Phosphorus Composition and Leaching Characteristics of Sandy Soil Riched by Coastal Shell Debris in Wenchang under Different Land Uses
Soil phosphorus is an essential nutrient for crops,a vital nutrient-limiting factor in agricultural production,and a crucial pollution source for the eutrophication of water bodies.In this study,Wenchang coastal shell debris-rich sandy soil was used as the research object.The inorganic phosphorus classification method proposed by Jiang Baifan and Gu Yichu was ap-plied to study the phosphorus composition.The leaching method was used to evaluate the phosphorus leaching characteristics of the samples.The results revealed that the P in Wenchang coastal shell debris-rich sandy soil was mainly composed of Ca10-P(45.78%),followed by O-P(26.67%)and Ca8-P(11.27%),and the contents of Ca2-P(2.97%),Al-P(4.70%),and Fe-P(8.60%)were relatively low.The contents of Ca2-P(28.35 mg·kg-1)and Ca8-P(93.74 mg·kg-1)in cultivated soil were significantly higher than those in forest soil Ca2-P(3.95 mg·kg-1)and Ca8-P(42.31 mg·kg-1).The contents of Ca2-P and Ca8-P in the soils of melon and leafy vegetable fields were significantly higher than that of other vegetation types of soil.The average phosphorus leaching loss in the soil is 2.92 mg·kg-1,accounting for 0.32%of the total phosphorus content and 10.26%of the available phosphorus(Olsen-P)content in the soil.The Olsen-P leaching threshold is 51.13 mg·kg-1.
coastal shell debris-rich sandy soilphosphorusmorphological compositionleaching threshold value
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