Why there is no natural sand in karst area

2022625  . ，、、、、

Studies on Hydrological Processes on Karst Slopes

2022510  The most important causes of soil and water loss are cultivation without soil and water conservation and the development of karst fissures, water holes and underground rivers, which are affected by

Geologic factors leadingly drawing the macroecological pattern Nature

2020129  Rocky desertification (RD) is a special process of land deterioration in karst topography, with a view of bedrock exposure and an effect of ecological degradation.

Land Special Issue : Karst Land System and Sustainable

202373  This Special Issue will mainly address the following scientific issues: (1) The evolution process of ecological and environmental quality, which is affected by climate

Assessment of water resource security in karst area of Guizhou Nature

202147  The subsystems of water resource carrying capacity and vulnerability in the Guizhou karst area have risen steadily, which has improved water resource security.

Changes in soil microbial communities from exposed rocks

Bryophytes and their symbiotic microorganisms are considered pioneers of vegetation restoration in karst areas (Cao et al. 2020 ). After vascular plant emergence, the role of

The karst water environment in Southeast Asia Springer

20201118  They experience a humid climate, and there are no karsts like those in the semi-arid regions of Shanxi in northern China or the arid regions of Nullarbor in

Sustainability Free Full-Text Realization and

2022930  In the karst areas of Guangxi, karst landforms are typical and widely distributed, with a total area of 8.334 million hm 2, accounting for 18.9% of the total area of karst land in southwestern China and 35.1% of

Changes in soil microbial communities from exposed rocks

1. Introduction. Karst is second only to desert as the most fragile natural ecosystem. Southwest China is one of the three major karst areas in the world (He et al. Citation 2008; Xue et al. Citation 2017).Degeneration of original vegetation types in Southwest China has continued since the 1970s due to anthropogenic reasons (Yao et al. Citation 2001);

Review: Groundwater resources and related environmental

2018510  Groundwater accounts for about a third of the total water resources and is used for drinking by 70% of the population in China. Water supply in more than 310 cities especially in the northern part of China, and 90% of the urban domestic and industrial water, depends on groundwater. Groundwater is of great important in guaranteeing the domestic

Water Free Full-Text Effects of Soil–Rock

2023911  Surface runoff on karst is a multifactorial hydrological process. There are a great number of studies focusing on rainfall–runoff from karst slopes on a large scale, but microscale studies related to soil–rock geomorphic units have been rarely reported. This study used rock–soil runoff plots on uncultivated land as a new form of natural rainfall

Characteristics, detection, and prevention of karst Springer

2018213  Karst-related sinkholes are globally recognized geohazards that can be triggered by mining activities. Totally, 136 sinkholes have occurred in the Laiwu iron ore mine area of Shandong Province, China. At the surface, the sinkholes are mostly round or oval shaped. Most are ceiling collapse sinkholes, and they have caused road and

Effects of rainfall and rocky desertification on soil erosion in karst

20221119  Therefore, the application of the RUSLE model in karst area needs to be further modified. These results can provide reference for rocky desertification control, soil erosion control and fragile ecosystem restoration in karst area. This work was supported by National Natural Science Foundation of China (NO., NO.);

Geological investigation and treatment measures against

202261  1. Introduction. Karst landforms are widely distributed in China, especially in Yunnan, Guizhou, Guangxi and Guangdong provinces in Southwest and Southeast China (Wang et al., 2019, Lai et al., 2020).The total area of karst landforms is approximately 3.444 million km 2, accounting for one third of China's land area (Cui et al., 2015).The

Karst groundwater in UNESCO protected areas: a global overview

2020727  Recent studies have clarified the global distribution of carbonate and evaporite karst and global utilisation of karst waters. This study provides an initial assessment of the extent to which UNESCO protected area designations cover areas with karst (carbonate and evaporite), and hence the groundwaters that they contain. There

Equivalent numerical simulation method and application in karst

202271  According to a large number of real cases and literature research, karst-induced collapse of overlying sand layer is common in nature. The construction of urban underground rail transit in this geological environment will face various risks, such as the collapse of karst cave roof, mud bursting, water inrush and large-area surface collapse

Effects of concentrated flow changes on runoff

202281  1. Introduction. Karst areas constitute some of the most fragile ecological areas worldwide (Jiang et al., 2014).Globally, karst rock mountains accounts for 12% of all land area, and China has the largest distribution area of any country; karst covers an area of approximately 344.3 × 104 km 2 and is mainly distributed in Guizhou, Guangxi, Yunnan,

Temporal Variations of Sediment Provenance in a Karst

202315  The environmental quality of the sediments in karst areas is a common concern, and it is of great significance to analyze the sources of the sediments. This study investigates the sources and its temporal variations of catchment sediments in a typical small karst watershed area. Toxic metal concentrations in the catchment area were

Rocky desertification in Southwest China: Impacts, causes,

201451  China has approximately 3.44 million km 2 of karst areas (buried, covered, and exposed carbonate rock areas), about 36% of its total land, and 15.6% of all the 22 million km 2 karst areas in the world. The seven provinces including Yunnan, Guizhou, Guangdong, Chongqing, Hunan, Hubei, and Sichuan and the Guangxi Zhuang

Simulated Short- and Long-Term Deformation in Coastal Karst

2022917  The self-balanced pressure arch theory is an important basis for excavation support in karst caves, but it is difficult to quantify the empirical theory in coastal areas. In addition, the rheological effects of karst strata could pose a hazard to engineering. Therefore, this study investigated the rheological mechanism under the self-balanced

Soil structure and nutrient contents in underground fissures

2019129  Southwestern China, centered on Guizhou Province, is the largest continuous karst region in the world (Sweeting 1993; Yang et al. 2014).The surface area of exposed karst in southwestern China is 510,000 km 2.This is not only the most developed and the most populated area in the world but it is also a typical, fragile ecological

Evolution of major environmental geological problems in karst

20121111  There are four characteristics conducive to typical variations of karst formation in China: hard compact and old-phase soluble rocks; strong Cenozoic uplift; heat-moisture match monsoon climate; and lack of glacial scouring (Yuan et al. 1991).The subtropical karst in Southern China was recognized as an inconic and representative

Land Free Full-Text Distribution Characteristics and Risk

2022818  To investigate the distribution characteristics and hazard levels of eight heavy metals (As, Cd, Cr, Cu, Hg, Ni, Pb, Zn) in karst soil with a high geological background of heavy metals, 32 and 40 surface soil samples were collected from limestone and clastic rock areas, respectively, in the northern part of Mashan County, Guangxi Province, a

Water Free Full-Text Laboratory Model Test and Field In

2023410  Karst depressions are ideal places for building reservoirs and stacking wastes, but karst depressions are mostly located in areas with strong karst development, and there is a problem of karst leakage. The study of karst depression monitoring methods can provide technical support for the construction of reservoirs in karst depressions, and

Groundwater Vulnerability and Groundwater Contamination Risk in Karst

2022114  Groundwater pollution in karst areas is often the result of the interaction of hydrogeological characteristics and human activities. In this study, a chimeric evaluation system of groundwater vulnerability and pollution load was constructed, and the groundwater contamination risk was intuitively displayed using a risk map. The study area is located in

Assessment of water resource security in karst area of Guizhou Nature

202147  This stone presents the assessment of water resource security in the Guizhou karst area, China. A mean impact value and back-propagation (MIV-BP) neural network was used to understand the

Impact of vegetation restoration on soil properties in near

202061  The sampling area is located in the karst area of Guizhou Province, which is located in the karst plateau of southwestern China (Fig. 1).Guizhou Province, known as the karst province, covers a total karst area of 113 thousand square kilometres with a 41 thousand-square-kilometre rocky desertification area and is the province undergoing the