Effects of Herbicide Applications on Plant Functional Groups in Mixed Eucalyptus × Dalbergia odorifera Plantations in Subtropical China
Author(s): WEN Yuan-guang, YANG Liu, ZHU Hong-guang, CAI Dao-xiong, YOU Ye-ming, JIA Hong-yan, ZHOU Xiao-guo, YAN Li, State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Forestry College of Guangxi University, Experiment Center of Tropical Forestry, Chinese Academy of Forestry
Pages: 578-585
Year: 2015 Issue: 6
Journal: Guangxi Sciences
Keyword: plant functional group; herbicide; Eucalyptus; Dalbergia odorifera; mixture plantation;
Abstract: 【Objective】The effects of herbicide(glyphosate)applications to plant functional groups(PFGs)were studied in mixed Eucalyptus × Dalbergia odorifera plantations under burning and unburning sites.【Methods】The plant community composition and PFGs response to herbicide application were estimated through the experiments of burning and herbicide(BH),unburning and herbicide(UBH),and the control of unburning and unherbicide(CK).【Results】Compared with the control,the constant species,especialy rare species in the plant community differed markedly between treatments after two-year herbicide application,although understory plant community had a high coeffecient of similarity(Jaccard index is more than over 0.7).The constant species of the UBH was higher 37.50% and 57.14% than that ofBH and CK,respectively.In contrast,rare species of the community was increased from 2species in UBH to 24 species in BH and 7species in CK,respectively.This result indicated that BH promoted the development of rare species,whereas UBH promoted the development of constanspecies.The BH increased species richness of grass and legume PFGs,while the UBH decreasespecies richness of vines and woody PFGs.However,only species richness of woody PFGs hasignificant difference(P <0.05)between treatments.BH decreased the relative abundanc(RA)and relative coverage(RC)of forbs,grasses and legumes PFGs,and significantly decreased the RA and RC of ferns PFGs but significantly increased the RC of woody PFGs.UBH decreased significantly the RC of woody PFGs.【Conclusion】This study clearly demonstratethat the effects of herbicide applications with low concentration and low frequency on understory PFGs are initial and short term.
Pages: 578-585
Year: 2015 Issue: 6
Journal: Guangxi Sciences
Keyword: plant functional group; herbicide; Eucalyptus; Dalbergia odorifera; mixture plantation;
Abstract: 【Objective】The effects of herbicide(glyphosate)applications to plant functional groups(PFGs)were studied in mixed Eucalyptus × Dalbergia odorifera plantations under burning and unburning sites.【Methods】The plant community composition and PFGs response to herbicide application were estimated through the experiments of burning and herbicide(BH),unburning and herbicide(UBH),and the control of unburning and unherbicide(CK).【Results】Compared with the control,the constant species,especialy rare species in the plant community differed markedly between treatments after two-year herbicide application,although understory plant community had a high coeffecient of similarity(Jaccard index is more than over 0.7).The constant species of the UBH was higher 37.50% and 57.14% than that ofBH and CK,respectively.In contrast,rare species of the community was increased from 2species in UBH to 24 species in BH and 7species in CK,respectively.This result indicated that BH promoted the development of rare species,whereas UBH promoted the development of constanspecies.The BH increased species richness of grass and legume PFGs,while the UBH decreasespecies richness of vines and woody PFGs.However,only species richness of woody PFGs hasignificant difference(P <0.05)between treatments.BH decreased the relative abundanc(RA)and relative coverage(RC)of forbs,grasses and legumes PFGs,and significantly decreased the RA and RC of ferns PFGs but significantly increased the RC of woody PFGs.UBH decreased significantly the RC of woody PFGs.【Conclusion】This study clearly demonstratethat the effects of herbicide applications with low concentration and low frequency on understory PFGs are initial and short term.
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