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土壤碳池质量和稳定性通过叶子和根分解的调节中的差异

Jia Zeng¹, Xiangyang Li¹, Junnan Jian¹

¹College of Agronomy, Northwest Agriculture & Forestry University, Yangling, 712100, China; Shaanxi Engineering Research Center of Circular Agriculture, Yangling, 712100, Shaanxi, China.

Environmental research

|November 4, 2024

概括

叶子垃圾比根垃圾更快地分解,增加了土壤碳池. 然而,根垃圾可能提供更长期的土壤碳池稳定性,增强生态系统的健康.

科学领域:

土壤生态学土壤生态学
生物地质化学生物地质化学
生态系统科学生态系统科学

背景情况:

垃圾分解对土壤生态系统至关重要,影响碳循环和土壤特性.
了解叶子垃圾与根垃圾对土壤碳池和稳定性的差异影响仍然是一个关键的研究缺口.

研究的目的:

研究土壤生物物理和化学特性对垃圾分解率的影响.
阐明土壤碳池的动态及其在不同垃圾类型下的稳定性.
确定调节垃圾分解和土壤碳池反应的关键因素.

主要方法:

在半干旱的草原上进行了450天的现场分解实验.
分析了分解速度 (K) 和垃圾质量影响.
评估了土壤酶活性,微生物生物质碳 (MBC),有机颗粒碳 (POC),溶解有机碳 (DOC),土壤有机碳 (SOC),矿物相关有机碳 (MAOC) 和土壤碳池管理指数 (CPMI).
利用随机森林,部分相关性和路径分析来确定调节因素.

主要成果:

叶子垃圾的分解速度明显快于根垃圾,垃圾质量是两者的主要驱动因素.
叶子垃圾的分解增强了土壤酶活动 (白氨基酶,β-1,4-葡萄糖酶) 并积累了MBC,POC和DOC.
根垃圾的分解显著增加了MAOC和MAOC/POC比率,表明土壤碳池稳定性得到了增强,而叶垃圾则降低了这些指标.
这两种垃圾类型都增加了土壤碳储存和CPMI,而叶子垃圾的初始增加更高.

结论:

叶子和根的垃圾都有助于土壤的碳储存,并提高了土壤碳池管理指数.
根垃圾的分解似乎更有利于土壤碳池的长期稳定性,因为它增加了与矿物相关的有机碳.
垃圾质量是分解速度和随后的土壤碳动态的关键决定因素,而分解时间和土壤碳成分影响CPMI.

关键词:

碳池管理指数是指碳池管理指数.碳的稳定性碳的稳定性叶子垃圾 - 叶子垃圾垃圾分解垃圾分解草根垃圾 - - 草根垃圾是一种

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