Analysis of the karst springs’ supply sources in rocky desertification area of Guanling–Huajiang, Guizhou, China

Liu, Qi; Deng, Dapeng; Yao, Bangjie; Liao, Qidi

doi:10.1007/s13146-020-00623-3

Cited by 8 publications

(3 citation statements)

References 19 publications

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“…In this study, the distribution trend of DOC concentrations was consistent with MBC at different bedrock exposure rates. The main factors affecting MBC and DOC in rocky desertification areas could be the fact that that SF is richer in plant species composition, more shrubs and more organic matter [46], but rainwater scouring is more serious, microorganisms do not decompose organic matter sufficiently, and organic matter is lost by rainwater [47]. In contrast, IBE showed that there was less organic matter and less lost, and most of it was concentrated in soil [43].…”

Section: Discussionmentioning

confidence: 99%

Changes in the Soil Labile Organic Carbon Fractions following Bedrock Exposure Rate in a Karst Context

Zheng

Rao

et al. 2022

Forests

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Soil labile organic carbon fractions (SLOCFs) mainly include microbial biomass carbon (MBC), dissolved organic carbon (DOC), easily oxidized organic carbon (EOC) and light fraction organic carbon (LFOC). The link between bedrock exposure rates with SLOCFs and the carbon pool management index under karst rocky desertification has not been well understood. We selected the bedrock exposure rate and vegetation coverage of 30–50% (light bedrock exposure, LBE), 50–70% (moderate bedrock exposure, MBE) and >70% (intense bedrock exposure, IBE) as the experimental sample plots according to the classification standard of karst rocky desertification, and then selected a sample plot of 0–30% (secondary forest, SF) as the control. This study compared the concentrations and stocks of soil organic carbon (SOC) and SLOCFs and analyzed the relevant carbon pool management index on karst landforms at Anshun, S.W. China. The aims were to determine the relationship between bedrock exposure rates and SLOCFs and to identify the most limiting factors for SLOCFs in karst rocky desertification areas. We found that (1) the concentrations and stocks of SLOCFs declined with increasing soil depth. SOC, DOC and MBC showed IBE (intense bedrock exposure) > LBE (light bedrock exposure) > MBE (moderate bedrock exposure) > SF (secondary forest); LFOC decreased with increasing bedrock exposure rate, and EOC did not show obvious regularity. (2) The carbon pool management index and sensitivity index had significant differences under different bedrock exposure rates. Redundancy analysis and linear regression showed that the increase in bedrock exposure rate had a great impact on MBC, DOC, EOC and SOC. In conclusion, the increase of bedrock exposure rate has no side impact on the DOC, EOC and MBC of the soil, but side effects are exhibited by LFOC. secondary forest improves the integrity of karst landscapes, and does not change the soil properties as well as the concentrations and stocks of SLOCFs in karst rocky desertification areas.

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Section: Discussionmentioning

confidence: 99%

Changes in the Soil Labile Organic Carbon Fractions following Bedrock Exposure Rate in a Karst Context

Zheng

Rao

et al. 2022

Forests

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“…Several researchers previously identified recharge elevations of karst groundwater in southwest areas based on this pattern. For instance, Liu et al [120] investigated the recharge sources of karst springs in the triangle area between the north bank of the Beipanjiang River and the west bank of the Dabang River in Guanling County, Guizhou Province. Based on the δD value of spring water samples and the correlations between isotopic values (δD and δ 18 O) in rainwater with altitude, the average elevation of the supply area is calculated.…”

Section: Recharge Elevation Of Karst Groundwatermentioning

confidence: 99%

The Characteristics and Application of Deuterium and Oxygen Isotopes to Karst Groundwater, Southwest China

Tang,

Yu,

You

et al. 2024

Water

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Stable isotopes in natural water bodies serve as hydrologic tracers, with a history of extensive application in karst groundwater research. The present paper is a systematic review of previous research results, with the objective of sorting out and summarizing the stable isotopic characteristics of karst groundwater in southwest China, which is the most typical karst region worldwide. Comprehensive analysis reveals that the deuterium and oxygen isotope values of most karst groundwater are characterized temporally as ‘enriched in the rainy season and depleted in the dry season’, which is the opposite of the pattern of precipitation. While the spatial distribution feature is basically consistent with the spatial variation pattern of precipitation, which is characterized as ‘depleted from the coast to the interior’. Additionally, the main applications of stable isotopes to karst groundwater are discussed, including karst groundwater recharge source and recharge elevation identification, research on karst groundwater in the hydrological cycle, the hydrological process of karst groundwater, and karst groundwater contamination tracking. Finally, we looked forward to future research on karst groundwater based on deuterium and oxygen isotopes. It is our hope that this review may provide insight into the study of karst groundwater.

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“…Karst landforms are widespread globally, accounting for 15% of the global land area ( Liu et al, 2020b ; Zhang et al, 2021 ). Southwest China possesses one of the largest continuous Karst regions (~550,000 km 2 ) in the world ( Han et al, 2021 ; Wang et al, 2019 ).…”

Section: Introductionmentioning

confidence: 99%

Effects of high Ca and Mg stress on plants water use efficiency in a Karst ecosystem

Qu¹,

Han²

2022

PeerJ

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Background Karst ecosystems are widely distributed in the world, with one of the largest continuous Karst landforms in Southwest China. Karst regions are characterized by water shortage, high soil calcium (Ca) and magnesium (Mg) content, and soil nutrient leaching, resulting in drought stress and growth limitation of plants. Methods This study compared nitrogen (N), phosphorus (P), potassium (K), Ca, and Mg of herbaceous and woody plants in a small Karst ecosystem in Southwest China. The indexes of water use efficiency (WUE) were calculated to identify the drought stress of plants in this Karst ecosystem. Meanwhile, the relationship between Ca and Mg accumulation and WUE was evaluated in herbaceous and woody plants. Results Herbaceous plants showed a higher content of leaf N (13.4 to 40.1 g·kg−1), leaf P (2.2 to 4.8 g·kg−1) and leaf K (14.6 to 35.5 g·kg−1) than woody plants (N: 10.4 g to 22.4 g·kg−1; P: 0.4 to 2.3 g·kg−1; K: 5.7 to 15.5 g·kg−1). Herbaceous plants showed a significantly positive correlation between WUE and K:Ca ratio (R = 0.79), while WUE has a strongly positive correlation with K:Mg ratio in woody plants (R = 0.63). Conclusion Herbaceous plants suffered from nitrogen (N) limitation, and woody plants were constrained by P or N+P content. Herbaceous plants had higher leaf N, P, and K than woody plants, while Ca and Mg showed no significant differences, probably resulting from the Karst environment of high Ca and Mg contents. Under high Karst Ca and Mg stress, herbaceous and woody plants responded differently to Ca and Mg stress, respectively. WUE of herbaceous plants is more sensitive to Ca stress, while that of woody plants is more sensitive to Mg stress. These findings establish a link between plant nutrients and hydraulic processes in a unique Karst ecosystem, further facilitating studies of the nutrient-water cycling system in the ecosystem.

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Analysis of the karst springs’ supply sources in rocky desertification area of Guanling–Huajiang, Guizhou, China

Cited by 8 publications

References 19 publications

Changes in the Soil Labile Organic Carbon Fractions following Bedrock Exposure Rate in a Karst Context

Changes in the Soil Labile Organic Carbon Fractions following Bedrock Exposure Rate in a Karst Context

The Characteristics and Application of Deuterium and Oxygen Isotopes to Karst Groundwater, Southwest China

Effects of high Ca and Mg stress on plants water use efficiency in a Karst ecosystem

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