Forest and Grassland Resources Research >
Competitive Relationship between Dominant Populations of Karst Secondary Forests
Received date: 2024-05-20
Revised date: 2024-08-02
Online published: 2025-04-18
This study explored the competitive relationships among dominant populations in secondary forests in karst areas.A typical karst secondary forest in the Zhongdong Scenic Spot of the Getu National Scenic Areas in Ziyun Miao and Buyi Autonomous County,Guizhou Province,abandoned for over 30 years,was selected as the study area.Based on 1.68 hm2 fixed sample plots,the Hegyi Competition Index was used to quantitatively analyze competitive relationships through field surveys.1)Based on the number of plants,a total of 2 805 trees with a diameter at breast height(DBH)more than 1 cm was investigated.Among these,the species consisting of Betula luminifera,Platycarya strobilacea,Pinus massoniana,Liquidambar formosana,and Populus davidiana collectively account for 2 455 individuals,constituting 87.52% of the total number of plants,and are thus identified as the dominant populations.2)The competitive pressure among trees was mainly exerted by those within 5 meters.However,for Betula luminifera and Liquidambar formosana,interspecific competition exceeded the intraspecific competition.The other three populations had more intraspecific than interspecific competition,which indicated that the competitive pressure of the secondary forests was mainly dominated by intraspecific competition.The intraspecific competitive pressures of the five dominant populations were ranked as follows:Platycarya strobilacea>Populus davidiana>Pinus massoniana>Liquidambar formosana>Betula luminifera.3)Competition model predictions showed a power function relationship between DBH and competition intensity in dominant populations,revealing that competition intensity tended to weaken with the gradual increase in DBH of individual trees in the population.The competition was most intense when DBH of individual trees in the population stands was in the range of 3 to 5 cm.After DBH reached 10 cm,the change in competition intensity tended to stabilize.Timely nursery management is recommended to reduce competitive pressure and enhance the stability before the DBH reaches 10 cm.
Key words： forest competition; Karst; dominant populations; secondary forest; competition index
Ming XU , Zongzheng CHAI , Caili SUN , Hua WANG . Competitive Relationship between Dominant Populations of Karst Secondary Forests[J]. Forest and Grassland Resources Research, 2024 , 0(4) : 29 -38 . DOI: 10.13466/j.cnki.lczyyj.2024.04.004
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