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Relationships of phosphorus fractions to organic carbon content in surface soils in mature subtropical forests, Dinghushan, China

机译：鼎湖山成熟亚热带森林表层土壤磷组分与有机碳含量的关系

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摘要

Exploring the relationship between the accumulation of soil organic carbon (C) and the form and availability of soil phosphorus (P) is important for improved understanding of soil P availability and its regulation of C storage in forest ecosystems. Here, we investigated the relationships among soil organic C, sequentially extracted P fractions and P sorption index in 32 surface soils (0-0.15 m depth) across eight mature subtropical forests (80-400 years) in Dinghushan, China. Results showed that soil organic P (Po) accounted for 40-63% (mean 54%) of soil total P. Soil organic C was significantly positively correlated with both the content and the percentage of soluble inorganic P (Pi), Al-Po and Fe-Po fractions and the content of the Al-Pi fraction. The content of soil total Po increased significantly with soil organic C, whereas the percentage of soil total Po tended to increase with soil organic C only when soil organic C was low (<30 Mg/ha) but was relatively stable when soil organic C was high (>=30 Mg/ha). Moreover, soil organic C was highly correlated with P sorption index. Our results suggest that accumulation of organic C may increase, rather than decrease, the availability of P in surface soil in mature subtropical forests.
机译：探索土壤有机碳（C）的积累与土壤磷（P）的形式和有效性之间的关系，对于增进对土壤磷的有效性及其对森林生态系统中碳储量的调控的理解至关重要。在这里，我们调查了鼎湖山八种成熟的亚热带森林（80-400年）中32种表层土壤（0-0.15 m深度）中土壤有机碳，顺序提取的P含量和P吸附指数之间的关系。结果表明，土壤有机磷（Po）占土壤总磷的40-63％（平均54％）。土壤有机碳与可溶性无机P（Pi），Al-Po的含量和百分比均呈显着正相关。和Fe-Po组分以及Al-Pi组分的含量。土壤总磷的含量随土壤有机碳含量的增加而显着增加，而土壤总磷的百分比仅在土壤有机碳含量低（<30 Mg / ha）时才随着土壤有机碳含量的增加而增加，而当土壤有机碳含量较低时，相对稳定。高（> = 30 Mg / ha）。此外，土壤有机碳与磷的吸附指数高度相关。我们的结果表明，成熟亚热带森林表层土壤中有机碳的积累可能增加而不是减少了磷的有效性。

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