摘要
采用野外放置凋落物分解袋法,对秦岭南坡林区不同海拔华山松（Pinus armandii）、油松（P.tabulaefor-mis）、锐齿栎（Quercus alienavar.acuteserrata）和华北落叶松（Larix principis-rupprechtii）凋落叶分解过程中N、P、C、粗脂肪、粗纤维和热值的变化规律进行比较研究.结果表明：（1）处于不同海拔的同一树种新鲜凋落叶的N、P、C、粗脂肪含量及其热值差异不显著（P〉0.05）.（2）在一年的分解过程中,凋落叶N、P含量表现出逐渐富集的趋势,其中油松凋落叶N、P富集速度最快,分别达到165.60%和189.94%;凋落叶C、粗脂肪含量和热值、C/N、C/P、粗纤维/N在分解中逐渐下降,粗脂肪释放速率达到50.29%~77.82%.（3）分解一年后,不同海拔同一树种凋落叶N、P、C、C/N、C/P含量仍未表现出显著性差异（P〉0.05）,但不同海拔凋落叶粗脂肪分解表现出极显著差异（P〈0.01）,其中差距最大的锐齿栎凋落叶低海拔较高海拔粗脂肪释放率高19.38%;不同海拔华北落叶松和锐齿栎凋落叶粗纤维释放速率差异极显著（P〈0.01）,而不同海拔油松、华山松凋落叶粗纤维释放无显著差异;处于高低海拔的华北落叶松和锐齿栎凋落叶热值分别为17.12和15.68 kJ·g-1、17.74和13.51 kJ·g-1,表现出极显著差异（P〈0.01）,油松、华山松凋落叶表现出显著差异（P〈0.05）.研究发现,一年中海拔差异所造成的降水、温度等因素的变化对各树种凋落叶中N、P、C的释放无显著影响,但对凋落叶分解过程中粗脂肪、热值、粗纤维/N的变化影响显著.
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 ext
出处
《西北植物学报》
CAS
CSCD
北大核心
2010年第5期1004-1011,共8页
Acta Botanica Boreali-Occidentalia Sinica
基金
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)
关键词
森林凋落叶
分解
物质循环
海拔
withered leaves in forests
decomposition
circulation of substances
altitude
