Vegetation sustainability in relation to water resources in typical sandy areas of eastern China

doi:10.7522/j.issn.1000-694X.2024.00003

Journal of Desert Research ›› 2024, Vol. 44 ›› Issue (4): 111-125.DOI: 10.7522/j.issn.1000-694X.2024.00003

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Vegetation sustainability in relation to water resources in typical sandy areas of eastern China

Fanrui Bu(), Ying Liu, Xueyong Zou, Chunlai Zhang

State Key Laboratory of Earth Surface Processes and Resource Ecology / MOE Engineering Research Center of Desertifi‐cation and Blown-Sand Control，Faculty of Geographical Science，Beijing Normal University，Beijing 100875，China

Received:2023-10-28 Revised:2024-01-05 Online:2024-07-20 Published:2024-08-29

Abstract

Abstract:

When restoring or rebuilding sandy vegetation in arid areas， precipitation and shallow groundwater are two key factors in determining vegetation stability， because vegetation can only be stable and sustainable in its windbreak and sand fixation function when the water demand of vegetation， precipitation and groundwater replenishment are in balance. In this paper， Mu Us Sandy Land and Horqin Sandy Land， which are typical sandy lands in eastern deserts of China， were selected， and vegetation coverage data， meteorological station data， groundwater data and field survey data with continuous time phases were used， the dynamic changes of sandy moisture and the balance between vegetation water demand and water supply were calculated. The results showed：（1） Mu Us Sandy Land and Horqin Sandy Land had the highest correlation between VC during the growth season and P in the previous year and the current year， separately. The response of each grid buffer zone to groundwater is also abundant in a one-year lag and different vegetation types have different lag times in responding to changes in P and groundwater. （2） The monthly vegetation water demand and average monthly W of vegetation in these two sandy areas showed an increasing trend in each growing season， with significant spatial variation；（3） The main source of water demand for vegetation in the Mu Us Sandy Land and Horqin Sandy Land is groundwater， and declining groundwater levels may causes unsustainable vegetation； the Mu Us Sandy Land is more dependent on precipitation and the Horqin Sandy Land is more sensitive to groundwaterfor natural geographic differences. （4）The vegetation stability of two sandy areas is cyclical， varying from 2-24 years depending on local ground conditions.

Key words: vegetation stability, precipitation, groundwater, hydrologic balance

CLC Number:

Q948.1

Fanrui Bu, Ying Liu, Xueyong Zou, Chunlai Zhang. Vegetation sustainability in relation to water resources in typical sandy areas of eastern China[J]. Journal of Desert Research, 2024, 44(4): 111-125.

Figures/Tables 14

Fig.1 The location of the study areas， multi-year average vegetation coverage in the growing season （VCave） and time series of precipitation （P） and temperature during 2000-2020

Fig.2 Comparison of changes in groundwater depth between grid buffer zone and satellite retrieval grid

Fig.3 Distribution of groundwater observation points， and groundwater depth during the observation period

Fig.4 Monthly series of groundwater changes （GWs） in Mu Us Sandy Land and Horqin Sandy Land during April 2002 to June 2017

Fig.5 Spatial distribution of multi-year average intra-annual evaporation （ET，A and B）， and temporal variation （C and D） in Mu Us Sandy Land and Horqin Sandy Land， 2000-2020

Fig.6 Relationship between average vegetation coverage （VCave） in growing season and groundwater depth in that year of Mu Us Sandy Land and Horqin Sandy Land

Fig.7 Relationship between average vegetation coverage （VCave） in growing season and groundwater depth in the previous year of Mu Us Sandy Land and Horqin Sandy Land

Fig.8 Dynamic time series of average vegetation coverage （VCave） in the growing season and groundwater variation （GWs） in Mu Us Sandy Land （A） and Horqin Sandy Land （B）， 2000-2020

Fig.9 Mean spatial distribution of vegetation water demand （W） in growing season， monthly and monthly average vegetation water demand （W） in growing season in the statistical area unit of Mu Us Sandy Land and Horqin Sandy Land， 2000-2020

Fig.10 Time series variation of W， PA， ΔGA and PA-ΔGA in the raster buffer cells for observation of Mu Us Sandy Land （M1-M3） and Horqin Sandy Land （H1-H3， H6-H10， H14）

Fig.11 Correlation between W， PA， ΔGA and PA-ΔGA in the raster buffer cells for observation of Mu Us Sandy Land （M1-M3） and Horqin Sandy Land （H1-H3， H6-H10， H14）

Fig.12 Cyclical fit of vegetation water demand （W） in the growing season of the raster buffer cells for observation in Mu Us Sandy Land and Horqin Sandy Land

Fig.13 Vegetation stability and desertification in typical sandy lands of eastern China

Table 1 The range of parameters when the vegetation of raster buffer cells were stable

观测点	W/m³	VC/%	P/m³	地下水埋深/m
M₁	0.12~0.21	37~47	40~146	1.34~2.81
M₂	0.10~0.19	28~46	48~105	9.92~10.41
M₃	0.05~0.09	20~27	31~108	3.40~5.43
H₄	0.01~0.04	76~94	51~112	12.18~14.37
H₅	0.29~0.46	59~69	55~96	7.11~9.96
H₆	0.47~0.60	69~80	52~97	8.64~11.88
H₇	0.00~0.50	11~60	52~111	9.90~14.68
H₈	0.05~0.16	23~44	52~110	10.97~15.32
H₉	0.00~0.08	4~24	52~110	6.26~10.00
H₁₀	0.33~0.41	60~68	52~112	8.66~12.46
H₁₁	0.25~0.40	52~69	55~134	7.73~12.84
H₁₂	0.18~0.37	44~63	63~120	3.61~4.00
H₁₃	0.31~0.43	53~70	65~120	4.90~6.00
H₁₄	0.01~0.04	7~22	50~149	2.22~3.37

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