不同利用方式下石灰性紫色土的锌形态剖面分布特征初探

Profile distribution of zinc forms under calcareous purple soil under different land use.

分析对比了 4个剖面 (稻田、旱地、城墙岩群组林地、蓬莱镇组林地 )Zn形态的分布特征 ,结果表明 ,稻田各形态Zn的剖面分布比旱地复杂 ,农地土层深厚 ,Zn各形态分配在层次间的变化较林地复杂 .DTPA Zn(有效态锌 )在表层分配的相对较高 ,说明作物根系层及林木根系层缺Zn突出 .对各种形态在不同剖面中的分配进行了显著性分析 ,结果表明 ,农地的碳酸盐结合态锌 (3 .65 % )、紧结有机结合态锌(2 .81% )、晶形氧化铁结合态锌 (2 2 .0 4% )显著大于林地 (1.86%、0 .84%、11.5 9% ) .

The distribution of DTPA Zn was influenced by other zinc forms in soil profile. In order to approach the mechanism of zinc deficiency in calcareous purple soil widely distributed in hilly regions of central Sichuan Province,four profiles(paddy field, dry land, K 1c forest land and J 3p forest land) under different land use were selected to study the distribution of other zinc forms. The results indicated that the distribution complication of zinc forms was in order of paddy field>dry land>forest land. The quantities of CAB Zn(3.65%), TOM Zn(2.81%) and COFe Zn(22.04%) in farmland were evidently more than those (1.86%,0.84%,11.59%) in paddy field.