林窗大小对马尾松人工林凋落叶可溶性有机碳损失的影响

发布时间：2018-03-12 10:31

本文选题：可溶性有机碳　切入点：林窗　出处：《东北林业大学学报》2016年01期 　论文类型：期刊论文

【摘要】：基于人工林近自然改造,调控低山丘陵区马尾松低效林林分结构,探明马尾松人工林不同面积林窗下,凋落叶可溶性有机碳(DOC)释放规律。以长江上游低山丘陵区人为采伐形成的马尾松人工林7种林窗(100、225、400、625、900、1 225、1 600 m~2)为研究对象,研究不同面积林窗的马尾松(Pinus massoniana)、红椿(Toona ciliata)、樟(Cinnamomum camphora)、桢楠(Phoebe zhennan)等凋落叶可溶性有机碳(DOC)的损失率。结果表明:(1)林窗面积对凋落叶DOC损失率有显著影响。中小面积林窗(225~625 m~2)内凋落物的DOC损失率高于其它面积林窗。(2)经过1 a的分解,4种凋落叶的DOC损失率为61.55%~90.06%,其中:DOC损失率红椿最高,马尾松最低。(3)凋落叶的DOC损失主要集中在分解前期(0~90 d),此后凋落叶的DOC损失速率不断降低,且不同凋落物之间DOC损失速率的差异不断减小。因此,在马尾松低效林改造过程中,可利用中小面积林窗这一显著作用,引入乡土阔叶树种红椿、樟、桢楠,加速马尾松人工林的物质循环,维持林地肥力。
[Abstract]:Based on the near natural transformation of plantation, the substructure of Pinus massoniana (Pinus massoniana) inefficiency Lin Lin was regulated in the low mountain and hilly region, and the different area of Pinus massoniana plantation was found under the forest window. The release rule of soluble organic carbon (DOC) from littered leaves was studied in 7 species of Pinus massoniana plantation (Pinus massoniana) planted in hilly area of upper reaches of the Yangtze River. The loss rates of Pinus massoniana, Toona ciliataer, Cinnamomum camphora and Phoebe Phoebe zhennananet in different areas of Pinus massoniana, Toona ciliata, Cinnamomum camphora, etc., were studied. The results showed that the area of the forest window had a significant effect on the loss rate of DOC. The DOC loss rate of litter was higher than that of other areas of forest. 2) after 1 year of decomposition, the DOC loss rate of four kinds of litters was 61.5510% and 90.06%, among which the loss rate of 1% DOC was the highest. The DOC loss of the litter leaves of Pinus massoniana was mainly concentrated in the early stage of decomposition, and the DOC loss rate of the leaves decreased continuously, and the difference of the DOC loss rates among different litters decreased continuously. Therefore, in the process of low efficiency forest transformation of Pinus massoniana, the DOC loss rate of the litter leaves decreased continuously in the early stage of decomposition, and the difference of the DOC loss rates among different litters was also decreased. The significant effect of small and medium area forest window can be used to introduce native broad-leaved tree species such as Toona sinensis, Cinnamomum camphora and Cynthia chinensis to accelerate the material circulation of Pinus massoniana plantation and maintain the fertility of forest land.
【作者单位】：四川农业大学;
【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) 四川省科技应用基础项目(2012JY0047) 四川省教育厅科技创新团队计划项目(11TD006)
【分类号】：S714.2

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