三峡库区香溪河消落带植被群落特征与土壤环境相关性

生态学杂志

三峡库区香溪河消落带植被群落特征与土壤环境相关性

徐建霞^1,2,王建柱^1*

(¹三峡库区生态环境教育部工程研究中心，三峡大学，湖北宜昌 443002；²贵州省农业科学院旱粮研究所，贵阳 550006)

出版日期:2018-12-10 发布日期:2018-12-10

Correlation between vegetation community and soil physical-chemical factors in waterlevel fluctuation zone of Xiangxi River of the Three Gorges Reservoir area.

XU Jian-xia^1,2, WANG Jian-zhu^1*

(¹Engineering Research Center of Ecoenvironment in the Three Gorges Reservoir Region, Ministry of Education, China Three Gorges University, Yichang 443002, Hubei, China; ²Upland Crops Institute, Guizhou Academy of Agricultural Sciences, Guiyang 550006, China).

Online:2018-12-10 Published:2018-12-10

摘要/Abstract

摘要： 土壤环境是影响植被群落结构的关键因素。为揭示三峡库区消落带植被群落的空间分布与土壤环境间的相关规律，本文运用聚类分析法分析了三峡库区香溪河消落带调查的30个样带群落属性，并利用冗余分析（RDA）分析了11个土壤理化因子与消落带植被空间分布及多样性的相关关系。聚类分析结果显示，香溪河消落带草本群落可划分为7种类型，其中一年生植物群落占据优势；RDA排序轴与环境因子的相关性分析显示，RDA第1排序轴与土壤含水量（SWC）呈显著正相关，与消落带高程（Ele）呈极显著负相关（P<0.01）；第二轴主要与pH、Fe-P、土壤有机质（SOM）和O-P呈负相关（P<0.05）。植被多样性指数与土壤理化因子的相关性分析表明，物种丰富度指数（R）与Ele、pH和SOM相关关系最为显著；优势度指数（D）与Ele呈极显著负相关（P<0.01），而与SWC呈显著性正相关；香农多样性指数（H）与Ele、SOM、TP呈显著正相关，与SWC、pH呈显著性负相关；物种均匀度指数（E）除与Ele和SWC存在显著相关性外，均与其他环境因子间不存在显著性（P>0.05）。综上，消落带高程、土壤含水量、土壤有机质、土壤pH及土壤TP和无机磷中O-P和Fe-P是影响香溪河消落带植被群落格局的主要因素。

关键词: 异质生境, 羊草, 潜在种群, 苗, 营养繁殖, 芽

Abstract: Soil environment is a key factor affecting plant community structure. To address the relationship between spatial distribution of plant community and soil environmental factors in water-level fluctuation zone (WLFZ) of the Three Gorges Reservoir area, plant community characters of 30 sampling transects in the WLFZ of Xiangxi River were analyzed using cluster analysis. Redundancy analysis (RDA) was used to examine the roles of 11 soil physicochemical factors in driving the spatial distribution and diversity of vegetation. Clustering analysis showed that the herbaceous communities could be grouped into seven types in the Xiangxi River riparian zone dominated by annual plant communities. Results from correlation analysis of RDA and environmental factors revealed that the first axis of RDA was significantly correlated with soil water content (SWC), and significantly negatively correlated with elevation (P<0.01). The second axis was negatively related to soil pH, iron-bound phosphorus (Fe-P), soil organic matter (SOM) and organic/ortho P (O-P) (P<0.05). Correlation analysis between vegetation diversity index and soil physical-chemical properties revealed that there were significant correlations between species richness (R) and elevation, soil pH as well as SOM. Plant dominance index (D) was significantly negatively correlated with elevation (P<0.01), but significantly positively correlated with SWC. Shannon diversity index (H) was significantly positively correlated with elevation, SOM and total P (TP), but significantly negatively correlated with SWC and pH. There were no significant relationships between species evenness index (E) and other environmental factors except for elevation and SWC (P<0.05). Our results indicated that the main factors affecting the vegetation distribution in the WLFZ of Xiangxi River included elevation, SWC, SOM, soil pH, soil TP, and inorganic phosphorus (O-P and Fe-P).

Key words: heterogeneous habitat, vegetative reproduction, bud, juvenile tiller, Leymus chinensis, potential population

徐建霞,王建柱. 三峡库区香溪河消落带植被群落特征与土壤环境相关性[J]. 生态学杂志.

XU Jian-xia, WANG Jian-zhu. Correlation between vegetation community and soil physical-chemical factors in waterlevel fluctuation zone of Xiangxi River of the Three Gorges Reservoir area.[J]. cje.

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