Shallow groundwater table fluctuations promote the accumulation and loss of phosphorus from surface soil to deeper soil in croplands around plateau lakes in Southwest China
文献类型： 外文期刊
作者： Chen, Qingfei 1 ; Li, Wenchao 3 ; Chen, Anqiang 2 ; Min, Jinheng 1 ; Hu, Wanli 2 ; Wang, Chi 2 ; Fu, Bin 2 ; Zhang, Dan 1 ;
作者机构： 1.Yunnan Agr Univ, Coll Resources & Environm, Kunming 650201, Peoples R China
2.Yunnan Acad Agr Sci, Agr Environm & Resources Inst, Kunming 650201, Peoples R China
3.Hebei Agr Univ, Coll Resources & Environm Sci, Hebei Prov Key Lab Farmland Ecoenvironm, Coll Resources & Environm Sci,State Key Lab North, Baoding 071000, Peoples R China
关键词： Shallow groundwater table fluctuation; Soil phosphorus accumulation; Soil phosphorus loss; Cropland; Soil profile
期刊名称：JOURNAL OF ENVIRONMENTAL MANAGEMENT （ 影响因子：8.0； 五年影响因子：7.9 ）
ISSN： 0301-4797
年卷期： 2024 年 366 卷
页码：
收录情况： SCI
摘要： The continuous excessive application of phosphorus (P) fertilizers in intensive agricultural production leads to a large accumulation of P in surface soils, increasing the risk of soil P loss by runoff and leaching. However, there are few studies on the accumulation and loss of P from surface soil to deep soil profiles driven by shallow groundwater table (SGT) fluctuations. This study used the intensive cropland around 7 plateau lakes in Yunnan Province as an example and conducted in situ monitoring of P storage in the soil profile and SGT during the rainy season (RS) and dry season (DS) as well as simulation experiments on soil P loss. The aim was to study the spatiotemporal variation in P accumulation in the soil profile of cropland driven by SGT fluctuations in the RS and DS and estimate the P loss in the soil profile driven by SGT fluctuations. The results showed that fluctuations in the SGT promoted P accumulation from the surface soil to deeper soil. The proportions of P stored in various forms in the 30 -60 cm and 60 -100 cm soil layers in the RS were greater than those in the DS, while the average proportion in the 0 -30 cm soil layer in the DS was as high as 48%. Compared with those in the DS, the maximum decreases in the proportion of P stored as TP and Olsen-P in the 0 -100 cm soil layer in the RS were 16% and 58%, respectively, due to the rise in the SGT (SGT <30 cm), while the soil TP storage decreased by only 1% when the SGT was maintained at 60 -100 cm. The critical thresholds for soil Olsen-P and TP gradually decreased with increasing soil depth, and the risk of P loss in deeper soil increased. The loss of soil P was increased by fluctuations in the SGT. Based on the cropland area around the 7 plateau lakes, P storage, and SGT fluctuations, the average loss intensity and loss amount of TP in the 0 -100 cm soil layer around the 7 plateau lakes were estimated to be 25 kg/ha and 56 t, respectively. Therefore, reducing exogenous P inputs, improving soil endogenous P utilization efficiency and maintaining deep soil P retention are the basic strategies for preventing and controlling P accumulation and loss in deep soil caused by SGT fluctuations.
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