日光温室菜园土的磷素形态及吸附和解吸特征

FRACTIONS AND ADSORPTION-DESORPTION CHARACTERISTICS OF P IN SOLAR GREENHOUSE VEGETABLE SOILS

对在斑纹简育湿润淋溶土（潮棕壤）上发育的温室菜园土的磷素含量、磷素的有机和无机组分、磷素的吸附和解吸特征进行了研究，结果表明:日光温室土壤具有明显的磷素积累特征，使用年限在3年～36年日光温室土壤的全磷、速效磷、Cowell全磷和Cowell无机磷含量分别比与其相邻的露地旱田土壤的增加了90.4%～182.4%、505.0%～892.1%、294.5%～478.9%和360.9%～637.6%。其中速效磷含量已达到84.7～138.9mg／kg。日光温室土壤无机磷和有机磷都显著增加，在各组分之间的比例上表现为O-P增加，Ca-P下降，高稳性有机磷相对增加，而活性有机磷所占比例下降。日光温室土壤不仅表现为对磷素的吸附能力增强，而且解吸能力也明显提高。

This paper deals with the amounts of phosphorus, the fractions of inorganic P and organic P, the percentages of fractions and the properties of phosphate adsorption and desorption in vegetable soils (Fim Orthic Anthrosols) under solar greenhouse conditions. The rusults indicated that the enrichment of phousphorus in the soils was rapid under the level of fertilization in Shenyang of Liaoning. The total P, cowell inorganic P,cowell total P and Olsen P increased by 0.904～1. 824. 5. 050～8. 921, 2. 945～4. 789 and 3. 609～6. 376 times, respectively in the soils continuously cutivated for 3～36 years. Among the inorganic P fraction, Ca-P decreased, but Fe-P and O-P increased. The amount of organic P increased greatly in vegetable soils under greenhouse. The percentage of highly resistant organic P in the organic P increased, whereas the labile organic P declined. The amounts of P adsorbed and desorped in the soils under greenhouse condition increased compared with the uncovered soils.