1
|
Shijie P, Lei W, Yongkun L, Ruowen W, Tianming G, Zongjun G. A study on ecohydrological mutual feedback relationship of the Shangdong River basin based on hydrological connectivity. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 927:171957. [PMID: 38554977 DOI: 10.1016/j.scitotenv.2024.171957] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2023] [Revised: 02/18/2024] [Accepted: 03/23/2024] [Indexed: 04/02/2024]
Abstract
Investigating eco-hydrology in desert grasslands is pivotal to comprehend the dynamic evolution patterns of vegetation. Nonetheless, a research void persists in understanding the eco-hydrological mutual feedback mechanisms associated with hydrological connectivity and the corresponding health index evaluation of a small watershed. This study is centered on the Shangdong River watershed in Inner Mongolia and uses SWAT (Soil and Water Assessment Tool) to simulate hydrological processes. The hydrological connectivity index (IC) was employed as a link to conduct Pearson correlation analysis and Granger causality tests on ecological and meteorological-hydrological factors. Additionally, the PSR model was utilized to assess the ecological health status of the watershed. Key findings reveal the following: (1) The NDVI in the Shangdong River watershed showed an overall upward trend from 2007 to 2018, while IC exhibited an overall downward trend. Temporally and spatially, there was a significant negative correlation between IC and NDVI. (2) During the vegetation growth season, IC serves as a pivotal link in the feedback loop of eco-hydrological processes. Temperature drives vegetation growth, which in turn affects IC. IC regulates soil moisture content and evaporation, further influencing vegetation growth, thus forming a feedback mechanism. (3) Over the study period, the Grassland Health Composite Index (GHI) demonstrated a consistent rise, averaging 0.44, signaling a suboptimal state for the grassland ecosystem. Furthermore, a negative correlation was observed between GHI and IC. Consequently, regulating IC could play a crucial role in safeguarding and rejuvenating the grassland ecosystem. This study offers theoretical and data support for understanding eco-hydrological processes and effective pasture management of the desert grassland watershed.
Collapse
Affiliation(s)
- Pang Shijie
- Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid, Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, China; College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Wu Lei
- Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid, Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, China; Yinshanbeilu Grassland Eco-hydrology National Observation and Research Station, China Institute of Water Resources and Hydropower Research, Hohhot, Inner Mongolia 010020, China; College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China; State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, Yangling, Shaanxi 712100, China.
| | - Luo Yongkun
- Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid, Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, China; College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Wang Ruowen
- Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid, Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, China; College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Gao Tianming
- Yinshanbeilu Grassland Eco-hydrology National Observation and Research Station, China Institute of Water Resources and Hydropower Research, Hohhot, Inner Mongolia 010020, China
| | - Guo Zongjun
- Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid, Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, China; College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China
| |
Collapse
|
2
|
Rafaai NH, Lee KE. Reconciling and contextualising multi-dimensional aspects for consolidated water security index: A synthesis. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2024; 359:121067. [PMID: 38718607 DOI: 10.1016/j.jenvman.2024.121067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/06/2023] [Revised: 04/05/2024] [Accepted: 04/29/2024] [Indexed: 05/22/2024]
Abstract
The present paper aims to review and develop a Consolidated Water Security Index (CWSI) as a tool to evaluate water security status within river basins by considering five key dimensions, namely (i) water supply and sanitation, (ii) water demand and socio-economic, (iii) water ecosystem and environment, (iv) water-related disaster and (v) water governance. This index is a holistic assessment since it aims to capture the interconnected and complex nature of water-related issues by considering multiple dimensional aspects which helps stakeholders and policymakers to understand the overall status of water security. This framework uses the Analytic Hierarchy Process (AHP), involving pairwise comparison, normalisation and weighting. Then, a CWSI will be calculated using the Linear Aggregation method. The robustness of this consolidated index is validated using sensitivity analysis by modifying the weight in the linear aggregation formula. By following each step cautiously, a CWSI can be constructed and interpreted correctly, thus, becoming a powerful tool for conveying complex information to the different stakeholders and assessing the status of water security with river basins. The CWSI allows decision-makers to prioritise areas that are most at risk and facilitate sustainable planning and management of water resources.
Collapse
Affiliation(s)
- Nur Hairunnisa Rafaai
- Integrated Water Research Synergy Consortium (IWaReS), Institute for Environment and Development (LESTARI), Universiti Kebangsaan Malaysia, 43600, UKM, Bangi, Selangor, Malaysia
| | - Khai Ern Lee
- Integrated Water Research Synergy Consortium (IWaReS), Institute for Environment and Development (LESTARI), Universiti Kebangsaan Malaysia, 43600, UKM, Bangi, Selangor, Malaysia.
| |
Collapse
|
3
|
Study on Index of Groundwater Ecological Function Crisis Classification and Early Warning in Northwest China. WATER 2022. [DOI: 10.3390/w14121911] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The natural oases in the plain area of the northwest inland basin strongly depend on the groundwater depth. With the overexploitation and utilization of groundwater, natural oases are faced with the problems of serious degradation and rehabilitation. How to evaluate the degree of the degeneration crisis of groundwater ecological function has become one of the key scientific and technological problems to be solved. In this paper, the Shiyang River basin of Gansu Province was selected as a typical research area. The remote sensing interpretation, groundwater–soil ecology comprehensive investigation, and groundwater in situ monitoring were adopted to carry out the research. Based on the correlation analysis method of natural ecology and groundwater, the interactive relationship between the natural ecological environment and groundwater depth in different ecological types of the region were studied: (1) under the arid climate condition in northwest China, the relationships between the ecological situation and the groundwater depth in different ecological types of the region were obviously different, and as a result, the optimal or limit ecological water level of groundwater in different ecological types was also different; (2) in the natural wetland area, the suitable ecological water level of groundwater was between 0.5 m to 1.5 m, and the limit ecological water level was 8.0 m; in the natural vegetation area, the suitable ecological water level was between 3.0 m to 5.0 m, and the limit ecological water level was 10.0 m; and in the farmland area, the suitable ecological water level was between 2.0 m to 5.0 m, and the limit ecological water level was 2.0 m; (3) in order to effectively protect the natural ecology in different ecological types, a five-level early warning and control index system should be established for the ecological function degeneration crisis of groundwater. It may be beneficial to promote restoration and protection of the groundwater ecological function and natural ecology in the inland area of northwest China.
Collapse
|
4
|
Correction: Cao et al. The Ecological Relationship of Groundwater–Soil–Vegetation in the Oasis–Desert Transition Zone of the Shiyang River Basin. Water 2021, 13, 1642. WATER 2022. [DOI: 10.3390/w14071116] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
In the original publication [1], there were two mistakes in Figure 12: (1)The description of vegetation type in Figure 12c is wrong [...]
Collapse
|
5
|
Influence of Multi-Layered Structure of Vadose Zone on Ecological Effect of Groundwater in Arid Area: A Case Study of Shiyang River Basin, Northwest China. WATER 2021. [DOI: 10.3390/w14010059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The natural vegetation in arid areas of northwest China is strongly dependent on the availability of groundwater. Significantly, capillary water plays an essential role in regulating the ecological groundwater level in the multilayered structure of the vadose zone. The soil-column test and field survey in the lower reaches of the Shiyang River Basin were conducted to investigate the influence of the multi-layered structure of the vadose zone on maintaining the ecological effect of groundwater. Based on the field survey, the results show that the depth of groundwater is 3.0 m, and the rising height of capillary water is 140 cm. In the soil-column test, the height of the wetting front of the column was 125 cm. During the water releasing test, the water held by the vadose zone was 182.54 mm, which would have maintained Haloxylon’s survival in a growing season. Therefore, the multi-layered structure of the vadose zone extends the ecological groundwater depth and consequently enhances the ecological function of groundwater. Importantly, with a lower groundwater level, the clay soil layer within the rising height range of the original capillary water would hold more water and maintain a higher water content for a certain period to supply surface vegetation.
Collapse
|