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Shallow groundwater table fluctuations: A driving force for accelerating the migration and transformation of phosphorus in cropland soil
Water Research ( IF 11.4 ) Pub Date : 2025-01-27 , DOI: 10.1016/j.watres.2025.123209
Qingfei Chen, Heng Yang, Rongyang Cui, Wanli Hu, Chi Wang, Anqiang Chen, Dan Zhang
Water Research ( IF 11.4 ) Pub Date : 2025-01-27 , DOI: 10.1016/j.watres.2025.123209
Qingfei Chen, Heng Yang, Rongyang Cui, Wanli Hu, Chi Wang, Anqiang Chen, Dan Zhang
The accumulation of phosphorus (P) in soil profiles of intensive cropland and the losses caused by runoff and leaching have been widely concerned. However, the loss of soil P due to shallow groundwater table (SGT) fluctuations driven by seasonal changes is often neglected, and the migration and transformation mechanisms of soil P are still unclear. On the basis of the long-term monitoring of cropland soil P accumulation and SGT fluctuations around Erhai Lake, the characteristics of soil P loss driven by SGT fluctuations and the corresponding mechanisms were investigated through a 260-day microcosm experiment. The results revealed that the fluctuations in SGT significantly changed the content and form of P in the soil profile. The soil P loss mainly occurred in dissolved form, mainly involving inorganic P, accounting for 75 %. Compared with those under continuous saturated conditions, soil total P (TP) release during SGT fluctuations significantly increased by 9.5 %, and soil TP storage was reduced by 2 %. SGT fluctuations increased the complexity of microbial networks in the soil profile, stimulated the expression of functional genes for soil P cycling, and promoted soil organic P mineralization. The SGT fluctuations caused an increase in the soil TP loss from cropland to 88.5 kg/ha, which was 70 and 25 times greater than that via leaching and runoff, respectively. These results indicated that SGT fluctuations accelerated the P loss from soil profile of cropland. Therefore, some measures should be comprehensively applied to prevent its loss, such as reducing external P input, improving surface soil P storage capacity and soil P utilization efficiency, reducing surface P leaching into deep soil, and reducing P accumulation in deep soil profiles.
中文翻译:
浅层地下水位波动:加速农田土壤磷迁移转化的驱动力
集约化农田土壤剖面中磷 (P) 的积累以及径流和淋失造成的损失受到广泛关注。然而,季节变化驱动浅层地下水位 (SGT) 波动导致土壤 P 的损失往往被忽视,土壤 P 的迁移和转化机制仍不清楚。在对洱海湖周围农田土壤磷素积累和土壤磷素波动进行长期监测的基础上,通过260 d的微观实验,研究了土壤磷素流失由土壤磷素波动驱动的土壤磷素流失特征及其机制。结果表明,SGT 的波动显著改变了土壤剖面中 P 的含量和形态。土壤磷损失主要以溶解形式发生,主要涉及无机磷,占 75 %。与连续饱和条件下相比,SGT 波动期间土壤全磷 (TP) 释放量显著增加 9.5 %,土壤 TP 储量减少 2 %。SGT 波动增加了土壤剖面中微生物网络的复杂性,刺激了土壤 P 循环功能基因的表达,促进了土壤有机 P 矿化。SGT 波动导致农田土壤 TP 损失增加到 88.5 kg/hm2,分别是淋失和径流损失的 70 倍和 25 倍。这些结果表明,SGT 波动加速了农田土壤剖面 P 的损失。因此,应综合采取一些措施来防止其流失,如减少外部磷输入,提高表层土壤磷储量和土壤磷利用效率,减少表层磷向深部土壤中淋失,减少深部土壤剖面磷积累。
更新日期:2025-01-30
中文翻译:
浅层地下水位波动:加速农田土壤磷迁移转化的驱动力
集约化农田土壤剖面中磷 (P) 的积累以及径流和淋失造成的损失受到广泛关注。然而,季节变化驱动浅层地下水位 (SGT) 波动导致土壤 P 的损失往往被忽视,土壤 P 的迁移和转化机制仍不清楚。在对洱海湖周围农田土壤磷素积累和土壤磷素波动进行长期监测的基础上,通过260 d的微观实验,研究了土壤磷素流失由土壤磷素波动驱动的土壤磷素流失特征及其机制。结果表明,SGT 的波动显著改变了土壤剖面中 P 的含量和形态。土壤磷损失主要以溶解形式发生,主要涉及无机磷,占 75 %。与连续饱和条件下相比,SGT 波动期间土壤全磷 (TP) 释放量显著增加 9.5 %,土壤 TP 储量减少 2 %。SGT 波动增加了土壤剖面中微生物网络的复杂性,刺激了土壤 P 循环功能基因的表达,促进了土壤有机 P 矿化。SGT 波动导致农田土壤 TP 损失增加到 88.5 kg/hm2,分别是淋失和径流损失的 70 倍和 25 倍。这些结果表明,SGT 波动加速了农田土壤剖面 P 的损失。因此,应综合采取一些措施来防止其流失,如减少外部磷输入,提高表层土壤磷储量和土壤磷利用效率,减少表层磷向深部土壤中淋失,减少深部土壤剖面磷积累。