川西高山林线交错带两种地被物分解的木质纤维素酶活性特征  

Litter decomposition and lignocellulose enzyme activities of Actinothuidium hookeri and Cystopteris montana in alpine timberline ecotone of western Sichuan,China

作　　者：陈亚梅[1] 和润莲 邓长春[1] 杨万勤[1] 张健[1] 杨林[1] 刘洋[1] 

机构地区：[1]四川农业大学生态林业研究所,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,成都611130

出　　处：《应用生态学报》2015年第11期3251-3258,共8页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金项目(31570605,31200345);国家“十二五”科技支撑计划项目(2011BAC09B05);教育部博士点基金项目(20115103120003)资助

摘　　要：以川西高山林线交错带两种优势地被物锦丝藓和高山冷蕨为对象,对针叶林和林线中锦丝藓植物残体及高山冷蕨凋落叶分解的质量损失和木质纤维素酶活性特征进行研究.结果表明：锦丝藓和高山冷蕨的质量损失率在雪被期和生长季均表现为林线高于针叶林,而酶活性整体上表现为针叶林显著高于林线.两种地被物不同季节的质量损失有显著差异,雪被期林线和针叶林的锦丝藓质量损失率占全年的69.8%和83.0%;生长季林线和针叶林的高山冷蕨质量损失率分别占全年的82.6%和83.4%.高山冷蕨凋落叶在生长季节快速分解,与其生长季节末较高的纤维素酶活性相吻合,说明纤维素和半纤维素的酶解作用可能是凋落物前期质量损失的主要原因.多元线性回归分析表明,环境因子和凋落叶初始质量能共同解释酶活性变异的45.8%-85.1%,两种地被物分解过程中酶活性主要受到雪被期冻融循环的影响.The mass loss and lignocellulose enzyme activities of Actinothuidium hookeri residues and Cystopteris montana leaf litter in coniferous forest and timberline of western Sichuan,China were investigated. The results showed that both the mass loss rates of A. hookeri and C. Montana in timberline were higher than those in coniferous forest,while enzyme activities in timberline were lower than those in coniferous forest which was contrast with the hypothesis. The mass loss of two ground covers had significant differences in different seasons. The mass loss rate of A. hookeri in snowcovered season accounted for 69. 8% and 83. 0% of the whole year＇s in timberline and coniferous forest,while that of C. montana in the growing season accounted for 82.6% and 83.4% of the whole year＇s in timberline and coniferous forest,respectively. C. montana leaf litter decayed faster in the growing season,which was consistent with its higher cellulase activity in the growing season. The result illustrated that the enzymatic hydrolysis of cellulose and hemicellulose might be the main driving force for the early stage of litter decomposition. Multiple linear regression analysis showed that environmental factors and initial litter quality could explain 45.8%-85.1% variation of enzyme activity.The enzyme activities of A. hookeri and C. montana in the process of decomposition were mainly affected by the freeze-thaw cycle in snow-covered season.

关 键 词：木质纤维素酶 质量损失 高山林线交错带 锦丝藓 高山冷蕨 

分 类 号：S714[农业科学—林学]