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中酸性土壤无机磷形态及生物有效性
引用本文:成瑞喜,贾平.中酸性土壤无机磷形态及生物有效性[J].生态环境,1998(1).
作者姓名:成瑞喜  贾平
作者单位:华中农业大学土化系!武汉,430070
基金项目:美国磷肥基金,世界磷肥研究所资助
摘    要:在黄棕壤和棕红壤上施用磷肥,经三年室内湿润条件下培养,用石灰性土壤无机磷分级方法测定各形态磷含量.各形态用增量的分配比例表明,Fe-P居首位,其次为Al-P和O-P.三级Ca-P之和在20%以下.经培养的土壤种植黑麦草,其生物量和吸磷量与各形态磷量的相关系数除Ca10-P外,均达到极显著水准.土壤有效磷与各形态磷的相关性表明,Ca2-P是土壤有效磷的直接给源(r=0.992),Fe-P、Al-P是有效磷的重要潜在性给源(r分别为0.982和0.914),O-P、Ca10-P为无效态磷(r=-0.168).

关 键 词:中酸性土壤  无机磷形态  生物有效性

Transformation and Bioavailability of phosphorus in Neutral and Acidic Soils
Chen Ruixi and Jia Ping.Transformation and Bioavailability of phosphorus in Neutral and Acidic Soils[J].Ecology and Environmnet,1998(1).
Authors:Chen Ruixi and Jia Ping
Abstract:Soil incubation experiments tvers lasted for 3 years at satured moisture after phosphate fertilizer was applied to yellow brotwn soil and brown red soil. The content of inorganic phosphate species oval also measured with the separation method for lime soil. The results showed that the order of the degree in content increment for various phosphate species with the application of phosphate was Fe-P > Al-P > O-P > Ca-P. The total of three kinds of Ca-P (i.e. Ca2, Ca8 and Ca10) was less than 20% of inorganic phosphorus. The coefficients of correlation between content of available P, biomass of rye, phosphorus uptake and Several P types were 0.9923 for Ca2-P, 0.7822 for Fe-P and 0.9136 for Al-P, separately. There was a distinct relation between these P types and available form. Whereas, the coefficient of correlation between phosphorus uptake and Ca10-P wasn't remarkable. These indicated that Ca2-P was direct available phosphorus and Al-P. Fe-P were indirect one, but Ca10-P was unavailable ror the testing soils.
Keywords:neutral and acidic soil  inorganic phorphorus separation  bioavailability
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