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草地退化的斑点性降低了微生物死体含量,但增加了对土壤有机碳积累的贡献

Deng Ao¹, Baorong Wang², Yubin Wang¹

¹College of Nature Resources and Environment, Northwest A&F University, Yangling 712100, China.

The Science of the total environment

|August 28, 2024

概括

草原退化将土壤有机碳 (SOC) 从植物转移到微生物来源. 微生物死体和与素相关的土壤蛋白 (GRSP) 稳定了矿物相关有机碳 (MAOC) 形式的碳.

科学领域:

土壤科学土壤科学
生态生态学生态生态学
生物地质化学生物地质化学

背景情况:

土壤有机碳 (SOC) 由植物和微生物衍生的碳 (C) 组成,它们的比例影响着SOC的动态.
草原生态系统中SOC中的植物和微生物C的具体贡献和控制因素尚未得到充分理解.

研究的目的:

调查草原退化下植物和微生物对SOC的碳贡献的变化.
确定影响SOC组成,积累和稳定的关键因素,以应对草原退化.

主要方法:

分析作为植物和微生物生物标志物的宁和氨基糖.
量化与谷蛋白相关的土壤蛋白 (GRSP),酶活动,有机碳颗粒 (POC) 和矿物相关有机碳 (MAOC).
在灌木,退化和露露的草原地区对SOC成分进行比较分析.

主要成果:

灌木的补丁显示,由于植物投入增加,SOC和POC较高,植物衍生的碳 (烯) 积累较大.
由于植物输入减少,退化的补丁呈现出更高的微生物衍生碳 (氨基糖),POC下降的速度比MAOC更快.
草原降解导致微生物死体C和GRSP的增加,增强了MAOC中微生物衍生的C的稳定性,由GRSP凝固保护.

结论:

草原降解会改变SOC的组成,有利于微生物衍生碳稳定为MAOC.
微生物死体和GRSP在SOC形成和降解下稳定起着至关重要的作用.
考虑不同的SOC来源对于预测气候变化和人类压力下的SOC动态至关重要.

关键词:

氨基酸糖是氨基酸糖,是氨基酸糖.碳封存是一种碳封存方式.草原的退化和退化酸是酸中的一种.与矿物相关的有机碳西藏高原是西藏的高原.

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