Effects of Close-to-Nature Conversion on Pinus massoniana Plantations at Different Stand Developmental Stages
Effects of Close-to-Nature Conversion on Pinus massoniana Plantations at Different Stand Developmental Stages
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DOI：
10.1177/1940082918767953
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发表时间：
2018
影响因子：
1.7
通讯作者：
Xiao-Mei Wang;Yuan-chang Lu;Haitao Xing;Ji Zeng;Yangsheng Xie;D. Cai;Xianzhao Liu;Xianqiang Zhang
中科院分区：
文献类型：
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作者：
Xiao-Mei Wang;Yuan-chang Lu;Haitao Xing;Ji Zeng;Yangsheng Xie;D. Cai;Xianzhao Liu;Xianqiang Zhang
贴近自然（CTN）林业整合多种森林功能，强调森林生态系统保护。在此框架内，森林通常维持为具有多个垂直层的不均匀年龄的混合林分，并按照规定的林分发展阶段（即森林演替的各个阶段）进行管理。本研究旨在利用中国南方 28 个采用 CTN 方法管理的地块和 58 个传统单一栽培地块的数据，评估 CTN 管理对马尾松林分结构和生长的长期影响。对 CTN 林分和单一栽培林分五个发展阶段的三个垂直层进行了比较。结果表明，CTN林分树种多样性有所提高，马尾松重要值有所下降。这种转变并没有改变所有物种的平均直径增长，但确实促进了马尾松在冠层的径向生长。在最后两个阶段，随着采伐的进行，CTN林分的林分生长（以树冠树木的断面积和体积而言）下降，并且CTN林分中马尾松的体积生长也下降。然而，这种转变似乎提高了亚冠层和再生层的林分生产力，观察到所有物种的相对优势值较高，特别是在后期。总体而言，CTN转换倾向于有利于林分结构并改善马尾松的单树生长而不是总林分生长。
Close-to-nature (CTN) forestry integrates multiple forest functions and emphasizes forest ecosystem conservation. Within this framework, forests are typically maintained as uneven-aged mixed stands with multiple vertical layers and are managed following the defined stand developmental stages, that is, the various phases of forest succession. This study aimed to evaluate the long-term effects of CTN management on the stand structure and growth of Pinus massoniana using data from 28 plots managed with the CTN approach and 58 plots of traditional monocultures in southern China. A comparison was performed between three vertical layers across five developmental stages of the CTN stands and the monoculture stands. The results showed that the tree species diversity improved in the CTN stands, with a decrease in the importance value of P. massoniana. The conversion did not change the diameter growth averaged over all species, but it did promote the radial growth of P. massoniana in the canopy layer. The stand growth, in terms of the basal area and the volume of the canopy trees, declined in the CTN stands during the final two stages, as harvesting took place, and the volume growth of P. massoniana also decreased in the CTN stands. However, the conversion seemed to improve the stand productivity of the subcanopy and regeneration layers, where higher relative dominance values of all species were observed, especially during the later stages. Overall, the CTN conversion tended to benefit the stand structure and improve the single tree growth of P. massoniana rather than the total stand growth.