Phosphorus Status of a Soil Catena under Liberian Evergreen Rain Forest: Results of31P NMR Spectroscopy and Phosphorus Adsorption Experiments
作者:
Jürgen C. Forster,
Wolfgang Zech,
期刊:
Zeitschrift für Pflanzenernährung und Bodenkunde
(WILEY Available online 1993)
卷期:
Volume 156,
issue 1
页码: 61-66
ISSN:0044-3263
年代: 1993
DOI:10.1002/jpln.19931560110
出版商: WILEY‐VCH Verlag
数据来源: WILEY
摘要:
AbstractPhosphorus NMR spectra were recorded of the A horizons of a soil catena under vital stands of Liberian tropical high forest. Organic P compounds play a major part in the total P reserves (ca. 1/2 of total extractable P which is 1/5 of total soil P). Thereof, between 3.3 and 5.3 kg orthophosphate diester P per hectare participate in the plant available nutrient pool; similar amounts were calculated for the calcium acetate‐lactate soluble fraction. Persistent orthophosphate monoester P makes up an even greater percentage of soil P (10 to 25 kg ha−1). Mineral fertilizer requirements are in the range of 25 to 50 kg per hectare for 10 cm depth (based on a 48 hrs. adsorption experiment) when a soil solution concentration of 0.02 mg L−1is considered adequate for the P supply of plants. P sorption can be explained by the amorphous fractions of Al and Fe hydroxides and the percentage of clay. The apparent vitality and absence of P deficiency symptoms of forest trees suggest the existence of an intact, however delicate, natural P
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