除草剂对桉树人工林生物量和碳储量的影响

除草剂在全球桉树人工林经营中的应用十分普遍,但人们对除草剂施用对人工林生态系统生物量和碳储量的影响还知之甚少,本研究旨在评估除草剂对生物量和碳储量的影响,为林下植被管理提供科学建议。本研究以2015年建立的桉树人工林为对象,开展低浓度高频率(LHF)、中浓度中频率(MMF)和高浓度低频率(HLF)除草剂喷施试验,并以人工除草为对照,分别于造林后33月、39月和51月对试验林分的生物量和碳储量进行研究。结果表明,除草剂对桉树生物量和碳储量没有显著影响,但对林下植被生物量和碳储量存在明显的负作用,HLF处理对生态系统碳储量也存在显著的负效应,而人工除草抚育能提高林下植被生物量、碳储量以及生态系统碳储量。因此,从碳汇林业的视角考虑,建议生产上减少除草剂的施用,而采取人工砍草抚育为宜。

Effects of Glyphosate Herbicides Application on Biomass and Carbon Stocks in Eucalyptus Plantations

Herbicides are widely used in the management of Eucalyptus plantations around the world,but little is known about the effects of herbicide application on biomass and carbon stocks of plantation ecosystems.This study aims to evaluate the herbicides on biomass and carbon stocks and provide scientific advice for understory vegetation management.In this study,the Eucalyptus plantation established in 2015 was used as the object,low-dose high-frequency (LHF),medium-dose medium-frequency (MMF) and high-dose low- frequency (HLF) herbicide spraying experiments,were conducted.Using artificial weeding as a control,the biomass and carbon stocks of the experimental stands were studied in 33 months,39 months,and 51 months after afforestation.The results show that herbicide has no significant effects on biomass and carbon stocks of Eucalyptus.However,herbicide has significant negative effects on biomass and carbon stocks of understory vegetation.HLF treatment also has a significant negative effect on the carbon stocks of the ecosystem.While manual tending can increase the biomass,carbon stocks and ecosystem carbon stocks of understory vegetation.Therefore,from the perspective of carbon sequestration forestry,it is recommended to reduce the application of herbicides in production,and it is appropriate to adopt manual chopping and tending.