Community structure and characteristics of plain valley forests in main tributaries of Ertix River Basin, China

doi:10.17521/cjpe.2023.0125

Abstract

Abstract:

The valley forest in the Ertix River Basin is the germplasm bank of Salicaceae species and has important genetic diversity value of Altay, Xinjiang, China. It is of great significance for the protection and utilization of precious resources to study the distribution of plant species and vegetation types under the current human activities such as climate change, hydropower project and grazing. In this study, 80 squares of 20 plots were investigated at 4-8 km intervals in the Burqin River, Haba River and Bilizik River. The constructive species, quantitative characteristics and diameter class structure of the community were analyzed, and the community types were classified. The results showed that: (1) 121 species, 92 genera and 34 families of plants were investigated in the main tributaries of the Ertix River Basin, with a large number of perennial herbaceous plants. (2) Betula pendula and Populus laurifolia were constructive species in the Burjin River and Haba River, while P. alba was constructive species in the Bilizik River. P. nigra, Populus × berolinensis var. jrtyschensis, and P. canescens are associated species, while Salix alba is mainly distributed alone along the riparian edge and rarely mixed with poplar species. (3) The number of individuals of the dominant tree species Betula pendula reached the maximum at the middle altitude of the three tributaries, while the number of individuals of Populus laurifolia was smaller at the middle altitude. (4) The diameter class structure of tree layer species was greatly affected by grazing in summer, and the individuals of large diameter class were the most, and the number of saplings and seedlings were less. (5) The valley forest communities were divided into 6 formations and 34 associations.

Key words: valley forest, Salicaceae, Ertix River Basin, species composition, community type

XUE Zhi-Fang, LIU Tong, WANG Li-Sheng, SONG Ji-Hu, CHEN Hong-Yang, XU Ling, YUAN Ye. Community structure and characteristics of plain valley forests in main tributaries of Ertix River Basin, China[J]. Chin J Plant Ecol, 2024, 48(3): 390-402.

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URL: https://www.plant-ecology.com/EN/10.17521/cjpe.2023.0125

https://www.plant-ecology.com/EN/Y2024/V48/I3/390

Figures/Tables 6

References 25

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河流名称 River name	水体类型 Type of water body	总长 Total length (km)	流域面积 Drainage area (km²)	距出山口长度 Distance from mountain pass (km)
布尔津河 Burqin River	一级支流 Primary tributary	269.6	9 960	42
哈巴河 Haba River	一级支流 Primary tributary	216.3	7 224	40
别列则克河 Bilizik River	一级支流 Primary tributary	155.0	1 600	54

河流名称 River name	水体类型 Type of water body	总长 Total length (km)	流域面积 Drainage area (km²)	距出山口长度 Distance from mountain pass (km)
布尔津河 Burqin River	一级支流 Primary tributary	269.6	9 960	42
哈巴河 Haba River	一级支流 Primary tributary	216.3	7 224	40
别列则克河 Bilizik River	一级支流 Primary tributary	155.0	1 600	54

类别 Category	科数 No. of families	所占比例 Proportion (%)	属数 No. of genera	所占比例 Proportion (%)	种数 No. of species	所占比例 Proportion (%)
双子叶植物 Dicotyledon	26	76.47	68	73.63	89	73.55
单子叶植物 Monocotyledon	6	17.65	22	24.18	28	23.14
裸子植物 Gymnosperm	1	2.94	1	1.10	1	0.83
蕨类植物 Pteridophyte	1	2.94	1	1.10	3	2.48
合计 Total	34	100.00	92	100.00	121	100.00

类别 Category	科数 No. of families	所占比例 Proportion (%)	属数 No. of genera	所占比例 Proportion (%)	种数 No. of species	所占比例 Proportion (%)
双子叶植物 Dicotyledon	26	76.47	68	73.63	89	73.55
单子叶植物 Monocotyledon	6	17.65	22	24.18	28	23.14
裸子植物 Gymnosperm	1	2.94	1	1.10	1	0.83
蕨类植物 Pteridophyte	1	2.94	1	1.10	3	2.48
合计 Total	34	100.00	92	100.00	121	100.00

生活型 Life form	种数 No. of species	所占比例 Proportion (%)
乔木 Tree	10	8.26
灌木 Shrub	14	11.57
一、二年生草本 Annual and biennial herb	25	20.66
多年生草本 Perennial herb	72	59.51
合计 Total	121	100.00