论文部分内容阅读
对我国川西高山林线交错带14种代表性植物凋落叶分解速率与初始质量的关系进行研究.结果表明:高山林线交错带植物凋落叶分解速率(k)为0.16~1.70,乔木和苔藓凋落叶分解较慢,灌木凋落叶次之革本凋落叶分解最快.凋落叶分解速率与N、木质素、酚类物质、C/N、C/P、木质素/N均具有显著的线性回归关系.通径分析得出,木质素/N和半纤维素含量可以解释k变异的78.4%,其中木质素/N可以解释k变异的69.5%,木质素/N对κ的直接通-径系数为-0.913.主成分分析表明,第1排序轴k、分解时间(t)的贡献率达99.2%,木质素/N、木质素含量、C/N、C/P与第1排序轴呈显著正相关,其中木质素/N与第1排序轴的相关关系最强(r=0.923).木质素/N是影响川西高山林线交错带植物凋落叶分解速率的关键质量指标且凋落叶初始木质素/N越高分解速率越低.
The relationship between litter decomposition rate and initial mass of 14 typical plantations in the ecotone between western Sichuan and western China was studied. The results showed that the litter decomposition rate (k) was 0.16-1.70, Litter decomposition was slower and the litter leaf litter decomposition was the fastest, and the litter decomposition rate had significant linear regression with N, lignin, phenols, C / N, C / P and lignin / N The results of path analysis showed that the content of lignin / N and hemicellulose could account for 78.4% of k variation, of which lignin / N could account for 69.5% of k variation, and the direct pass-path coefficient of lignin / N for kappa Was -0.913. The principal component analysis showed that the contribution rate of the first order axis k, decomposition time (t) was 99.2%, and the lignin / N, lignin content, C / N, C / (R = 0.923) .The lignin / N is the key quality index that affects the litter decomposition rate of the plantation in the ecotone of alpine forest in western Sichuan, and the lignin / The higher the elemental / N the lower the rate of decomposition.