桉树相思树混交林对薇甘菊入侵的控制效果评价.

[Objective] To explore the invasion control effect of Eucalyptus spp. mixed forest on Mikania micrantha. [Method] This study compared pure Eucalyptus spp.forest with two mixed models: 1 row of Eucalyptus spp.+1 row of Acacia confusa (mixed mode A) and 2 rows of Eucalyptus spp. +2 rows of Acacia confusa (mixed mode B). The growth status, Mikania biomass, leaf biomass, stand transparency and Mikania micrantha coverage of the three afforestation models were analyzed and the key factors controlling Mikania micrantha were revealed. [Result] The results showed that in the mixed forest, the average height, average diameter at breast height, average crown width, and single leaf biomass of Acacia confusa were higher than those of pure Eucalyptus spp. forests; The order of stand transmittance and biomass of Mikania micrantha is as follows: pure Eucalyptus spp.forest>mixed mode B-mixed mode A (P<0.05). The order of total leaf biomass and Mikania micrantha biomass in the tree layer of the forest is as follows: mixed mode A-mixed mode B>pure eucalyptus forest; among the three afforestation modes, the coverage of Mikania micrantha reaches over 70% and only exists in the pure eucalyptus forest, with a coverage of only 5%-10% or only in the mixed forest without Mikania micrantha. Based on the above factors, the effectiveness of the three afforestation modes in controlling the invasion of Mikania micrantha is as follows: mixed mode A-mixed mode B>Eucalyptus spp. pure forest, indicating that factors such as forest density, degree of branch and leaf flourishing, and forest transparency are the key to controlling the invasion of Mikania micrantha. [Conclusion] The research results provide a reference basis for constructing Eucalyptus acacia mixed forests in the southeastern region of Guangxi to control the occurrence of Mikania micrantha. [ABSTRACT FROM AUTHOR]