不同坡位对闽楠杉木混交林中闽楠生长的影响研究

Research on Phoebe bournei Growth at Different Slope Positions in Phoebe bournei and Cunninghamia lanceolata Mixed Forest

通过研究闽楠和杉木混交林分中的不同坡位闽楠保存株数、胸径、树高和冠幅等植物生长发育状况,研究结果显示:坡位对混交林的闽楠保存率和冠幅生长发育影响不大;对闽楠胸径、树高、单株材积、单位亩蓄积的生长发育影响明显。下坡闽楠平均胸径比中坡增长了14.29%、比上坡增长了33.33%,中坡比上坡增长了16.67%;下坡平均树高与中坡相比较高13.95%、与上坡相比较高25.64%,中坡与上坡相比较高10.26%;平均单株材积下坡与中坡相比较高50.98%、与上坡相比较高120%,中坡与上坡相比较高45.71%;平均单位亩蓄积下坡与中坡相比较高46.06%、与上坡相比较高117%,中坡与上坡相比较高48.90%。从培育用材林的目标考虑,以培育闽楠为目标树种的闽楠杉木混交林适宜选择在林地的中、下坡位进行造林。

By investigating the growth and development condition of Phoebe bournei in mixed forests of Phoebe bournei and Cunninghamia lanceolata at different slope positions,the number of preserved plants,diameter at breast height,tree height,and crown width were included.The research results showed that the slope position had little effect on the preservation rate and crown growth of Phoebe bournei in mixed forest;However,it had a significant impact on the growth and development of Phoebe bournei's diameter at breast height,tree height,individual plant volume,and unit acre volume.Firstly,the average diameter at breast height of Phoebe bournei on the downhill slope was 0.7 cm larger compared to the middle slope,and 1.4 cm larger than that on the uphill slope;the average diameter at breast height on the middle slope was 0.7 cm larger compared to the uphill slope;Secondly,the average tree height on the downhill slope was 0.6 m higher compared to the middle slope,and 1.Om higher than that on the uphill slope,the average tree height on the middle slope was 0.4 m higher compared to the uphill slope;Thirdly,the average single plant volume on the downhill slope was 0.0026 m^(2)higher compared to the middle slope,and 0.0042 m^(2)higher than that on the uphill slope,the average single plant volume on the middle slope was 0.0016 m^(2)higher compared to the uphill slope;Lastly,the average volume per mu on the downhill was 0.4581 m^(2)higher compared to the middle slope,and 0.7847 m^(2)higher than that on the uphill,the average volume per mu on the middle slope was 0.3266 m^(2)higher compared to the uphill slope.Therefore,considering the goal of cultivating timberland,the mixed forest of Phoebe bournei and Cunninghamia lanceolata with Phoebe bournei as the target tree species is suitable to be planted in the middle and downhill slope.