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.