浙江楠苗期生长和光合特性研究

Studies on the seedling growth and photosynthetic characteristics of Phoebo chekiangensis Shang

对浙江楠在南京地区的苗期生长特性和光合特性进行了研究。研究结果表明: (1)浙江楠苗期生长呈现指数生长规律,第1a生长较慢,从第2a起呈现加速生长趋势。浙江楠苗期高生长、地径生长和根系生长的指数函数分别是Y=7 106 2e1 058 4X(R2 =0 960 8),Y=15 841e0 452 1X(R2 =0 998 0),Y=0 254 6e0 600 9X(R2 =0 989 4); (2)浙江楠幼苗主根明显,侧根不发达,表现出深根性树种的早期特性; (3)浙江楠苗期表现出一定的喜光特性, 3年生浙江楠的光饱和点约为1 200μmol·m-2·s-1,光补偿点约为20μmol·m-2·s-1。

Based on experiment and investigation in Nanjing region, the photosynthetic and growth characteristics of Phoebo chekiangensis were studied. The results were drawn as follows:(1)During seedling period, Phoebo chekiangensis grows up according to Y=a×e^(bX), with height-growth exponent equation Y=7.106 2e^(1.058 4X) (R^2=0.960 8), diameter-growth exponent equation Y=15.841e^(0.452 1X) (R^2=0.998 0) and root-growth exponent equation Y=0.254 6e^(0.600 9X) (R^2=0.989 4);(2)Phoebo chekiangensis seedlings develop main roots even in nursery period;(3)Three-year-old Phoebo chekiangensis seedling, whose light saturation point(LSP) was up to (1 200 μmol·m^(-2)·s^(-1)) and light compensation point(LCP) (20 μmol·m^(-2)·s^(-1)), showed suntree’s characteristics.