摘要
我国西南地区的柑桔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桔园为研究对象,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0.182,空间相关距离达80 m,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。
Most of the citrus orchards in southwest china are located in hilly areas with quite different geographical and soil characters that influence the spatial distribution of soil nitrogen, and the study on changes in soil nitrogen distribution patterns Will provide valuable information for precision management of soil nutrients and fertilizer application in mountain orchards. The spatial variations of soil alkali-hydrolyzable nitrogen in citrus orchards of Bashan town, zhongxian county of Chongqing were analyzed at microscale by Geostatistics. The results showed that the soil alkali-hydrolyzable nitrogen content showed a relatively simple patchy distribution. The patches and gentle hills of the same nature were continuous while small hills was discontinuous in soil nitrogen distribution. Strong variability in soil alkali-hydrolyzable nitrogen content was observed in the vertical direction of the slope while the variability in horizontal direction was weak. The theoretical model of the semivariogram curve of the soil alkali-hydrolyzable nitrogen distribution was in good agreement with the exponential model. According to the model, the soil alkali-hydrolyzable nitrogen content was strongly depended on spatial locations when choosing a lag interval of 15 m, yielding a nugget coefficient of 0. 182, and a spatially correlated distance of 80 m, and the structural factors were the main factors that affected the spatial variations. Ordinary Kriging interpolation results showed that the spatial distribution of alkali-hydrolyzable nitrogen appeared banded and patchy, and the distribution of high-value patch areas was consistent with relatively low-lying terrains. Topography was the key factor affecting the spatial variations of soil alkali-hydrolyzable nitrogen.
出处
《中国南方果树》
北大核心
2011年第3期15-19,共5页
South China Fruits
基金
农业部柑桔加工关键技术--良种引进与示范项目(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)资助
关键词
空间变异
地统计学
土壤碱解氮
丘陵柑桔园土壤
spatial variability
geostatisties
soil alkali-hydrolyzable nitrogen
hilly citrus orchard soil
