Annual methane uptake by temperate semiarid steppes as regulated by stocking rates, aboveground plant biomass and topsoil air permeability
Annual methane uptake by temperate semiarid steppes as regulated by stocking rates, aboveground plant biomass and topsoil air permeability
复制标题
温带半干旱草原的年甲烷吸收量受载畜率、地上植物生物量和表土透气性的调节
DOI：
10.1111/j.1365-2486.2011.02444.x
复制
发表时间：
2011-09-01
影响因子：
11.6
通讯作者：
Han, Xingguo
中科院分区：
文献类型：
--
作者：
Chen, Weiwei;Wolf, Benjamin;Han, Xingguo
过度放牧导致的温带半干旱草原退化可能会影响土壤对大气甲烷(CH4)的吸收。然而，以前的研究主要集中在生长季节和单一放牧模式上。因此，与各种放牧措施相比，草原对CH4年吸收的反应是不确定的。在这项研究中，我们研究了放牧对两个典型的欧亚半干旱草原(大针茅草原和羊草草原)年CH4吸收的影响。使用静态箱和气相色谱在12个主要不同放牧强度的野外地点测量了全年的CH4通量。结果表明，草原土壤全年为CH4汇。年CH4吸收与放牧率相关，而CH4吸收的季节性主要受温度的影响。所有站点的CH4年平均吸收为3.7+/-0.7 kgCha(-1)yr(-1)(范围：2.3-4.5)，其中约35%(范围：23-40%)发生在非生长季。轻至中度放牧(载畜率
Overgrazing-induced degradation of temperate semiarid steppes may affect the soil sink for atmospheric methane (CH4). However, previous studies have primarily focused on the growing season and on single grazing patterns. Thus, the response of annual CH4 uptake by steppes compared with various grazing practices is uncertain. In this study, we investigated the effects of grazing on the annual CH4 uptake by two typical Eurasian semiarid steppes (the Stipa grandis steppe and the Leymus chinensis steppe) located in Inner Mongolia, China. The CH4 fluxes were measured yearround using static chambers and gas chromatography at 12 field sites that differed primarily in grazing intensities. Our results indicated that steppe soils were CH4 sinks throughout the year. The annual CH4 uptake correlated with stocking rates, whereas the seasonality of CH4 uptake was primarily dominated by temperature. The annual CH4 uptake at all sites averaged 3.7 +/- 0.7 kgCha(-1) yr(-1) (range: 2.3-4.5), where approximately 35% (range: 23-40%) occurred during the nongrowing season. Light-to-moderate grazing (stocking rate