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Northwest A&F University (2022)

Soil Eco-hydrological Effects of Different Vegetation Restoration Patterns in the Loess Hilly Region


Titre : Soil Eco-hydrological Effects of Different Vegetation Restoration Patterns in the Loess Hilly Region

Auteur : 许小明

Grade : Doctoral Dissertation 2022

Université : Northwest A&F University

Résumé partiel
Severe soil erosion on the Loess Plateau has caused problems such as soil quality degradation and ecological security.Vegetation restoration is the most important measure to curb soil erosion and reduce sediment transportation by the Yellow River in the Loess Plateau region.Large-scale measures of returning farmland to forests and grasslands have promoted regional ecological restoration,and soil erosion has generally been curbed.Different vegetation restoration methods have different effects.Assessing the environmental effects of degraded ecosystems restoration can reveal the efficacy of ecological restoration in fragile areas in terms of increasing species diversity,changing community structure,improving soil properties,increasing soil infiltration,enhancing soil reservoir capacity and heightening ecosystem carbon sequestration,which can serve as a valuable foundation and restoration patterns reference for soil and water conservation,woodland and grassland management,and scientific management of ecosystem carbon pools in the Loess Plateau.This study addresses the new pattern of vegetation restoration and ecological environment changes on the Loess Plateau,and takes the Loess Hilly Region of Beiluo River Basin as the study area,where land use and eco-hydrological processes have undergone significant changes.Through field sample survey,sample collection,indoor experiments and data analysis,this paper aims to provide an in-depth analysis and understanding on the effects of artificial restoration and natural succession restoration on the structural characteristics of vegetation communities and their hydrological functions,soil hydro-physical properties,infiltration performance and regional differences from the perspectives of soil and water conservation and soil eco-hydrological effects.This paper hopes to elucidate the ecosystem carbon sequestration functions of different vegetation restoration patterns and to reveal the reasons for the runoff reduction from the perspective of the impact of vegetation restoration on soil eco-hydrological processes.Finally,based on the analysis of land use change characteristics in different periods,this study completed the transformation of the vegetation-soil effects from the sample plot scale to the watershed scale,and clarified the spatial and temporal change in soil hydro-physical properties and infiltration performance under the influence of vegetation restoration.The main conclusions obtained from this study are as follows :(1)Compared with the slope cropland,artificial and natural vegetation restoration in the Loess Hilly Region has increased the number of plant species,improved plant diversity and enhanced the vertical structure complexity of community.The Compositae,Rosaceae and Gramineae families are the most abundant in the five typical artificially restored vegetation types of grassland,Hippophae rhamnoides Linn.,Caragana korshinskii Kom,Robinia pseudoacacia L.and Populus simonii Carr and the eight natural succession stages of slope cropland,abandoned cropland for 10 years,abandoned cropland for 20 years,Sophora davidii(Franch.)Skeels.,Betula platyphylla Suk.,Pinus tabulaeformis Carr.,Quercus wutaishanica-Pinus tabulaeformis mixed forests and Quercus wutaishanic Mary.Vegetation restoration has not only increased the number of species,but also enhanced the plant diversity.The Margalef index,Shannon-Wiener index,Pielou index and Simpson index of the artificially restored vegetation were 30.08%,58.56%,40.12%and4.35%smaller than those of the natural succession restored vegetation,respectively.During natural succession,the species diversity indices showed a rapid increase followed by a fluctuant decrease until stabilization,which was consistent with the hypothesis of the medium-term species richness

Mots clés : Loess Hilly Region ;Artificial restoration ;Natural succession restoration ;Soil eco-hydrological effects ;Regional characteristics ;

Présentation (CNKI)

Page publiée le 18 octobre 2022