摘要
通过探究马尾松(Pinus massoniana)人工林不同林窗下3个树种凋落叶全碳释放动态,为低山丘陵区低效人工林林分改造及结构调整提供科学依据。以长江上游低山丘陵区人为采伐形成的4种面积的马尾松人工林林窗(G1:100m^2、G3:400 m^2、G4:900 m^2、G5:1600 m^2)为研究对象,以林下为对照,对比分析林窗内马尾松、樟(Cinnamomum camphora)、桢楠(Phoebe zhennan)凋落叶的全碳释放率。结果表明:林窗面积对凋落叶全碳释放有显著影响,900m^2林窗更利于凋落叶中有机质的释放;樟凋落叶春季的全碳释放率显著高于其他三季,而马尾松和桢楠凋落叶春、夏、秋季的全碳释放率较高,冬季最低,表明凋落叶的碳释放具有明显的季节动态。当前的研究结果表明凋落叶的碳释放受林窗面积、季节以及不同树种的综合影响。
In order to research foliar litter carbon release of three tree species in forest gaps of Pinus massoniana plantations, and provide a scientific basis for plantation stand transformation and structure adjustment in hilly area of the upper reaches of the Yangtze River. A field litterbag experiment was taken in four gap sizes (G1: 100 m2, G2: 400 m2, G3: 900 m2, G4: 1 600 m2) in Pinus massoniana plantations, as the closed canopy being the control, the carbon release of Pinus massoniana (Pm), Cinnamomum camphora (Cc) and Phoebe zhennan (Pz) foliar litter were analyzed. Our results indicated that the gap size had significant effects on carbon release, and carbon release rate was highest in forest gap of 900 m2; carbon release rate of Cc in spring was significantly higher than other three seasons, however, it was higher of Pm and Pz in spring, summer and autumn, which indicated that the carbon release rate of foliar litter had dynamic seasonal varitions. In generlly, the present findings suggested that the carbon release in foliar litter would comprehensive affected by factors of gap size, seasonal variation and tree species.
出处
《生态环境学报》
CSCD
北大核心
2015年第10期1634-1639,共6页
Ecology and Environmental Sciences
基金
国家自然科学基金项目(31370628)
国家科技支撑计划项目(2011BAC09B05)
四川省科技支撑计划项目(12ZC0017)
四川省科技厅应用基础项目(2012JY0047)
四川省教育厅科技创新团队计划项目(11TD006)
关键词
马尾松人工林
凋落叶
林窗
季节动态
碳释放
Pinus massoniana plantations
foliar litter
forest gap
seasonal variations
total carbon release rate
