造林密度对新疆杨人工林生长发育和光合特性的影响  

Effect of planting density on the growth and photosynthetic characteristics of Xinjiang poplar plantation

作　　者：黄彩霞[1] 张明 巴玉春 张恒嘉[1] 康燕霞[1] 王玉才[1] 

机构地区：[1]甘肃农业大学工学院,甘肃兰州730070 [2]甘肃省民乐县洪水河管理局,甘肃民乐734503

出　　处：《甘肃农业大学学报》2017年第2期61-64,70,共5页Journal of Gansu Agricultural University

基　　金：甘肃省科技厅支撑计划(1304FKCA095)

摘　　要：【目的】探索河西绿洲区新疆杨适宜种植密度,为新疆杨人工林的集约栽培提供科学依据.【方法】以新疆杨(Populus alba L.var.pyramidalis Bge.)为研究对象,研究3种造林密度(株距×行距分别为2m×3m、3m×4m、4m×5m)对新疆杨生长发育及光合特性的影响.【结果】不同造林密度间新疆杨人工林单株材积、胸径、树高均存在显著差异,并随林龄增加差异更加明显.4m×5m配置新疆杨人工林的胸径、单株材积大于其他两种密度,同时具有较高的光合速率(P_n)、蒸腾速率(T_r)、气孔导度(Gs)和较低的胞间CO_2浓度(C_i).相关分析表明,日均Pn、Tr与胸径、树高、单株材积呈显著正相关,Gs仅与树高呈显著正相关,C_i与各生长指标均呈负相关.【结论】株距×行距为4m×5m配置是河西新疆杨种植的最佳密度.[Objective] To explore the optimum planting density of Xinjiang poplar plantation in order to provide scientific basis for intensive its cultivation in Hexi oasis area. [Method] Field test was conducted to investigate the difference in the growth and photosynthetic characteristics of poplar plantation. Three treatments （planting spacing including 2 m × 3 m, 3 m × 4 m, 4 m × 5 m） were designed for poplar planta- tion. [Result] There were significant differences in individual volume, diameter at breast height（DBH） and height among three densities, and the difference was more obvious with increase of stand age. DBH and in- dividual volume was higher under the density of 4 m× 5 m than the other densities and had the higher pho- tosynthetic rate（Pn）, transpiration rate（Tr）, the stomata conductance（Gs） and lower intercellular CO2 con- centration（Ci）. There were markedly positive correlations between Pn, Tr and individual volume, DBH, height, negative correlations between Ci and above growth indexes, and Gs only had a significant positive correlation with the height. [Conclusion] The best density for Xinjiang poplar plantation is 4 m ×5 m in Hexi area.

关 键 词：新疆杨人工林 造林密度 光合特性 河西绿洲 

分 类 号：S753.3[农业科学—森林经理学]