黑龙江省西部草地苏打盐渍土无机磷的转化及其对有效磷的影响

本文通过相关分析和通径分析研究了无机磷各组分间的转化关系及其对有效磷的影响 ,结果表明 :苏打碱土的Ca2 -P、Ca8-P、Al-P和Fe -P对有效磷贡献量较大 ,O -P对有效磷表现为负贡献 ,Ca10 -P对有效磷几乎无影响。草甸碱土的Ca2 -P和Fe -P主要通过直接作用影响有效磷 ,Ca8-P和Al -P主要通过间接作用影响有效磷 ;碱化草甸土的Ca2 -P对有效磷的影响主要表现为直接作用 ,Ca8-P、Al-P和Fe -P对有效磷的影响主要表现为间接作用。在苏打盐渍土的磷素循环系统中 ,无机磷各形态间存在一定的转化关系 ,Ca2 -P、Ca8-P和Al-P易于相互转化 ,Fe -P和O -P易于相互转化

Inorganic Soil Phosphorus Transformation and Its Effect on Available Phosphorus in Soda-saline Soil in Grassland of Western Heilongjiang Province

Inorganic soil phosphorus transformation and its effect on available phosphorus were studied by correlation analysis and path analysis. The result showed that, in soda-saline soil, Ca 2-P, Ca 8-P, Al-P and Fe-P all made greater contribution to available phosphorus, but O-P made a negative contribution to available phosphorus, and Ca 10 -P had effect little on available phosphorus. In meadow solonetz, Ca 2-P and Fe-P had greater influence upon available phosphorus in direct way than they did in indirect way, but Ca 8-P and Al-P had greater influence upon available phosphorus in indirect way than they did in direct way. In alkaline meadow soil, Ca 2-P could mainly affect available phosphorus in direct way, but Ca 8-P, Al-P and Fe-P could mainly affect available phosphorus in indirect way. In the system of soil phosphorus cycle in soda-saline soil, there was a mutual transformation relationship between inorganic soil phosphorus forms. Ca 2-P, Ca 8-P and Al-P could easily transformed each other, and the same as Fe-P and O-P.