| Study on inorganic phosphorus fractionation on sloping land with different vegetation in the Loess Plateau |
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| DOI：10.7606/j.issn.1000-7601.2008.01.05 |
| Key Words: inorganic phosphorus fractionation distribution typical vegetation loess plateau |
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| Abstract: |
| By inorganic phosphorus fractionation method for calcareous soils?study was made on the forms and compositions of inorganic phosphorus in0～20cm layer of calcareous soil on sloping land with different vegetation in the Loess Plateau．The typical vegetation included bare land?Caragana korshinskii? Solanum tuberosum?Medicago sativ a L．and Ziz iphus jujuba．The results showed that the content of total P in the soil with five kinds of vegetation was high?from0．55to0．85g／kg?but the content of available P was low except Caragana korshinskii （5．920mg／kg） and Medicago sativ a L．（5．332mg／kg）．It was also found that inorganic phosphorus was the main proportion of TP．Among the inorganic phosphorus fractionation?the order of the proportion was Ca2－P＜Al－P＜Fe－P＜Ca8－P＜Ca10－P?and the order of the contents of Ca2－P and Ca8－P of the soil was Caragana korshinskii＞Ziz iphus jujuba＞ Medicago sativ a L．≈Solanum tuberosum．And O－P was not found．We also found that both Ca2－P and Ca8－P had a positive correlation with available P and Ca2－P had a positive correlation with Ca8－P． |