长沙市蔬菜地土壤有效养分的空间变异性分析  

Spatial Variability of Available Nutrients in a Vegetable Soil in Changsha

作　　者：刘新亮[1,2] 秦红灵[2] 魏文学[2] 吴金水[2] 王翠红[1] 李勇[2] 

机构地区：[1]湖南农业大学,湖南长沙410125 [2]中国科学院亚热带农业生态研究所,湖南长沙410125

出　　处：《土壤通报》2011年第4期833-840,共8页Chinese Journal of Soil Science

基　　金：国家科技支撑计划(2008BADA7B07;2008BADA7B01);长沙市科技计划(K0902166-21)

摘　　要：在长沙市宁乡超大蔬菜基地,以面积为239.5 hm2的蔬菜地为试验区,随机采集了329个土壤耕层（0-20 cm）样品,应用地统计学分析了土壤铵态氮、硝态氮、有效磷的空间变异特征,并应用克里格插值方法绘制了土壤三种有效养分的空间分布图。为了使数据更好地符合正态分布,我们对它们进行了logit转化。通过趋势分析,我们发现铵态氮不存在明显的空间趋势,硝态氮和有效磷存在二阶空间趋势。地统计分析结果表明,数据经logit转化和必要的趋势去除后,铵态氮和硝态氮表现为中等空间自相关性,有效磷表现出较强的空间自相关性。铵态氮的半方差函数图符合Matérn模型,硝态氮和有效磷的半方差函数图符合Stein的Matérn模型。它们的变程分别为144 m、592 m、168 m。研究区铵态氮空间分布破碎化程度较高,硝态氮和有效磷的空间分布具有明显的阶梯状趋势。The geostatistical method was applied to analyze and to map the spatial variability of soil ammonium-nitrogen（NH4＋-N）,nitrate-nitrogen（NO3——N） and available phosphorous（A-P） contents of topsoil（0-20 cm） at a 239.5 hm2 experimental site in the Ningxiang vegetable base in Changsha.There were 329 soil samples randomly collected over the study area.The logit transformation was selected to transform three soil variables in order to obtain better normal distribution.The tendency analysis demonstrated that NH4＋-N had no significant spatial trend,whilst NO3——N and available P exhibited the second-order trends.The results of geostatistical analysis indicated that the spatial autocorrelation of NH4＋-N and NO3——N lay moderate,whilst available P were strong.The Matérn theoretical model was best-fitted for the semivariogram of the logit-tansformed NH4＋-N,and the Stein＇s Matérn model for both logit-tansformed NO3——N and available P when their second-order spatial trends were removed.The spatial ranges for three soil variables were 144 m,592 m and 168 m,respectively.The spatial distribution maps of three soil available nutrients interpolated by the kriging interpolation demonstrated that NH4＋-N exhibited a high degree of fragmentation,whilst NO3——N and available P were characterized by a gradual changing trend.

关 键 词：地统计学 蔬菜地 有效养分 空间变异 

分 类 号：S131[农业科学—农业基础科学] S158.3