甘肃敦煌西湖荒漠湿地生态系统优势植物种群分布格局及种间关联性

doi:10.7522/j.issn.1000-694X.2013.00049

摘要/Abstract

摘要：

基于25个样地、375个样方和150条样线的调查资料,采用扩散系数（C）、负二项参数（K）、平均拥挤度（m*）、丛生指标（I）、聚块性指标（PI）、Green指数（GI）、Cassie指标（GA）和Moristia指数（Iδ）等8个指标以及方差比率（VR）法,对甘肃敦煌西湖荒漠-湿地生态系统优势植物种群的空间分布格局、聚集强度和种间总体关联性进行了研究。结果表明:①研究区8种优势种群均为聚集分布(p<0.01)。其中,多枝柽柳群落、多枝柽柳沙包群落和胡杨群落均具有较高聚集程度,而疏叶骆驼刺群落和芦苇群落均具有较低聚集程度。②研究区优势种群中灌（乔）木层均为聚集分布(p<0.05)。③研究区优势种群在各海拔梯度上均为聚集分布(p<0.05)。随海拔梯度的增加,种群聚集强度增加,且种群聚集程度变化较为平缓。④研究区植物群落中,灌（乔）木层主要种群的种间联结表现为显著的正关联,乔灌草和草本层的主要种群的种间联结表现为显著的负关联。应用2×2联列表χ2统计量、联结系数（AC）和共同出现百分率（PC）等方法,综合分析了敦煌西湖主要种群的种间联结显著性和关联强度。结果表明:研究区大多数种群种间关联程度不显著(p>0.05),不关联的种对数明显要多于显著关联种对数,显著负关联的种对数多于正关,说明种群对生境和资源要求不一样,与总体种间相关性检验的方差比率VR值的结果一致,群落中优势物种处于不稳定阶段。

关键词: 敦煌, 优势种群, 空间分布格局, 聚集强度, 种间联结性, 生态系统

Abstract:

Based on the data at 25 sample plots, 375 quadrats and 150 lines transect, with 8 indices including diffusion coefficient (C), negative binomial parameters (K), average crowded degree (m*), index of clumping (I), index of patchiness (PI), Green index (GI), Cassie index (CA) , Moristia index (Iδ) and analysis method of variance percentage (VR), we investigated the spatial distribution pattern, aggregation intensity and the overall correlation among the species of dominant populations in Gansu Dunhuang xihu desert wetland ecosystems. The results showed that: (1) Distributions of the 8 dominant populations were aggregated distribution (p<0.05). Among them, Tamarix ramosissima, Tamarixramosissima sandbagscommunity and Populus euphratica community had higher degree of aggregation, however, the community of Alhagi sparsifolia and Phragmites australis showed an opposite trend. (2) Dominant populations of tree (shrub) layer were aggregated distribution (p<0.05). (3) Dominant populations were all aggregated distribution with the change of elevation (p<0.05). With the raising of elevation, the aggregation intensity of population was increased, but the aggregation degree of population was relatively smooth. (4) The bond among the main species of tree (shrub) layer showed a significant positive correlation, and the bond among the dominant populations of trees, brushes and grasses and herb layer showed significant negative correlation (p<0.05). Meanwhile, the 2×2 contingency table of chi-square statistics, association coefficient (AC), percentage of co-occurrence (PC) and other methods were applied to analyze the correlation and aggregation intensity among the species. The results further showed that correlation among most dominant populations was not significant (p>0.05) in the study area, the population logarithm with no significant (p>0.05) correlation was more than that of population Logarithm with significant correlation, and logarithm with significant negative correlation were more than that of population logarithm with significant positive correlation (p<0.05). This result showed that requirements of populations to habitat and resource were different (p<0.05), and had the same results with variance ratio (VR) by testing of the overall correlation; the dominant species in the community were in unstable stage.

Key words: Dunhuang, dominant population, spatial distribution pattern, aggregation intensity, interspecific association, ecosystem

中图分类号:

Q948.15

张瑾1, 陈文业2, 张继强2, 赵明2, 吴三雄1, 王志广1, 袁海峰1, 窦英杰1, 康建军2, 罗文莉2. 甘肃敦煌西湖荒漠湿地生态系统优势植物种群分布格局及种间关联性[J]. 中国沙漠, 2013, 33(2): 349-357.

ZHANG Jin1, CHEN Wen-ye2, ZHANG Ji-qiang2, ZHAO Ming2, WU San-xiong1, WANG Zhi-guang1, YUAN Hai-feng1, DOU Ying-jie1, KANG Jian-jun2, LUO Wen-li2. Spatial Distribution Pattern and Interspecific Association of the Dominant Populations in Wetland Ecological System Enclosed by Extremely Dry Desert Region in Dunhuang Xihu, Gansu, China[J]. JOURNAL OF DESERT RESEARCH, 2013, 33(2): 349-357.

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