Effects of Mixed Betula luminifera and Phyllostachys edulis with Different Proportions on the Growth of Cunninghamia lanceolata after Thinning

doi:10.13466/j.cnki.lczyyj.2024.02.015

Abstract

Abstract:

Scientifically reasonable mixed planting can restore soil fertility,enhance forest productivity,improve low-quality and low-efficiency forests,and achieve scientifically efficient management of Cunninghamia lanceolata plantations.By conducting forest thinning in Cunninghamia lanceolata plantations,mixed forests can be created with different proportions of Cunninghamia lanceolata and other species such as Betula luminifera or Phyllostachys edulis.This includes combinations with ratios of Cunninghamia lanceolata to Betula luminifera or Betula luminifera at 1∶1,2∶1,and 3∶1,respectively.The objective is to investigate the effects of mixed planting on the growth characteristics and functional traits of Cunninghamia lanceolata individuals.The results indicate that:1)Compared to pure forests,mixed planting increases the intensity of competition among trees.Additionally,the competition intensity between Cunninghamia lanceolata and Betula luminifera in mixed forests is lower than that between Cunninghamia lanceolata and Phyllostachys edulis.2)Mixed planting of Cunninghamia lanceolata with Betula luminifera and Phyllostachys edulis both increase the leaf area index(LAI)of Cunninghamia lanceolata.3)With the increase in Cunninghamia lanceolata retention density,the contents of available nitrogen,available phosphorus,and organic matter in the soil decrease.Compared to pure forests,mixed planting leads to a decrease of available nitrogen content in the soil but an increase in available phosphorus.4)As the retention density of Cunninghamia lanceolata increases,the individual tree volume of Cunninghamia lanceolata decreases,while the total stand volume increases in contrast.In Cunninghamia lanceolata mixed forests with Betula luminifera and Phyllostachys edulis,both the individual tree volume and the stand volume of Cunninghamia lanceolata are higher than those in pure forests of Cunninghamia lanceolata alone.In Cunninghamia lanceolata mixed forests with Betula luminifera,the individual tree volume and stand volume of Cunninghamia lanceolata are similarly greater than those in mixed forests with Phyllostachys edulis.5)The Hegyi competition index shows a highly significant negative correlation with the individual volume of Cunninghamia lanceolata(P<0.01);the individual volume of Cunninghamia lanceolata is significantly positively correlated with leaf area(P<0.05);available phosphorus is highly significantly positively correlated with individual volume and stand volume(P<0.01),and soil organic matter content is significantly positively correlated with stand volume(P<0.05).Based on the above findings,Cunninghamia lanceolata mixed forests with Betula luminifera are superior to those with Phyllostachys edulis in various aspects.Additionally,when the ratio of Cunninghamia lanceolata to Betula luminifera is 1∶1,it has the best promoting effect on the individual growth of Cunninghamia lanceolata,which is beneficial for cultivating large-diameter Cunninghamia lanceolata and improving stand quality.At the same time,attention should be paid to stand yield.When the ratio of Cunninghamia lanceolata to Betula luminifera is 3∶1,the stand volume of Cunninghamia lanceolata is maximized.

Key words: Cunninghamia lanceolata, Hegyi competition index, leaf area index, available phosphorus, stand volume

CLC Number:

S756.9

SUN Kun, WU Dayu, SUN Honggang. Effects of Mixed Betula luminifera and Phyllostachys edulis with Different Proportions on the Growth of Cunninghamia lanceolata after Thinning[J]. Forest and Grassland Resources Research, 2024, (2): 124-132.

Figures/Tables 7

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类型	树种组成	林龄/a	每公顷保留杉木株数/个	每公顷伐除杉木株数/个	每公顷混交树种株数/个
1杉1桦	混交林	23/9	156	2 183	156
2杉1桦			278	2 076	156
3杉1桦			500	1 825	156
1杉1毛		23/9	156	2 234	156
2杉1毛			278	2 119	156
3杉1毛			500	1 851	156
CK1	纯林	23	156	2 216
CK2			278	2 130
CK3			500	1 945

类型	速效氮/(mg/kg)	有效磷/(mg/kg)	pH值	有机质/(g/kg)
1杉1桦	383.39±63.45a	4.16±0.46a	4.68±0.18a	182.42±40.16a
2杉1桦	378.25±71.43ab	4.11±0.29a	4.76±0.24a	168.76±43.87a
3杉1桦	366.67±66.97b	4.09±0.36a	4.73±0.15a	154.31±39.65ab
1杉1毛	372.42±52.63b	3.92±0.22ab	4.74±0.29a	155.69±25.48ab
2杉1毛	369.68±59.74b	3.79±0.44ab	4.67±0.28a	135.12±29.33bc
3杉1毛	361.45±68.23bc	3.61±0.51bc	4.70±0.33a	122.55±32.24cd
CK1	398.38±69.35a	3.85±0.52ab	4.81±0.11a	102.14±33.23cd
CK2	384.96±58.51a	3.64±0.34bc	4.70±0.09a	89.32±24.57cd
CK3	377.43±72.05ab	3.17±0.73c	4.75±0.15a	70.43±30.84d

因子	Hegyi	叶面积指数	速效氮	有效磷	pH值	有机质	单株材积	林分蓄积
Hegyi	1
叶面积指数	-0.13	1
速效氮	-0.14	0.18	1
有效磷	-0.26	0.35	-0.13	1
pH值	-0.60	0.09	0.20	0.18	1
有机质	-0.21	0.76^**	0.92^**	-0.16	-0.11	1
单株材积	-0.71^*	0.64^*	0.32	0.83^**	0.31	0.64^*	1
林分蓄积	-0.41	0.27	0.33	0.77^**	0.41	0.53^*	0.36	1