馬琳 向德明 田明慧 田茂成 張黎明 李強



摘要 基于2000和2015年湘西植煙土壤交換性鎂數(shù)據(jù),分析其基本統(tǒng)計特征和時空分布變化。結果表明,從基本統(tǒng)計特征看,15年間湘西植煙土壤交換性鎂均值由1.39 cmol/kg上升到1.77 cmol/kg,同時其變異程度也增大。從時空變異看,15年來,植煙土壤交換性鎂“低”和“極地”等級面積增加了4.62百分點和1.18百分點,“高”和“極高”等級面積增加了9.13百分點 和9.80百分點,而“適宜”等級的面積下降了2473百分點。總體上,湘西植煙土壤交換性鎂呈增加和兩極分化的趨勢。
關鍵詞 湘西;植煙土壤;交換性鎂;時空變異
中圖分類號 S572文獻標識碼 A
文章編號 0517-6611(2019)11-0150-03
doi:10.3969/j.issn.0517-6611.2019.11.043
開放科學(資源服務)標識碼(OSID):
(1.Hunan Provincial Tobacco Company Xiangxi Branch, Jishou, Hunan 416000;2. Institute of Tobacco, College of Agronomy, Hunan Agricultural University,? Changsha,Hunan 410128)
Key words Based on the data of exchange magnesium in tobacco planting soil in Xiangxi in 2000 and 2015, the basic statistical characteristics and spatial and temporal distribution changes were analyzed. The results showed that the mean of exchange magnesium in tobacco planting soil in Xiangxi increased from 1.39 cmol/kg to 1.77 cmol/kg in 15 years, and the degree of variation increased. In terms of spatial and temporal variations, over the past 15 years, the "low" and "polar" grade areas of flueplanting soil have increased by 4.62 percentage point and 1.18 percentage point, and the "high" and "very high" grade areas have increased by 9.13 percentage point and 9.80 percentage point, the area of the "suitable" level decreased by 24.73 percentage point. Overall, the trend of increasing and polarization of exchangeable magnesium in tobacco planting soil in Xiangxi.
Abstract Xiangxi;Tobacco planting soil;Exchangeable magnesium;Spatiotemporal variability
基金項目 湖南省煙草公司項目(XX16-18Aa02)。
作者簡介 馬琳(1972—),男, 湖南隆回人,經濟師,在讀碩士,從事煙草經濟研究。
*通信作者,副教授,博士,從事煙草科學與工程技術和農業(yè)可持續(xù)發(fā)展研究。
收稿日期 2018-12-19
鎂的最主要功能是作為葉綠素的中心原子,位于葉綠素分子結構卟啉環(huán)的中間,是葉綠素中唯一的金屬原子;鎂是酶的強激活劑,煙草中參與光合作用、糖酵解、三羧酸循環(huán)、呼吸作用、能量轉移和硫酸鹽還原等過程的酶均依靠鎂來激活;缺鎂會影響煙草發(fā)育,造成煙草產量和品質嚴重降低,但鎂含量過多時,根發(fā)育受阻,莖中木質部組織不發(fā)達,葉綠組織細胞增大但數(shù)量減少[1]。就煙葉品質而言,缺鎂時,煙葉的灰分含量增加,煙葉淀粉貯備降低。適量的鎂對保持煙葉的燃燒性十分重要,但鎂過量也同樣會降低煙葉燃燒性。……