Characteristics of urban expansion in megacities and its impact on water-related ecosystem services: A comparative study of Chengdu and Wuhan, China

Ecological Indicators, Journal Year: 2023, Volume and Issue: 158, P. 111322 - 111322

Published: Nov. 28, 2023

The megacity expansion that continues to occur in developing countries is an unavoidable trend at this stage, yet there exists a dearth of knowledge regarding the comprehensive impacts urban on water-related ecosystem services (WESs) within these areas. Taking Chengdu and Wuhan, two megacities upper middle Yangtze River Economic Belt China as study area, first compare magnitude, rate, spatial divergence, mode expansion; then evaluate its impact three typical types WESs, i.e., water yield (WY), purification (WP), habitat quality (HQ) using econometric models bivariate Moran's I. research findings show Chengdu's suburbs tend experience edge-based along rivers, while Wuhan's city center also spreads outward from river junctions Han rivers. Urban negatively all effect greater than Wuhan. WY Wuhan severely impacted by expansion, WP well. HQ suffers largest negative impact. reveals spillover with extensive externalities WESs centers both cities positive southwestern Chengdu. Based results, we suggest should focus protecting limiting cross-regional suburbs. Attention be paid water-ecological protection suburb City managers consider ecological zoning geared toward conservation address adverse expansion.

Language: Английский

Seasonal variations in ecosystem service supply and demand based on the SWAT model: A case study in the Guanting Reservoir Basin, China

Ecological Indicators, Journal Year: 2024, Volume and Issue: 158, P. 111552 - 111552

Published: Jan. 1, 2024

The match and mismatch between the supply demand of ecosystem services (ESs) are closely related to watershed sustainable development. Previous studies have mainly focused on annual or interdecadal matching relationships, little is known about seasonal variations ES supply–demand relationship. Based SWAT (Soil Water Assessment Tool) model statistical data, we took Guanting Reservoir Basin, a transitional from semi-arid areas arid areas, as study area analyze water provisioning soil conservation identified their relationship scale. results showed that was in short supply, with ratio 0.81, whereas excess demand. In terms variation, particularly severe winter, followed by spring. relatively summer. Such mismatches imply must pay attention misallocation resources caused variations. It crucial policy-makers consider role reservoirs transfer providing sources for sustaining optimize land management prevent aggravation erosion winter.

Language: Английский

Spatiotemporal evolution of urban landscapes in Chinese historic water towns (1918–2021)

Landscape Research, Journal Year: 2024, Volume and Issue: 49(4), P. 568 - 583

Published: March 6, 2024

This study explores the spatiotemporal evolution of urban landscapes in 19 Chinese historic water towns northern Zhejiang plain. Utilising historical maps and remote sensing images, we derived 2-D morphological patterns from town ground plans 1918, 1969, 2000, 2021 to represent landscape fractions (buildings, lands, waters). Morphology-based metrics reveal three distinct periods dynamics over past century: stabilisation (1918–1969), accelerated growth (1969–2000), high-speed (2000–2021). Our findings present a diminishing role rivers shaping land fragments riverscapes, behind which is weakening conventional water-human relationship during towns' modern urbanisation. The results offer insights into shifting regional heterogeneity, prompting further considerations hydrology-oriented design planning conserve landscapes.

Language: Английский