Welcome to visit Scientia Silvae Sinicae,Today is

Scientia Silvae Sinicae ›› 2023, Vol. 59 ›› Issue (5): 21-31.doi: 10.11707/j.1001-7488.LYKX20221003

Previous Articles     Next Articles

Comparison of Spatial Structure between Coniferous and Broad-Leaved Mixed Forest and Evergreen Broad-Leaved Forest in Tianmu Mountains

Rui Chen1,2(),Mengping Tang1,2,*()   

  1. 1. State Key Laboratory of Subtropical Silviculture, Zhejiang A & F University Lin’an 311300
    2. School of Environmental and Resources Science, Zhejiang A & F University Lin’an 311300
  • Received:2021-01-04 Accepted:2023-05-25 Online:2023-05-25 Published:2023-08-02
  • Contact: Mengping Tang E-mail:461380889@qq.com;tmpzafu@163.com

Abstract:

Objective: The spatial structure of coniferous and broad-leaved mixed forest and evergreen broad-leaved forest in Tianmu Mountains was compared and analyzed, and the succession pattern from coniferous and broad-leaved mixed forest to evergreen broad-leaved forest was revealed from the viewpoint of spatial structure, so as to provide a basis for sustainable management of evergreen broad-leaved forest and coniferous and broad-leaved mixed forest. Method: A 1 hm2 fixed plot was set up for evergreen broad-leaved forest and coniferous and broad-leaved mixed forest in Tianmu Mountains National Nature Reserve of Zhejiang Province in 2015 and 2016 respectively. The tree species, DBH and three-dimensional spatial coordinates of each tree were investigated. Python language and ArcGIS software were used to calculate the spatial structure index of the two forest types. Result: The plant density of evergreen broad-leaved forest and coniferous and broad-leaved mixed forest was 2850 and 1842 plants·hm?2, respectively, and the former was 54.72% larger than the latter. The number of tree species in evergreen broad-leaved forest and coniferous and broad-leaved mixed forest was 89 and 66, respectively, and the former was 23 more than the latter. The number of dominant tree species in evergreen broad-leaved forest and coniferous and broad-leaved mixed forest was 14 and 4, respectively. Cyclobalanopsis glauca had the highest dominant position in evergreen broad-leaved forest, and Cunninghamia lanceolata had the highest dominant position in coniferous and broad-leaved mixed forest. In terms of spatial structure, the aggregation index of evergreen broad-leaved forest community was between [0.75, 1], and the tree distribution pattern belonged to weak aggregation, while that of coniferous and broad-leaved mixed forest was in the range of [1,1.38], and the tree distribution pattern belonged to weak uniform distribution. The mixing degree of the two kinds of forest communities was between [0.5 and 0.75], which was moderate mixing. The forest community competition index of evergreen broad-leaved forest was in the range of [28, 44], which belonged to moderate competition, while that of coniferous and broad-leaved mixed forest was in the range of [128, 28], showing low competition as a whole. Conclusion: The plant density, tree species and dominant tree species of evergreen broad-leaved forest are significantly higher than those of coniferous and broad-leaved mixed forest. Compared with coniferous and broad-leaved mixed forest, evergreen broad-leaved forest has lower mixing degree, more aggregated distribution and more fierce competition. The distribution patterns of 4 dominant tree species in coniferous and broad-leaved mixed forest are all aggregated distribution. Among the 14 dominant tree species in evergreen broad-leaved forest, except Torreya grandis, blue fruit tree and Pinus elliottii, the other 11 dominant tree species are all aggregated distribution. The dominant tree species of the two forest communities are more than moderately mixed, in which Pinus elliottii in the evergreen broad-leaved forest is intensively mixed, and the mixing degree of the dominant tree species increases in the evergreen broad-leaved forest with the decrease of the dominant tree species. but there is no significant difference in coniferous and broad-leaved mixed forest. The competition intensity of the same dominant tree species in evergreen broad-leaved forest is higher than that in coniferous and broad-leaved mixed forest. In forest management, it is necessary for evergreen broad-leaved forest to strengthen the tending of dominant tree species with aggregate reproduction characteristics, increase community mixing degree, reduce community competition intensity and aggregation degree, and improve community stability. The coniferous and broad-leaved mixed forest can be suitable to take measures of tending and promoting renewal, increasing community density and tree species diversity, and improving community mixing degree and tree spatial distribution uniformity, so as to promote community succession to evergreen broad-leaved forest.

Key words: evergreen broad-leaved forest, coniferous and broad-leaved mixed forest, spatial distribution pattern, mingling, competition index

CLC Number: