
Analyses of the temperate forests development and succession stage in Wangqing County based on TWINSPAN
JIA Ke, WANG Xinjie, HE Jingyuan, LU Yan
JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2024, Vol. 48 ›› Issue (1) : 179-186.
Analyses of the temperate forests development and succession stage in Wangqing County based on TWINSPAN
【Objective】 Temperate forests account for nearly 20% of the global forest area. They are scattered and located in densely populated areas that are prone to disturbance and face ecological problems that include loss of species diversity. Accurately classifying the developmental stages of temperate forests, providing methods and theoretical bases for forest management at each stage, and achieving efficient management of temperate forests are urgent problems. 【Method】 In this study, considering the tree species composition of 5 124 subcompartments in the forest resource inventory in Wangqing County, Jilin Province, in 2017 as the research object, the TWINSPAN method was used to reveal the succession stage and development law of temperate forests in this area. Relevant measures of forest management were proposed according to the characteristics of different development stages. 【Results】 Stand structure and growth change indices, such as stand age, average tree height, storage volume per hectare, total storage volume, and number of plants per hectare were selected. The stages of successional development were determined and the temperate forests in the study area were classified into seven categories: mixed broadleaf forest of Betula platyphylla, mixed broadleaf forest of Quercus mongolica, mixed coniferous and broadleaf forest of Q. mongolica, mixed coniferous and broadleaf forest of B. platyphylla and Picea asperata, mixed coniferous and broadleaf forest of P. asperata and B. platyphylla, mixed coniferous and broadleaf forest of Pinus koraiensis and P. asperata, and mixed broadleaf forest of P. koraiensis and Picea asperata. Among these, the mixed coniferous and broadleaf forests of P. koraiensis and P. asperata displayed the largest shared area and constitute the main forest types in the region. The succession characteristics of each forest type were obvious; the top species represented by P. koraiensis and P. asperata, and the companion species represented by Tilia tuan and Acer pictum subsp. mono changed from weak to strong, and the number share gradually expanded. The pioneer species, represented by B. platyphylla and Populus davidiana gradually decreased and finally formed a top community of mixed broadleaf forests of P. koraiensis and P. asperata. 【Conclusion】 Based on a large amount of survey data, this study applied the TWINSPAN classification method to delineate seven successional stages in temperate forests of Wangqing County, summarize the characteristics of each successional stage, and confirm that each successional stage conformed to the characteristics of growth and development in the time gradient. The data provide theoretical support for efficient forest management measures in different successional stages, and provide a reference to maintain the relative stability of forest structure and function to form high-quality and high-yielding forest stands.
temperate forests / TWINSPAN classification / forest succession / developmental succession stage / Wangqing County / Jilin Province
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