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对滨海脱盐土壤或轻度盐渍土壤上不同林龄I -69杨根际、非根际无机磷存在形态、数量和有效性进行了研究 ,结果表明 :I -69杨根系活动能明显提高根际土壤供磷能力 ,3、5、11年生I -69杨根际有效磷明显富集 ,富集量分别为3 .87、4.3 2、4.3 5mg/kg ;Ca2 -P在不同林龄I -69杨根际含量明显高于非根际土 ,差异都达到极显著水平 ,R/S随林龄增大分别是 2 .15、2 .5 9、5 .5 4;Ca8-P在 5、11年生I -69杨根际明显富集 ,而Ca10 -P明显亏缺 ;不同林龄I -69杨根际、非根际土Al-P、Fe -P和O -P含量无明显差异 ,盐渍土壤中它们的生物有效性较低。
The morphology, quantity and availability of inorganic phosphorus in rhizosphere and non-rhizosphere of I -69 poplar in coastal desalination or mild saline soils were studied. The results showed that the activity of I -69 Yang root could significantly increase rhizosphere soil Phosphorus ability of rhizosphere soil was significantly enriched in rhizosphere of I -69 poplar aged 3, 5 and 11 years, and their enrichment was 3.87,4.3 and 2,4.3 5 mg / kg, respectively. The content of Ca2-P in rhizosphere of I -69 poplar was obviously different Higher than the non-rhizosphere soil, the differences reached the extremely significant level, R / S increased with age was 2.15,2.55,55.4; Ca8-P in 5,11 years of I -69 Yang rhizosphere While Ca10-P was obviously deficient. There was no significant difference in the content of Al-P, Fe-P and O-P in I -69 poplar and non-rhizosphere soil under different ages, and their bioavailability low.