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江西省耕地土壤氮素空间变异特征及其影响因素
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
作者姓名:江叶枫  饶磊  郭熙  叶英聪  孙凯
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);
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
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026~375 g/kg之间,平均值为158 g/kg,变异系数为3101%;碱解氮(AN)含量值域范围为1160~39970 mg/kg,平均值为16431 mg/kg,变异系数为3460%;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31489和3030 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<001)。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271%与42%,是影响江西土壤氮素空间变异的主要因素。

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
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
Authors:JIANG Ye-feng  RAO Lei  GUO Xi  YE Ying-cong  SUN Kai
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);
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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