海南槟榔种植地土壤全氮及有效态氮分布特征

为了解决槟榔早衰、产量下降等难题.采用常规分析方法,研究槟榔土壤全氮及水解氮、铵态氮和硝态氮的分布特征.结果表明:硝态氮变异性强,变异系数大,分布不均匀;水解氮、铵态氮和全氮的变异性都属于中等程度,水解氮和全氮的变异系数相对少些,分布尚算均匀;对照区土壤铨氮含量显著高于槟榔园,全氮及有效态氮地区间差异十分显著,不同种植年限的全氮及有效态氮差异也显著.全氮平均值0.10(±0.04)%达到中等指标水平,但总体上全氮贫缺比例高达42.05%.水解氮平均值107.85(±34.77) mg/kg达到中等指标水平.但总体上水解氮贫缺比例高达35.625%.硝态氮平均值4.44(±5.31)mg/kg太低,揭示了土壤的氨化作用、硝化作用和异养硝化作用都减弱,阻碍槟榔正常生长所需求的有效营养供应.导致槟榔产量下降和植株早衰.硝态氮含量低是槟榔十壤地力退化的表现特征之一.

Spatial distribution of total nitrogen and available N in Areca catechu planting soils in Hainan

To address premature decline and low yield of Areca catechu,the spatial distribution of total nitrogen,hydrolysable nitrogen,ammonium nitrogen,and nitrate nitrogen in Areca catechu planting soils were researched by conventional analysis methods.The results showed that variable coefficient of nitrate nitrogen was very great,distribution was uneven,variable coefficient of hydrolysable nitrogen,ammonium nitrogen,and total nitrogen were moderate,variable coefficient of hydrolysable nitrogen and total nitrogen w...