实生繁殖型板栗林改造技术研究

Study on transformation technology for chestnut forest of seedling propagation type

结合湖南实生繁殖型板栗低产林成因,通过良种改造和改善种植密度两方面入手对其进行改造示范.结果表明,选育的新品种板栗7号、板栗8号、板栗9号和板栗11号单位冠幅面积产量都较对照铁粒头有较大提高,其中板栗7号单位冠幅面积产量最高,达到了502g/m2,增产幅度达到了40%,其他几个品种增幅保持在20% ～30%之间,板栗8号平均冠幅面积最小,而且植株间变化差异不大,板栗7号单位冠幅果实个数最高,达到了17个,但是坚果单果质量稍小一些,约12g左右,板栗9号和板栗11号单位冠幅面积果实个数较少,但是坚果单果质量较大,达到了14g左右,植株间的差异也不明显;板栗林在密度改善方面以密度3m×4m为主进行疏伐.

Combining with the causes of low yield chestnut forest of seedling propagation type in Hunan,we expounds two aspects of solution with varieties and planting density improvement.The results show that the per unit crown area produc-tion of new breeding varieties of Chinese chestnut 7,8,9 and 11 are improved greatly than the Tielitou,Chinese chestnut 7 is the highest yield with 502 g/m2 and increased by 40%,other varieties of increased between 20% and 30%.The crown average area of Chinese chestnut 8 is the smallest,and the variances among individuals are small.The fruit number of Chinese chestnut 7 per unit crown area is highest (up to 17),while per fruit weight is smaller (about 12 g).The fruit number of Chinese chestnut 9 and 11 per unit crown area are small,but per fruit weight are bigger (up to 14 g).Chest-nut forest density should be with 3 m ×4 m for thinning.