| 江西省耕地土壤氮素空间变异特征及其影响因素 |
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| 引用本文： | 江叶枫,饶磊,郭熙,叶英聪,孙凯. 江西省耕地土壤氮素空间变异特征及其影响因素[J]. 长江流域资源与环境, 2018, 27(1): 46-79. DOI: 10.11870/cjlyzyyhj201801009 |
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| 作者姓名： | 江叶枫 饶磊 郭熙 叶英聪 孙凯 |
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| 作者单位： | （1.江西农业大学江西省鄱阳湖流域农业资源与生态重点实验室/国土资源与环境学院, 江西 南昌 330045；2.南方粮油作物协同创新中心，湖南 长沙 410000）; |
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| 基金项目： | 国家自然科学基金，江西省自然科学基金，江西省赣鄱英才“555”领军人才项目 |
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| 摘 要： | 为定量探讨省域尺度下土壤氮素空间变异特征及其影响因素。以江西省2012年测土配方施肥项目采集的16 582个耕地表层(0~20 cm)土壤样点数据，运用普通克里格、单因素方差分析与回归分析方法，对土壤氮素空间变异特征及其影响因素进行分析。结果表明：（1）江西省土壤全氮(TN)含量在026~375 g/kg之间，平均值为158 g/kg，变异系数为3101%；碱解氮(AN)含量值域范围为1160~39970 mg/kg，平均值为16431 mg/kg，变异系数为3460%；二者均呈中等程度的变异性。（2）经半方差分析，TN与AN的变程分别为31489和3030 km，TN的空间自相关范围大而AN较小。（3）在空间分布上，高值区主要分布在新余市、抚州市与景德镇市。（4）回归分析与单因素方差分析结果表明，地形因子、耕地利用方式、成土母质、土壤类型和秸秆还田方式对土壤氮素空间变异影响极显著(P<001)。秸秆还田方式对土壤TN与AN空间变异的独立解释能力最高，分别为271%与42%，是影响江西土壤氮素空间变异的主要因素。
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| 关 键 词： | 定量 江西省 土壤氮素 空间变异 影响因素 quantitative Jiangxi province soil nitrogen spatial variability influencing factors |
Spatial Variability of Farmland Soil Nitrogen of Jiangxi Province and Its Influencing Factors |
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| JIANG Ye-feng,RAO Lei,GUO Xi,YE Ying-cong,SUN Kai. Spatial Variability of Farmland Soil Nitrogen of Jiangxi Province and Its Influencing Factors[J]. Resources and Environment in the Yangtza Basin, 2018, 27(1): 46-79. DOI: 10.11870/cjlyzyyhj201801009 |
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| Authors: | JIANG Ye-feng RAO Lei GUO Xi YE Ying-cong SUN Kai |
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| Affiliation: | (1.Jiangxi Agricultural University, Key laboratory of Poyang Lake Watershed Agricultural Resources and Ecology of Jiangxi Province/Academy of Land Resource and Environment, Nanchang 330045, China；2. Southern Regional Collaborative Innovation Center for Grain and Oil Crops in China, Changsha 410000, China); |
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| Abstract: | In order to quantitatively measure the soil nitrogen spatial characteristics of the Jiangxi province,16582 points data collected from the project of 2012 soil-test-based formulated fertilization were analyzed in this study.The analysis methods included ordinary kriging,one-way variance analysis and regression analysis.The results showed:①Total nitrogen (TN) ranged from 0.26 g/kg to 3.75 g/kg,with an average of 1.58 g/kg.The coefficient of variation was 31.01％,indicating a moderately spatial variability.Available nitrogen (AN) ranged from 11.60 mg/kg to 399.70 mg/kg,with an average of 164.31 mg/kg.The coefficient of variation was 34.60％,showing a moderately spatial variability.②The spatial changes of TN and AN were 314.89 km and 30.30 km,respectively;the spatial autocorrelation range of TN is larger and AN is smaller.③In the spatial distribution,the high value areas were mainly included the city of Xinyu,Fuzhou and Jingdezhen.④The terrain factors,farmland-use type,parent material,soil type and straw returning patterns had significant impacts on the spatial variability of soil nitrogen (P ＜ O.O1).Straw returning patterns was the most important factor that influencing on soil nitrogen spatial variation of the Jiangxi province,which could explain 27.1％ of TN spatial variability and 4.2％ of AN spatial variability. |
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