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本文采用ArcGIS、地统计学及统计分析方法,研究了沱江中游耕层(0～20 cm)321个土样的土壤有效铁含量的空间分布特征及其影响因素。结果表明,沱江中游土壤有效铁含量平均为(20.71±26.17)mg.kg-1,达到一级,其含量属于丰富。土壤有效铁含量整体主要呈条带状分布,局部出现斑点、块状区域,高值区分布在西北部的清江镇附近,低值区分布在西南部的五凤镇和东南部的金龙镇附近。影响因素分析表明,土壤有效铁含量与pH呈极显著负相关,与有机质含量呈极显著正相关。土地利用方式和土壤质地发生改变时,土壤有效铁含量随之改变,中壤土与灌溉水田中有效铁含量最高,而砂壤土与有林地中最低。随着坡度的升高,土壤有效铁含量呈降低的趋势。
In this paper, ArcGIS, geostatistics and statistical analysis methods were used to study the spatial distribution characteristics of available soil iron and its influencing factors on 321 soil samples from the top of the Tuojiang River (0 ~ 20 cm). The results showed that the average available iron content in the middle reaches of Tuojiang River was (20.71 ± 26.17) mg.kg-1, reaching the first level, and its content was rich. The available iron content in soil is mainly in the form of banded distribution, local spot and block area are located in the vicinity of Qingjiang Town in the northwest, while the low value areas are located in Wufeng Town in the southwest and Jinlong Town in the southeast . The analysis of influencing factors showed that soil available iron content had a significant negative correlation with pH, and had a significant positive correlation with organic matter content. When the land use pattern and soil texture changed, the effective iron content in the soil changed, the available iron content was the highest in middle loam soil and irrigated paddy soil, and the lowest in sandy loam soil and wooded land. With the increase of slope, the effective iron content of soil tends to decrease.