青海湖源头湿地热卡洼地带土壤呼吸作用对温度和湿度的响应

Biology Pub Date : 2024-06-14 DOI:10.3390/biology13060437
Yahui Mao, Kelong Chen, Wei Ji, Yanli Yang
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引用次数: 0

摘要

随着气候变暖,永久冻土活动层增厚,导致永久冻土融化和地表塌陷,形成热喀斯特地貌。这些变化极大地影响了区域植被、土壤理化性质和水文过程,从而加剧了区域碳循环。本研究分析了青海湖源头湿地热卡洼地带土壤呼吸速率(Rs)、土壤温度(T)和体积含水量(VWC)之间的关系,揭示了它们对这些土壤参数的影响。结果表明,土壤温度与 Rs 呈显著正相关(p < 0.001),体积含水量与 Rs 呈显著负相关(p < 0.001)。在恒温洼地带,VWC 对 Rs 的抑制作用比自然条件下更强(p < 0.05)。单因子模型表明,温度驱动模型对温带洼陷区(R2 = 0.509)和自然条件下(R2 = 0.414)Rs 变化的解释力较高,而湿度驱动模型的解释力较低。双因子模型进一步提高了解释力,在恒温洼地带的解释力略有提高。这表明温度和湿度共同驱动 Rs。此外,在白天,温度对自然条件下的 Rs 有更显著的影响,而 VWC 的增加则会抑制 Rs。温带洼陷区和自然条件下 Rs 的温度敏感性(Q10)值分别为 3.32 和 1.80,表明温带洼陷区夜间对温度变化的敏感性更高。该研究揭示了青海湖源头湿地恒温洼陷区土壤呼吸作用对温度和湿度反应的复杂性,有助于理解湿地生态系统的碳循环和预测气候变化下的湿地碳排放。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The Response of Soil Respiration to Temperature and Humidity in the Thermokarst Depression Zone of the Headwater Wetlands of Qinghai Lake
As the climate warms, the thickening of the active layer of permafrost has led to permafrost melting and surface collapse, forming thermokarst landforms. These changes significantly impact regional vegetation, soil physicochemical properties, and hydrological processes, thereby exacerbating regional carbon cycling. This study analyzed the relationship between soil respiration rate (Rs), soil temperature (T), and volumetric water content (VWC) in the thermokarst depression zone of the headwater wetlands of Qinghai Lake, revealing their influence on these soil parameters. Results showed a significant positive correlation between soil temperature and Rs (p < 0.001), and a significant negative correlation between VWC and Rs (p < 0.001). The inhibitory effect of VWC on Rs in the thermokarst depression zone was stronger than under natural conditions (p < 0.05). Single-factor models indicated that the temperature-driven model had higher explanatory power for Rs variation in both the thermokarst depression zone (R2 = 0.509) and under natural conditions (R2 = 0.414), while the humidity-driven model had lower explanatory power. Dual-factor models further improved explanatory power, slightly more so in the thermokarst depression zone. This indicates that temperature and humidity jointly drive Rs. Additionally, during the daytime, temperature had a more significant impact on Rs under natural conditions, while increased VWC inhibited Rs. At night, the positive correlation between Rs and temperature in the thermokarst depression zone increased significantly. The temperature sensitivity (Q10) values of Rs were 3.32 and 1.80 for the thermokarst depression zone and natural conditions, respectively, indicating higher sensitivity to temperature changes at night in the thermokarst depression zone. This study highlights the complexity of soil respiration responses to temperature and humidity in the thermokarst depression zone of Qinghai Lake’s headwater wetlands, contributing to understanding carbon cycling in wetland ecosystems and predicting wetland carbon emissions under climate change.
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