琼中县橡胶园土壤氮素空间变异及分区管理研究

Spatial Variability and Regionalized Management of Soil Nitrogen in the Rubber Plantation in Qiongzhong County

运用地统计学,结合GIS技术对海南省琼中县橡胶园土壤氮素营养进行了空间变异特征及分区管理研究。结果表明,琼中县橡胶园土壤全氮供应水平较低,碱解氮供应较为充足,各土层土壤全氮和碱解氮含量的最大相关距离在51.03～68.93 km之间,0～20 cm土层全氮养分含量具有较弱的空间相关性,20～40 cm土层全氮养分含量具有中等程度的空间相关性;两土层碱解氮养分含量具有中等程度的空间相关性;全氮含量和碱解氮含量呈现较明显的空间分布格局,各土层全氮和碱解氮含量各等级的大块状分布较明显;应用空间叠加方法,对橡胶园土壤氮素进行了管理分区,琼中县胶园可分为5个管理分区,在胶园施肥管理中应根据不同管理分区的特点采取不同的氮素营养管理措施。

Geo-statistics and GIS were applied to analyze the spatial variability and regionalized management of soil nitrogen(N) in rubber plantation located in Qiongzhong County.The results showed that the content of total N in soil was relatively low and content of available N was relatively enough.The maximum correlative distance between the content of total N and content of available N in different soil layers ranged from 51.03 km to 68.93 km,in which total N content in 0～20 cm of soil layer had weak spatial correlation,while total N content in 20 ～40 cm of soil layer had moderate spatial correlation;and available N content in both soil layers had moderate spatial correlation.The contents of total N and available N showed a relatively obvious spatial distribution pattern,and it distributed in a large block scale in each soil layer.By spatial overlaying method,regionalized management map of the soil N was drawn,which divided five management units for rubber plantation in Qiongzhong county.Thus,the N content should be controlled based on the characteristics of each management unit in rubber plantation in Qiongzhong county.