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1、网络出版时间：2015-10-1610:57:35网络出版地址：http://www.cnki.net/kcms/detail/21.1253.q.20151016.1057.018.html*川西高山林线交错带凋落叶分解速率与初始质量的关系**杨林邓长春陈亚梅和润莲张健刘洋(四川农业大学生态林业研究所/四川省生态林业工程重点实验室/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,成都611130)摘要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
2、凋落叶分解较慢,灌木凋落叶次之,草本凋落叶分解最快.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凋落叶分解速率k值变异的78.4%,其中木质素/N可以解释k变异的69.5%,木质素/N对k的直接通径系数为-0.913.主成分分析表明,第1排序轴对分解速率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k的关键质量指标
3、,且凋落叶初始木质素/N越高,分解速率越低.关键词高山林线交错带;分解速率;凋落叶;初始质量;木质素/N文章编号中图分类号Q149文献标识码ARelationshipsbetweendecompositionrateofleaflittersandinitialqualityacrossthealpinetimberlineecotoneinWesternSichuan,China.YANGLin,DENGChang-chun,CHENYa-mei,HERun-lian,ZHANGJian,LIUYang(InstituteofEcology&Forestry,Si
4、chuanAgriculturalUniversity/SichuanProvinceKeyLaboratoryofEcologicalForestryEngineering/Long-termResearchStationofAlpineForestEcosystems/CollaborativeInnovationCenterofEcologicalSecurityintheUpperReachesofYangtzeRiver,Chengdu611130,China)Abstract:Therelationshipsbetweenlitterdecomposit
5、ionrateandtheirinitialqualityof14representativeplantsinthealpineforestecotoneofwesternSichuanwereinvestigatedinthispaper.Thedecompositionratekoftherepresentativeplantlittersrangedfrom0.16to1.70.Woodyleaflittersandmosslittersdecomposedmuchslower,andshrubbylittersdecomposedalittlefaster.
6、Then,herbaceouslittersdecomposedfastestamongallplantforms.ThereweresignificantlinearregressionrelationshipsbetweenthelitterdecompositionrateandtheNcontent,lignincontent,phenolicscontent,C/N,C/Pandlignin/N.Lignin/Nandhemicellulosecontentcouldexplain78.4%variationofthelitterdecomposition
7、rate(k)bypathanalysis.Thelignin/Ncouldexplain69.5%variationofkalone,andthedirectpathcoefficientoflignin/Nonkwas-0.913.Principalcomponentanalysis(PCA)showedthatthecontributionrateofthefirstsortaxistothedecompositionrate(k)andthedecompositiontime(t)reached99.2%,.Significantpositivecorr
