The impact of ploughing intensively managed temperate grasslands on N2O, CH4 and CO2 fluxes
The impact of ploughing intensively managed temperate grasslands on N2O, CH4 and CO2 fluxes
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DOI：
10.1007/s11104-016-3023-x
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发表时间：
2017-02-01
期刊：
影响因子：
4.9
通讯作者：
Skiba, U. M.
中科院分区：
文献类型：
--
作者：
Drewer, J.;Anderson, M.;Skiba, U. M.
温带草原是全球农业生产系统的重要组成部分，也是生物圈和大气之间温室气体交换的主要贡献者。在欧洲西北部，许多集中管理的放牧草地偶尔会被翻耕和重新开垦，以提高其生产力。在这里，我们研究了翻耕对温室气体排放的影响草地。为了研究这些相互作用，我们测量了土壤温室气体通量使用静态箱法除了净生态系统交换（NEE）的CO2涡动协方差从两个相邻字段。在2012年和2014年分别开垦一片草地和另一片草地之前，这些密集放牧草地的管理几乎相同，并且是研究区域的典型。对N2O的影响很小，但与氮肥、土壤温度和土壤湿度的影响不同。耕作引起的N2O通量接近预期的IPCC默认方法的基础上。到目前为止，对温室气体平衡的主要影响是GPP的暂时减少。因此，在估算定期翻耕草地的温室气体通量或预算时，应考虑耕作引起的通量。
Temperate grasslands are a globally important component of agricultural production systems and a major contributor to the exchange of greenhouse gases (GHG) between the biosphere and atmosphere. Many intensively managed grazed grasslands in NW Europe are ploughed and reseeded occasionally in order to improve their productivity. Here, we examined the impact of ploughing on the emission of GHGs a grassland.To study these interactions we measured soil GHG fluxes using the static chamber method in addition to the net ecosystem exchange (NEE) of CO2 by eddy covariance from two adjacent fields. Until ploughing one field in 2012 and the other in 2014, management of these intensively grazed grasslands was almost the same and typical for the study region.The effect on N2O is small, but distinguishable from the effects of N fertilisation, soil temperature and soil moisture. Tillage-induced N2O fluxes were close to expectations based on the IPCC default methodology. By far the dominant effect on the GHG balance was the temporary reduction in GPP.Ploughing and reseeding can substantially influence short-term GHG emissions. Therefore tillage-induced fluxes ought to be considered when estimating greenhouse gas fluxes or budgets from grasslands that are periodically ploughed.