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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.
In order to analyze the quality loss of the decomposition of the Phyllostachys pubescens residues and the alpine cold fern litter in the coniferous forest and the Pinus massoniana forest, The results showed that the mass loss rate of both Spirodela sinica and P. alpine was higher than that of the coniferous forest in both the snowy and the growing seasons, but the enzyme activities were significantly higher in the coniferous forest Higher than the forest line.The quality loss of the two kinds of ground cover was significantly different in different seasons, and the quality loss rate of Chrysanthemum morifolium in snow-covered forest and coniferous forest accounted for 69.8% and 83.0% of the whole year respectively. The mass loss rate of Alpine cold fern in coniferous forest accounted for 82.6% and 83.4% of the whole year respectively. Litter leaf of Alpine fern rapidly decomposed in the growing season, which was consistent with the higher cellulase activity at the end of growing season, indicating that cellulose and Hemicellulose digestion may be the main reason for the early mass loss of litter.Multiple linear regression analysis showed that the environmental factors and the initial mass of litter can jointly explain the enzyme activity variation of 45.8% to 85.1%, two kinds of ground material decomposition In the process of enzyme activity mainly by the snow is frozen The impact cycle.