水土保持学报2018，Vol.32Issue(2)：237-245,9.DOI:10.13870/j.cnki.stbcxb.2018.02.035
基于地区和土类的吉林省农田耕层土壤氮素时空变化特征
Temporal and Spatial Variability of Nitrogen Status in Cropland Topsoil in Jilin Province Based on Regions and Soil Types
摘要
Abstract
The temporal and spatial variability of topsoil nitrogen (N) status across the different regions and soil types in Jilin province was evaluated by using traditional statistic method combines with GIS technique,based on the data of topsoil total N and alkali-hydrolyzable N in soil testing and recommended fertilization program during 2005-2013.Moreover,the historic changing trend of topsoil N status was also discussed by compared with the data obtained during the second national soil survey.Results showed that the total N content in topsoil ranged between 0.4 and 3.9 g/kg with a mean of(1.62±0.60)g/kg,and the alkalihydrolyzable N content ranged between 15 and 360 mg/kg with a mean of(145.0±59.5)mg/kg in the present Jilin province.The total N and alkali-hydrolyzable N contents in topsoil showed same oeders among the various soil types,these were highest in dark brown soil with the values of(2.02±0.57)g/kg and(190.2± 72.8)mg/kg,and followed by albic soil,paddy soil,black soil,meadow soil,chernozem,and aeolian sandy soil.In view of the province as a whole,the spatial distribution of N status in topsoil was characterized by being high in the east and low in the west,and a positive and significant correlation was shown between the total N content and the alkali-hydrolyzable N content in the county scale.Compared with the second soil survey,the total N and the alkali-hydrolyzable N contents in topsoil showed obviously ascending trends in the scale of whole Jilin province,the change magnitude of topsoil N status were mostly significant in the central region but relatively low in the west region.The great discrepancies were also observed in the change trends of topsoil N status among various soil types.Of which,black soil,chernozem,meadow soil,and aeolian sandy soil showed increasing trends,while dark brown soil,albic soil,and paddy soil showed decreasing trends.Compared with other soil types,the increasing magnitude was significant in aeolian sandy soil,and the decreasing magnitude was significant in dark brown soil.In conclusion,there were enormous differences in spatial distribution and historic change in the N status of cropland topsoil in Jilin province.Based on the temporal and spatial characteristics of topsoil N status between regions and soil types,we suggested that N fertilizer rate in crop production should be strictly controlled in the major grain producing areas of the central region to improve N use efficiency and reduce environmental risk,and crop N fertilizer management should be improved according to local conditions in the east and west regions to enhance soil fertility and to achieve high yield and high efficiency.关键词
吉林省/农田耕层土壤/土壤氮素/土类/时空变异Key words
Jilin province/cropland topsoil/soil nitrogen/soil type/temporal and spatial variability分类
农业科技引用本文复制引用
陈敏旺,王缘怡,陈健,王寅,高强,焉莉,冯国忠..基于地区和土类的吉林省农田耕层土壤氮素时空变化特征[J].水土保持学报,2018,32(2):237-245,9.基金项目
国家重点研发计划项目(2016YFD0200101) （2016YFD0200101）
国家现代农业玉米产业技术体系项目(CARS-02) （CARS-02）
