Study on Distribution Characteristics and Population Dynamics of Wild Cycas Hainanensis in Hainan Island

doi:10.13466/j.cnki.lyzygl.2021.04.017

Abstract

Abstract:

In order to recognize the distribution characteristics and population dynamics of Cycas Hainanensis resources in Hainan,a general investigation of wild Cycas Hainanensis was conducted in 56 sites and 62 quadrats in Hainan Island.The geographical distribution,population characteristics,population distribution pattern and the influence environmental factors of wild Cycas Hainanensis population were studied.The results showed that: 1) the investigated regional distribution of Cycas hainanensis mainly included Wuzhishan city,Baoting county and Qiongzhong county etc in central and southern mountain cities and counties,and the southeast mountain areas of Changjiang county;2) Cycas Hainanensis was mainly distributed in tropical rainforests with a medium and high elevation range of 400~800m,slope range for the semi-sunny,semi-shady slope area,and a medium and higher canopy density range of 40%~60%,the terrain was flat,usually in moist biotopes such as under story and the bush of forest edge,and the ravine side;3) The Cycas Hainanensis population structure was stable,as the young trees and small trees were in the majority,and the big trees were fewer,and seedlings were the least,its renewal ability was not strong;4) It was indicated by the stationary life table that the population mortality was increasing with age,the survival curve of Cycas Hainanensis population closed to Deevey-Ⅰ type;5) The population distribution had a tendency to uniform distribution.

Key words: Hainan Island, Cacys hainanensis, population characteristics, geographical distribution, distribution characteristics

CLC Number:

S718.54

WU Erhuan, LI Donghai, YANG Xiaobo, ZUO Yongling, YANG Ning. Study on Distribution Characteristics and Population Dynamics of Wild Cycas Hainanensis in Hainan Island[J]. FOREST RESOURCES WANAGEMENT, 2021, (4): 130-137.

Figures/Tables 6

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x	a_x	L_x	d_x	q_x	T_x	e_x	lgL_x
Ⅰ	7	49	-84	-12	385	55	1.69
Ⅱ	91	132.5	-83	-0.91	378	4.15	2.12
Ⅲ	174	113.5	121	0.7	287	1.65	2.05
Ⅳ	53	38.5	19	0.36	113	2.13	1.59
Ⅴ	24	30	-12	-0.5	60	2.5	1.48
Ⅵ	36	18	36	1	36	1	1.26

市县	方差	DI	t值	K	I	m^*	PAI	Ca	I^&	GI	SD
保亭	0.81	0.51	1.32	-4.22	-0.49	1.09	0.69	-0.24	0.70	-0.16	E
三亚	93.07	8.27	13.72	2.54	7.27	18.52	1.65	0.39	1.57	11.55	C
万宁	8.70	2.78	3.36	1.49	1.78	4.91	1.57	0.67	1.52	0.65	C
五指山	122.21	23.96	69.58	1.21	22.96	28.06	5.50	0.82	5.31	6.45	C