林线附近主要植被类型下土壤非生长季磷素形态
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国家自然科学基金项目(0870396; 40671181; 40971178);国家“十一五”科技支撑计划项目(2006BAC01A00-11; 2006BAC01A00-15);中国科学院知识创新工程“西部行动计划”项目(KZCX2-XB2-02);中国科学院知识创新工程重要方向项目(KSCX2-YW-Z-0959)


The soil phosphorus forms under different vegetation types near timberline during non-growing season
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    摘要:

    采用Hedley磷素分级方法,比较研究了岷江上游林线附近不同植被类型(高寒灌丛草甸、雪山杜鹃灌丛和岷江冷杉林)非生长季0—20cm土壤无机磷和有机磷形态。结果表明,研究区内土壤总磷平均含量(857.32 mg?kg-1)较高,但活性磷含量仅占总磷的10%左右。生物态磷含量占总磷含量的60%以上,表明土壤磷素受生物作用影响较大。3种植被类型下土壤无机磷主要以D.HCl-Pi(稀盐酸提取无机磷)和C.HCl-Pi(浓盐酸提取无机磷)形态存在,活性无机磷和NaOH-Pi含量较少。高寒灌丛草甸土壤D.HCl-Pi和C.HCl-Pi含量均显著高于岷江冷杉,表明其含有更多的钙结合态磷。土壤有机磷与土壤有机碳呈显著正相关,NaOH-Po是有机磷主要的构成形态,占总磷含量的39.39%—53.69%。不同植被类型下土壤有机磷形态间差异较大,岷江冷杉林下土壤NaHCO3-Po和NaOH-Po含量最高,高寒灌丛草甸则含有更多的C.HCl-Po。低温和凋落物积累是造成林线附近土壤有机磷含量较高的重要原因。

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    Phosphorus has generally been assumed to be the limiting or co-limiting factor for plant growth in alpine ecosystems. This study examined the concentration of inorganic and organic phosphorus in surface soils (0—20 cm) under different vegetation types (alpine shrub-meadow, Rhododendron oganniphum and Abies faxoniana) near timberline on upper Min River, using a modified Hedley fraction method. The results showed that the total Phosphorus (TP) in the soil with three vegetation types was on average high (857.32 mg?kg-1). Only about 10% of TP was labile P, however; and organic P comprised over 60% of the TP pool. This suggested that surface soil phosphorus cycling and availability were mainly influenced by biological processes. Most soil inorganic P was found in the forms of D.HCl-Pi and C.HCl-Pi. The soil under different vegetation types had similar amount of labile inorganic phosphorus (labile Pi) and NaOH-Pi, while alpine shrub-meadow had more D.HCl-Pi and C.HCl-Pi than Rhododendron oganniphum and Abies faxoniana, which indicated that the soil under alpine shrub-meadow had more inorganic P combined with calcium. In addition, a significant positive correlation was found between soil organic forms P and the total organic carbon. NaOH-Po was found to be the major form of the soil organic P, ranging from 39.39% to 53.69% of TP. The soil of Abies faxoniana had higher level of NaHCO3-Po and NaOH-Po than alpine shrub-meadow and Rhododendron oganniphum. On the contrary, there was higher C.HCl-Po in alpine shrub-meadow and least in Abies faxoniana. The high level of soil organic P was attributed to low temperature and litters accumulation.

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张林,吴彦,吴宁*,孔璐,刘琳,胡红宇.林线附近主要植被类型下土壤非生长季磷素形态.生态学报,2010,30(13):3457~3464

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