Forest and Grassland Resources Research >
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
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.
Yanyan ZHANG , Qunxing WANG , Yusheng LUO , Kangting LV , Ruiting MA , Dongfeng YAN . Effect of Forest Thinning on the Light Environmentof Quercus Variabilis Plantation and its Target Trees[J]. Forest and Grassland Resources Research, 2021 , 0(4) : 79 -85 . DOI: 10.13466/j.cnki.lyzygl.2021.04.011
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