摘要
【目的】探讨武陵山区旱地烟田土壤水分的时空分布特征,为烟田抗旱栽培技术研究提供理论支撑。【方法】2018年5—9月,利用等值线图、时间稳定性分析和相关性分析等方法开展研究。【结果】1)垄体表层土壤水分含量较低,等值线破碎化程度较弱;而底层土壤水分含量较高,等值线破碎化程度较强。与垄体土壤相比,垄沟各层土壤均具有较高的水分含量,等值线也都呈破碎化程度较高的斑块状。2)垄体与垄沟土壤均受到伏旱天气的不利影响,导致土壤水分在7月底(伏旱末期)达到最低值。3)基于时间稳定性指数最小值得出的代表性样点,建立了代表性样点土壤含水量与对应土层平均含水量之间的统计回归模型。4)相关性分析显示,垄体土壤与垄沟土壤之间存在明显的水分交换,且交换量随垄沟土壤深度的增加而增大。【结论】起垄和终生覆膜显著改变了武陵山区旱地烟田土壤水分的时空分布特征,并加剧了伏旱天气下烟田土壤水分的亏缺,研究结果可为本区烟田的墒情预测及抗旱栽培技术研究提供理论支撑。
[Objective]The spatial-temporal distribution characteristics of soil moisture in dry land tobacco fields in the Wuling mountain area are studied,to provide theoretical support for the study of drought resistant cultivation technology in tobacco field in the Wuling mountain area.[Methods]From May to September 2018,contour map,temporal stability analysis and correlation analysis were used to study the spatial-temporal distribution characteristics of soil moisture in dry land tobacco fields in the Wuling mountain area.[Results]1)The content of soil water on the surface of ridge was the lowest,and the fragmentation of contour map was the weakest.However,with the increase of soil depth,the soil moisture content and the fragmentation contour map increased significantly.The water content of each layer of the furrow soil was higher,and the contour map was also a patch with higher degree of fragmentation.2) Both ridge and furrow soils were adversely affected by the summer drought,which led to the lowest soil moisture at the end of July.3) Based on the minimum value of the time stability index,the most time-stable location (MTSL) was obtained,and a regression model between the soil moisture content of the MTSL and the average moisture content of the corresponding soil layer.4) The correlation analysis showed that there was obvious water exchange between ridge soil and furrow soil,and the exchange capacity increased with the increase of the depth of the furrow soil.[Conclusion]Ridge cultivation and plastic mulching significantly changed the spatial-temporal distribution of soil moisture in dryland tobacco fields,and aggravated the soil water deficit in summer drought.The research results can provide theoretical support for the prediction of soil moisture and the drought resistant cultivation in tobacco field.
作者
肖庆礼
孙兰茜
代先强
陈昆燕
杨石猛
汪长国
杨超
戴亚
丁伟
XIAO Qingli;SUN Lanxi;DAI Xianqiang;CHEN Kunyan;YANG Shimeng;WANG Changguo;YANG Chao;DAI Ya;DING Wei(College of Plant Protection,Southwest University,Chongqing 400715,China;China Tobacco Chongqing Industrial Co.,Ltd,Chongqing 400060,China;Chongqing Key Laboratory of Scientific Utilization of Tobacco Resources,Chongqing 400060,China;Chongqing Tobacco Company,Chongqing 400020,China)
出处
《中国烟草学报》
CAS
CSCD
北大核心
2021年第2期35-44,共10页
Acta Tabacaria Sinica
基金
重庆中烟工业有限责任公司博士后立项项目(2018-01)
中国烟草总公司科技重点项目(110201502019)。
关键词
垄作
覆膜
植烟土壤
水分
时空分布
ridge cultivation
plastic mulching
tobacco-planted soil
moisture
spatial-temporal distribution
