| 王亮,何绍兰,李松伟,姚珍珍,赵旭阳,易时来,郑永强,邓烈.微尺度下丘陵柑橘园碱解氮空间变异性研究[J].中国南方果树,2011,40(3): |
| 微尺度下丘陵柑橘园碱解氮空间变异性研究 |
| Study on Spatial Variability of Soil Available Nitrogen at microscale in hilly Citrus orchard |
| 投稿时间：2011-05-23 修订日期：2011-05-20 |
| DOI： |
| 中文关键词: 空间变异 地统计学 土壤碱解氮 丘陵柑橘园土壤 |
| 英文关键词:spatial variability geostatisties Soil Available Nitrogen hilly Citrus orchard soil |
| 基金项目:农业部引进国际先进农业科学技术计划项目（2006－G29），科技部科技人员服务企业行动项目（2009GJF10004），重庆市农委重庆市柑桔产业重大技术攻关项目（2009-02） |
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| 中文摘要: |
| 我国西南地区的柑橘园多分布于低山丘陵地带，地理和土壤性质差异较大，研究其土壤氮素营养的空间变异特性，可以为实施山地果园土壤养分精准管理和变量施肥提供依据。以重庆忠县拔山镇杨柳村柑橘园区为研究对象，利用地理统计学方法，在微尺度下对其土壤碱解氮含量的空间变异性进行了研究。结果表明：微尺度下，土壤碱解氮含量在采样区内呈比较简单的斑块状分布，相同性质斑块与丘陵缓坡土被连续分布区和小山丘土被不连续分布区范围相当；土壤碱解氮含量在坡体垂直方向的变异性较强，在坡体水平方向上的变异较弱，土壤碱解氮含量的半方差函数曲线的理论模型较好地符合指数模型，在步长间隔15 m下，土壤碱解氮含量具强烈的空间相关性，块金系数达18.2％，空间相关距离达80m，结构性因子是影响其空间变异的主要因素；普通Kriging插值结果表明，研究区土壤碱解氮的空间分布表现为条带状和斑块状分布，高值斑块区的分布与地势相对低洼的地形部位相吻合，地形是影响土壤碱解氮空间变化的主要因素。 |
| 英文摘要: |
| The most of citrus orchards in southwest china are distributed in hilly areas, and the geography and soil properties are quite different. In this study, the spatial variability of Soil Available Nitrogen in the Ba shan Citrus orchards at microscale were analyzed by Geostatistics. The results showed that the soil available nitrogen content showed the region's patchy distribution of relatively simple, and plaque and gentle hills of the same nature is a continuous distribution of soil and small hills of soil is not quite continuous distribution area. Whilst, the soil Available nitrogen content in the slope variation of the vertical direction is strong; the slope variation of the horizontal direction is weak. And the soil nitrogen content of the semi-variance function curve of the theoretical model to better meet the exponential model. The theoretical exponential model was accord with soil available Nitrogen. The soil available Nitrogen with a strong nugget spatial correlation coefficient of 18.2% at 15 m lag interval, and the range of spatially correlation distance for soil available Nitrogen was 80 m, and the structural factors were the main factors that affected the spatial variability. Ordinary Kriging interpolation results showed that the soil nitrogen appeared the spatial distribution of banded and patchy distribution, and the distribution of high-value patch area is consistent with relatively low-lying terrain and topography position, topography affect soil nitrogen Spatial variation of the main factors. Above all, the above results can be provide the basis for the implementation of accurate soil nutrient management and variable rate fertilization in hilly Citrus Orchards。 |
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