马尾松人工林林窗大小对四种凋落叶质量损失和养分释放的影响

发布时间：2018-09-06 18:24

【摘要】：马尾松人工林乔木层植物凋落物的分解对林地养分平衡和系统物质循环具有重要意义,并可能受不同大小林窗下微环境差异的影响。采用凋落物袋分解法,以马尾松(Pinus massoniana)人工林人为砍伐形成的7个不同大小林窗(G1:100 m~2、G2:225 m~2、G3:400 m~2、C4:625 m~2、G5:900 m~2、G6:1225m~2、G7:1600 m~2)为研究对象,林下(G0)为对照,研究林窗大小对红椿(Toona ciliata)、桢楠(Phoebe zhennan)、香樟(Cinnamomum camphora)和马尾松4种乡土树种凋落叶质量损失及养分释放的影响。结果显示:1)林窗大小(G0-G7)显著影响林窗中心放置的红椿和桢楠凋落叶N和P释放率、香樟凋落叶失重率和N、P、K释放率以及马尾松凋落叶P和K释放率。相对于林下,中小型林窗(G1-G4)的凋落叶失重率和N、P释放率明显较大,而大型林窗(G6-G7)的凋落叶K释放率明显较大。2)林窗内放置位置显著影响红椿、桢楠和马尾松凋落叶的K释放率及香樟凋落叶的P释放率。红椿和桢楠的凋落叶K释放率从林窗中心到边缘显著减少,而马尾松凋落叶K释放率及香樟P释放率从林窗中心到边缘显著增加。3)4种凋落叶类型中红椿凋落叶分解最快,其分解50%和95%所需时间分别为5.29和23.14个月。上述结果表明,林窗大小和林窗内位置对凋落物质量损失及其养分释放具有显著影响,但影响大小及趋势随物种初始基质质量的差异具有明显变化,研究结果为亚热带低山丘陵区马尾松人工低效林的科学经营及管理提高了一定的科学依据。
[Abstract]:The decomposition of litter in tree layer of Pinus massoniana plantation is of great significance to nutrient balance and systematic material circulation of forest land, and may be affected by the difference of microenvironment under different forest windows. The litter bag decomposition method was used to study 7 forest windows of different sizes (G1: 100m ~ 2G2: 2G3: 400m) (G1: 100m) and 2G5: 1225m2G771600mm2 (G0) under the forest, respectively, using the litter bag decomposition method as the research object, and the following forest (G0) as the control, and G5: 1225m2G71600mm2 (G0) under the forest as the control, and G5: 1225m2G71600mm2 as the control, G0 as the control, and G5: 1225m2G71600mm2. The effects of forest gap size on leaf mass loss and nutrient release of four native tree species, (Cinnamomum camphora) and Masson pine, were studied. The results showed that G0-G7 significantly affected the N and P release rates, the weight loss rate, the P and K release rates of leaves of Pinus massoniana and Pinus massoniana, which were placed in the center of the forest gap, and the weight loss rate of leaves of Cinnamomum camphora and the release rate of P and K in leaves of Pinus massoniana (Pinus massoniana). The litter weight loss rate and N ~ + P release rate of small and medium-sized forest windows (G1-G4) were significantly higher than that of forest gaps (G6-G7), while K release rate of large forest windows (G6-G7) was larger than that of small and medium-sized forest windows (G6-G7). (2) the location of leaves in small and medium-sized forest windows (G1-G4) significantly affected the weight loss rate and K release rate of leaves of Chinese toon. K release rate of littered leaves and P release rate of leaves of Cinnamomum camphora and Pinus massoniana were studied. The K release rate of leaves of Pinus massoniana and Pinus massoniana decreased significantly from the center to the edge of the forest, and the K release rate and P release rate of Cinnamomum camphora increased significantly from the center of the forest window to the edge of the four leaf types. The decomposition time of 50% and 95% was 5.29 and 23.14 months, respectively. The results showed that the gap size and the position of the canopy had a significant effect on litter mass loss and nutrient release, but the effect and trend varied significantly with the difference of the initial substrate mass of the species. The results provided a scientific basis for the scientific management and management of Pinus massoniana plantation in the subtropical hilly region.
【作者单位】：四川农业大学生态林业研究所四川生态林业工程重点实验室;
【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)
【分类号】：S714

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