摘要
为定量评价木林子天然林不同恢复阶段林分结构特征变化及森林恢复现状,以木林子自然保护区内皆伐后自然恢复24、39 a的次生林及未受人为干扰的原始林为研究对象,通过林分空间结构参数分布、径阶-空间结构参数联合分布来量化描述林分径阶和空间结构特征,并采用林分空间结构指数(I)和林分空间结构距离(D)综合评价不同恢复阶段林分整体结构特征。结果表明:木林子天然林不同恢复阶段林分均混交良好,随恢复时间的推移,该林分水平分布格局整体趋势由聚集分布向随机分布发展,大小分化度呈先增加后降低的趋势,但始终趋于均衡状态。空间结构参数方差检验表明,在自然恢复过程中,大小比数、混交度能更快地趋于合理,而角尺度则需要较长时间的恢复。径阶-空间结构特征表明,各个恢复阶段林木均以随机林体为主,其中原始林林分中随机分布格局下极强度混交状态的林木胸径更大。不同恢复阶段,绝对优势等级林木中原始林的径阶区间最广。相较于24年生及39年生次生林林分,原始林空间结构最优,林分空间结构指数、林分空间结构距离分别为0.724、0.544。皆伐后自然恢复24、39 a的次生林需较长时间才能达到原始林的结构状态。
To quantitatively evaluate the changes of stand structure characteristics and forest restoration status in different restoration stages of natural forest in Mulinzi,the primary forest and the secondary forest that had been naturally restored for 24 and 39 years after clear-cutting in Mulinzi Nature Reserve were taken as the research objects,and the distribution of stand spatial structure parameters and the joint distribution of diameter class-spatial structure parameters were used to quantitatively describe the characteristics of stand diameter class and spatial structure.The overall structure characteristics of the stand at different restoration stages were comprehensively evaluated by the stand spatial structure index(I)and the stand spatial structure distance(D).The results showed that the natural forest was well mixed at different restoration stages,and with the progress of recovery time,the horizontal distribution pattern developed from aggregate distribution to random distribution,and the Dominance first increased and then decreased,and it always tended to be balanced.The variance test of spatial structure parameters showed that the Dominance and Mingling could be achieved the reasonable value more quickly with the process of natural restoration,while the Uniform angle index would spent longer time to be restored.The characteristics of diameter class-spatial structure showed that the trees in different restoration stage were all dominated by random structure unit,and especially the trees at the extreme intensity mixed state under the random distribution pattern in the primary forest stand were more thick and strong,and the diameter class interval of the primary forest was the widest among the trees with absolute dominant grades in different restoration stages.Compared with the secondary stands of 24 and 39 years old,the primary forest had the best spatial structure,the stand spatial structure index and stand spatial structure distance were 0.724 and 0.544,respectively.It takes a longer time for the secondar
作者
向钦
郭秋菊
艾训儒
姚兰
吴举扬
周云
薛卫星
Xiang Qin;Guo Qiuju;Ai Xunru;Yao Lan;Wu Juyang;Zhou Yun;Xue Weixing(Key Laboratory of Biological Resources Conservation and Utilization of Hubei Province,Hubei Minzu University,Enshi 445000,P.R.China;Huazhong Agricultural University)
出处
《东北林业大学学报》
CAS
CSCD
北大核心
2023年第11期21-26,44,共7页
Journal of Northeast Forestry University
基金
中国环境科学研究院生物多样性调查评估项目(2019HJ2096001006)
生物资源保护与利用湖北省重点实验室开放基金项目(PT012208)
湖北民族大学科研创新项目(MYK2022039)。
关键词
次生林
原始林
自然恢复
林分结构
径阶-空间二元分布
Secondary forest
Primary forest
Natural recovery
Stand structure
DBH class-spatial structure bivariate distribution
