Informations et ressources scientifiques
sur le développement des zones arides et semi-arides

Accueil du site → Master → Chine → 2022 → Construction of County Ecological Security Pattern in Semi-arid Area ——A Case Study of Lintao County

Lanzhou University (2022)

Construction of County Ecological Security Pattern in Semi-arid Area ——A Case Study of Lintao County

朱陇强

Titre : Construction of County Ecological Security Pattern in Semi-arid Area ——A Case Study of Lintao County

Auteur : 朱陇强

Grade : Master 2022

Université : Lanzhou University

Résumé partiel
Since the 20th century,the level of industrialization and urbanization has been continuously improved with the development of productivity,the resulting high-intensity land development has increasingly intensified the contradiction between people and natural ecological environment,soil erosion,soil pollution,land desertification,grassland,forest degradation and a series of ecological problems gradually highlights,directly or indirectly influences the regional ecological security and sustainable development.And it is of great significance to construct and strengthen ecological security pattern in semi-arid areas and identify important ecological components to maintain regional ecological security and stability and curb the trend of ecological environment degradation,it’s also effectively to resolve the conflict between ecological protection and economic development,thus ensuring ecological security and sustainable development in semi-arid regions.This paper took Lintao County,Dingxi City,Gansu Province,a county-level administrative unit in the inland semi-arid area of Northwest China,as the research area.As a regional ecological security pattern according to its first demonstration area construction and ecological civilization construction goal request,the clear ecological system on the basis of composition and spatial distribution,12 landscape pattern indices were selected from the patch type and landscape level to systematically analyze the characteristics of the landscape pattern in the study area,and quantitatively evaluated the ecological environment quality,ecosystem service function,and ecological sensitivity of the study area.The ecological source area was identified based on the MCR model and each ecological component was identified,and the ecological security pattern of the study area was constructed,in order to provide reference for the construction of the ecological security pattern at the county scale in semi-arid areas.The main conclusions are as follows :(1)There were significant differences in landscape characteristics among different types of land use in Lintao County,and there were significant differences in landscape characteristics among different types of land use in Lintao County.The ecosystem in the study area is mainly farmland and grassland,accounting for nearly 80%of the county area.The ecosystem is relatively single and greatly affected by human activities,so the ecosystem is very fragile.In terms of landscape characteristics,the fragmentation degree of each patch in the study area is large and the number of patches is large,but each patch has neither central tendency nor dispersed tendency,and is in a relatively balanced state.Among them,the construction land had the largest number of patches(47,974)and the largest patch density(up to 16.80),while the cultivated land had the largest patch area(141333.9 hm 2)and the largest patch area(the maximum patch area ratio was 25.3716),and the edge density reached 110.1161.The sprawl index was the highest in Lanzhou Military Racecourse,which was 74.5007.Longmen Town has the largest landscape shape index,which is 59.775.The highest diversity index and evenness index were found in Taoyang Town.The highest aggregation index is Lanzhou Junmachang,as high as 94.672.(2)The results of ecological quality assessment showed that there were significant spatial heterogeneity in all ecological indexes of Lintao County,and the ecological sources of Lintao County were mainly distributed in the valley and the southern part of the study area.

Mots clés : Ecological sources ;Ecological security pattern ;MCR model ;Lintao County ;

Présentation (CNKI)

Page publiée le 30 octobre 2022