基于激光雷达数据的塔里木河下游胡杨种群空间分布格局和种内竞争关系

doi:10.11707/j.1001-7488.LYKX20220586

Abstract

Abstract:

Objective: This study aims to analyze the spatial distribution pattern and intraspecific competition intensity variation of Populus euphratica tree populations under different groundwater depth levels in arid regions, and explore the response characteristics of population spatial structure to the arid environmental condition. Method: Fifteen plots of 50 m × 50 m in a natural P. euphratica forest were set up at equal distances within a range of 1 000 m away from the river channel at three cross-sections in the lower reaches of the Tarim River. The terrestrial laser scanning (TLS) technique was used to acquire the three-dimensional structural parameters of trees in the plots. The spatial distribution indicators such as aggregation index (R), David-moor clustering index (I), point pattern function g(r), and competition index (CI) were used to analyze the spatial distribution pattern and intraspecific competition intensity. Result: 1) The R and I indices indicated that P. euphratica population structure mainly showed aggregated patterns at the different groundwater levels in the study area. 2) The analysis of the g(r) function values obtained from the radius (r) distance of 0–25 m away from a tree in various plots showed that most of the plots exhibited an aggregated distribution pattern within r < 5 m distance, and changed to random distribution pattern with r > 5 m. With the increase in groundwater depth, the tree's aggregation distance r will decreased. 3) The analysis results of the point pattern function g₁₂(r) indicated that there were differences in their distribution patterns among different age-class trees. Middle-aged trees mainly showed an aggregated pattern, while other age-class trees showed a random distribution pattern. There was a positive correlation between middle-aged trees and young or mature trees, showing a mutually promoting relationship, while trees of other age classes did not show significant correlations. 4) The average CI index showed a decreasing trend with the increase of distance from the river channel, and the individual tree CI decreased with the increase of DBH. Conclusion: P. euphratica population in the lower reaches of the Tarim River shows an aggregated distribution pattern at small observation scales and however exhibits to a random distribution pattern characteristics with the increase of scale. As the distance from the river increases and the groundwater level gradually decreases, the stand density decreases and the average competition intensity within the species weakens, resulting in a declining trend of trees.

Key words: Populus euphratica, terrestrial laser scanning, spatial distribution pattern, intraspecific association, competitive intensity

CLC Number:

Q145

Yusup Asadilla,Halik Ümüt,Dilixiati Babierjiang,Cheng Lei,Jianxin Wei,Abliz Abdulla,Jianluo Cui,Xixiang He. Spatial Distribution Pattern and Intraspecific Competition of Populus euphratica Population in the Lower Reaches of the Tarim River Based on LiDAR Data[J]. Scientia Silvae Sinicae, 2024, 60(4): 31-39.

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References 0

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河段 River section	样地 Plot	株数 Trees	聚集指数 Aggregation index	z值 z-value	格局类型 Distribution pattern	丛生指数 Cluster index	t值 t-value	格局类型 Distribution pattern
英苏 Yingsu	A1	83	1.23	4.09^**	U	1.80	1.65	A
	A2	54	0.98	?0.27	R	2.20	2.24^*	A
	A3	78	0.89	?1.72	A	1.70	1.52	A
	A4	46	1.03	0.46	R	1.40	0.69	A
	A5	22	1.19	1.78	R	1.40	0.59	A
阿拉干 Arghan	B1	100	1.00	0.04	R	3.14	4.77^**	A
	B2	73	0.56	?7.03^**	A	2.27	2.62^*	A
	B3	76	0.94	?0.89	R	1.09	0.19	R
	B4	66	0.94	0.84	R	1.75	1.51	A
	B5	44	0.87	?1.64	R	2.01	1.83^*	A
依干布吉玛 Iganbujima	C1	110	0.93	?1.27	R	3.00	3.45^**	A
	C2	48	0.51	?6.30^**	A	4.00	4.93^**	A
	C3	33	0.88	?1.25	R	1.00	0.43	R
	C4	31	0.60	?4.19^**	A	3.00	2.86^**	A
	C5	18	0.55	?4.62^**	A	1.20	2.45^*	A

样地 Plots	幼龄树 Young trees			中龄树 Middle age trees			成熟龄树 Mature trees			老龄树 Old trees
样地 Plots	比例 Ratio (%)	g(r)	格局 Pattern	比例 Ratio (%)	g(r)	格局 Pattern	比例 Ratio (%)	g(r)	格局 Pattern	比例 Ratio (%)	g(r)	格局 Pattern
A1	11	8.5	A	30	2.2	R	38	2.1	R	21	3.3	R
A2	20	6.3	R	26	3.1	R	13	3.4	R	12	5.4	R
A3	23	2.5	R	63	4.8	A	11	4.6	R	3	—	—
A4	24	4.8	R	41	4.9	R	26	2.5	R	9	0.4	R
A5	14	17.4	R	23	16.7	R	32	7.8	R	32	2.7	R
B1	26	2.8	R	58	3.5	A	14	2.4	R	2	10.6	R
B2	5	27.9	R	70	10.1	A	19	8.4	R	5	14.1	R
B3	16	4.8	R	55	3.8	A	22	3.6	R	7	8.2	R
B4	13	3.7	R	68	3.2	R	18	4.8	R	1	—	—
B5	32	3.8	R	18	26.3	R	23	2.6	R	27	4.8	R
C1	43	2.1	R	45	2.6	A	5	4.9	R	6	8	R
C2	9	54.2	A	34	9.2	A	55	9.5	A	2	—	—
C3	9	11.1	R	45	3.4	R	18	3.7	R	27	1.6	R
C4	10	22.3	R	35	7.8	R	23	16.1	R	32	8.6	A
C5	6	18.2	R	42	4.5	A	26	11.7	R	26	1.7	R

样地 Plots	幼龄-中龄 Young-Middle		幼龄-成熟龄 Young-Mature		幼龄-老龄 Young-Old		中龄-成熟龄 Middle-Matures		中龄-老龄 Middle-Old		成熟龄-老龄 Mature- Old
样地 Plots	g₁₂(r)	关联性 Association	g₁₂(r)	关联性 Association	g₁₂(r)	关联性 Association	g₁₂(r)	关联性 Association	g₁₂(r)	关联性 Association	g₁₂(r)	关联性 Association
A1	3.9	+	1.5	?	3.4	?	1.8	?	1.5	?	1.8	?
A2	3.5	?	5.6	?	2.7	?	9.5	+	2.9	?	1.9	?
A3	2.7	?	2.1	?	?	?	2.2	?	?	?	?	?
A4	1.9	?	2.3	?	0.2	?	4.1	+	4.2	?	3.2	?
A5	3.2	?	6.5	+	3.6	?	8.1	+	4.1	?	5.6	?
B1	3.1	+	1.7	?	2.5	?	1.8	?	2.8	?	3.5	?
B2	9.2	+	11.6	+	0.1	?	2.5	?	7.8	?	2.4	?
B3	1.4	?	3.2	?	2.8	?	2.1	?	1.6	?	1.9	?
B4	3.5	?	5.8	?	?	?	3.6	+	?	?	?	?
B5	3.1	?	5.5	?	3.4	?	3.8	?	7.5	?	4.6	?
C1	1.6	?	1.1	?	0.9	?	2.5	?	1.9	?	?	?
C2	6.3	+	2.6	?	?	?	6.8	+	?	?	?	?
C3	2.8	?	2.6	?	4.4	?	3.2	?	1.2	?	2.7	?
C4	5.8	?	5.9	?	1.1	?	3.9	+	2.8	?	4.2	?
C5	4.2	?	3.5	?	2.6	?	3.4	?	6.5	?	3.4	?

样地 Plots	A1	A2	A3	A4	A5
CI	0.034	0.031	0.028	0.016	0.010
样地 Plots	B1	B2	B3	B4	B5
CI	0.053	0.036	0.026	0.1081	0.030
样地 Plots	C1	C2	C3	C4	C5
CI	0.042	0.023	0.006	0.014	0.008

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Spatial Distribution Pattern and Intraspecific Competition of Populus euphratica Population in the Lower Reaches of the Tarim River Based on LiDAR Data

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