洞庭湖区典型菜园土壤主要养分的空间变异——以岳阳广兴洲为例

Spatial variation of main nutrient in typical vegetable soil of Dongting Lake:A case study in Guangxingzhou county of Yueyang district

为加强洞庭湖区菜园土壤的养分管理,控制其养分流失,采用传统统计和地统计学相结合的方法,研究其土壤养分含量的空间变异特征和分布规律.结果表明,土壤碱解氮、有效磷、速效钾含量分别为54.2～315.3、10.9～64.8、19.5～87.9mg/kg,有机质含量为14.53～26.22g/kg,养分含量较高.土壤主要养分属于中等变异,变异系数为0.1～1.0.从趋势分析看,土壤碱解氮、有效磷、速效钾、有机质含量从东向西和从南到北均呈一阶线型变化.从空间分布结构看,碱解氮和有机质含量呈基本一致的空间环状分布,以菜园地中心区较低;有效磷由东南向西北呈条带状分布,中部含量较高,速效钾含量由东南向西北呈马鞍形分布.

Spatial variability and distributing rules of nutrients content in vegetable soil were studied using traditional statistics and geo-statistics in order to implement nutrient management and control its losses in Dongting Lake. The results showed that： the content of available nitrogen, phosphorus and kalium were respectively 54.2-315.3 mg/kg, 10.9--64.8 mg/kg, 19.5~87.9 mg/kg, and organic matter ranged from 14.53 to 26.22 g/kg, the level of nutrient content was high. The variable coefficient of main nutrient content was between 0.1 and 1.0, which belonged to medium variation. All the nutrient indexes such as available nitrogen, phosphorus, kalium and organic matter presented linear first-order variation by tendency analysis. For the spatial distributing structure, content of available nitrogen and organic matter presented a distributing model of circline and the content was lower in central vegetable field; available phosphor showed a distributing model of ribbon from southeast to northwest and its content was high in the central part of vegetable field; however, available potassium had a distributing shape of saddle.