地理科学进展 ›› 2014, Vol. 33 ›› Issue (12): 1704-1716.doi: 10.11820/dlkxjz.2014.12.014

• • 上一篇    

农田背景下景观结构对半自然生境生物多样性的多尺度影响

王玉婷1,2(), 丁圣彦1,2(), 梁国付1,2   

  1. 1. 教育部黄河中下游数字地理技术重点实验室,河南 开封 475004
    2. 河南大学环境与规划学院,河南 开封 475004
  • 出版日期:2014-12-19 发布日期:2014-12-19
  • 作者简介:

    作者简介:王玉婷(1988-),女,河南安阳人,硕士生,研究方向为景观生态学,E-mail: wytlandscape@163.com。

  • 基金资助:
    国家自然科学基金项目(41071118,41371195)

Multi-scale effects analysis for landscape structure and biodiversity of semi-natural habitats and cropland in a typical agricultural landscape

Yuting WANG1,2(), Shengyan DING1,2(), Guofu LIANG1,2   

  1. 1. Key Laboratory of Geospatial Technology for the Middle and Lower Yellow River Regions, Ministry of Education, Kaifeng 475004, Henan, China
    2. College of Environment and Planning, Henan University, Kaifeng, 475004, Henan, China
  • Online:2014-12-19 Published:2014-12-19

摘要:

以黄河下游典型农区封丘县为研究区,调查比较了农业景观中半自然生境(包括人工林、树篱和沟渠)与农田生境中植物和地表节肢动物的物种多样性,并应用广义线性模型(GLM)从不同的空间尺度分析半自然生境和农田中的物种多样性与景观变量之间的关系。结果表明:①林地植物多样性最高,且以人工林和沟渠中的植物物种相似度最高;各半自然生境中地表节肢动物的多度和物种丰富度明显高于农田,且以人工林和树篱间地表节肢动物的相似度最高。②在250 m景观范围内的景观变量能更好地解释植物多样性和地表节肢动物多样性,而树篱和沟渠在400 m景观范围上地表节肢动物的尺度效应最显著。③在250 m尺度上植物多样性与景观变量的拟合方面,在人工林和树篱生境中,散布与并列指数(IJI)和植物丰富度呈显著负相关;人工林中IJI和周长面积比(PARA_MD)对植物香农多样性指数呈负相关;在树篱中,边缘密度(ED)、聚集度指数(AI)与植物香农多样性指数负相关显著,欧几里得最近距离(ENN_MN)与均匀度指数正相关;在沟渠中,ED、AI与植物丰富度显著负相关。④地表节肢动物与景观变量的拟合显示,在250 m景观范围上,人工林生境主要体现在多度与香农多样性指数(SHDI)和土地利用丰富度的负相关,而农田中则是多度与SHDI呈显著负相关,与ED、PARA_MD、AI和土地利用丰富度(LUR)呈显著正相关;在400 m景观范围上,树篱中,IJI与地表节肢动物的多度和丰富度呈显著正相关;沟渠生境中,只有多度与IJI和土地利用丰富度显著负相关,与SHDI显著正相关。

关键词: 生物多样性, 半自然生境, 多尺度, 农田背景

Abstract:

The extensive planting of single crop for extended time periods in agricultural landscapes has led to a decrease in species diversity. Natural and semi-natural habitats within agricultural landscapes, as well as the associated plant and small animal (especially ground arthropod) communities, are of vital importance for preserving biodiversity in agro-ecosystems. It is crucial to study the relationship of regional agricultural landscape heterogeneity and biodiversity for maintaining ecosystem services and stability. In this study, Fengqiu County of Henan Province, a typical agricultural region in the lower reaches of the Yellow River, was taken as the study area for investigating the diversity of semi-natural habitat plants in agricultural landscape and ground arthropods in comparison to cropland of this agricultural ecosystem. The analysis of the relationship between plant diversity in semi-natural habitat and landscape variables was repeated for four different spatial scales (100 m, 250 m, 400 m, 550 m) and for artificial forest, hedgerow, and ditch environments to determine the optimal spatial scale of analysis for plant diversity in agricultural landscape. The relationship between ground arthropods diversity and semi-natural habitat variables was also analyzed at the local habitat scale. All analyses were conducted using generalized linear models (GLM) in R statistical software. The results show that: (1) Plant diversity was highest in artificial forest. The abundance and species richness of ground arthropods in semi-natural habitats were significantly higher than that in farmland; (2) The relationships between richness of plant species and diversity in semi-natural small habitat and landscape heterogeneity were strongest at a spatial scale up to 250 m radius around the sampling point. But the relationship between ground arthropod species and diversity in semi-natural small habitat and landscape heterogeneity was strongest at a spatial scale up to 250 m radius around sampling points in artificial forest and cropland; (3) Results of GLM regression on plant species diversity and landscape variables at the scale up to 250 m radius around sampling points confirmed that vegetation richness (Sveg) was negatively correlated to interspersion and juxtaposition index (IJI) in artificial forest and hedgerows; In ditches, vegetation richness (Sveg) had a negative effect on edge density (ED) and aggregation index (AI) but a positive effect on Shannon's diversity (SHDI); (4) Results of GLM regression on ground arthropod species diversity and landscape variables confirmed that at the range of 250 m radius around sampling points, abundance was negatively related to Shannon's diversity (SHDI) and land use richness, and was only significantly negatively related to Shannon's diversity (SHDI) in cropland fields. Generally speaking, the semi-natural habitat elements in intensively farmed agricultural landscapes may function as refugia and sources of dispersal or stepping stone habitats. It will play an increasingly important role in regional biodiversity conservation and improvement by connecting these scattered semi-natural habitat elements in agricultural landscape into networks. However, attributes of semi-natural habitats, such as area, quantity, type, and spatial distribution, are among the important research topics in urgent need of study and consideration.

Key words: biodiversity, semi-natural habitat, multi-scale effect, agricultural landscape

中图分类号: 

  • Q14