scholarly journals Spatiotemporal characteristics of karst rocky desertification and the impact of human activities from 2010 to 2015 in Guanling County, Guizhou Province

2019 ◽  
Vol 38 (11) ◽  
pp. 1759-1769
Author(s):  
Yonghui YAO ◽  
Dongzhu SUONAN ◽  
Junyao ZHANG ◽  
Yufan HU ◽  
Zhixiang KOU ◽  
...  
Keyword(s):  
Human Activities ◽  
Guizhou Province ◽  
Karst Rocky Desertification ◽  
Rocky Desertification ◽  
Spatiotemporal Characteristics ◽  
The Impact

scholarly journals Study on Karst Rock Desertification by Human-Nature Interaction: A Case Study of Fengshan County of Guangxi, China

2014 ◽  
Vol XL-8 ◽  
pp. 493-498
Author(s):  
G. Zhou ◽  
C. Su ◽  
R. Zhang ◽  
Y. Shi ◽  
Y. Liu ◽  
...  
Keyword(s):  
Population Density ◽  
Human Activities ◽  
Rate Of Change ◽  
Annual Growth Rate ◽  
Net Income ◽  
Karst Rocky Desertification ◽  
Rocky Desertification ◽  
Local Society ◽  
Relationship Of ◽  
The Impact

Rocky desertification is a process of soil erosion leading to the bareness of bedrock, and is a kind of typical natural disaster in karst areas, which seriously constrains the developments of local society and economy. This paper studies the impact of human activities on the changes of rocky desertification. With the interpretation of remote sensing images of Fengshan County, GuangXi, China covering 1990, 1995 and 2005, this paper analyzes the relationship of the changes of social and economic index (including population density, agricultural population, rural per capital net income, and farmland) and the changes of rocky desertification in recent 15 years. The results indicate that: in recent 15 years, the average annual growth rate of rocky desertification, rate of change of population density, agricultural population, rural per capita net income, and farmland area are 8.7375 km<sup>2</sup> /year, 0.7 person/km<sup>2</sup>.year, 1153 person/year, 85 Yuan/year, and &minus;269.1 ha/year, respectively. The first three of social and economic indicators at different degrees of growth, show a positive correlation with rocky desertification change. However, farmland area, which has been diminishing, shows a negative correlation with rocky desertification. The influence of human activities for karst rocky desertification can be regarded as population growth &ndash; steep slope reclamation &ndash; the destruction of vegetation &ndash; erosion &ndash; rocky desertification &ndash; poverty.

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.

scholarly journals Are Karst Rocky Desertification Areas Affected by Increasing Human Activity in Southern China? An Empirical Analysis from Nighttime Light Data

2019 ◽  
Vol 16 (21) ◽  
pp. 4175
Author(s):  
Shi ◽  
Yang ◽  
Li
Keyword(s):  
Human Activities ◽  
Socioeconomic Development ◽  
Infrared Imaging ◽  
Southern China ◽  
Annual Growth Rate ◽  
Karst Rocky Desertification ◽  
Rocky Desertification ◽  
Nighttime Lights ◽  
Nighttime Light ◽  
Night Lights

Due to remarkable socioeconomic development, an increasing number of karst rocky desertification areas have been severely affected by human activities in southern China. Effectively analyzing human activities in karst rocky desertification areas is a critical prerequisite for managing and restoring areas with tremendous negative impacts from desertification. At present, a timely and accurate way of quantifying the spatiotemporal variations of human activities in karst rocky desertification areas is still lacking. In this communication, we attempted to quantify human activities from the corrected Suomi National Polar-orbiting Partnership (NPP) Visible Infrared Imaging Radiometer Suite (VIIRS) Day/Night Band (DNB) nighttime light composite data from 2012 to 2018 based on statistical analysis. The results show that a significant increase of night lights could be clearly identified during the study period. The total nighttime lights (TL) related to severe karst rocky desertification (S) were particularly concentrated in Guizhou and Yunnan. The nighttime light intensity (LI) related to the S areas in Chongqing was the strongest due to its rapid socioeconomic development. The annual growth rate of nighttime lights (GL) has been slow or even negative in Guangdong because of its various karst rocky desertification restoration programs. This communication could provide an effective approach for quantifying human activities and provide useful information about where prompt attention is required for policy-making on the restoration of the karst rocky desertification areas.

scholarly journals Are Karst Rocky Desertification Areas Affected by Increasing Human Activity in Southern China? An Empirical Analysis from Nighttime Light Data

2019 ◽  
Author(s):  
Kaifang Shi ◽  
Qingyuan Yang ◽  
Yuanqing Li
Keyword(s):  
Human Activities ◽  
Socioeconomic Development ◽  
Southern China ◽  
Annual Growth Rate ◽  
Karst Rocky Desertification ◽  
Rocky Desertification ◽  
Nighttime Lights ◽  
Nighttime Light Data ◽  
Nighttime Light ◽  
Night Lights

Due to remarkable socioeconomic development, an increasing number of karst rocky desertification areas have been severely affected by human activities in southern China. Effectively analyzing human activities in karst rocky desertification areas is a critical prerequisite for managing and restoring areas with tremendous negative impacts from desertification. At present, a timely and accurate way of quantifying the spatiotemporal variations of human activities in karst rocky desertification areas is still lacking. In this communication, we attempted to quantify human activities from the corrected NPP-VIIRS nighttime light data from 2012 to 2018 based on statistical analysis. The results show that a significant increase of night lights could be clearly identified during the study period. The total nighttime lights (TL) related to severe karst rocky desertification (S) were particularly concentrated in Guizhou and Yunnan. The nighttime light intensity (LI) related to the S areas in Chongqing were the strongest due to its rapid socioeconomic development. The annual growth rate of nighttime lights (GL) has been slow or even negative in Guangdong because of its various karst rocky desertification restoration programs. This communication could provide an effective approach for quantifying human activities and provide useful information about where prompt attention is required for policy-making on the restoration of the karst rocky desertification areas.

scholarly journals Bryophytes and the symbiotic microorganisms, the pioneers of vegetation restoration in karst rocky desertification areas in southwestern China

2019 ◽  
Vol 104 (2) ◽  
pp. 873-891 ◽  
Author(s):  
Wei Cao ◽  
Yuanxin Xiong ◽  
Degang Zhao ◽  
Hongying Tan ◽  
Jiaojiao Qu
Keyword(s):  
Microbial Communities ◽  
Function Analysis ◽  
Guizhou Province ◽  
Karst Rocky Desertification ◽  
Rocky Desertification ◽  
Moss Species ◽  
Drought Resistant ◽  
Bacteria And Fungi ◽  
Microbial Groups ◽  
Degraded Ecosystems

AbstractIn karst rocky desertification areas, bryophytes coexist with algae, bacteria, and fungi on exposed calcareous rocks to form a bryophyte crust, which plays an irreplaceable role in the restoration of karst degraded ecosystems. We investigated the biodiversity of crust bryophytes in karst rocky desertification areas from Guizhou Province, China. A total of 145 species in 22 families and 56 genera were identified. According to frequency and coverage, seven candidate dominant mosses were screened out, and five drought-resistant indexes of them were measured. Hypnum leptothallum, Racopilum cuspidigerum, and Hyophila involuta have high drought adaptability. We explored the interactions between two dominant mosses (H. leptothallum, H. involuta) and the structure of microbial communities in three karst rocky desertification types. Microbial diversity and function analysis showed that both moss species and karst rocky desertification types affect microbial communities. Moss species much more strongly affected the diversity and changed the community composition of these microbial groups. Bacteria were more sensitive in the microbiome as their communities changed strongly between mosses and drought resistance factors. Moreover, several species of fungi and bacteria could be significantly associated with three drought-resistant indexes: Pro (free proline content), SOD (superoxide dismutase activity), and POD (peroxidase activity), which were closely related to the drought adaptability of mosses. Our results enforced the potential role of moss-associated microbes that are important components involved in the related biological processes when bryophytes adapted to arid habitats, or as one kind of promoters in the distribution pattern of early mosses succession in karst rocky desertification areas.

scholarly journals Discussing the genesis of karst rocky desertification research based on the correlations between cropland and settlements in typical peak-cluster depressions

Solid Earth ◽  
2016 ◽  
Vol 7 (3) ◽  
pp. 741-750 ◽  
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 ◽  
Land Cultivation ◽  
The Relationship ◽  
Local Farmers

Abstract. This paper attempts to explain the theoretical reasons why local farmers have executed land mismanagement measures such as steep slope land cultivation, in order to reveal the  mechanisms of karst rocky desertification (KRD, including light KRD, moderate KRD and severe KRD) through typical case studies. Firstly, this paper assumes that the low land capacity is the initial cause of KRD in peak-cluster depression areas. Furthermore, the ecological quality of the peak-cluster depression zone (a combination of clustered karst cones with a common base and depressions between cones) is influenced by the relationship between the area of depressions and the population of residential areas. Therefore, six typical peak-cluster depression areas of Guizhou province were selected to compare the distribution circumstances of cropland, the characteristics of settlements and the formation of KRD with the help of ALOS images in 2010 (with a resolution of 10 m × 10 m). The results show that there is a negative correlation between the percentage of the cultivated land and the percentage of KRD at peak-cluster depressions. The relationship could be concluded by three situations of the process of KRD, which are low, middle and upper carrying capacities of land. Severe KRD is only distributed in peak-cluster depression areas with less flatland, low land capacity and a high population. The harmonization between population pressure and bearing capacity of land will influence the ecological qualities in the peak-cluster depressions. The KRD phenomenon which occurred in six typical peak-cluster depression areas confirms that the hypothesis suggested by this paper is correct, and this result will contribute to understanding the natural mechanisms of KRD and guide the ecological restoration of KRD land.

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