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Greenhouse gas emissions from termite mounds greenhouse gas emissions from termite mounds in a transition area between the Cerrado Savanna and the Atlantic Forest in Brazil
Acta Oecologica ( IF 1.8 ) Pub Date : 2020-12-16 , DOI: 10.1016/j.actao.2020.103690
Helio Danilo Quevedo , Carolina Braga Brandani , Camila Bolfarini Bento , Leonardo Machado Pitombo , Pedro José Ferreira Filho , Janaina Braga do Carmo

The contribution of termites to the global balance of greenhouse gases, which is aggravated by large seasonal variations in their emissions, remains unclear. The objectives of this study were to evaluate the influence of termite mounds on CH4, CO2 and N2O emissions and to analyze their diurnal variations over a 9-month (249-day) period in a transition area of the Cerrado Savanna and Atlantic Forest biomes in Brazil where the current land use was a non-managed pasture. We used transects to estimate greenhouse gas emissions across the study area. The results revealed that soils settled by termites emitted more CH4 than they consumed, exhibiting 113% higher CH4 emissions than soils without termites, which emitted an estimated 10.09 g of CH4 ha−1 day−1 on average. The wood-feeding Cornitermes sp., the most abundant species in the mounds area analyzed in the experiment, accounted for 83.12% and 83.09% of the CH4 and CO2 fluxes. Extrapolating our results to non-managed Brazilian pastures, CH4 emissions arising termite mounds could reach up to 6.25 Tg ha−1 yr−1. The results of this study reveal that tropical pastures in transition areas between Cerrado and Atlantic Forest biomes infested by termite mounds can greatly contribute to increased CH4 emissions and should be considered in the inventory of greenhouse gas emissions.



中文翻译:

白蚁丘的温室气体排放量巴西塞拉多萨凡纳和大西洋森林之间的过渡地区白蚁丘的温室气体排放量

目前尚不清楚白蚁对温室气体全球平衡的贡献,而温室气体的全球季节性平衡加剧了白蚁的排放。这项研究的目的是评估白蚁丘对Cerrado Savanna和Cerrado Savanna过渡区9个月(249天)期间CH 4,CO 2和N 2 O排放的影响,并分析其昼夜变化。巴西的大西洋森林生物群落,目前的土地使用是非管理牧场。我们使用样带来估算整个研究区域的温室气体排放量。结果表明,以白蚁定居的土壤排放的CH 4超过消耗的CH 4,其CH 4含量高113%与没有白蚁的土壤相比,土壤的平均排放量估计为10.09 g CH 4 ha -1 day -1。以木料喂食的Cornitermes sp。(在实验中分析的土丘区域中最丰富的物种)占CH 4和CO 2通量的83.12%和83.09%。将我们的结果推论到未经管理的巴西牧场,白蚁丘产生的CH 4排放可能高达6.25 Tg ha -1 yr -1。这项研究的结果表明,在白蚁丘侵染的塞拉多和大西洋森林生物群落之间的过渡地区中的热带牧场可以极大地促进CH 4的增加。 排放,应在温室气体排放清单中予以考虑。

更新日期:2020-12-16
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