摘要
按完全随机区组设计设置13 333、16 667、22 222、33 333和66 667株·hm^(-2)5个栽植密度,解析栽植密度对杜仲单株生长指标及单位面积地上部分生物量的影响,为杜仲短周期矮林模式栽植密度设置提供依据。杜仲单株的分枝数、基径、单株叶片数量、单位面积叶片质量等生长指标与栽植密度均呈显著的负相关关系,而叶面积指数与密度呈极显著正相关关系。单株叶干质量、单株皮干质量、单株杆质量与栽植密度均呈极显著的负相关,单位面积叶生物量、皮生物量、杆生物量均与栽植密度呈极显著的正相关关系。栽植密度66 667株·hm^(-2)的平均叶面积指数达到7.98,单位面积的叶、皮和茎干的生物量为6 864.84、1 605.73、11 445.30 kg·hm^(-2),分别是栽植密度13 333株·hm^(-2)的2.5、2.8、2.7倍。试验结果表明为获得更高的产量,短周期杜仲矮林栽培模式应选择更高的栽植密度(66 667株·hm^(-2))。
With a Eucommia SRC plantation with five planting densities of 13 333,16 667,22 222,33 333,and 66 667 stems·hm-2,we analyzed the impact of planting density on individual tree growth characteristics and above ground biomass per unit ground area,and provided theoretical guidance for planting density settings of Eucommia SRC.We compared the differences of individual tree growth characteristics among different densities,and analyzed relations between growth indexes and planting density and the impact of density on biomass production per unit ground area.The average sprouting branches,basal diameter,number of leaf per tree,and leaf weight ratio were significantly negatively correlated with planting densities;while LAI was significant positively correlated with densities.The average dry weight of leaves,barks and trunk without bark per plant were negatively correlated with densities,while the biomass per unit ground area of leaf,bark and trunk(without bark)was positively correlated with densities.Particularly,they were significant positively correlated with LAI.LAI under density of 66 667 stems·hm-2 was 7.98,and the biomass values of leaf,bark and trunk were 6 864.84,1 605.73,and 11 445.30 kg·hm-2,increased by 2.5-,2.8-,and 2.7-fold over those under density of 13 333 stems·hm-2,respectively.Based on the management philosophy of annually harvesting leaf,bark,and stolk,Eucommia SRC could be planted in higher densities,such as 66 667 stems·hm-2 to produce more biomass per unit ground area per year.
作者
刘慧东
丁欢欢
朱景乐
殷世雨
李铁柱
杜红岩
孙志强
Liu Huidong;Ding Huanhuan;Zhu Jingle;Yin Shiyu;Li Tiezhu;Du Hongyan;Sun Zhiqiang(Paulownia R&D Center of China,Chinese Academy of Forestry,Zhengzhou 450003,P.R.China;Xinyang Nanwan Experimental Forest Farm;Paulownia R&D Center of China,Chinese Academy of Forestry)
出处
《东北林业大学学报》
CAS
CSCD
北大核心
2018年第4期1-5,共5页
Journal of Northeast Forestry University
基金
“十三五”国家重点研发计划(2017YFD0601302)。
关键词
杜仲
短周期矮林
密度效应
生长指标
叶面积指数
生物量
Eucommia ulmoides
Short-rotation coppice
Density effect
Growth index
Leaf area index
Biomass
