中国地理科学(英文版) ›› 2009, Vol. 19 ›› Issue (1): 37-45.doi: 10.1007/s11769-009-0037-9

• 论文 • 上一篇    下一篇

Development of a New Index for Integrating Landscape Patterns with Ecological Processes at Watershed Scale

CHEN Liding1, TIAN Huiying1,2, FU Bojie1, ZHAO Xinfeng1,2   

  1. 1. State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;
    2. Graduate University of the Chinese Academy of Sciences, Beijing 100049, China
  • 收稿日期:2008-08-28 修回日期:2008-12-05 出版日期:2009-03-20 发布日期:2010-01-20
  • 通讯作者: CHEN Liding.E-mail:Liding@rcees.ac.cn;Chenliding@sohu.com E-mail:Liding@rcees.ac.cn;Chenliding@sohu.com
  • 基金资助:

    Under the auspices of Chinese Academy of Sciences (No. KZCX2-YW-421);National Natural Science Foundation of China (No. 40621061, 30570319)

Development of a New Index for Integrating Landscape Patterns with Ecological Processes at Watershed Scale

CHEN Liding1, TIAN Huiying1,2, FU Bojie1, ZHAO Xinfeng1,2   

  1. 1. State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;
    2. Graduate University of the Chinese Academy of Sciences, Beijing 100049, China
  • Received:2008-08-28 Revised:2008-12-05 Online:2009-03-20 Published:2010-01-20
  • Supported by:

    Under the auspices of Chinese Academy of Sciences (No. KZCX2-YW-421);National Natural Science Foundation of China (No. 40621061, 30570319)

摘要:

Understanding the relationship between landscape patterns and ecological processes has been a central yet challenging research theme in landscape ecology. Over the past decades,many landscape metrics have been proposed but few directly incorporated ecological processes. In this paper,we developed a landscape index,namely,location-weighted landscape index(LWLI) to highlight the role of landscape type in ecological processes,such as nutrient losses and soil erosion. Within the framework of the Lorenz curve theory,we develop this index by integrating landscape pattern and point-based measurements at a watershed scale. The index can be used to characterize the contribution of landscape pattern to ecological processes(e.g. nutrient losses) with respect to a specific monitoring point in a watershed. Through a case study on nutrient losses in an agricultural area in northeastern China,we found that nutrient losses tended to be higher for a watershed with a higher LWLI value,and vice versa. It implied that LWLI can be used to evaluate the potential risk of nutrient losses or soil erosion by comparing their values across watersheds. In addition,this index can be extended to characterize ecological processes,such as the effect of landscape pattern on wildlife inhabitation and urban heat island effect. Finally,we discuss several problems that should be paid attention to when applying this index to a heterogeneous landscape site.

关键词: landscape pattern, location-weighted landscape index(LWLI), Lorenz curve theory, nutrient loss, surface water quality

Abstract:

Understanding the relationship between landscape patterns and ecological processes has been a central yet challenging research theme in landscape ecology. Over the past decades,many landscape metrics have been proposed but few directly incorporated ecological processes. In this paper,we developed a landscape index,namely,location-weighted landscape index(LWLI) to highlight the role of landscape type in ecological processes,such as nutrient losses and soil erosion. Within the framework of the Lorenz curve theory,we develop this index by integrating landscape pattern and point-based measurements at a watershed scale. The index can be used to characterize the contribution of landscape pattern to ecological processes(e.g. nutrient losses) with respect to a specific monitoring point in a watershed. Through a case study on nutrient losses in an agricultural area in northeastern China,we found that nutrient losses tended to be higher for a watershed with a higher LWLI value,and vice versa. It implied that LWLI can be used to evaluate the potential risk of nutrient losses or soil erosion by comparing their values across watersheds. In addition,this index can be extended to characterize ecological processes,such as the effect of landscape pattern on wildlife inhabitation and urban heat island effect. Finally,we discuss several problems that should be paid attention to when applying this index to a heterogeneous landscape site.

Key words: landscape pattern, location-weighted landscape index(LWLI), Lorenz curve theory, nutrient loss, surface water quality