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【目的】研究新疆南疆3县新垦灌耕灰棕漠土不同团聚体无机磷组分分布规律。【方法】采用干筛法来进行土壤团聚体分级,蒋柏藩和顾益初等[1,2]提出的无机磷分级改进法测定不同团聚体中无机磷的组分。【结果】南疆3县新开垦灌耕棕漠土中的无机磷组分随着团聚体大小增大而减少,但无机磷的变化范围因土地利用方式的不同而异。不同团聚体的无机磷组分以Ca10-P为主,占无机磷总量的22%～55%。无机磷组分中含量最低的是Fe-P和Al-P,占无机磷总量的2%～6%。无机磷组分中O-P占总量的9%～30%。有效磷Ca2-P约占无机磷总量的5%。Ca8-P含量为无机磷总量的20%～30%。不同团聚体之间无机磷含量的差异都达到极显著的水平。【结论】在南疆3县新垦灌耕棕漠土不同团聚体中无机磷组分中以Ca10-P为主,占无机磷总量的一半左右,且无机磷组分在不同团聚体中的差异都达到显著或极显著的水平。
【Objective】 The objective of this study was to investigate the distribution of inorganic phosphorus fractions in different aggregates of newly cultivated gray-brown desertified soils in 3 counties in southern Xinjiang. 【Method】 Soil aggregates were classified by dry sieving method. Inorganic phosphorus fractions improved by Jiang Baofan and Gu Yichu et al [1,2] were used to determine the composition of inorganic phosphorus in different aggregates. 【Result】 The contents of inorganic phosphorus in newly cultivated irrigated brown desert soil in 3 counties in Nanjiang decreased with the increase of aggregates size. However, the range of inorganic phosphorus varied with different land use patterns. The content of inorganic phosphorus in different aggregates is Ca10-P, accounting for 22% -55% of the total inorganic phosphorus. The content of inorganic phosphorus is the lowest Fe-P and Al-P, accounting for 2% to 6% of the total inorganic phosphorus. O-P in inorganic phosphorus component accounts for 9% ~ 30% of the total. Available phosphorus Ca2-P accounts for about 5% of the total inorganic phosphorus. Ca8-P content of 20% to 30% of the total inorganic phosphorus. The difference of inorganic phosphorus content between different aggregates reached extremely significant level. 【Conclusion】 Ca 10 -P was the main component of inorganic phosphorus in different aggregates of three kinds of cultivated irrigated brown desert soil in three counties of southern Xinjiang, accounting for about half of the total inorganic phosphorus. Inorganic phosphorus fractions were found in different aggregates The differences have reached significant or highly significant levels.