深度削弱了长期受精对溶解有机物和米土壤中的化学多样性的影响
Xueying Feng1, Xiaomin Wang2, Zhijun Wei2
1State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 211135, China; University of Chinese Academy of Sciences, Beijing 100049, China; Changshu National Agro-Ecosystem Observation and Research Station, Institute of Soil Science, Chinese Academy of Sciences, 211135 Nanjing, China.
The Science of the total environment
|December 25, 2024
概括
长期施肥,包括草回收,提高了土壤表层中溶解有机物 (DOM) 的多样性. 微生物活动驱动DOM变化,多样性随着土壤深度的下降而减少.
科学领域:
- 土壤科学 土壤科学
- 生物地质化学生物地质化学
- 微生物生态学 微生物生态学
背景情况:
- 溶解有机物 (DOM) 对土壤健康和生态系统功能至关重要.
- 长期受精对土壤DOM化学多样性和土壤特征中的微生物群落的影响尚不清楚.
研究的目的:
- 在各种长期施肥方案下,研究在土中的DOM组成和微生物群落.
- 确定受精如何影响DOM化学多样性及其与土壤深度内的微生物群落的关系.
- 澄清影响DOM分子组成的因素,垂直地在土壤特征内.
主要方法:
- 里叶变换离子循环子子共振质谱 (FT-ICR MS) 用于DOM分析.
- 高通量测序用于微生物社区概况.
- 在不同的肥料处理 (Control,NPK,NPKHS,NPKS) 下,在不同的土壤层 (0-100厘米) 上进行分析.
主要成果:
- 施肥显著增加了土壤的总碳 (TC),总 (TN) 和酸盐 (NO3-) 含量,特别是在表层土壤中.
- 随着土壤深度的增加,DOM的化学多样性和细菌多样性下降.
- 施肥,特别是草回收 (NPKHS,NPKS),增强了土壤表层 (0-20厘米) 的DOM化学多样性,但在这个层以下的影响有限.
- 微生物分解被确定为DOM构成变化的主要驱动因素.
结论:
- 长期的NPK施肥和草回收通过改变土壤营养含量,增强了DOM化学多样性,主要是在表土中.
- 微生物群落在塑造整个土壤特征的DOM分子组成方面发挥着关键作用.
- 了解垂直DOM成分对于田土壤管理和生态系统稳定至关重要.
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