凋落物去除对长三角典型毛竹林土壤CO_(2)和N_(2)O通量的影响  

The Impact of Litter Removal on Soil CO_(2)and N_(2)O Fluxes in Typical Moso Bamboo Forests in the Yangtze River Delta,China

作　　者：徐飞 贾沁琦 郭娜 胡嘉豪 方双喜 XU Fei;JIA Qinqi;GUO Na;HU Jiahao;FANG Shuangxi(Department of Environment,Zhejiang University of Technology,Hangzhou 310014,P.R.China;Zhejiang Carbon Neutral Innovation Institute,Zhejiang University of Technology,Hangzhou 310014,P.R.China)

机构地区：[1]浙江工业大学环境学院,浙江杭州310014 [2]浙江工业大学浙江碳中和创新研究院,浙江杭州310014

出　　处：《生态环境学报》2025年第3期380-390,共11页Ecology and Environmental Sciences

基　　金：国家重点研发计划项目(2023YFC2305205);国家自然科学基金项目(42275113)。

摘　　要：毛竹(Phyllostachys edulis)林是长江三角洲地区典型的森林类型,在缓解温室效应、维持碳平衡等方面具有重要作用。林地凋落物层可能是影响二氧化碳(CO_(2))和氧化亚氮(N_(2)O)在土壤与大气之间交换的重要因素。以浙江省安吉县毛竹林为对象,采用静态箱-气相色谱法,分析清除凋落物(S)和保留凋落物(SL)处理对土壤CO_(2)和N_(2)O通量的影响及调控因素。结果表明,观测期内毛竹林土壤为CO_(2)的源,夏季排放最强;S处理的毛竹林土壤由夏秋季的N_(2)O排放源转变为冬春季的N_(2)O吸收汇;而SL处理的土壤则始终表现为N_(2)O的排放源。凋落物显著影响毛竹林地土壤CO_(2)和N_(2)O通量。S处理下的CO_(2)年均排放通量(779.27 mg·m^(-2)·h^(-1))高于SL处理(520.07 mg·m^(-2)·h^(-1)),凋落物对土壤CO_(2)通量的平均抑制贡献率为33.26%;相反,S处理下的N_(2)O年均排放通量(2.95μg·m^(-2)·h^(-1))则低于SL处理(16.42μg·m^(-2)·h^(-1))。土壤温度是决定竹林土壤CO_(2)通量的重要因素,其次为土壤有机碳;清除凋落物处理下的土壤温度是影响N_(2)O通量变化的主要因素,而保留凋落物处理下全氮则是改变N_(2)O通量的关键因子。总体而言,毛竹林地以竹叶为主的凋落物层会抑制土壤CO_(2)的排放,促进N_(2)O的排放。该研究为深入理解竹林土壤地气交换的调控机制提供了重要依据,建议在评估林地温室气体收支时考虑凋落物层的影响。Moso bamboo(Phyllostachys edulis)forest is a typical forest type in the Yangtze River Delta region and plays a crucial role in mitigating the greenhouse effect and maintaining the carbon balance.The forest litter layer may significantly influence the exchange of carbon dioxide(CO_(2))and nitrous oxide(N_(2)O)between the soil and atmosphere.This study was conducted in a Moso bamboo forest in Anji County,Zhejiang Province,China,where two treatments were implemented:soil without litter(S),and soil with litter(SL).The static chamber gas chromatography method was used to analyze the effects of these treatments on soil CO_(2)and N_(2)O fluxes and the regulating factors involved.The results indicated that the Moso bamboo forest soil was a net source of CO_(2)during the observation period,with the highest emissions occurring in summer.Soil without litter turned from a net N_(2)O source to slight N_(2)O sinks from summer and fall to winter and spring,whereas soil with litter was consistently a net N_(2)O source.The litter significantly affected soil CO_(2)and N_(2)O fluxes that the average annual CO_(2)flux under the S treatment(779.27 mg·m^(-2)·h^(-1))significantly higher than that the SL treatment(520.07 mg·m^(-2)·h^(-1)),indicating a 33.26%inhibitory contribution of litter to soil CO_(2)flux.Conversely,the average annual N_(2)O flux under the S treatment(2.95μg·m^(-2)·h^(-1))was lower than that under the SL treatment(16.42μg·m^(-2)·h^(-1)).Soil temperature is a key factor in the CO_(2)flux in bamboo forest soils,followed by soil organic carbon.Soil temperature was the primary factor influencing the variation in N_(2)O flux in the S plots,whereas total nitrogen content was the main factor influencingN_(2)O flux changes in the SL plots.Overall,the litter layer,which is mainly composed of bamboo leaves,inhibits soil CO_(2)emissions,but increases N_(2)O emissions.This study provides important insights into the regulatory mechanisms of soil-atmosphere exchanges in bamboo forests and suggests that the impact of lit

关 键 词：毛竹林 CO_(2) N_(2)O 通量 凋落物 

分 类 号：X831[环境科学与工程—环境工程]