生态学报2017，Vol.37Issue(9)：2894-2903,10.DOI:10.5846/stxb201601270197
抚育对林地土壤碳释放的影响——基于Yasso07估算
Effects of forest thinning on soil CO2 emissions in a pine-oak mixed stand in the Qinling Mountains based on the Yasso07 model estimate
摘要
Abstract
Natural forest-protection programs have been implemented to increase stand volume and forest ecosystem diversity,and to improve forest resources.However,they have had some negative influences on forests,such as high stand density and poor growth,and these can easily lead to insect outbreaks and fire disasters.Forest thinning can effectively eliminate the negative influences caused by natural forest protection management.Forest thinning programs have been conducted for several years and these approaches have led to reduced tree mortality and accelerated natural regeneration.However,it has been demonstrated that forest micro-climates influence soil CO2 emissions.This study investigated the effects of forest thinning on soil CO2 emissions using the Yasso07 model to simulate a pine-oak mixed forest in the Huoditang forest zone area of the Qinling Mountains.The topography of the Qinling Mountains is complicated and fractured,so it is difficult to duplicate experimental plots in a randomized block design.Therefore,the quadratic general rotary design was applied,and thinning and residue-removed intensity were the factors in the experiment.Thirteen experimental plots were selected,including five control levels and nine treatment plots.Five litter-fall collection frames (1 m × 1 m) were laid in each experimental plot.The litter fall was collected each month from September 2012 to September 2014.The ethanolsoluble,water-soluble,acid-soluble,and non-soluble compound contents in the leaf litter fall were determined.Althoughthe technology to measure soil CO2 emissions has continually improved,the soil spatial heterogeneity and strong soil carbon stability in undisturbed habitats has led to inaccuracies in the evaluation methods used in forest soil carbon dynamics research.Yasso07 is a soil-carbon decomposition model and is based on the assumption that there are four types of litter transformation.Yasso07 has been widely used in Europe and the United States because it can be operated easily;requires few parameters,which are easy to obtain;and the simulated results are reliable.However,there was no basis to determine if it could be applied in the Qinling Mountains.Therefore,this study validated the reliability of the Yasso07 model in this region.The soil CO2 emission traits under different thinning and residue-removed intensities were analyzed based on simulations by the model.The following results were obtained:(1) there was a significant difference between the conifer and broadleaf litter chemical compositions.The ethanol and water soluble compound contents were significantly higher in the conifer tree litter than in the broadleaf tree litter,and the non-soluble compound content was significantly lower in conifer litter than in broadleaf litter.(2) The chemical composition of the litter fall significantly affected soil CO2 emissions,and (3) thinning intensity was the key factor affecting CO2 emissions.Soil CO2 emissions increased after forest thinning,and when the thinning and residue-removed intensities were 12.38％ and 53.18％,respectively,the soil CO2 emission fell to a minimum of-15.318 Mg hm-2 a-1.关键词
间伐/土壤碳释放/Yasso07模型/松栎混交林/秦岭Key words
forest thinning/Soil CO2 emission/Yasso07 soil carbon model/Pine-oak mixed forest/the Qinling Mountains引用本文复制引用
罗春林,侯琳,白龙龙,耿增超,和文祥..抚育对林地土壤碳释放的影响——基于Yasso07估算[J].生态学报,2017,37(9):2894-2903,10.基金项目
国家林业公益性行业科研专项(201304307) （201304307）
