吉林蛟河针阔混交林群落邻体竞争效应

doi:10.11707/j.1001-7488.20220519

Abstract

Abstract:

Objective: The CSR (complete spatial randomness) null model of the point pattern analysis requires that the habitat background is homogeneous, but the most factors in natural forest habitat are heterogeneous, which will inevitably influence the point pattern analysis. This paper attempts to divide the heterogeneous plots into several relatively homogeneous subareas by the method of habitat division, and discusses the interaction rules among individual trees in different habitat subareas through the analysis of mark point pattern, in order to provide theoretical support for the management and operation of forest management. Method: Based on the data of 21.12 hm² natural mixed broadleaved-conifer forest, the forest plot was divided into two relatively homogeneous habitats (A and B) according to the topographic variables. The interaction effects between adjacent individuals were tested by using mark correlation function combined with the complete spatial randomness simulation process. Result: The mark correlation analysis of individual tree species showed that the vast majority of tree species in areas A and B showed negative spatial correlation between individual DBHs. Moreover, at the scale of r < 6 m, the number of tree species with negative correlation in area A was significantly higher than that in area B. At the scale of r < 9 m, no positive correlation between the individual DBHs was detected. Without considering the heterogeneity of habitat conditions, mark correlation analysis was carried out in the whole sample plot. At the scale of 0-8 m, the individual DBHs of canopy layer showed a significant negative correlation, and there was no significant spatial correlation between those of subcanopy layer and understorey layer. When the spatial autocorrelation of the attributes of individual DBHs in each forest layer was tested in a relatively uniform habitat, there was no significant spatial correlation between the individual DBHs of the sub-canopy layer and the understory layer, while those of the canopy layer had significant negative correlation at small scale. The interaction scale of the canopy individuals in area A was 0-6.9 m, and that of area B was 0-5.6 m. Conclusion: Under different habitat conditions (i.e., subzone A and B), the spatial negative correlation scales of DBH of adjacent individuals in the forest canopy are different. Therefore, in the process of forest management, the influence of habitat differences should be fully considered when determining the final stocking density of retained trees.

Key words: spatial distribution patterns, mark correlation function, spatial point pattern, habitat heterogeneity, habitat division, neighborhood competition effect

CLC Number:

S718.5

Jialin Su,Juan Wang,Chunyu Fan,Chunyu Zhang,Xiuhai Zhao. Neighborhood Competition Effect in Mixed Broadleaved-Conifer Forest in Jiaohe, Jilin Province[J]. Scientia Silvae Sinicae, 2022, 58(5): 187-194.

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树种 Tree species	多度 Abundance	胸高断面积 Basal area/(m²·hm^-2)	密度 Density/hm^-2	重要值 Important value(%)
胡桃楸Juglans mandshurica	2 420	5.84	114.58	10.21
色木槭Acer mono	5 073	3.80	240.20	9.43
千金榆Carpinus cordata	8 308	1.20	393.37	7.88
紫椴Tilia amurensis	2 215	2.73	104.88	6.22
春榆Ulmus japonica	2 993	1.35	141.71	4.91
白牛槭A. mandshuricum	3 167	0.97	149.95	4.7
糠椴T. mandshurica	1 741	1.91	82.43	4.45
水曲柳Fraxinus mandshurica	1 084	1.89	51.33	4.26
红松Pinus koraiensis	740	2.15	35.04	4.25
蒙古栎Quercus mongolica	646	1.47	30.59	3.25
裂叶榆U. laciniata	1 366	0.78	64.68	3.13
拧筋槭A. triflorum	1 504	0.54	71.21	2.66
黄檗Phellodendron amurense	796	0.50	37.69	2.43
水榆花楸Sorbus alnifolia	517	0.29	24.48	1.41
其他Other	1 286	1.09	60.88	30.81
合计Total	33 856	26.51	1 603.02	100

项目Item	海拔 Elevation	凹凸度 Convexity	坡度 Slope	坡向 Aspect	样地总胸高断面积 Total basal area in study plot
样地总胸高断面积 Total basal area in study plot	0.4^***	0.3^***	0.5^***	0	1^***
坡向Aspect	0.4^***	0.1	0.1	1^***
坡度Slope	0.4^***	0.2^***	1^***
凹凸度Convexity	0.4^***	1^***
海拔Elevation	1^***

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Neighborhood Competition Effect in Mixed Broadleaved-Conifer Forest in Jiaohe, Jilin Province

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