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Priming of Soil Carbon Decomposition in Two Inner Mongolia Grassland Soils following Sheep Dung Addition: A Study Using 13C Natural Abundance Approach

机译：添加绵羊粪便后两种内蒙古草原土壤碳分解的启动作用：使用13C自然丰度方法的研究

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To investigate the effect of sheep dung on soil carbon (C) sequestration, a 152 days incubation experiment was conducted with soils from two different Inner Mongolian grasslands, i.e. a Leymus chinensis dominated grassland representing the climax community (2.1% organic matter content) and a heavily degraded Artemisia frigida dominated community (1.3% organic matter content). Dung was collected from sheep either fed on L. chinensis (C3 plant with δ13C = −26.8‰; dung δ13C = −26.2‰) or Cleistogenes squarrosa (C4 plant with δ13C = −14.6‰; dung δ13C = −15.7‰). Fresh C3 and C4 sheep dung was mixed with the two grassland soils and incubated under controlled conditions for analysis of 13C-CO2 emissions. Soil samples were taken at days 17, 43, 86, 127 and 152 after sheep dung addition to detect the δ13C signal in soil and dung components. Analysis revealed that 16.9% and 16.6% of the sheep dung C had decomposed, of which 3.5% and 2.8% was sequestrated in the soils of L. chinensis and A. frigida grasslands, respectively, while the remaining decomposed sheep dung was emitted as CO2. The cumulative amounts of C respired from dung treated soils during 152 days were 7–8 times higher than in the un-amended controls. In both grassland soils, ca. 60% of the evolved CO2 originated from the decomposing sheep dung and 40% from the native soil C. Priming effects of soil C decomposition were observed in both soils, i.e. 1.4 g and 1.6 g additional soil C kg−1 dry soil had been emitted as CO2 for the L. chinensis and A. frigida soils, respectively. Hence, the net C losses from L. chinensis and A. frigida soils were 0.6 g and 0.9 g C kg−1 soil, which was 2.6% and 7.0% of the total C in L. chinensis and A. frigida grasslands soils, respectively. Our results suggest that grazing of degraded Inner Mongolian pastures may cause a net soil C loss due to the positive priming effect, thereby accelerating soil deterioration.
机译：为了研究绵羊粪便对固碳（C）固存的影响，对来自两个不同内蒙古草原的土壤进行了152天的温育实验，即代表高潮群落的羊草为主的草原（有机质含量为2.1％）和严重退化的冷蒿占主导地位的社区（有机物含量为1.3％）。粪便是从用中华绒螯蟹（C3植物，δ 13 C = −26.8‰；粪便δ 13 C = −26.2‰）饲喂的绵羊上或采到的油菜上的。 C4植物的δ 13 C =;-14.6‰;粪便δ 13 C = -15.7‰）。将新鲜的C3和C4羊粪与两种草原土壤混合，并在受控条件下孵育以分析 13 C-CO2排放。在添加羊粪后第17、43、86、127和152天采集土壤样品，以检测土壤和粪便中的δ 13 C信号。分析表明，绵羊粪便C的分解量为16.9％和16.6％，其中分别有3.5％和2.8％的粪便被隔离在中华羊草和A. frigida草原的土壤中，而剩余的分解粪便则以CO2的形式排放。 。在152天内从粪便处理过的土壤中呼吸的C的累积量比未经修正的对照高7-8倍。在两种草原土壤中，释放出的二氧化碳中有60％来自腐烂的羊粪，有40％来自天然土壤C。在两种土壤中均观察到土壤C分解的启动作用，即分别增加了1.4 g和1.6 g土壤C kg −1 旱地土壤分别以L. chinensis和A. frigida土壤作为CO2排放。因此，中华绒螯蟹和A. frigida土壤的净碳损失分别为0.6 g和0.9 g C kg -1 土壤，分别占中华绒螯蟹和中华绒螯蟹总C的2.6％和7.0％。寒地草原土壤。我们的研究结果表明，退化的内蒙古草场由于积极的启动效应可能会导致土壤碳净流失，从而加速土壤退化。

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