抚育间伐对栓皮栎人工林及其目标树光环境的影响
收稿日期: 2021-05-11
修回日期: 2021-07-15
网络出版日期: 2021-09-26
基金资助
河南省重大公益专项(201300111400);河南省重点研发与推广专项(科技攻关)(192102110060)
Effect of Forest Thinning on the Light Environmentof Quercus Variabilis Plantation and its Target Trees
Received date: 2021-05-11
Revised date: 2021-07-15
Online published: 2021-09-26
为了探讨抚育间伐对栓皮栎人工林及其目标树光环境的影响,在登封林场40a生栓皮栎人工林内设置了2块面积为1hm2固定样地(分别为间伐和对照样地),采用半球面影像技术和植物冠层技术获取了全林及目标树冠层图像,比较分析了间伐和对照样地冠层结构和光环境指标差异规律。结果表明,间伐样地林冠开度和林下光照辐射显著低于对照样地(P<0.05),而叶面积指数和光照消减率则显著高于对照样地(P<0.05);林冠开度与林下光照呈极显著正相关关系(P<0.01),叶面积指数与林冠开度、林下光照呈极显著负相关关系(P<0.01);间伐样地径阶为14,16,18cm的目标树平均叶面积指数均显著低于对照样地相应数值(P<0.05),但间伐样地径阶20cm的目标树平均叶倾角和漫射透射系数均显著高于对照样地相应数值(P<0.05)。抚育间伐改善了林分的冠层结构,林下光照强度增强,目标树光合有效辐射增加,光合能力得到明显提升。研究结果对于栓皮栎人工林大径材培育和制定人工促进天然更新措施具有一定参考价值。
张妍妍 , 王群星 , 骆雨生 , 吕康婷 , 马瑞婷 , 闫东锋 . 抚育间伐对栓皮栎人工林及其目标树光环境的影响[J]. 林草资源研究, 2021 , 0(4) : 79 -85 . DOI: 10.13466/j.cnki.lyzygl.2021.04.011
In order to explore the effect of forest thinning on the light environment of Quercus variabilis plantation and its target trees,two fixed plots(thinned and control plots,respectively) with the area of 1hm 2 were established in 40a Quercus variabilis plantation in the Dengfeng Forest Farm,hemispherical photography and plant canopy analysis techniques were used to obtains the canopy images of the whole stand and the target trees,and the difference discipline of canopy structures and light environmental parameters between thinned and control plots.The results showed that the canopy openness and understory light radiation in thinned plot were significantly lower than those in control plot(P<0.05),and the leaf area index and light reduction rate were significantly higher than those in control plot(P<0.05).Canopy openness and understory light had significantly positive correlations(P<0.01),and the leaf area index was significantly negative correlated with the canopy openness and understory light(P<0.01).The average leaf area indexes of the target trees with the diameter of 14cm,16cm and 18cm in the thinned plot were lower than that in control plot(P<0.05),but the mean leaf angles and diffuse transmission coefficients of the target trees with 20cm diameter in thinned plot were significantly higher than those in control plot(P<0.05).Forest thinning improved the forest canopy structure,enhanced the intensity of understory light,and the target tree photosynthesis effective radiation increased,photosynthesis capacity improved.The research results have certain reference value for the cultivation of large-diameter timber in the Quercus variabilis plantation and the formulation of artificial measures to promote natural regeneration.
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