Study on the relationship between vegetation cover and groundwater depth in the middle reaches of Golmud River
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Abstract:
In the arid inland basin, groundwater has a great influence on the distribution of vegetation. In the middle reaches of the Golmud River, the distribution of vegetation is also groundwater-dependent. We used the normalized difference vegetation index (NDVI) and field observation data of groundwater depth to study the relationship between vegetation distribution and groundwat erdepth. The results showed that when the groundwater depth was less than 4m, the mean NDVI would decrease with the increase of groundwater depth. When the groundwater depth was greater than 4m but less than 8m, the growth of vegetation was affected and became less sensitive to groundwater. When the groundwater depth was more than 8m, the vegetation cover declined seriously, and was not sensitive to the change of groundwater depth. We consider 8m to be the upper limit of groundwater depth that affects vegetation cover in the study area. The regional ecological environment will be severely affected when the groundwater depth is beyond this limit. Different vegetation types were differently influenced by groundwater: The growth of Myricaria was closely associated with groundwater. For salt meadow reed and Ephedra przewalskii, the relationship between their growth and groundwater was complex probably because of soil salinization. A comparison of the research results of different research areas revealed that due to rainfall, evapotranspiration, hydrogeological conditions, human activities, and other factors, the correlation between vegetation and groundwater varied significantly.
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