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Shenyang Agricultural University (2020)

Effects of Landcape Patterns of Sloping Land in the Small Watersheds on Topsoil Soil Animals of the Semi-arid Region in the West of Liaoning Province

林琳;

Titre : Effects of Landcape Patterns of Sloping Land in the Small Watersheds on Topsoil Soil Animals of the Semi-arid Region in the West of Liaoning Province

Auteur : 林琳;

Grade : Master’s Theses 2020

Université : Shenyang Agricultural University

Résumé
In the process of using semi-arid slopes,affected by policies and management,different types of utilization combinations have been formed,which have resulted in different landscape patterns.Soil animals,as consumers and decomposers that maintain energy flow and material circulation in the ecosystem,have a positive role in promoting the stability of the ecosystem.Stability of farmland ecosystems depends on the heterogeneity of its landscape structure.Highly heterogeneous landscapes can not only increase the connectivity of soil animal habitats,but also provide a carrier for its energy transport.Interference factors of slope farmland ecosystem are more complex,and land use types cannot fully reflect the differences of local habitats of soil animals,which make it necessary to study the impact of regional landscape patterns on soil animal diversity.In view of the above,this study takes the sloping land of the semi-arid small watershed in western Liaoning as the research area,and uses 3S technology and landscape index analysis method to analyze the landscape heterogeneity of different types of landscape combinations on the slopes in the region ;and uses the trap method to obtain the data of the surface soil animals in each sample area ;uses Pearson correlation analysis and multiple linear regression to analyze the relationship between the topsoil soil animal community feature index and landscape index,and then explores the impact of different landscape patterns on topsoil soil animals in semi-arid slope areas.The conclusions of the study are as follows:1.The overall landscape fragmentation degree of slope land in small watershed is relatively high.The landscape pattern differences among different landscape types are obvious.According to different land use types and their combinations,seven typical landscape combination are selected in this study area 20 samples,including type 1(orchard and terrace compound),2(orchard and slope farmland compound),type 3(forest land and slope farmland compound),type 4(forest land + orchard and slope farmland compound),type 5(forest land + terrace non-composite),type 6(forest land + slope farmland non-complex)and type 7(orchard + terrace non-complex).Due to the high precision of landscape refinement,the maximum PD value in the sample area at the landscape level reached 3933.078,the maximum LPI value was.143,and the maximum CONTAG value was 65.813.At the level of type,the patch density of farmland ridge is the highest,the degree of accumulation and dominance of farmland is the highest,and the shape of rural road is the most complex

Mots clés : Topsoil soil animals; Landscape index; Landscape combination type; Slope field; Semi-arid region in the west of Liaoning Province;

Présentation (CNKI)

Page publiée le 16 octobre 2020