质失重率为9.62%,拟合分解系数k为0.145;(3)高山杜鹃凋落叶的质量变化主要体现在纤维素降解显著且集中在雪被期,木质素无明显降解,在高山林线上C/N、C/P、木质素/N变化幅度较小且C、N、P的释放表现得稳定而持续。结果表明,季节性雪被对林线交错带内高山杜鹃分解的影响不仅局限在雪被期内,雪被融化期间频繁的冻融作用和雪融水淋洗作用可能会促进高山杜鹃凋落物在生长季初期的分解。总的来看,在气候变暖的情景下,雪被的缩减、生长季的延长和高山杜鹃群落的扩张可能加速高山林线交错带高山杜鹃凋落物的分解。

引用

页码：1769 / 1778

页数：10

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