在对比的水制度下,在水田中获得的微生物策略:通过P和P追踪多个来源
Chaoqun Wang1, Michaela A Dippold2, Yakov Kuzyakov3
1State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, 710061 Xi'an, China; Biogeochemistry of Agroecosystems, University of Goettingen, 37077 Goettingen, Germany.
The Science of the total environment
|February 7, 2024
概括
麦田土壤中微生物 (P) 的获取取取决于氧化还原条件和水制. 微生物优先考虑土壤P和矿化草P而不是铁结合的P,不同的细菌群体在洪水和干燥周期下占主导地位.
科学领域:
- 土壤微生物学 土壤微生物学
- 生物地质化学生物地质化学
- 植物与微生物的相互作用
背景情况:
- 在土中 (P) 循环对于微生物生长和营养分配至关重要.
- 氧化还原条件和水系统显著影响微生物P来源的利用.
- 了解P的营业额对于在种植大米的可持续农业实践至关重要.
研究的目的:
- 为了研究微生物获取策略从不同的P来源在不同的水制度下在米土壤.
- 确定参与调动的关键微生物群体及其对环境条件的反应.
- 阐明水资源管理在优化的可用性和微生物P吸收方面的作用.
主要方法:
- 使用双 32/33 P 标签来追踪来自铁结合酸盐 (Fe-P),小麦草 P (Straw-P) 和土壤 P (Soil-P) 的.
- 评估了微生物生物质P (MBP) 和各个微生物群体内的脂 (脂-P) 中的合.
- 采用脂脂肪酸分析,将P利用与特定的功能性微生物群体在持续的洪水和交替的湿燥条件下联系起来.
主要成果:
- 微生物P营养主要通过Soil-P得到满足,人们更喜欢矿化Straw-P而不是Fe-P.
- 动态细菌 (在交替湿/干燥下) 和其他格拉姆阳性细菌 (在持续的洪水下) 是主要的Straw-P动员剂.
- 交替湿和干燥显著增强了P的纳入微生物细胞膜的过程,特别是由Actinobacteria和Arbuscular mycorrhiza.
- 根在Fe-P方面超过了微生物,根茎沉积物刺激了微生物活动和P的获取,特别是在土壤干燥期间.
结论:
- 微生物P获取策略与土壤P可用性 (特别是有机P),单酶活性和P源类型密切相关,所有这些都受氧化还原条件的影响.
- 对于优化遗留的P利用和减轻米根和土壤微生物之间的P竞争来说,水制度管理至关重要.
- 针对特定的微生物群体和它们的P获取途径可以增强大米生态系统中的营养循环.
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