Self-Thinning Trajectories of Chinese Fir Plantations in Southern China
Self-Thinning Trajectories of Chinese Fir Plantations in Southern China
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DOI：
10.5849/forsci.16-004
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发表时间：
2016-12
期刊：
影响因子：
1.4
通讯作者：
Xiongqing Zhang;Q. V. Cao;A. Duan;Jianguo Zhang
中科院分区：
文献类型：
--
作者：
Xiongqing Zhang;Q. V. Cao;A. Duan;Jianguo Zhang
杉木[杉木]。[Hook.])是中国南方最重要的针叶树种，具有广泛的地理分布。在充分放养的林分中，自疏是森林生长与死亡之间的动态平衡。本研究采用分割模型对杉木人工林林分密度和二次平均直径的变化轨迹进行了分析。结果表明，线性-二次线性模型能较好地模拟杉木人工林的自疏轨迹。对于特定省份，自疏坡随种植密度的变化是不变的。江西、福建的自疏轨迹与广西、四川的自疏轨迹相似，但又有所不同。四川杉木人工林自疏线坡度明显高于其他3省（4.2169比2.4453）。这些坡度比Reineke提出的1.605更陡。
Chinese fir (Cunninghamia lanceolata [Lamb.] Hook.) is the most important conifer species for timber production with a wide geographic distribution in southern China. Self-thinning is a dynamic equilibrium between forest growth and mortality in fully stocked stands. In this study, the segmented model was used to analyze the trajectory of stand density and quadratic mean diameter of Chinese fir plantations. Results showed that a linear-quadratic-linear model could simulate the self-thinning trajectories of Chinese fir plantations well. For a given province, the self-thinning slope was invariant with changes in planting densities. The self-thinning trajectories in Jiangxi and Fujian provinces were similar and were different from those in Guangxi and Sichuan provinces. The slope of the self-thinning line of Chinese fir plantations in Sichuan province was much steeper than that of the other three provinces ( 4.2169 versus 2.4453). These slopes were steeper than the value of 1.605 as proposed by Reineke for many species.