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Chao Guan^1,2, Changming Zhao^1,2, Marina Dacal^3,4

¹State Key Laboratory of Herbage Improvement and Grassland Agro-ecosystems, College of Ecology, Lanzhou University, Lanzhou, Gansu 730000, China.

Geoderma

|July 2, 2025

概括

长期变暖对干旱地区的土壤呼吸有不同的影响. 虽然在生物覆盖较低的情况下,影响是暂时的,但在生物覆盖较高的地方,变暖会长期抑制呼吸,突出显示生态系统的复杂性.

科学领域:

生态生态学生态生态学
气候变化研究气候变化研究
干旱地区生态系统

背景情况:

气候变暖对土壤呼吸的影响因时间尺度和生态系统而异.
长期变暖影响 (>10年) 在生物占主导地位的干旱地区没有得到充分研究.
土壤呼吸是碳循环和气候反中的一个关键过程.

研究的目的:

研究实验性变暖对干旱地区土壤呼吸的长期影响.
为了确定土壤在变暖下呼吸的基本调节机制.
评估生物覆盖对变暖反应和土壤有机碳 (SOC) 积累的影响.

主要方法:

在西班牙东南部的旱地生态系统中进行了10-13年的实验性变暖研究.
在具有不同生物覆盖的微站点测量了土壤呼吸率.
分析了土壤有机碳 (SOC) 库存和碳降解酶活动 (例如β-葡萄糖酶,β-D-细胞生物酶).

主要成果:

由于变暖而导致的土壤呼吸减少在生物覆盖较低的地点是暂时的.
长期的气候变暖在高生物覆盖地区持续抑制了土壤呼吸.
SOC积累率没有受到变暖或生物覆盖的显著影响.

结论:

长期变暖对高生物层覆盖干旱地区的土壤呼吸有持续的抑制作用.
土壤呼吸动力学由低生物位的SOC库存和酶活性以及高生物位的生物覆盖来调节.
长期研究对于理解复杂的生态系统对气候变化的反应和完善碳气候反预测至关重要.

关键词:

生物皮层是生物皮层.干旱地区是干旱地区.酶活性的酶活性.长期变暖长期变暖土壤呼吸系统土壤呼吸系统

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