【摘要】 为探明油茶丰产原因,并为低产林改造提供依据,对以往调查研究认为典型的17块油茶丰产林的土壤肥力、林分结构进行了调查和研究。结果表明:丰产林产茶油180～540kg/hm2,是一般油茶林的4～10倍,其中0.67hm2以下的小面积丰产林平均产油量高达420kg/hm2以上。丰产林的土层厚度、土壤全氮和速效磷、钾肥的含量均显著高于对照林,土壤有效钙含量和盐基饱和度与油茶产量密切相关。丰产林的郁闭度为0.81～0.94,叶面积指数为2.36～5.37,叶效指数为7.15～16.57g/m2;坡地油茶林及树高、冠幅变异大的油茶林透光性好,受光面积大,叶效指数高。更多还原

【Abstract】 To explore the reasons for high-yield of Camellia oleifera stands,and provide a basis for the improvement of low-yield C. oleifera stands,soil fertility and stand structure of seventeen typical high-yield C. oleifera stands were investigated. The results indicated that the oil yield per hectare of high-yield C. oleifera stands ranged from 180 to 540 kg per hm2 ,which was 4-10 times as high as that of normal C. oleifera stands. The average oil yield per hectare of high-yield C. oleifera stands with an area smaller than 0.67 hm2 was as high as 420 kg. The soil thickness,total nitrogen content and content of rapidly available phosphate and potassium in the soil of high-yield C. oleifera stands were significantly higher than those of normal stands. Available calcium content and base saturation in the soil were closely correlated with oil yield of C. oleifera stands. The canopy closure,leaf area index and leaf efficacy index (oil yield per unit leaf area) of high-yield C. oleifera stands were 0.81～0.94,2.36～5.37 and 7.15～16.57 g/m2,respectively. C. oleifera stands on the slope and those with big variations in tree height and crown width had a better light transmission and a higher leaf efficacy index.更多还原