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Effects of seeding ratios and nitrogen fertilizer on ecosystem respiration of common vetch and oat on the Tibetan plateau

机译：播种量和氮肥对青藏高原普通紫o燕麦生态系统呼吸的影响。

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Background and aims: Few studies have investigated the effect of nitrogen (N) fertilizer on ecosystem respiration (Re) under mixed legume and grass pastures sown at different seeding ratios,and data are almost entirely lacking for alpine meadow of the Tibetan Plateau. Our aim was to test the hypothesis that although a combination of legumes with grass and N fertilizer increases Re the combination decreases Re intensity (i.e. Re per unit of aboveground biomass) due to greater increases in aboveground biomass compared to increases in Re. Methods: This hypothesis was tested using different seeding ratios of common vetch (Vicia sativa L.) and oat (Avena sativa L.) with and without N fertilizer on the Tibetan plateau in 2009 and 2010. Re was measured using a static closed opaque chamber. Re intensity was estimated as the ratio of seasonal average Re during the growing season to aboveground biomass. Results: Compared with common vetch monoculture pasture, mixed legume-grass pastures only significantly decreased Re intensity (with a decrease of about 75%-87%) in the drought year 2009 due to greater increases in aboveground biomass compared to increases in Re. There were no significant differences in Re and Re intensity among different seeding ratios of oat and common vetch in either year. N fertilizer significantly decreased Re intensity for common vetch monoculture pasture by 24.5% in 2009 and 69.5% in 2010 although it did not significantly affect plant production and Re. Conclusions: From the perspective of forage yield and Re, planting mixed legume-grass pastures without N fertilizer is a preferable way to balance the twin objectives of forage production and mitigation of atmospheric greenhouse gas emissions in alpine regions.
机译：背景与目的：很少有研究调查在不同播种比例下种植的豆类和草混合草场下氮（N）肥对生态系统呼吸（Re）的影响，并且几乎完全缺乏青藏高原高寒草甸的数据。我们的目的是检验以下假设：尽管豆科植物与草和氮肥的组合增加了Re，但由于与Re的增加相比，地上生物量的增加更大，因此该组合降低了Re强度（即每单位地上生物量的Re）。方法：于2009年和2010年，在青藏高原上，使用有和没有氮肥的普通紫etch（Vicia sativa L.）和燕麦（Avena sativa L.）的不同播种率对这一假设进行了测试。 。 intensity的强度估计为生长季节的季节平均Re与地上生物量的比值。结果：与普通紫菜单一牧草牧场相比，豆科牧草混合牧场在2009年干旱年份仅显着降低了Re强度（降低了75％-87％），这是由于地上生物量的增加大于Re的增加。燕麦和普通紫etch不同播种比例下，Re和Re强度在一年中均无显着差异。氮肥虽然不显着影响植物的产量和稀土元素，但在2009年和2010年使普通紫菜单草牧场的稀土元素强度显着降低了24.5％和69.5％。结论：从牧草产量和稀土的角度来看，种植不含氮肥的豆科牧草混合牧草是平衡牧草生产和缓解高寒地区大气温室气体排放双重目标的一种较好方法。

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