Quantitative Characteristics and Spatial Distribution Pattern of Arbor Species in Coniferous and Broad-Leaved Mixed Forest in Chayu County

doi:10.13466/j.cnki.lyzygl.2022.05.015

Abstract

Abstract:

Spatial distribution pattern is a reflection of the interaction between population and environment,and it is an important means to study the ecological relationship between forest community and environment and species.Taking the coniferous and broad-leaved mixed forest in Cheyingou,Chayu County of southeastern Tibet as the research object,the typical plot method was used to investigate the community,and the diameter structure of the main tree species in the community was analyzed.The time series method was used to predict the population dynamics of each tree,and the point pattern method was used to analyze its spatial distribution pattern and spatial correlation.The results showed that:1)There were three main tree species in the community:Abies chayuensis,Pinus armandii and Betula utilis,and the distribution of the number of each group in the diameter class was generally more than that in the small diameter class.Then,with the increase of the diameter class,the number of the population fluctuated irregularly,indicating that the community was in an unstable state;2)The time series analysis showed that the population numbers of Abies chayuensis,Pinus armandii and Betula utilis in the community would increase in the next 2,4 and 6 years.According to the survey,there were many seedlings in this area,but the renewal was insufficient,and the time series prediction could not consider this ecological process;3)Small trees in all groups were mainly clustered,while the spatial distribution pattern of big trees showed certain diversified characteristics;4)The spatial correlation between big trees and small trees as a whole,and the spatial correlation between various groups of big trees were diversified due to different plots,which were mainly divided into uncorrelated and negatively correlated.

Key words: diameter structure, time series analysis, point pattern analysis, spatial relevance

CLC Number:

S718.54

HUANG Di, REN Yihua, YANG Shouzhi. Quantitative Characteristics and Spatial Distribution Pattern of Arbor Species in Coniferous and Broad-Leaved Mixed Forest in Chayu County[J]. FOREST RESOURCES WANAGEMENT, 2022, 0(5): 118-128.

Figures/Tables 6

Tab.1

Tab.2

Fig.1

Tab.3

Time series prediction of age structure of arbor population

察隅冷杉					华山松					糙皮桦
径级	原始数据	$M 2 (1)$	$M 4 (1)$	$M 6 (1)$	径级	原始数据	$M 2 (1)$	$M 4 (1)$	$M 6 (1)$	径级	原始数据	$M 2 (1)$	$M 4 (1)$	$M 6 (1)$
1	69				1	82				1	43
2	46	58			2	35	59			2	14	29
3	44	45			3	26	31			3	10	12
4	29	37	47		4	22	24	41		4	18	14	21
5	12	21	33		5	8	15	23		5	9	14	13
6	9	11	24	35	6	6	7	16	30	6	2	6	10	16
7	4	7	14	24	7	10	8	12	18	7	1	2	8	9
8	9	7	9	18	8	7	9	8	13
9	7	8	7	12	9	4	6	7	10
10	4	6	6	8	10	10	7	8	8
11	2	3	6	6	11	8	9	7	8
12	2	2	4	5	12	1	5	6	7
13	1	2	2	4	13	1	1	5	5
14	1	1	2	3	14	0	1	3	4
15	0	1	1	2	15	0	0	1	3
16	0	0	1	1	16	1	1	1	2
17	0	0	0	1	17	0	1	0	1
18	0	0	0	0	18	1	1	1	1
19	0	0	0	0
20	0	0	0	0
21	0	0	0	0
22	0	0	0	0
23	0	0	0	0
24	1	1	0	0

Tab.3

Fig.2

Fig.3

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样地号	经度	纬度	海拔/m	坡度/(°)	坡向	郁闭度/%	腐殖质厚度/cm	草本盖度/%
C1	97°27'33.1873″	28°56″44.1241″	3061.79	4	283	75	18.74	55
C2	97°27'35.9778″	28°56″48.1222″	3045.75	21	315	64	18.99	45
C3	97°27'32.2211″	28°56″48.1449″	3071.53	7	286	66	17.13	35

径级	基径/cm	胸径/cm	径级	胸径/cm
1	0.1≤D_j<2	D<10	13	100≤D<110
2	2≤D_j<5	D<10	14	110≤D<120
3	D_j≥5	D<10	15	120≤D<130
4		10≤D<20	16	130≤D<140
5		20≤D<30	17	140≤D<150
6		30≤D<40	18	150≤D<160
7		40≤D<50	19	160≤D<170
8		50≤D<60	20	170≤D<180
9		60≤D<70	21	180≤D<190
10		70≤D<80	22	190≤D<200
11		80≤D<90	23	200≤D<210
12		90≤D<100	24	210≤D<220