摘要
通过对仪征市第二次全国土壤普查、1994年土壤普查、2000年土壤养分调查、2005年农业部测土施肥试点土壤养分数据，应用地统计和GIS技术进行时空变异特征分析，研究结果发现：20年间大部分土壤养分都具有良好的半方差结构，土壤速效钾的变化分2个变化时期，前期减少后期增加，以1994年为分水岭；土壤pH呈略为的下降趋势；速效磷平均含量不高，变化不明显；有效锌含量比较稳定平均含量在1．0mg／kg；有机质含量呈稳定的上升趋势，平均每年增加3．0％。在本研究区域内，除了有效锌，其他土壤养分均存在一定的显著性差异，运用Cochran公式对研究区域样本容量进行估计，结果表明：研究区域范围土壤养分5％～10％的相对误差和95％置信水平条件下，能满足农业部测土配方施肥的精度，合理取样数量分别为：pH26个、有机质199个、速效钾52个、速效磷410个、有效锌310个。
The soil general survey data from 1984, 1994,2000 and 2005 were used to study the spatial-temporal variation of available potassium in field of wheat-rice double cropping system in Yizheng City of Jiangsu Province by using Geostatistics method and GIS technique. The results showed that most soil nutrients possessed typical semi-variance structure. The soil available potassium change is divided into two periods：The earlier period reduction, later period increases, take 1994 as the breakpoint;soil pH assumes the slightly drop tendency;the available phosphorus average content is in medium capacity;the available Zinc content was stable and the average content is 1.0mg/kg; the organic matter content showed stable trend of escalation, the relatively increasing rate was 3.0% every year. In the study area, the soil nutrient content varied significantly except the available Zinc, thus, the rational sampling quantity could be determined by using Cochran formula to compute stratified and rational distributed sampling at the base of county. The results showed that sum of this counties sample quantity under 95 % given level of 5 % - 10% relative error and significance, the amount of samples is 26 for pH determination, 199 for organic matter, 52 for available potassium, 410 for available phosphorus and the effective Zinc is 310.
出处
《石河子大学学报（自然科学版）》
CAS
2008年第6期686-690,共5页
Journal of Shihezi University(Natural Science)
基金
长江三角洲平原区农业生态系统研究项目(KSCXZ-YW-N-038)
关键词
土壤养分
时空变异
GIS
取样数量
soil nutrient
spatial-temporal
GIS
distributed sampling
