剔除杂草对山核桃林地土壤温室气体排放的影响

应用生态学报

剔除杂草对山核桃林地土壤温室气体排放的影响

刘娟^1,2,陈雪双^1,2,吴家森^1,2,姜培坤^1,2,周国模^1,2**,李永夫^1,2

(¹浙江农林大学浙江省森林生态系统碳循环与固碳减排重点实验室, 浙江临安 311300; ²浙江农林大学亚热带森林培育国家重点实验室培育基地, 浙江临安 311300)

出版日期:2015-03-18 发布日期:2015-03-18

Effects of understory removal on soil greenhouse gas emissions in Carya cathayensis stands.

LIU Juan^1,2, CHEN Xue-shuang^1,2, WU Jia-sen^1,2, JIANG Pei-kun^1,2, ZHOU Guo-mo^1,2, LI Yong-fu^1,2

(¹Zhejiang Provincial Key Laboratory of Carbon Cycling in Forest Ecosystems and Carbon Sequestration, Zhejiang A&F University, Lin’an 311300, Zhejiang, China; ²Nurturing Station for the State Key Laboratory of Subtropical Silviculture, Lin’an 311300, Zhejiang, China)

Online:2015-03-18 Published:2015-03-18

摘要/Abstract

摘要：

森林土壤是CO₂、N₂O和CH₄等温室气体的重要排放源,山核桃是中国特有的高档干果和木本油料树种,林下杂草管理对山核桃林地温室气体排放具有重要影响.采用静态箱-气相色谱法在浙江临安山核桃主产区进行了为期1年的原位试验,研究剔除林下杂草对山核桃林地土壤温室气体排放的影响.结果表明: 剔除杂草和留养杂草山核桃林地土壤CO₂排放通量呈现一致的季节变化规律:夏秋季高、冬春季低;N₂O排放在夏季较高,其他季节变化平稳;CH₄的排放无明显季节变化规律.剔除杂草显著降低了土壤CO₂排放,促进了N₂O排放和CH₄吸收.剔除杂草对土壤水溶性有机碳和微生物生物量碳没有显著影响.剔除杂草的山核桃林地土壤排放温室气体的综合增温潜势为15.12 t CO₂e·hm^-2·a^-1,显著低于留养杂草处理(17.04 t CO₂e·hm^-2·a^-1).

Abstract: CO₂, N₂O and CH₄ are important greenhouse gases, and soils in forest ecosystems are their important sources. Carya cathayensis is a unique tree species with seeds used for highgrade dry fruit and oil production. Understory vegetation management plays an important role in soil greenhouse gases emission of Carya cathayensis stands. A oneyear in situ experiment was conducted to study the effects of understory removal on soil CO₂, N₂O and CH₄ emissions in C. cathayensis plantation by closed static chamber technique and gas chromatography method. Soil CO₂ flux had a similar seasonal trend in the understory removal and preservation treatments, which was high in summer and autumn, and low in winter and spring. N₂O emission occurred mainly in summer, while CH₄ emission showed no seasonal trend. Understory removal significantly decreased soil CO₂ emission, increased N₂O emission and CH₄ uptake, but had no significant effect on soil water soluble organic carbon and microbial biomass carbon. The global warming potential of soil greenhouse gases emitted in the understory removal treatment was 15.12 t CO₂e·hm^-2·a^-1, which was significantly lower than that in understory preservation treatment (17.04 t CO₂e·hm^-2·a^-1).

刘娟1,2,陈雪双1,2,吴家森1,2,姜培坤1,2,周国模1,2**,李永夫1,2. 剔除杂草对山核桃林地土壤温室气体排放的影响[J]. 应用生态学报.

LIU Juan1,2, CHEN Xue-shuang1,2, WU Jia-sen1,2, JIANG Pei-kun1,2, ZHOU Guo-mo1,2, LI Yong-fu1,2. Effects of understory removal on soil greenhouse gas emissions in Carya cathayensis stands.[J]. Chinese Journal of Applied Ecology.