RHIZOSPHERE PHOSPHATASE-ACTIVITY AND PHOSPHATASE HYDROLYZABLE ORGANIC PHOSPHORUS IN 2 FORESTED SPODOSOLS

被引：73

作者：

FOX, TR ^{[1
]}

COMERFORD, NB ^{[1
]}

机构：

[1] UNIV FLORIDA,DEPT SOIL SCI,GAINESVILLE,FL 32611

来源：

SOIL BIOLOGY & BIOCHEMISTRY | 1992年 / 24卷 / 06期

关键词：

D O I：

10.1016/0038-0717(92)90083-A

中图分类号：

S15 [土壤学];

学科分类号：

0903 [农业资源与环境]; 090301 [土壤学];

摘要：

The cycling of organic phosphorus has a large effect on P availability in forest ecosystems. Organic P must be hydrolyzed to inorganic P before it can be utilized by plants. We examined the acid phosphatase activity in the rhizosphere of slash pine (Pinus elliottii) growing in A and Bh horizon soil from two forested Spodosols; and determined the amount of soluble organic P in these soils that could be hydrolyzed following the addition of an acid phosphomonoesterase. Significant acid phosphatase activity was observed in the A and Bh horizons of the two soils. Acid phosphatase activity was greater in the rhizosphere of the Leon A and Bh horizons and the Pomona Bh horizon soil. Phosphorus fertilization decreased the phosphatase activity in the rhizosphere soil. Soluble organic P comprised 15-25% of the total soluble P in the two A horizon soils and over 75% in the Bh horizon soils. Between 20 and 30% of the water-soluble organic P in the A and Bh horizons of the two soils was hydrolyzed when an acid phosphomonoesterase was added. Our results suggest that organic P may contribute to the P nutrition of slash pine growing on these soils.

引用

页码：579 / 583

页数：5

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