scholarly journals Effects of Biological Crust on Soil Properties under Different Karst Rocky Desertification Habitats

2021 ◽  
Author(s):  
Zhiheng Zheng ◽  
Kangning Xiong ◽  
Li Rong ◽  
Yongkuan Chi
Keyword(s):  
Soil Properties ◽  
Karst Rocky Desertification ◽  
Rocky Desertification ◽  
Biological Crust

Recovery Dynamics of Vegetation and Soil Properties in Karst Rocky Desertification Areas in Guizhou, China

2012 ◽  
Vol 518-523 ◽  
pp. 4532-4544 ◽  
Author(s):  
Hong Yan Liu ◽  
Fang Liu
Keyword(s):  
Soil Fertility ◽  
Soil Properties ◽  
Vegetation Structure ◽  
Vegetation Recovery ◽  
Native Forest ◽  
Forming Process ◽  
Karst Rocky Desertification ◽  
Rocky Desertification ◽  
Available Nitrogen ◽  
Dynamics Of Vegetation

Abstract. Dynamics of vegetation and soil properties responses to vegetation recovery in the selected 72 Karst desertification sites in Guizhou, China were studied. Six typical and representative vegetation types along a chronosequence of vegetation recovery (corn land, sparse grass, regeneration forest, shrub, grass and shrub, and native forest with 0, 3-5, 10-15, 20-30, 30-40, and >100 yrs, respectively) were selected for the study of the plant species, vegetation features as well as soil physical & chemical properties in order to assess interaction between soil properties and vegetation structure. It was found that vegetation species had dry-resistant characteristics because of their extensive exposure to the basement rocks and thinness soil. Grass community was always coarse grass, shrub was generally dominated by vines, thorn bushes and tree species were almost leather-like, single and mini-type leaf plants. Factor analysis showed that the 3 factors, soil fertility, pH and clay, explain 67.97 % of total variance among the 19 soil property parameters. Soil fertility changed significantly effects included the increasing of soil organic matter, total and available nitrogen, humic acid, CEC, fuvic acid, exchange Ca, porosity and total P but decreasing bulk density. This trend was followed by enhancing of bio-enrichment capacity along the chronosequence of vegetation recovering process. Soil pH had no significant correlation with the vegetation recovery stages because it was determined by soil forming process and characteristic of parent materials. The factor clay only decreased slightly in the recovery stages. Cluster analysis indicated that vegetation structure could develop within short time under anthropocentric interfering, but soil fertility only accumulated with annual litter decomposing. We can conclude that recovery of vegetation community structure proceeded restoration of soil function.

scholarly journals The Effects of Vegetation Restoration and Season On Soil Enzyme Activity and Microbial Communities in Karst Rocky Desertification Area

2021 ◽  
Author(s):  
Zhang Guo ◽  
Chunyan Zheng ◽  
Zhu Chen ◽  
Jin Wang ◽  
Yanghua Yu ◽  
...  
Keyword(s):  
Enzyme Activity ◽  
Microbial Community ◽  
Microbial Biomass ◽  
Soil Properties ◽  
Southwest China ◽  
Vegetation Type ◽  
Soil Enzyme ◽  
Vegetation Types ◽  
Karst Rocky Desertification ◽  
Rocky Desertification

Abstract Aims The process of karst rocky desertification has been closely related to improper land use in southwest China. Now this habitat is the subject of an important ecological restoration project. However, the changes in soil properties and microbial characteristics in response to this vegetation restoration remain poorly understood.Methods We investigated four vegetation types, including dragon fruit, Chinese pepper, walnut teak, with corn as a control, in southwest China, in 2019. We measured the impacts of these vegetation types on soil properties and microbial biomass, enzyme activity, and microbial community composition (using high-throughput sequencing technology).Results The different vegetation types had significantly different impacts on soil exchangeable Ca2+, soil organic carbon and available nutrients. The vegetation types also significantly affected microbial biomass. Soil enzyme activity, including b-1,4-glucosidase, b-1,4-N-acetylglucosaminidase, alkaline phosphatase, and catalase, were significantly different among vegetation types. All vegetation types were dominated by the bacterial phyla Acidobacteria, Proteobacteria, and Actinobacteria and the fungal phylum Ascomycota, except for corn which was dominated by the fungal phylum Mucoromycota. Non-metric multidimensional scaling (NMDS) showed that the vegetation type exhibited different microbial b-diversity, especially in winter. The vegetation type, season, and soil properties collectively explained 46% and 59% of soil bacterial and fungal community composition, respectively. The bacterial-fungal interactions under the six vegetation types were distinctly different between summer and winter.Conclusions Compared with traditional corn, the restoration of natural vegetation partially reversed KRD by improving soil properties, increasing microbial biomass, and differentiating the microbial community structures in the different vegetation types.

scholarly journals Discussing the Genesis of Karst Rocky Desertification-research Based on the Correlations between Crop land and Settlement in Typical Peak-cluster Depressions

2016 ◽  
Author(s):  
Yang Bing Li ◽  
Qiong Yao Li ◽  
Guang Jie Luo ◽  
Xiao Yong Bai ◽  
Yong Yan Wang ◽  
...  
Keyword(s):  
Population Pressure ◽  
Guizhou Province ◽  
Residential Areas ◽  
Karst Rocky Desertification ◽  
Rocky Desertification ◽  
Peak Cluster ◽  
Natural Mechanism ◽  
The Relationship ◽  
Local Farmers

Abstract. This paper attempts to explain the theoretical reasons why the local farmers took irrational activities such as steep slope land cultivations in order to reveal the mechanism of Karst Rocky Desertification (KRD) through those typical case studies. Firstly, this paper assumes that the low land capacity is the genesis cause of KRD in peak cluster-depression areas. Furthermore, the ecological quality of the peak cluster-depression zone is influenced by the relationship between the area of depressions and the population of residential areas. The results show that, six typical peak cluster-depression areas in Guizhou Province were selected to compare the distribution circumstances of croplands, the characteristics of settlements and the formation of KRD. Also, the results show that there is a negative correlation between the percentage of the cultivated land and the percentage of KRD (including light KRD, moderate KRD and severe KRD at peak cluster-depressions. The relationship could be concluded as three situations of the process of KRD, which are low, middle and upper carrying capacity of land. The severe KRD is only distributed in peak-cluster depression areas with less flatland, low land capacity and high population. The harmonization between population pressure and bearing capacity of land will influence the ecological qualities in the peak cluster depressions. Therefore, the hypothesis suggested by this paper is correct, and this result will contribute to understanding the natural mechanism of KRD and guide the ecological restoration of KRD land.

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