| 土壤养分空间变异及合理取样数研究 |
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| 引用本文： | 薛正平,杨星卫,段项锁,陆贤.土壤养分空间变异及合理取样数研究[J].农业工程学报,2002,18(4):6-9. |
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| 作者姓名： | 薛正平 杨星卫 段项锁 陆贤 |
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| 作者单位： | 上海市气象科学研究所 |
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| 基金项目： | 中国科学院知识创新工程项目－上海精准种植技术集成与示范(K2CX2-412) |
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| 摘 要： | 土壤养分存在明显的空间差异，田间土壤养分合理取样数取决于养分要素自身空间变异程度和人们对数据精度的要求。若空间变异大、精度要求高则需要较多采样数，反之需较少样点数。计算结果表明，极大多数养分要素的合理取样数较实际取样数有较大幅度减少，意味着可大幅降低采样及分析成本。据统计学空间自相关和半方差函数方法研究结果，养分要素存在一定的空间自相关性，但不同方向上的自相关性有明显差异，独立间距也因养分要素而异。研究结果可为精准农业土壤养分样点密度设定、养分要素等值线绘制及精准施肥提供支持。
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| 关 键 词： | 土壤养分 空间变异 自相关 半方差 合理取样数 |
| 文章编号： | 1002-6819(2002)04-0006-04 |
| 收稿时间： | 8/9/2001 12:00:00 AM |
| 修稿时间： | 2001年8月9日 |
Spatial Variability of Soil Nutrient and Reasonable Sampling Number |
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| Xue Zhengping,Yang Xingwei,Duan Xiangsuo and Lu Xian.Spatial Variability of Soil Nutrient and Reasonable Sampling Number[J].Transactions of the Chinese Society of Agricultural Engineering,2002,18(4):6-9. |
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| Authors: | Xue Zhengping Yang Xingwei Duan Xiangsuo and Lu Xian |
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| Abstract: | Soil nutrient distribution has obvious spatial differences. The reasonable sampling number in field for soil nutrient surveying is based on the spatial variability of nutrient factor and the required data precision. The larger the spatial variability is, the more precise the data need to be, then the more sampling number needed. The calculated result indicates that most of the reasonable number of the soil factor can be reduced sharply, which means that a lot of cost of sampling can be saved. According to the result from self-correlation and semi-variance function of geo-statistics method, the self-correlation coefficient values have large difference in various directions, independence interval also changes with soil nutrient factors. As well, the results provide support to decide sampling point density, protracted isoline and fertilize accurately in precision farming. |
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| Keywords: | soil nutrient spatial variability self-correlation semi-variance reasonable number of sampling |
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