Methane emissions from the trunks of living trees on upland soils
作 者：Wang ZP*, Gu Q, Deng FD, Huang JH, Megonigal JP, Yu Q, Lu XT, Li LH, Chang S, Zhang YH, Feng JC, Han XG*
影响因子：7.210
刊物名称：New Phytologist
出版年份：2016
卷：211 期：2 页码：429-439
论文摘要：
Upland forests are traditionally thought to be net sinks for atmospheric methane (CH4). In such forests,in situCH4fluxes on tree trunks have been neglected relative to soil and canopy fluxes.
We measuredin situCH4fluxes from the trunks of living trees and other surfaces, such as twigs and soils, using a static closed-chamber method, and estimated the CH4budget in a temperate upland forest in Beijing.
We found that the trunks ofPopulus davidianaemitted large quantities of CH4during July 2014–July 2015, amounting to mean annual emissions of 85.3 and 103.1 μg m−2 h−1on a trunk surface area basis on two replicate plots. The emission rates were similar in magnitude to those from tree trunks in wetland forests. The emitted CH4was derived from the heartwood of trunks. On a plot or ecosystem scale, trunk CH4emissions were equivalent toc. 30–90% of the amount of CH4consumed by soils throughout the year, with an annual average of 63%.
Our findings suggest that wet heartwoods, regardless of rot or not, occur widely in living trees on various habitats, where CH4can be produced.
