关键词: 植烟土壤, 有机质, 分布特点, 影响因素

Abstract:

In order to reveal the distribution characteristics of organic matter contents and the influence factors in tobacco planting soil at Longhui area, and improve the fertilization of flue-cured tobacco production, this paper analyzed the distribution characteristics of organic matter contents and the influence factors by traditional statistics, correlation analysis, regression analysis and grey correlation method. The results indicated that ① the organic matter contents in soil of Longhui tobacco growing areas was in the "appropriate" level with 32.22 g/kg mean value, and 51.0％ samples were in the "appropriate" level; ② the contents of organic matter of 4 different agro-type soils were significantly different, and the percent of samples in the "appropriate" level was red soil ＞ limestone soil ＞ yellow soil ＞ paddy soil；③ the organic matter contents of 6 different soil texture were also significantly different, among them the light loam, sandy loam and medium loam had a higher proportion of "appropriate" level than the others; ④ the contents of total nitrogen, available phosphorus and total potassium were high, the content of alkali hydrolyzable nitrogen was in the "appropriate" level, while the contents of total phosphorus and available potassium were low; ⑤ the order of influencing organic matter content distribution was alkali hydrolyzable nitrogen ＞ available potassium ＞ total potassium ＞ total phosphorus ＞ available phosphorus ＞ total nitrogen；⑥ the contents of alkali-hydrolyzable nitrogen, available phosphorus and available potassium had a positive correlation to the organic matter contents, and the contents of total nitrogen, total potassium and total phosphorus had a quadratic curve with organic matter contents in soil.

Key words: tobacco growing soil, organic matter, distribution characteristics, influence factor