【作者】 刘敏；

【导师】 邓小华； 卢胜进；

【作者基本信息】 湖南农业大学 ， 作物（专业学位）， 2015， 硕士

【摘要】 永顺县是湖南省的主要植烟区之一。为明确永顺烟区植烟土壤中钙、镁、硫元素的含量状况,研究了永顺烟区植烟土壤的钙、镁、硫元素发布及其影响因素,以期为永顺烟区植烟土壤钙、镁、硫元素诊断和施肥提供参考。主要研究结论如下：1.永顺县植烟土壤交换性钙含量总体偏高。交换性钙含量平均1561.73 mg.kg^-1。交换性钙含量适宜的土样仅占22.45%,偏高的占53.06%；另外有23.81%的土壤存在着不同程度的缺钙,极度缺乏的样品出现在毛坝乡,交换性钙含量为193.90 mg.kg^-1,需补充含钙的肥料。2.永顺县植烟土壤有效硫含量丰富。有效硫含量平均为50.88 mg.kg^-1。有效硫含量中等水平以上的土样占86.90%,含量缺乏的土样仅占10.34%；有效硫含量偏低的土壤主要为高坪乡和石堤乡,这些乡镇土壤建议适当施用含硫肥料。3.永顺县植烟土壤交换性镁含量适宜。交换性镁平均含量为178.26 mg.kg^-1。交换性镁含量达中等以上的土样占70.75%,缺乏的土样占29.25%,极缺乏的土样占4.76%。植烟土壤中交换性镁含量分布不平衡,空间变异较大。全县西南部和中部交换性镁含量丰富,北部和南部成缺乏和极缺乏状态。4.采用分组方法分析了土壤pH、土壤类型、有机质与钙、镁、硫元素含量的关系。交换性钙和交换性镁的含量都随着pH的升高而升高的趋势；石灰土的平均含钙量最高,水稻土的交换性钙含量仅次于石灰土；交换性钙、镁含量有随着有机质的升高含量升高的趋势,植烟土壤有效硫含量有随有机质的升高而降低的趋势。更多还原

【Abstract】 Yongshun is one of the main tobacco-growing area of Hunan Province. In order to further determine the secondary element nutrient supply situation in the soil of yongshun tobacco production, This study analyzed the content of secondary element and its influencing factors in the current level of the tobacco production, according to provide the reference to the fertilization and the secondary element diagnostic of the yongshun tobacco production, then we get the following conclusion:1.Exchangeable calcium content is generally on the high side. Average exchangeable calcium content is 1561.73 mg.kg^-1.Appropriate exchangeable calcium content accounted for only 22.45% of all soil samples, high commutativity calcium content accounted for 53.06%; Another 23.81% of the soil samples there are different levels of acalcerosis. Extreme acalcerosis sample is in MaoBa Town, exchangeable calcium content is 193.90 mg.kg^-1, this town needs to supplement calcium fertilizer.2.Available sulfur content of the tobacco production is very rich, average available sulfur content is 50.88 mg.kg^-1. Available sulfur content medium level soil sample accounted for 86.90% of all soil samples, the content of available sulfur soil samples which is acalcerosis accounted for only 10.34%,The town which the soil effective sulfur content is low, mainly focus on Gaoping township and Shidi township, It is recommended to use sulfur Fertilizer in these township.3.Exchangeable magnesium content of the tobacco production is appropriate. Average exchangeable magnesium content is 178.26 mg.kg^-1. Medium level of the exchangeable magnesium soil samples accounted for 70.75% of all soil samples, Another 29.25% of the soil samples are magnesium deficiency, and exchangeable magnesium content which is extreme lack of accounted for 4.76% of all soil samples. From the point of exchangeable magnesium space distribution, the overall level of the exchangeable magnesium content in the main tobacco-growing area of this county is rich, but uneven distribution, and spatial difference is large. Exchangeable magnesium content in the county of the southwest and central region is rich, and the north and south of the county extremely Magnesium deficiency.4.The change area scope of pH in the tobacco-growing area of Yongshun is pH4.21-pH6.81.The author used multiple comparison method to compare correlation of pH and the three secondary element nutrients found that exchangeable calcium and effective magnesium present a sharply rising trend with the increase of pH; The content of the Exchangeable Calcium is in the highest average of each soil type, and the content of Exchangeable Calcium of paddy soil is next only to limestone soil; We also found that exchangeable Calcium and Magnesium content increased with increase in organic matter content of the soil available sulfur content and trend,the Smoke is decreased with the trend of organic matter.更多还原