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甘肃敦煌西湖湿地芦苇盐化草甸植物群落生态位特征研究.(PDF)

《南京林业大学学报(自然科学版)》[ISSN:1000-2006/CN:32-1161/S]

Issue:
2019年02期
Page:
191-196
Column:
研究简报
publishdate:
2019-03-30

Article Info:/Info

Title:
Niche characteristics of a salinized Phragmites communis meadow in a wetland of West Lake, Dunhuang, Gansu Province
Article ID:
1000-2006(2019)02-0191-06
Author(s):
ZHANG Jiqiang12CHEN Wenye12*TAN Yanrong12LIU Donghao12 YUAN Haifeng3 WANG Binjie12LIU Hongyuan1CHEN Xu3
(1.Gansu Research Academy of Forestry Science and Technology, Lanzhou 730020, China; 2. Gansu Dunhuang Xihu Wetland Ecosystem Research Station, Dunhuang 736200, China; 3. Administrative Bureau of Gansu Dunhuang Xihu National Nature Reserve, Dunhuang 736200, China)
Keywords:
West Lake Wetland Dunhuang Gansu Province salinized Phragmites communis meadow population importance value niche breadth niche overlap
Classification number :
Q948.15; S718
DOI:
10.3969/j.issn.1000-2006.201803020
Document Code:
A
Abstract:
【Objective】 A wetland with a large reed area exists in West Lake, Dunhuang, Gansu Province in the extremely arid region of Northwest China; however, artificial and natural interference have caused environmental conditions to decline in this region. The aim of this study is to understand the niche characteristics of the plant community and its succession trends in the degraded saline reed meadow, as this will provide important information for the restoration and management of salinized Phragmites communis.【Method】A field investigation was conducted in West Lake, Dunhuang in early September 2017. The center of the field was in the lowest region of Yanchiwan(elevation 997 m). Two sample belts were placed at right angles to each other in west-east and south-north directions. Five fixed plots(30 m ×30 m)were positioned in each sample belt and plots were 100 m apart. Five small plots(5 m×5 m)were randomly selected along two diagonals in the sample plot. Plant species, height, abundance, coverage, and density were recorded in 50 small plots. Niche characteristics of the reed salt meadow were examined using Levins niche breadth index and Panika niche overlap index based on the results of the field investigation.【Result】Nine species of plants(belonging to six families and nine genera)occurred in 10 plots, including super-xerophytic, halophytic, sandy, wet and aquatic plants. Phragmites communis was the dominant species in the salinized meadow community, and its spatial distribution was characterized by the coexistence and transition between desert and wetland types. The niche breadth order was: Phragmites communis (0.350), Alhagi sparsifolia (0.263), Carex orbicularis(0.185), Glycyrrhiza inflate(0.184), Leymus secalinus (0.184), Salsola collina (0.145), Apocynum venetum (0.117), Lycium ruthenicum (0.115), and Glaux maritima (0.059). Niche overlap(Okj)ranged from 0.505 to 0.995. The Okj of 19 pairs of populations were greater than 0.7, 15 pairs were greater than 0.8, and 9 pairs were greater than 0.9, accounting for 53%, 42% and 25% of the total, respectively. Overall, there was a high level of niche overlap among species. Results show that there was high similarity in resource utilization among plant populations in the reed saline meadow in Dunhuang West Lake.【Conclusion】The reed saline meadow community in Dunhuang West Lake consisted of desert vegetation and wetland vegetation, and its spatial distribution was characterized by the coexistence and transition between desert and wetland types. The maximum niche overlap index of reed saline meadow was accompanied by the maximum niche width between dominant species. Otherwise, niche differentiation between groups was not obvious. In particular, strong competition was observed between Phragmites communis and Alhagi sparsifolia, indicating that if environmental conditions decline and groundwater levels decrease, the saline meadow that is currently dominated by Phragmites communis will be succeeded by desert vegetation(primarily Alhagi sparsifolia).

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Last Update: 2019-03-30