当前位置: X-MOL 学术Catena › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Plateau pika offsets the positive effects of warming on soil organic carbon in an alpine swamp meadow on the Tibetan Plateau
Catena ( IF 5.4 ) Pub Date : 2021-05-06 , DOI: 10.1016/j.catena.2021.105417
Xia Yuan , Wenkuan Qin , Ying Chen , Tianle Xu , Kelong Chen , Biao Zhu

Both climate warming and plateau pika (Ochotona curzoniae) exert considerable impacts on carbon cycling in alpine ecosystems on the Tibetan Plateau. However, the interaction of warming and pika disturbance on soil organic carbon (SOC) dynamics in alpine ecosystems remains largely unknown. Here, we measured plant, soil and microbial properties after four-year warming in a swamp meadow (with or without pika disturbance) on the Tibetan Plateau. Our results showed that in non-pika plots, warming not only increased plant belowground biomass (48%), but also enhanced microbial biomass, hydrolytic enzyme activities, and bacterial functional genes (41–46%). More plant inputs likely outweighed faster microbial decomposition, leading to the accumulation of fast-cycling particulate organic carbon (POC, 49%) and bulk SOC (22%), but not slow-cycling mineral-associated organic carbon (MAOC). In pika-disturbed plots, however, warming did not significantly change plant belowground biomass (which dominates total plant biomass), microbial biomass and hydrolytic enzyme activities. Although bacterial functional genes were suppressed (−40%) and plant aboveground biomass was increased (118%), oxidative enzymes were significantly stimulated (17%), which likely counteracted the higher aboveground plant inputs and led to minor changes in soil carbon pools (SOC, POC and MAOC) with warming. Moreover, bacterial and fungal community structure were significantly altered by pika disturbance, but not warming. Overall, these findings demonstrated that pika disturbance could offset the short-term positive effect of warming on soil organic carbon in the alpine swamp meadow ecosystem.



中文翻译:

高原鼠兔抵消了变暖对青藏高原高山沼泽草甸土壤有机碳的积极影响

气候变暖和高原皮卡(Ochotona curzoniae)对青藏高原高山生态系统的碳循环产生重大影响。然而,变暖和皮卡干扰对高山生态系统中土壤有机碳(SOC)动力学的相互作用仍然未知。在这里,我们测量了青藏高原沼泽草甸(有或没有皮卡扰动)四年变暖后的植物,土壤和微生物特性。我们的结果表明,在非皮卡区,变暖不仅增加了植物地下生物量(48%),而且还增强了微生物生物量,水解酶活性和细菌功能基因(41–46%)。更多的工厂投入可能超过了更快的微生物分解速度,导致了快速循环的颗粒有机碳(POC,49%)和大容量SOC(22%)的积累,而不是慢速循环的矿物相关有机碳(MAOC)的积累。在受到皮卡困扰的地块中,然而,变暖并没有显着改变植物地下生物量(主导植物总生物量),微生物生物量和水解酶活性。尽管细菌功能基因被抑制(−40%)并且植物地上生物量增加(118%),但氧化酶被显着刺激(17%),这可能抵消了地上植物的较高投入并导致土壤碳库的微小变化( SOC,POC和MAOC)。此外,皮卡扰动可显着改变细菌和真菌的群落结构,但不会变暖。总体而言,这些发现表明,皮卡扰动可能抵消了变暖对高山沼泽草甸生态系统中土壤有机碳的短期积极影响。变暖并没有显着改变植物地下生物量(占植物总生物量),微生物生物量和水解酶活性。尽管细菌功能基因被抑制(−40%)并且植物地上生物量增加(118%),但氧化酶被显着刺激(17%),这可能抵消了地上植物的较高投入并导致土壤碳库的微小变化( SOC,POC和MAOC)。此外,皮卡扰动可显着改变细菌和真菌的群落结构,但不会变暖。总体而言,这些发现表明,皮卡扰动可能抵消了变暖对高山沼泽草甸生态系统中土壤有机碳的短期积极影响。变暖并没有显着改变植物地下生物量(占植物总生物量),微生物生物量和水解酶活性。尽管细菌功能基因被抑制(−40%)并且植物地上生物量增加(118%),但氧化酶被显着刺激(17%),这可能抵消了地上植物的较高投入并导致土壤碳库的微小变化( SOC,POC和MAOC)。此外,皮卡扰动可显着改变细菌和真菌的群落结构,但不会变暖。总体而言,这些发现表明,皮卡扰动可能抵消了变暖对高山沼泽草甸生态系统中土壤有机碳的短期积极影响。尽管细菌功能基因被抑制(−40%)并且植物地上生物量增加(118%),但氧化酶被显着刺激(17%),这可能抵消了地上植物的较高投入并导致土壤碳库的微小变化( SOC,POC和MAOC)。此外,皮卡扰动可显着改变细菌和真菌的群落结构,但不会变暖。总体而言,这些发现表明,皮卡扰动可能抵消了变暖对高山沼泽草甸生态系统中土壤有机碳的短期积极影响。尽管细菌功能基因被抑制(−40%)并且植物地上生物量增加(118%),但氧化酶被显着刺激(17%),这可能抵消了地上植物的较高投入并导致土壤碳库的微小变化( SOC,POC和MAOC)。此外,皮卡扰动可显着改变细菌和真菌的群落结构,但不会变暖。总体而言,这些发现表明,皮卡扰动可能抵消了变暖对高山沼泽草甸生态系统中土壤有机碳的短期积极影响。POC和MAOC)。此外,皮卡扰动可显着改变细菌和真菌的群落结构,但不会变暖。总体而言,这些发现表明,皮卡扰动可能抵消了变暖对高山沼泽草甸生态系统中土壤有机碳的短期积极影响。POC和MAOC)。此外,皮卡扰动可显着改变细菌和真菌的群落结构,但不会变暖。总体而言,这些发现表明,皮卡扰动可能抵消了变暖对高山沼泽草甸生态系统中土壤有机碳的短期积极影响。

更新日期:2021-05-06
down
wechat
bug