生物炭修正案减轻了土壤微生物和的限制,并在亚热带森林中长期输入下增加了土壤异质性呼吸
Quan Li1, Hangxiang Ji1, Chao Zhang1
1State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Hangzhou 311300, China.
The Science of the total environment
|August 31, 2024
概括
长期添加和生物炭会改变土壤微生物资源限制和异质呼吸 (Rh). 生物炭添加减轻了营养限制并增加了Rh,而添加增强了限制并减少了Rh.
科学领域:
- 土壤科学 土壤科学
- 微生物学 微生物学
- 生态生态学 生态生态学
背景情况:
- (N) 和碳 (C) 输入对土壤微生物功能产生重大影响.
- 长期添加N和C对土壤微生物资源限制和异质呼吸 (Rh) 的影响尚未完全理解.
- 了解这些影响对于预测全球变化下的土壤C动态至关重要.
研究的目的:
- 调查土壤微生物资源限制和Rh对7年N和生物炭 (BC) 添加的反应.
- 确定土壤微生物资源限制的主要驱动因素.
- 评估微生物资源限制对Rh的预测能力.
主要方法:
- 用八种治疗方法进行实地实验:对照,N增剂 (30,60,90公斤N·hm−2·a−1),BC增剂 (20BC·hm−2),N+BC组合治疗.
- 测量包括土壤微生物资源限制,异构呼吸 (Rh),C使用效率以及C-和N-获取酶活动.
- 统计分析以确定主导驱动因素和预测关系.
主要成果:
- 土壤微生物被N和 (P) 共同限制,对照处理中没有C限制.
- 长期的N添加增强了微生物N和P限制,并减少了Rh15.120.0%.
- BC修改减轻了N和P限制,降低了C使用效率10.942.1%,并增加了Rh33.691.6%.
- 土壤的C和N获取酶活动是微生物资源限制的关键驱动因素.
- 微生物资源的限制比土壤资源或微生物生物质更可靠地预测Rh.
结论:
- 长期的N和BC添加通过改变微生物资源限制来影响Rh.
- 微生物资源的限制在调节土壤C循环方面发挥着重要作用.
- 这些发现强调了在环境变化和土壤C动态的背景下考虑微生物资源限制的重要性.
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