Soil Type and a Labile C Addition Regime Control the Temperature Sensitivity of Soil C and N Mineralization More than N Addition in Wetland Soils in China
Soil Type and a Labile C Addition Regime Control the Temperature Sensitivity of Soil C and N Mineralization More than N Addition in Wetland Soils in China
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DOI：
10.3390/atmos11101043
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发表时间：
2020-09
期刊：
影响因子：
2.9
通讯作者：
Chunmei Wang;Yun-Yu Zhang;Yun Li
中科院分区：
文献类型：
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作者：
Chunmei Wang;Yun-Yu Zhang;Yun Li
湿地储存了大量的碳（C），许多湿地容易受到潜在的全球变暖的影响。定量研究不同类型湿地土壤氮素和碳矿化对外界不稳定碳或氮的温度敏感性至关重要。以三江平原湿地（SW）、若尔盖高寒湿地（ZW）、黄河口湿地（YW）和白洋淀湿地（BL）为研究对象，通过室内培养试验，研究了温度和氮、碳添加量对土壤碳、氮矿化的影响。研究结果表明，温度、有效碳和湿地类型是影响土壤碳流失的主导因素，SW和ZW土壤碳稳定性较差，对温度升高的抵抗能力较差。氮素净矿化对施氮量的响应存在区域差异。缺乏长期的影响，沉积的N对土壤矿化的建议，可能有一个特定的N添加阈值水平改变C和N矿化。据预测，增加不稳定的C供应，由于升高的二氧化碳（CO2）及其与湿地类型的相互作用将增加CO2流出超过湿地土壤中的N沉积。
Wetlands store a large amount of carbon (C) and many are vulnerable to potential global warming. It is critical to quantify the temperature sensitivity of soil nitrogen (N) and C mineralization in response to external labile C or N addition in different types of wetland. Through incubation experiments, the effects of temperature and the addition of N or C on soil C and N mineralization were tested using soils from the Sanjiang Plain wetland (SW), Zoigê alpine wetland (ZW), Yellow River estuary wetland (YW), and Baiyangdian Lake (BL). Our findings showed that temperature, available C and wetland type were dominant factors in the regulation of soil C loss, with soil C in SW and ZW being less stable and poorly resistant to increases in temperature. The response of net N mineralization to N addition showed regional differences. A lack of long-term effects of the deposition of N on soil mineralization suggested that there may be a particular N addition threshold level for changed C and N mineralization. It is predicted that an increase in labile C supply due to elevated carbon dioxide (CO2) and its interactions with wetland types will increase CO2 efflux more than N deposition in wetland soils.