为研究不同立地环境对林下楠木生长发育的影响,以贵州省普安县地瓜镇、江西坡镇、楼下镇、盘水街道办、普白林场和青山镇6个乡镇(街道办)为试验地点,设置样地包括2个郁闭度:0.55～0.60、0.60～0.65和3个坡度:15°、25°、35°,对不同坡度和郁闭度下楠木的冠幅、株高、地径、成活率和其叶片的叶绿素和类胡萝卜素含量、净光合速率进行评估,比较不同立地环境对林下楠木生长发育的影响.结果表明:郁闭度:0.55～0.60、坡度15°条件下楠木的冠幅、株高、地径和成活率均最高,分别为:2.61 m、3.38 m、3.54 cm、82％;该条件下楠木叶片的叶绿素a、叶绿素b、类胡萝卜素含量和净光合速率均最高,分别为:1.37、0.45、2.03 mg/g和7.41 U mol/(m2·s).研究为楠木选择合理的立地条件提供参考.
Influence of Site Environment on the Growth and Development of Understory Phoebe zhennan S.Lee
To study the effects of different site environments on the growth and development of understory Phoebe zhennan S.Lee,this study used six townships(street offices)in Pu'an County,Guizhou Province,including Digua Town,Jiangxi Po Town,Louxia Town,Panshui Street Office,Pubai Forest Farm,and Qingshan Town,as experi-mental sites.Two canopy closure degrees(0.55～0.60 and 0.60～0.65)and three slopes(15,25,and 35 degrees)were set up to evaluate the crown width,plant height,diameter,survival rate,chlorophyll and carotenoid content,and net photosynthetic rate of Phoebe zhennan S.Lee under different slopes and canopy closure degrees.The effects of different site environments on the growth and development of understory Phoebe zhennan S.Lee are compared.The results show that under the conditions of canopy closure ranging from 0.55 to 0.60 and a slope of 15 degrees,the crown width,plant height,ground diameter,and survival rate of Phoebe zhennan S.Lee were the highest,with values of 2.61 m,3.38 m,3.54 cm,and 82％,respectively;Under these conditions,the chlorophyll a,chlorophyll b,carotenoid content,and net photosynthetic rate of Phoebe zhennan S.Lee leaves were the highest,at 1.37 mg/g,0.45 mg/g,2.03 mg/g,and 7.41 Umol/(m2·s),respectively.This study provides a theoretical basis for selecting reasonable site conditions for Phoebe zhennan S.Lee.
slopecanopy closure degreeunderstory Phoebe zhennan S.Leegrowth status
万方数据
维普
