Study On The Relationship Between Vegetation And Soil Physical And Chemical Properties Of Typical Eroded Gully In Yuanmou Dry-hot Valley Region

Soil is an important factor for the growth and development of vegetation,and vegetation is an indispensable part of ecological restoration and soil and water conservation.In Yuanmou dry-hot valley,typical erosion gully vegetation has obvious differences in dry and wet seasons,and soil properties are an important factor affecting vegetation growth and development,especially in the alternate dry and wet seasons.In order to explore the relationship between vegetation and soil properties of typical eroded ditch in dry and hot valleys,this study used field measurements and laboratory analysis to obtain the vegetation characteristics of typical eroded ditch in dry and wet seasons in the area and the corresponding soil physical and chemical properties.Relevant data analysis methods explore the relationship between the two,in order to provide useful guidance for local conditions and time to adopt ecological restoration methods for erosion gully restoration and governance The main research results are as follows:(1)From the overall point of view of the study area,the vegetation coverage of the sample plot is slightly smaller in the wet season than in the dry season,and in terms of the species diversity index,the wet season index value is greater than that in the dry season.In terms of soil water content,the wet season is greater than the dry season,and the July 2019 wet season is greater than the July 2018 wet season;the average water content of the wet season is about 10% higher than the dry season in terms of the water content of the three parts.The average soil water content in the season showed a trend of increasing with the catchment area?ditch head?ditch bed.The average soil bulk density of the total study area was smaller in the wet season in the first year than in the dry season,and in the second year,the wet season was slightly larger than in the dry season;the erosion gullies of the three sample areas in the wet season and the dry season had less porosity in the catchment area,which was not conducive to vegetation Growth;the soil porosity at the head of the ditch and the ditch bed is larger,which is good for vegetation growth.In the process of artificial vegetation restoration,if in order to improve the survival rate of vegetation,vegetation can be restored at the head and bed of the ditch first,and then the water catchment area can be restored.The soil organic matter in the wet season is significantly smaller than that in the dry season;the average value of the organic matter in the wet season is in the catchment area> gully bed> gully head.In the dry season,it appears gully bed> gully head> catchment area.After the vegetation grows in the wet season,the soil organic matter The erosion ditch shows an enrichment along the catchment path.The soil p H value is weakly acidic and neutral in the wet season,and weakly alkaline and alkaline in the dry season.Among the three sample areas,the soil p H value of Shadi Village is the smallest,which may have a greater relationship with the soil water content;three erosion ditches The p H value of the parts in July is between 6.8 and 7.0,and the average value in January is between 7.6 and 8.0.Among them,the p H value of the gully bed and catchment area is larger,and the p H value of the dry season of the head of the gully is relatively small,slightly alkaline or partial.Acidic soil is not suitable for vegetation growth.(2)The main relationship between soil and vegetation in the study area is shown in the following aspects:Soil water content is the limiting factor for plant growth in this sample area.From the perspective of the correlation between soil water content and the coverage of shrubs and herbs in the wet season in 2018 and 2019,there is a significant negative correlation between shrub coverage and soil water content The relationship between herb coverage and soil moisture content is not significant;in 2018 and 2019,the dry season soil moisture content and the coverage of shrubs and herbs show a significant positive correlation.The coverage of shrubs and soil water content are not significantly correlated.In Shadi Village,the correlation between total vegetation coverage and soil water content is not significant,and the correlation between the coverage of each layer of shrubs and herbs in wet and dry seasons and soil water content is not significant.There is no significant correlation between soil water content in wet season and community coverage in Julin Village;soil water content in dry season has a significant negative correlation with shrub community coverage,and a significant positive correlation with herb community coverage.Shrub coverage in the two seasons There was a significant negative correlation with herb coverage.There is a significant positive correlation between soil moisture content in wet season and herb coverage in Jinlei Village,but not significant correlation with shrub coverage,and no significant correlation between shrub and herb coverage;dry season soil moisture content is correlated with shrub coverage and herb coverage The correlation was not significant,but the shrub coverage and herb coverage showed a significant positive correlation.The correlation between soil water content and vegetation coverage and vegetation coverage in Xiaoleizai was not significant.In terms of soil water content and total vegetation diversity index,the total soil water content of the sample area in July 2018 and the plant diversity index are significantly negatively correlated,showing that the species diversity of the wet season in 2018 decreased with the increase of water content the trend of.In July 2018,the soil water content of Julin Village was significantly correlated with the plant diversity index.The correlation between the soil water content of Shadi Village and Jinlei Village and the vegetation diversity index was not significant,but most of the diversity indexes were extremely significant.relationship.In January 2019,there was a significant correlation between the soil water content of Shadi Village and the H index of the herb community,and the plant diversity index tended to increase with the increase of soil water content.There is a significant positive correlation between soil water content and shrub community diversity in the Julin village sample area.With the increase of soil water content,the shrub community indexes have a rising trend,and the community diversity indexes also have significant or extremely significant correlations.The soil water content of the Jinlei village sample area has a significant and extremely significant negative correlation with the Ma and Gl index of the herb community,and a significant negative correlation with the Gl index of the community.There is no significant correlation between vegetation coverage and soil bulk density in the wet and dry seasons.The correlation between vegetation diversity index and soil bulk density in wet and dry seasons is different,but the correlation is not significant.The vegetation coverage and diversity of erosion gullies in wet and dry seasons are not significantly correlated with soil p H.There is no significant correlation between vegetation coverage and soil organic matter in the wet season,but there is a phenomenon that soil organic matter decreases with the increase of vegetation coverage.It may be that there is a mutual conversion relationship between soil organic matter content and vegetation growth dynamics.The correlation between vegetation diversity and soil organic matter in eroded gully is not significant.