赣北植棉区棉花不同播期土壤氮素空间分布特征分析

Analysis on Spatial Distribution Characteristics of Soil Nitrogen at Different Sowing Dates of Cotton in the Cotton Planting Regions of Northern Jiangxi

为了精确了解赣北植棉区长期连作棉田土壤质量情况,为棉田施肥、土壤改良等提供依据。采用空间网格法对长期连作棉田土壤进行取样分析,探究赣北植棉区棉花不同播期的土壤氮素空间分布特征。结果表明,一是土壤氮素水平随土壤深度的增加逐渐减小;二是随着播期的推迟,在横向距离0 cm处氮素含量有降低的趋势,棉行位置氮素含量逐渐升高;三是在同一播期下,棉行处氮素含量与行间处差别不大。赣北植棉区土壤氮素含量随土层深度的增加呈逐渐降低的趋势,与播期大致呈负相关关系,但不同空间区域略有不同。

In order to accurately understand the soil quality of long-term cropping cotton fields in the cotton planting regions of northern Jiangxi,provide a basis for fertilization and soil improvement in cotton fields.The spatial grid method was used to sample and analyze the soil nitrogen distribution in long-term cropping cotton field to explore the spatial distribution characteristics of soil nitrogen in different sowing periods of cotton in the cotton planting regions of northern Jiangxi.The results showed that the soil nitrogen level gradually decreased with the increase of soil depth.Second,with the delay of the sowing date,the nitrogen content at a horizontal distance of 0 cm tended to decrease,and the nitrogen content at the cotton row position gradually increased.Third,under the same sowing date,there is little difference in nitrogen content between rows and rows of cotton.The soil nitrogen content decreased gradually with the increase of soil depth in the cotton planting regions of northern Jiangxi,and was negatively correlated with the delay of sowing date,but it was slightly different in different spatial areas.