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《Acta Botanica Boreali-Occidentalia Sinica》 2010-05
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Decomposition Characteristics of Withered Leaves at Different Altitudes on South Slope of the Qinling Mountains

HE Fan1,WANG De-xiang1,LEI Rui-de1,WANG Jing2,WANG Yu-chao1,LIU Jin-hu1(1 College of Forestry,Northwest A&F University,Yangling,Shaanxi 712100,China;2 Tanggu Environmental Protection Bureau,Tianjin 300450,China)  
By the litter bag technique,a comparative study about the release rule of calorific value of N,P,C,crude fiber and crude fat in the litter decomposition process of four species,Pinus armandii,P.tabulaeformis,Quercus aliena var.acuteserrata and Larix principis-rupprechtii,at different altitudes in Qinling Mountain was conducted.The results showed that there was no significant difference in the content of N,P,C,crude fat and heat value during litter decomposition of the same stands among different altitudes(P0.05).During the one year's decomposition,the contents of N and P in withered leaves concentrated gradually,and the concentration speed of P.tabulaeformis was the fastest,which was 165.60% and 189.94% respectively.The contents of C,crude fat,heat value,C/N,C/P and crude fiber/N decreased gradually during the decomposition process,and the release rate of crude fat reached 50.29%~77.82%.After one year's decomposition,the difference in the contents of N,P,C,C/N and C/P of withered leaves among different altitudes were still not significantly different(P0.05).But the altitude differences had significant influence on crude fat,decomposition of crude fiber and calorific value of withered leaves:the difference in the decomposition of crude fiber in withered leaves among different altitudes was extremely significantly different(P0.01).The maximum difference was in the release of crude fat between the withered leaves of Quercus aliena var.acuteserrata at low altitude and high altitude,and the former was 19.38% higher than that of the latter.The difference in the crude fiber release of withered leaves between Larix principis-rupprechtii and Quercus aliena var.acuteserrata at different altitudes was extremely significantly different(P0.01),but the difference between P.armandii and P.tabulaeformis was not significantly different.The heat value of withered leaves of Quercus aliena var.acuteserrata at high and low altitudes were 17.74 and 13.51 kJ·g-1 respectively,which means the differences were extremely significantly different,while the differences between P.armandii,P.tabulaeformis and Larix principis-rupprechtii were significantly different.The research showed that the differences in precipitation and temperature caused by altitude variation had no significant impact on the N,P and C release of each kind of withered leaves,but had significant influence on crude fat,calorific value and crude fiber/N during the one year's decomposition.
【Fund】: 典型区域森林生态系统健康维护与经营技术研究(200804022B);; 陕西宁夏省区森林生态系统服务功能定位观测与评估技术项目(200704005/wb06);; 中国森林生态质量状况评估与报告技术(2006BAD03A0702)
【CateGory Index】: S714
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