Effect of Forest Thinning on the Light Environmentof Quercus Variabilis Plantation and its Target Trees

doi:10.13466/j.cnki.lyzygl.2021.04.011

Abstract

Abstract:

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.

Key words: canopy structure, light environment, target tree, forest thinning, Quercus variabilis plantation

CLC Number:

S753

ZHANG Yanyan, WANG Qunxing, LUO Yusheng, LV Kangting, MA Ruiting, YAN Dongfeng. Effect of Forest Thinning on the Light Environmentof Quercus Variabilis Plantation and its Target Trees[J]. FOREST RESOURCES WANAGEMENT, 2021, (4): 79-85.

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类型	坡度/°	海拔/m	土层厚度/cm	平均树高/m	平均胸径/cm	郁闭度
对照区	7	630	40	8.00	10.1	0.9
间伐区	9	617	35	7.98	10.0	0.9

样地类型	东经	北纬	海拔/m	林木总数/株	平均树高/m	平均胸径/cm	目标树/株
对照样地	112°56'21″	34°27'19″	630	2113	8.91	10.53	64
间伐样地	112°56'17″	34°27'13″	617	1487	11.33	12.70	61

指标	林冠开度	叶面积指数	林下直射光	林下散射光	林下总光照	直射光消减率	散射光消减率
叶面积指数	-0.95	1.00
林下直射光	0.81	-0.74	1.00
林下散射光	0.98	-0.97	0.81	1.00
林下总光照	0.93	-0.88	0.96	0.94	1.00
直射光消减率	-0.81	0.74	-1.00	-0.81	-0.96	1.00
散射光消减率	-0.98	0.97	-0.81	-1.00	-0.94	0.81	1.00
总消减率	-0.93	0.88	-0.96	-0.94	-1.00	0.96	0.94

样地类型	林冠开度/%	叶面积指数	冠下辐射/(mol/(m²·d))			辐射消减率/%
样地类型	林冠开度/%	叶面积指数	林下直射光	林下散射光	林下总光照	直射光消减率	散射光消减率	总消减率
对照样地	26.301±3.493A	1.809±0.215B	5.820±0.994Ab	5.600±0.822Ab	11.421±1.707Aa	71.073±4.943Bb	72.166±4.084Ba	71.619±4.240Bb
间伐样地	21.663±2.178B	2.104±0.176A	4.379±0.663Bb	4.488±0.511Bb	8.868±1.005Ba	78.234±3.298Ab	77.693±2.542Aa	77.963±2.498Aa

样地类型	径阶 /cm	叶面积指数	平均叶倾角 /(°)	光合有效辐射 /(μmol/(m²·s))	漫射透射系数
对照样地	14	1.025±0.040Aa	45.462± 4.910Aa	109.5±120.972Ba	0.387±0.014Aa
	16	1.017±0.081Aa	43.449± 8.587Ba	92.917± 95.645Aa	0.390±0.034Ba
	18	1.010±0.094Aa	41.468± 7.180Ba	70.158± 49.561Aa	0.388±0.037Ba
	20	0.981±0.087Aa	40.130±12.790Ba	69.111± 54.061Aa	0.402±0.035Ba
间伐样地	14	0.975±0.075Ba	48.893±12.359Aa	197.090±182.55Aa	0.410±0.029Aa
	16	0.946±0.054Ba	49.424± 9.839Aa	117.381± 49.745Ab	0.422±0.024Aa
	18	0.941±0.039Ba	50.710±10.414Aa	123.313±108.112Ab	0.425±0.018Aa
	20	0.935±0.040Aa	48.193± 5.475Aa	124.385±110.185Ab	0.426±0.018Aa