Litter affects CO2 emission from alpine wetland soils experiencing drying-rewetting cycles with different intensities and frequencies
Litter affects CO2 emission from alpine wetland soils experiencing drying-rewetting cycles with different intensities and frequencies
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凋落物影响高山湿地土壤经历不同强度和频率的干燥-再湿润循环的二氧化碳排放
DOI：
10.1016/j.catena.2020.105025
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发表时间：
2020-11
期刊：
影响因子：
6.2
通讯作者：
Yu Feihai
中科院分区：
文献类型：
--
作者：
Liang Chen;Ding Yan;Yue Yi;Zhang Xiaoya;Song Minghua;Gao Junqin;Yu Feihai
干-复湿循环的频率和强度会影响土壤co2排放以及土壤中的碳(C)和氮(N)，但这种影响是否会因土壤凋落物的输入而改变，尤其是对高寒湿地生态系统而言，目前尚不清楚。添加1 g凋落物或不添加凋落物的土壤经历了两种频率（高vs低，即18 vs 9个周期，每个周期8 vs 16天，对应于该湿地降水频率的100% vs 50%）和两种强度（高vs低，即360 mm vs 252 mm，对应于该湿地降水的100% vs 70%）的干-再湿循环。高强度处理土壤水分高于低强度处理；凋落物添加对土壤湿度有影响，但这种影响取决于培养时间。低频率和高强度的干湿循环显著增加了co2的排放，这是由于有效底物的增加，如土壤溶解的有机碳，这可能导致土壤微生物的活性增加，如酸杆菌、变形菌、放线菌、担子菌和子囊菌。向土壤中添加凋落物增加了土壤的二氧化碳排放，可能是由于增加了持水能力和有效碳。在低强度和高频处理下，添加凋落物的土壤中无机氮、铵态氮和硝态氮浓度高于未添加凋落物的土壤，而在高强度处理下，低强度和高频处理的土壤中无机氮和硝态氮浓度均低于未添加凋落物的土壤。co2排放量与溶解有机碳浓度和土壤湿度呈正相关，与铵态氮浓度呈负相关。研究结果表明，低频率的干-再湿循环与凋落物的添加可以增加土壤co2排放量，在考虑高寒湿地土壤温室气体排放时应考虑干-再湿循环的影响。
The frequency and intensity of drying-rewetting cycles can influence soil CO2emission from the soil and carbon (C) and nitrogen (N) in the soil, but little is known about whether such effects can be altered by litter input into the soil, especially for alpine wetland ecosystems. We conducted a 144-day incubation experiment at 15 °C using the soil and litter collected from an alpine wetland on the Qinghai-Tibetan Plateau, China. The soil added with 1 g litter or not was subjected to two frequencies (high vs. low, i.e. 18 vs. 9 cycles with 8 vs. 16 days per cycle, corresponding to 100% vs. 50% of the precipitation frequency in that wetland) and two intensities (high vs. low, i.e. 360 mm vs. 252 mm, corresponding to 100% vs. 70% of precipitation in that wetland) of drying-rewetting cycles. Soil moisture was higher in the high than in the low intensity treatment; litter addition affected soil moisture, but such an effect depended on the time of incubation. Low frequency and high intensity of drying-rewetting cycles significantly enhanced CO2emission due to increases in available substrate, e.g., soil dissolved organic C, which might result in increased activity of soil microbes such asAcidobacteria,Proteobacteria,Actinobacteria,BasidiomycotaandAscomycota.Adding litter to the soil increased CO2emission from the soil likely due to increased water holding capability and labile C availability. In the low intensity and high frequency treatment concentrations of inorganic N, ammonium N and nitrate N were higher in the soil with than without litter addition, but in the high intensity treatment of both low and high frequency concentrations of inorganic N and nitrate N were lower. CO2emission was positively correlated with the concentration of dissolved organic C and soil moisture, but negatively correlated with the concentration of ammonium N. Our results suggest that low frequency of drying-rewetting cycles combined with litter addition can enhance soil CO2emission, and that effects of drying-rewetting cycles should be taken into account when we consider greenhouse gas emission from alpine wetland soils.
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