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浅地下水平面的波动:加速在耕地土壤中的迁移和转化的一个驱动力

Qingfei Chen¹, Heng Yang², Rongyang Cui³

¹College of Resources and Environment, Yunnan Agricultural University, Kunming, 650201, China; Agricultural Environment and Resources Institute, Yunnan Academy of Agricultural Sciences, Kunming, 650201, China.

|January 30, 2025

概括

浅地下水表 (SGT) 的波动显著增加了耕地土壤中的 (P) 损失,主要是作为溶解的无机P.管理SGT至关重要,以防止加速的P损失和保护水质.

科学领域:

环境科学环境科学
土壤科学土壤科学
农业科学农业科学

背景情况:

在农业土壤中 (P) 的积累和损失是环境的关键问题.
浅地下水平面 (SGT) 的波动经常被忽视为土壤P损失和转变的驱动因素.
在动态的SGT条件下了解P的迁移和转换机制是必不可少的.

研究的目的:

调查土壤P损失的特征和机制,由耕地SGT波动驱动.
在不同的SGT条件下量化P损失,并将其与其他损失途径进行比较.
阐明SGT波动对土壤P形式,微生物活动和P循环的影响.

主要方法:

长期监测埃尔海湖周围的土壤P积累和SGT波动.
一个为期260天的微观实验,模拟SGT波动并测量土壤P损失.
对土壤P含量,形式和微生物功能基因表达的分析.

主要成果:

SGT的波动显著改变了土壤的P含量和物种,溶解的无机P占P损失的75%.
在SGT波动下,与和条件相比,土壤总P (TP) 释放增加了9.5%,TP储存减少了2%.
SGT波动增强了微生物网络的复杂性,刺激了P循环基因,并促进了有机P矿化.
农田的TP损失增加到88.5公斤/公,远远超过了浸和下水的损失.

结论:

SGT波动是农田土壤加速P损失的主要,被低估的途径.
有效的管理策略必须解决SGT动态,以减轻P损失.
建议包括减少外部P输入,增强土壤P储存和利用,以及管理深层土壤P积累.

关键词:

农田是农作物种植的土地.循环是的循环之一.浅层地下水平面的波动.土壤的迁移和转变.土壤特征土壤特征土壤特征

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