基于养分丰缺分级的蔗田土壤肥力主成分综合分析

Comprehensive Analysis of Main Components of Soil Fertility of Sugarcane Field Based on Soil Nutrient Grades

采集22个代表区域的206份蔗田土样,结合土壤养分丰缺分级,采用主成分综合评价分析了12个土壤养分指标。结果表明,土壤p H总体较低;超过一半的地块有机质、全氮、全磷、全钾、碱解氮和速效钾处在低级至甚缺水平;部分地块铁、锰含量较高,铁不缺,铜、锰、锌普遍缺乏。主成分分析表明,在主成分1上,p H、有机质、全氮、碱解氮、全磷、有效磷、全钾以及有效锰,有效锌、有效铜、有效铁起主要作用;在主成分2上,有效钾、有效铁、有效铜、有效锌、有效锰起主要作用;在主成分3上,有效磷、全磷、有效锰起主要作用;在主成分4上,有机质、全磷、有效磷、有效钾和有效铁起主要作用;在主成分5上,有机质、全钾、速效钾、有效锰起主要作用。22个研究区域的土壤肥力划分为5类,其中肥力水平较低的3类和4类居多,总体肥力水平偏低。

206 soil samples from sugarcane field in 22 representative study areas were comprehensively valued by principal component analysis, according to the principle of soil nutrient grades. The results showed that the soil pH of the survey region was at a lower level. More than half of the soil samples were low on organic matter, total nitrogen, total phosphorus, total potassium, available nitrogen and available potassium, while some regions were lack of copper and zinc, hut iron and manganese increased. Principal component analysis indicated that in the first component, pH, organic matter, total nitrogen, alkaline hydrolytic nitrogen, total phosphorus, available phosphorus, total potassium, available manganese, available zinc, and available copper and available iron played a major role. In the second component, available potassium, available iron, available copper, available zinc and available manganese played a leading role. In the third main component, available phosphorus, total phosphorus and available manganese played a major role. In the fourth main component, organic matter, total phosphorus, available phosphorus, available potassium and available iron played a major role. In the fifth main component, organic matter, total potassi- um, available potassium, availabla manganese played a major role. Soil fertility of the 22 survey region in this paper was divided into five grades, with the majority of the third grade and fourth grade which were at a low lever. So the soil fertility in the 22 survey region was poor.