红壤甘蔗地土壤pH及中、微量元素含量空间变异研究

Study on Small-Scale Spatial Variability of Soil Micronutrients in Red Soil Sugarcane Field

通过对广西来宾市红壤丘陵甘蔗地小尺度的空间分析研究表明,土壤pH空间变异强度弱,其它研究项目养分含量空间变异强度均为中等。土壤pH、交换性镁、有效锰、有效硅的空间分布体现为中等空间相关性,而交换性钙、有效铜、有效锌、有效铁的空间相关性强。研究蔗地土壤pH和中、微量营养元素空间有效变程为138.3m～3105.0m。蔗地土壤空间分布图能反映出土壤各研究项目各自的空间分布特征,并可用于优化施肥决策。

A Sugarcane field experiment was conducted at Laibin in the Guangxi Zhuang Autonomous Region, China. Results obtained from statistical analysis indicated that the variable intensity of soil pH was low, while that of soil available micronutrients was mid-range. From the results of geostatistical analysis, the spatial correlations of soil pH, exchangeable Mg, available Mn and available Si were moderately dependent. Their spatial variability was caused by structural and random factors. Moreover, the spatial correlations of soil exchangeable Ca, available Cu, available Zn and available Fe were strongly dependent. Their spatial variability was mainly caused by structural factors. The effective range of these items was 138.3 to 3105.0 meters. The maps from the Ordinary Kriging Method showed that each item had its own distribution pattern. The maps revealed the distribution values of the cane field, and could be used to conduct optimal fertilization for sugarcane planting.