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Open AccessArticle

Study on Ecological Threshold of Groundwater in Typical Salinization Area of Qian’an County

by 1,2,3,4, 1,2,3,4, 1,2,3,4 and 1,2,3,4,*
1
Key Laboratory of Groundwater Resources and Environment, Jilin University, Ministry of Education, No 2519, Jiefang Road, Changchun 130021, China
2
Jilin Provincial Key Laboratory of Water Resources and Environment, Jilin University, Changchun 130021, China
3
National-Local Joint Engineering Laboratory of In-Situ Conversion, Drilling and Exploitation Technology for Oil Shale, Changchun 130021, China
4
College of New Energy and Environment, Jilin University, No 2519, Jiefang Road, Changchun 130021, China
*
Author to whom correspondence should be addressed.
Academic Editor: Christophe Piscart
Water 2021, 13(6), 856; https://doi.org/10.3390/w13060856
Received: 21 February 2021 / Revised: 17 March 2021 / Accepted: 18 March 2021 / Published: 20 March 2021
(This article belongs to the Section Hydrology and Hydrogeology)
A suitable groundwater level is an important condition to maintain the stability of the vegetation community, especially in arid and semi-arid areas. The surface of Qian’an County in Western Jilin Province is often accompanied by salinization due to the influence of natural and human factors. In order to maintain the healthy development of ecological vegetation and reduce the risk of soil salinization, the concept of an ecological threshold of groundwater level is proposed, and two methods are used to determine the reasonable ecological threshold of groundwater. (1) Based on field investigation and indoor experiment, the data layer of soil texture, land use type and groundwater mineralization degree in the research area was established by using remote sensing technology and GIS technology. According to the thickness of vegetation root layer and the height of capillary rise of different soil and water types, the influence of groundwater salinity is considered, and the sum of the two is taken as the ecological threshold of groundwater in the study area. The reasonable threshold value of suitable growth of various vegetation crops is 3.76~5.66 m. (2) According to the relationship between the normalized vegetation index (NDVI) and the groundwater buried depth and phreatic salt, the groundwater buried depth and the mineralization degree under the best vegetation cover are analyzed as follows: the buried depth of groundwater is between 4.8 m and 6.1 m, and the salinity of groundwater is between 0.37 and 1.25 g/L, which are reasonable groundwater properties in the study area of the ecological threshold. This result not only enriches and broadens the content of groundwater research, but also helps to predict the prospect of water resource development. View Full-Text
Keywords: groundwater ecological threshold; vegetation coverage; soil salinization; soil desertification; hydrous water salt simulation groundwater ecological threshold; vegetation coverage; soil salinization; soil desertification; hydrous water salt simulation
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MDPI and ACS Style

Qi, Z.; Xiao, C.; Wang, G.; Liang, X. Study on Ecological Threshold of Groundwater in Typical Salinization Area of Qian’an County. Water 2021, 13, 856. https://doi.org/10.3390/w13060856

AMA Style

Qi Z, Xiao C, Wang G, Liang X. Study on Ecological Threshold of Groundwater in Typical Salinization Area of Qian’an County. Water. 2021; 13(6):856. https://doi.org/10.3390/w13060856

Chicago/Turabian Style

Qi, Zhiwei; Xiao, Changlai; Wang, Ge; Liang, Xiujuan. 2021. "Study on Ecological Threshold of Groundwater in Typical Salinization Area of Qian’an County" Water 13, no. 6: 856. https://doi.org/10.3390/w13060856

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