模拟增温和不同凋落物基质质量对凋落物分解速率的影响  

Effects of simulated temperature increase and vary little quality on litter decomposition

作　　者：刘瑞鹏[1] 毛子军[1] 李兴欢[1] 孙涛[1] 李娜[1] 吕海亮[1] 刘传照[2] 

机构地区：[1]东北林业大学森林植物生态学教育部重点实验室,哈尔滨150040 [2]东北林业大学凉水国家级自然保护区,伊春153000

出　　处：《生态学报》2013年第18期5661-5667,共7页Acta Ecologica Sinica

基　　金：国家"973"重点基础研究项目发展计划项目(2010CB951301);国家自然科学基金项目(31270494;31070350)

摘　　要：采用凋落物分解袋法,研究了在土壤、水分相当的条件下模拟增温对红松(Pinus koraiensis)、蒙古栎(Quercus mongolica)及其混合凋落物分解的影响,以及在不同温度水平下,不同凋落物质量(两种单一凋落物和混合凋落物)的分解特性。利用碱式吸收法测量了凋落物分解累积释放CO2动态。将N浓度和C/N率作为凋落物质量参数,用呼吸产生CO2的积累值和凋落物质量损失率确定凋落物分解率。结果表明温度升高对单一凋落物和混合凋落物分解均有促进作用,在不同温度水平上,不同质量凋落物的分解特性有所差别,25℃和29℃条件下混合凋落物分解速率>蒙古栎单一凋落物>红松单一凋落物分解速率。然而,在31℃条件下混合凋落物与蒙古栎单一凋落物分解速率相差不大,二者均大于红松单一凋落物分解速率。Litter decomposition is a fundamental process to ecosystem functioning being responsible of carbon and nutrient cycling. The decomposition of dead leaves depends on both biotic and abiotic factors. The combination of climate （ e.g. mean annual temperature （MAT）, mean annual precipitation （MAP）, actual evapotranspiration, ere ） and litter quality （N content, C/N ratio and lignin content） appeared to be the primary controllers of little decomposition. This is particularly true for temperature, which is inextricably linked to other environment parameters as a mutually confounding factor in terrestrial systems. Global average surface air temperature is predicted to increase 1.1--6.4 ℃ over this century. Climate warming is expected to cause species movements and extinctions, change the composition of communities and alter ecosystem functioning. As decomposition depends strongly on temperature, it is expected to be particularly sensitive to climate warming. However, it is still unclear how climate changes influence little decomposition. As global climate changes, it will become warmer and somewhat drier in forest ecosystems, in northeastern China. Changes in global warming and drying could affect forest distribution. The areas of tropical forests and subfrigid forests might increase and that of temperate forests and boreal coniferous forests might decrease, which might affect little quality by altering the structure and species of the original forest communities. The primary temperate forest in northeastern China is dominated by Korean pine （Pinus koraiensis Sieb.et Zucc. ） mixed with deciduous species. Many studies showed that Quercus mongolica will become a main associated tree species in broadleaved Pinus koraiensis forest, because it is more conducive to survival under theenvironment change in future. Therefore, the process of litter decomposition will be affected by climate warming and composition of little species change. Given that decomposition of dead plant tissues in forest ecosystems re

关 键 词：红松 蒙古栎 凋落物分解 温度 二氧化碳累计产量 

分 类 号：S714[农业科学—林学]