Blue-Green Space Changes of Baiyangdian Wetland in Xiong’an New Area, China

Abstract

As a regulator of ecological environment, Baiyangdian Wetland is in a pivotal position in constructing the blue-green space (BGS) of Xiong’an New Area in China. This study aims to reveal the spatiotemporal changes of the BGS in Baiyangdian Wetland from 2016 to 2021. It uses Google Earth Engine (GEE) to calculate NDVI and NDWI based on Sentinel-2 Satellite remote sensing data and extracts the blue-green space by a classification model driven by NDVI and NDWI. Moreover, the land-use transfer matrix and landscape pattern indices are applied for evaluating the BGS changes in the wetland. According to the results, vegetation in the wetland shows no obvious spatial transfer. From 2016 to 2020, the BGS proportion in the wetland showed a stable increase, with the blue space getting larger by 10.8%. The indicators of the Number of Patches (NP), Patch Density (PD), Largest Patch Index (LPI), Contagion, and Landscape Shape Index (LSI) of the wetland decreased, suggesting a better ecological environment since the establishment of Xiong’an New Area in 2017. Based on the results, the author makes the following conclusion: the construction of BGS in Baiyangdian Wetland results in a well-organized ecological environment. The study provides a reference for building Xiong’an New Area and monitoring BGS changes in other regions.

Review on Ecological Response of Aquatic Plants to Balanced Harvesting

“…In 2017, the Xiongnu New Area started a pilot reed harvest. In 2020, based on the experimental harvest, a large-scale local reed harvest was carried out, mainly by mechanical harvesting on ice when Baiyangdian froze, which is approximately 10 times more efficient than manual harvesting [46].…”

Long time-series land cover classification study of Xiongan new area based on GEE platform and transfer learning

“…In-depth analysis of the current spatial characteristics of land use in Xiongan New Area and scientific planning is a prerequisite for the construction of Xiongan New Area, and identifying the type and distribution of land use and monitoring its changes are particularly important for the scientific planning of Xiongan New Area and the rational use of every inch of land [13] . Due to the impact of land use change on terrestrial ecosystems [14] , the demand for land use mapping has been growing, and images with high spatial, temporal, radiometric, and spectral resolution can be used for thematic mapping of larger areas in a relatively short period of time.…”

The Spatial and Temporal Variability of the Blue–Green Spatial Structures of the South Dongting Lake Wetland Areas Amidst Climate Change, including Its Relationship with Meteorological Factors

“…appear in large numbers and grow continuously on the shoal areas almost throughout the receding period, turning mudflats into meadows [15], which makes the blue and green spatial structure of the lake alternate in the flood and drought seasons. For the core area of the DTL, blue space refers to all natural and artificial water bodies in the area, and green space refers to all vegetated areas, including mudflat land, grassy flat land, poplar woodland, and reed land [16]. Extensive studies have been conducted on the characteristics and causes of the water regime changes in the DTL [17,18], the impact of the Three Gorges Project on water regime change [19][20][21], and the response of the DTL's wetland ecosystem to water level fluctuations [14,22].…”