| 郭天文,赖丽芳,胡志桥,杨文玉.甘肃省河西走廊中部新垦荒地土壤养分空间变异特征[J].干旱地区农业研究,2007,(4):151~156 |
| 甘肃省河西走廊中部新垦荒地土壤养分空间变异特征 |
| Spatial variability of nutrients in newly cultivated soil of Xiaojingzi Farm |
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| DOI：10.7606/j.issn.1000-7601.2007.04.29 |
| 中文关键词: 新垦荒地 地统计学 空间变异 |
| 英文关键词:newly cultivated soil geostatistics spatial variation |
| 基金项目:中-加合作NMS项目（PPI/PPIC） |
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| 中文摘要: |
| 结合传统统计学、地统计学方法对新垦荒地土壤养分的空间变异性进行了分析研究。结果表明，土壤OM含量极低，土壤有效P极缺乏, NH+4-N缺乏，有效K局部缺乏，有效Ca、Mg、S含量丰富，尤其有效Ca含量较高。土壤OM、NH+4-N、有效P、K、Ca、Mg和S的变异系数在36.0%～164.6%之间。土壤OM及有效P含量的变异较大, 变异系数分别为87.8%及164.6%；土壤K和NH+4-N次之, 变异系数分别为52.7%及53.4%，有效Ca、Mg、S的变异相对较小，变异系数分别为36.0%、37.6%和46.5%。地统计学半方差分析结果显示，土壤各养分的空间变异结构有较大区别。有效P、K、Mg、S的基底效应介于25%～75%之间，具有中等程度空间相关性。OM、有效Ca及NH+4-N的基底效应均>75%，空间相关性较弱。根据半方差分析结果，利用GS+ For Windows的Kriging最优内插法制作等值线分布图，从图中看出土壤OM、有效P、K的空间分布变异较小，分布均匀，NH+4-N的空间分布变异较大，有效Ca、Mg、S的空间分布具有中等程度的变异。 |
| 英文摘要: |
| Spatial variability of nutrients in new cultivated soil was studied by geostatistical and traditional statistics analysis，in order to obtain scientific basis of demonstrating soil nutrients management and balancing fertilization technology for new cultivated soil of Xiaojingzi Farm. The system evaluation result of soil nutrients showed that soil available P is badly deficit, NH+4-N is deficit, available K sporadically deficit and the content of available Ca, Mg and S are abundant, and especially the content of available Ca is quite high. Statistical analysis result of soil nutrients showed variation coefficients of soil OM, NH+4-N, available P, K, Ca, Mg and S range from 36.0% to 164.6%. Variation of soil OM and available P is comparatively high, variation coefficients is 87.8% and 164.6% respectively; variation of soil NH+4-N and available K is high, variation coefficients is 52.7% and 53.4% respectively; variation of soil available Ca, Mg and S is relatively low, variation coefficients is 36.0%, 37.6% and 46.5% respectively. Result of semi-variance analysis with geostatistics showed that spatial variation relativity of soil nutrients presented rather great differentiation. Nugget/sill of soil available P, K, Mg and S range from 25% to 75%, and present moderate spatial dependence; and nugget/sill of soil OM, Ca and NH+4-N are more than 75%, and present weak spatial dependence. Isoline maps of soil nutrients are made by the best Kriging interpolated according to result of semi-variance analysis. Isoline maps of soil nutrients indicated that spatial distribution variation of OM, available P and K was less, and distribution is relatively in equality; that of NH+4-N present strong, and Ca, Mg and S present moderate variation. Variation of NH+4-N mainly caused by fertilization and cultivation, variation of available Ca, Mg, S, OM and K mainly caused by soil tiny variation and soil texture, terrain and agrotype and cultivation and irrigation, variation of available P mainly caused by soil character and soil texture, terrain and agrotype. |
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