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范敏,彭羽,王庆慧,米凯,卿凤婷.景观格局与植物多样性的关系及其空间尺度效应——以浑善达克沙地为例.生态学报,2018,38(7):2450~2461 本文二维码信息
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景观格局与植物多样性的关系及其空间尺度效应——以浑善达克沙地为例
Correlations between landscape pattern and plant diversity at multiple spatial scales: a case study of Hunshandak Sandland
投稿时间:2017-03-23  修订日期:2017-11-12
DOI: 10.5846/stxb201703230507
关键词景观格局  尺度效应  α多样性  β多样性  浑善达克沙地
Key Wordslandscape pattern  scale effect  α diversity  β diversity  Hunshandak Sandland
基金项目中央民族大学"双一流"建设项目(ydzxxk201618);中央民族大学少数民族事业发展协同创新中心项目;大学生科研训练项目(URTP2017110024)
作者单位E-mail
范敏 中央民族大学, 生命与环境科学学院, 北京 100081  
彭羽 中央民族大学, 生命与环境科学学院, 北京 100081 yuu.peng@muc.edu.cn 
王庆慧 中央民族大学, 生命与环境科学学院, 北京 100081  
米凯 中央民族大学, 生命与环境科学学院, 北京 100081  
卿凤婷 中央民族大学, 生命与环境科学学院, 北京 100081  
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摘要:
景观格局是植物多样性的重要影响因素,为了探明沙地景观格局与植物多样性的关系及其空间尺度效应,以浑善达克沙地腹地为研究区,采用样方法进行植物群落学调查,基于GIS和遥感分析技术,分析景观格局指数,计算了10个尺度(100,200,300,400,500,600,700,800,900,1000m)下33个景观格局指数,利用双变量相关性分析法筛选出不同尺度下与植物多样性显著相关的指数;运用逐步回归的方法识别不同尺度下对植物多样性贡献显著的景观格局指数,并进行拟合检验。研究结果表明:景观格局指数对物种多样性影响具有显著的尺度依赖性。在所有空间尺度,景观格局指数主要对Shannon多样性指数和β指数影响较大;在100m尺度下,Shannon指数逐步回归R2值达到最大(0.138);β指数在900m尺度下R2值达到最大值(0.2)。拟合检验发现,在500m尺度下,均匀度指数、Shannon多样性指数和β多样性指数实测值和预测值拟合均达到显著水平(P < 0.05),故认为500m尺度下,景观格局对植物多样性影响较大。因此,在不同尺度下管理和保护沙地植物多样性,应综合考虑景观格局指数的尺度效应,根据需要建立和优化有利于植物多样性的景观格局。
Abstract:
Landscape pattern is one of the important factors affecting plant diversity. However, the effect of landscape pattern in sandy areas remains unclear at various spatial scales. To investigate correlations between landscape pattern and plant diversity, as well as their scale dependence, the present study used field surveys and remote sensing technology to establish plant diversity indices and landscape metrics for the Hunshandak Sandland, northern China. Correlations among alpha diversity, beta diversity, and 33 landscape metrics were screened using bivariate correlation analysis at ten spatial scales (100, 200, 300, 400 500, 600, 700, 800, 900, and 1000m), and significant models were selected by stepwise regression analysis and verified by comparing fitted and field values. We found that landscape metrics influenced plant diversity in a scale-dependent manner The landscape pattern indices had a greater influence on Shannon diversity and β diversity than other diversity indices. The R2 (0.138) of the Shannon diversity by stepwise regression was highest at the 100m scale, whereas the R2 (0.2) of those of β diversity by stepwise regression was highest at the 900m scale. Comparison of the fitted and field values indicated that the Pielou, Shannon, and Whittaker indices were significant at the 500m scale, which confirmed that landscape pattern metrics significantly influence pant diversity at the 500m scale in sandy grassland. This demonstrates the importance of considering the scale effects of landscape pattern during plant diversity conservation and indicates that landscape pattern should be optimized and maintained in order to manage and preserve plant diversity in sandy grassland communities.
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