JOURNAL OF NATURAL RESOURCES ›› 2018, Vol. 33 ›› Issue (4): 588-599.doi: 10.11849/zrzyxb.20170065

• Resource Ecology • Previous Articles     Next Articles

Grain Size Effect of Landscape Pattern and Its Response to Land Use Change in the Three Gorges Reservoir Area

CHEN Ya-ru, XIAO Wen-fa, TENG Ming-jun, FENG Yuan   

  1. Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry / Key Laboratory of Forest Ecology and Environment, State Forestry Administration, Beijing 100091, China
  • Received:2017-01-22 Revised:2017-05-04 Online:2018-04-10 Published:2018-04-10
  • Supported by:
    Research Project of National Public Welfare (Meteorology), No. GYHY201406072.

Abstract: Affected by the Three Gorges Reservoir Project, land use/cover in this area dramatically changed during 1992-2012. Based on the land use map in 1992, 2002, 2006 and 2012 (representing important stages of the Project’s construction), we selected a suite of metrics to characterize the grain size effect of landscape pattern within 30-1 000 m grain size range and its dynamic response to land use change. The results reveal: 1) Among the selected 27 metrics, there are 14 metrics showing high sensitivity, 3 metrics showing medium sensitivity, 7 metrics showing low sensitivity and 3 metrics showing insensitivity to the change of grain size. The metrics of different landscape types (except bare land) showed similar trends. 2) The behaviors of the metrics in response to change of grain size can be grouped into five types: monotonous decrease, monotonous increase, staircase increase, no obvious change, and slow increase followed by rapidly decrease. Grain size effect of shape metric showed obvious response to land use change, while the responses of aggregation metric, area-edge metric and diversity index were not affected by the grain size. The optimal grain size for landscape pattern analysis is 30-60 m. 3) Landscape pattern of the Three Gorges Reservoir area became more fragmentary and heterogeneous during 1992-2012. There was a sharp decline and more fragment of cropland while a gradual rise and more connectivity of forest.

Key words: grain size effect, land use change, landscape pattern metrics, Three Gorges Reservoir area

CLC Number: 

  • P901