Health assessment of Larix gmelinii var. principis-rupprechtii and Pinus sylvestris var. mongolica plantations in Saihanba Nature Reserve

doi:10.12302/j.issn.1000-2006.202204058

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2024, Vol. 48 ›› Issue (3): 199-206.doi: 10.12302/j.issn.1000-2006.202204058

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Health assessment of Larix gmelinii var. principis-rupprechtii and Pinus sylvestris var. mongolica plantations in Saihanba Nature Reserve

ZHAO Jinman(), HAN Xinyue, CHENG Ruiming, ZHANG Zhidong^*()

Hebei Province Key Laboratory of Forest Trees Germplasm Resources and Forest Protection, College of Forestry, Hebei Agricultural University, Baoding 071000, China

Received:2022-04-25 Revised:2023-08-31 Online:2024-05-30 Published:2024-06-14

Abstract

Abstract:

【Objective】 The study aimed to understand the health status of plantations in nature reserves for forest management and the construction of nature reserves. 【Method】 A total of 36 sample plots were surveyed in the pure Larix gmelinii var. principis-rupprechtii and Pinus sylvestris var. mongolica plantations in the Saihanba Nature Reserve of Hebei Province using the stratified random sampling method. A total of 17 indicators, including the five aspects of productivity, stand structure, species diversity, soil quality, and stability, were selected to establish an indicator system for assessing forest health. The forest health index was calculated by principal component analysis, and the forest health grades were classified using the K-means clustering method. The accuracy of the clustering results was verified by Fisher’s discriminant analysis. 【Result】 The forest health index of the study area ranged between -1.02 and 1.46. The soil quality and stand structure were the most important indicators that influenced forest health in the study area. The proportionate areas were in the following order: mid-health (50%) > unhealthy (25%) > sub-health (19%) > healthy (6%). The health status of L. gmelinii var. principis-rupprechtii forests was better than that of P. sylvestris var. mongolica forests for middle-aged (20-30 a) and near-mature (> 30 a) stands. The forest health indices of L. gmelinii var. principis-rupprechtii and P. sylvestris var. mongolica forests tended to decrease with increasing stand density. 【Conclusion】 The plantations in the Saihanba Nature Reserve were primarily in the mid-health and non-health states. Therefore, the findings revealed that effective management strategies are urgently necessary for improving forest health in the study area.

Key words: forest health, plantation, principal component analysis, Larix gmelinii var. prinoipis-rupprechtii, Prinus sylvestris var. mongolica, Saihanba Nature Reserve

CLC Number:

S757

ZHAO Jinman, HAN Xinyue, CHENG Ruiming, ZHANG Zhidong. Health assessment of Larix gmelinii var. principis-rupprechtii and Pinus sylvestris var. mongolica plantations in Saihanba Nature Reserve[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2024, 48(3): 199-206.

Figures/Tables 6

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References 43

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林龄/a stand age	林型 stand type	平均胸径/cm mean DBH	平均树高/m average height	林分密度/ (株·hm^-2) stand density
20~30	L	14.24±1.55	13.05±1.72	2 284.67±527.00
20~30	P	14.70±1.19	10.31±2.06	1 997.11±543.69
>30	L	20.64±1.63	17.97±1.58	1 224.33±256.72
>30	P	15.96±0.81	13.70±1.79	2 357.67±408.51

指标分类 indicator classification	评价指标 evaluation index
生产力 productivity	平均胸径(DBH)mean DBH
	平均树高(H)average height
	单位面积蓄积量(V)volume per unit area
林分结构 forest structure	林分密度(SD)stand density
	竞争指数(CI)competition index
	角尺度(UA)uniform angle
	大小比(NC)neighborhood comparison
物种多样性 species diversity	草本Shannon-Wiener指数(H-SW) herb Shannon-Wiener index
物种多样性 species diversity	灌木Shannon-Wiener指数(S-SW) shrub Shannon-Wiener index
土壤质量 soil quality	土壤细菌丰富度(R_B)soil bacterial richness
	土壤真菌丰富度(R_F)soil fungus richness
	有机碳含量(SOC)SOC content
	全氮含量(TN)TN content
	全磷含量(TP)TP content
	全钾含量(TK)TK content
稳定性 stability	森林火险系数(FRC)forest fire risk coefficient
稳定性 stability	林分更新(SR)stand regeneration

指标 indicator	主成分 principal component
指标 indicator	1	2	3	4	5
全氮含量TN	0.926	0.137	0.187	0.155	-0.006
有机碳含量SOC	0.901	0.209	0.174	0.110	-0.017
全磷含量TP	0.893	0.247	0.143	0.112	-0.109
林分密度SD	-0.299	-0.844	0.046	0.160	0.081
平均胸径DBH	0.336	0.835	0.377	0.008	0.015
竞争指数CI	0.004	0.825	0.082	0.037	0.115
角尺度UA	0.245	0.425	-0.421	-0.299	0.021
单位面积蓄积量V	0.112	0.207	0.867	0.127	-0.064
全钾TK	-0.227	0.123	-0.760	-0.030	-0.056
平均树高H	0.381	0.508	0.724	-0.005	-0.016
林分更新SR	-0.012	0.016	-0.048	-0.777	0.209
土壤细菌丰富度R_B	0.495	-0.127	0.133	0.680	0.196
灌木Shannon-Wiener指数S-SW	0.164	-0.008	0.078	0.669	-0.064
土壤真菌丰富度R_F	0.100	0.434	-0.069	0.109	0.657
草本Shannon-Wiener指数H-SW	0.300	0.299	-0.025	0.139	-0.623
大小比NC	-0.125	-0.013	-0.096	0.403	-0.567
森林火险系数FRC	-0.393	0.462	-0.284	-0.075	0.490
方差贡献率/%(VCR)variance contribution rate	31.19	17.34	9.70	7.80	7.43

样地号 plot No.	F	F^*	健康等级 classify	样地号 plot No.	F	F^*	健康等级 classify	样地号 plot No.	F	F^*	健康等级 classify
L1	0.43	0.58	2	L13	-0.01	0.41	3	P7	0.01	0.41	3
L2	0.40	0.57	2	L14	0.43	0.58	2	P8	-0.41	0.24	4
L3	0.58	0.65	2	L15	0.12	0.46	3	P9	-0.04	0.39	3
L4	-0.26	0.31	3	L16	-0.24	0.31	3	P10	-0.81	0.09	4
L5	0.08	0.45	3	L17	0.07	0.44	3	P11	-1.02	0.00	4
L6	0.24	0.51	2	L18	-0.05	0.39	3	P12	0.08	0.44	3
L7	-0.05	0.39	3	P1	-0.07	0.38	3	P13	0.33	0.55	2
L8	-0.48	0.22	4	P2	-0.05	0.39	3	P14	-0.40	0.25	4
L9	-0.35	0.27	4	P3	0.07	0.44	3	P15	-0.68	0.14	4
L10	1.46	1.00	1	P4	-0.29	0.30	3	P16	-0.02	0.40	3
L11	1.33	0.95	1	P5	-0.76	0.11	4	P17	0.02	0.42	3
L12	0.92	0.78	2	P6	-0.45	0.23	4	P18	-0.12	0.36	3

Health assessment of Larix gmelinii var. principis-rupprechtii and Pinus sylvestris var. mongolica plantations in Saihanba Nature Reserve

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