Plant identity and evenness affect yield and trace gas exchanges in forage mixtures
Plant identity and evenness affect yield and trace gas exchanges in forage mixtures
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DOI：
10.1007/s11104-015-2407-7
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发表时间：
2015-02
期刊：
影响因子：
4.9
通讯作者：
À. Ribas;R. Llurba;F. Gouriveau;N. Altimir;John Connolly;M. Sebastià
中科院分区：
文献类型：
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作者：
À. Ribas;R. Llurba;F. Gouriveau;N. Altimir;John Connolly;M. Sebastià
目的探讨混合饲料中植物多样性对产量和温室气体交换的潜在影响，确定功能之间的潜在互惠关系。2013)，我们分析了田间试验的结果，其中三种牧草(一种草、一种豆科植物和一种非豆科牧草)的相对播种比例发生了变化，以获得物种比例和均匀度的梯度。测定了土壤中N_2O、CH_4、NH_3、CO_2的交换速率、牧草产量和土壤无机氮含量。我们在草地建立4年后，在预期的最高排放时期进行了气体测量。结果支持了排放速率受植物多样性影响的假说。播种均匀度降低了N2O的交换速率，对CH4也有类似的负面影响。植物成分影响气体交换，豆类单种作物对所有气体的排放率最高。多样性还增加了产量，并调节了土壤中NO3、−和NH4+的浓度。结论综合分析产量和排放对物种多样性的响应，可以确定这两种功能都得到优化的物种比例范围。豆科牧草系统的多样化有助于缓解气候变化，同时提高生态系统生产力。
AimsWe explore the potential effect of plant diversity on yield and greenhouse gas exchanges in forage mixtures, identifying potential co-benefits between functions.MethodsUsing the biodiversity-ecosystem function (BEF) modelling framework (Connolly et al. 2013), we analyse results from a field experiment where the relative sown proportion of three forage species (a grass, a legume, and a non-legume forb) was varied to obtain a gradient in species proportions and evenness. The exchange rates of N2O, CH4, NH3and CO2were measured, together with forage yield and soil inorganic N content. We conducted gas measurements 4 years after sward establishment during the expected period of highest emissions.ResultsResults support the hypothesis that emission rates are affected by plant diversity. Sown evenness was found to decrease N2O exchange rates, and some evidence was found for a similar negative effect on CH4. Plant composition affected gas exchanges, with legume monocultures showing the highest emission rates for all gases. Diversity also increased yield and modulated NO3−and NH4+soil concentrations.ConclusionsThe integrated analysis of yield and emission response to species diversity allows the identification of a range of species proportions for which both functions are optimized. Diversifying forage legume-based systems could contribute to mitigation while improving ecosystem productivity.