韩城市花椒经济林冠层特性及土壤养分特征研究

Research on Canopy Characteristics of Zanthoxylum bungeanum and Soil Nutrients in the Land Grown Zanthoxylum bungeanum in Hancheng Region

在韩城市花椒林基地选取不同立地条件的花椒树作为研究对象,用Hemi-View植物冠层半球影像系统测定了其冠层特性,分析了不同立地条件下的花椒树冠层特性及其与光照的关系,以及研究在不同立地条件下花椒地土壤养分状况及其与冠层变化关系,结果表明:南坡水平梯田花椒树的冠型参数(ELADP)、平均叶倾角(MLA)、直射光立地系数(ISF)、散射光立地系数(DSF)和综合光立地系数(GSF)均大于北坡水平梯田和平地,南坡水平梯田花椒截获太阳辐射能力最强,平地次之,北坡水平梯田最弱。3种立地条件下的花椒地土壤有机质、磷素不足,其中平地土壤有机质和磷素亏缺严重;氮素处于中等水平;钾素尤为丰富。因此,应加大有机肥和磷肥的投入,从而提高花椒的产量和品质。

The canopy characteristics and the relative light radiation of Zanthoxylurn bungeanum under dif- ferent site conditions were studied by Hemi-iew canopy hemispherical co-ordinate system in Hancheng Re- gion. Analysis of different site conditions of Zanthxylum bungeanum canopy characteristics and soil nutri- ent status and its changes in the relationship with canopy was carried out. The results showed that the el- lipsoidal leaf angle distribution parameter （ELADP）, the average leaf angle （MLA）, indirect site factor （ISF）, direct site factor（DSF）and global site factor（GSF） of Zanthoxylum bungeanurn in South slope level terrace were higher than that in North slope level terrace and flat ground. Zanthoxylurn bungeanum in South slope level terrace intercepting the solar radiation ability was the strongest, the flat ground next best, north slope level terrace is the weakest. The lands under different site conditions were lack of organic matter and available phosphorus, especially in flat ground; the available nitrogen is in the medium level; the available potassium element was rich. Therefore, the organic fertilizer and the phosphate fertilizer in- vestment should be increased, which could enhancethe output and quality of Zanthoxylum bungeanurn.