Inter-annual variation of water source of Ammopiptanthus mongolicus community on gobi

doi:10.7522/j.issn.1000-694X.2024.00101

Journal of Desert Research ›› 2025, Vol. 45 ›› Issue (1): 85-93.DOI: 10.7522/j.issn.1000-694X.2024.00101

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Inter-annual variation of water source of Ammopiptanthus mongolicus community on gobi

Aqing Wang¹(), Yajuan Zhu¹(), Yuan Ma², Fangchun Lin², Yun Li¹

^1.Research Center of Desertification Studies，Institute of Ecological Conservation and Restoration，Chinese Academy of Forestry，Beijing 100091，China
^2.Experimental Center of Desert Forestry，Chinese Academy of Forestry，Dengkou 015200，Inner Mongolia，China

Received:2024-07-15 Revised:2024-10-14 Online:2025-01-20 Published:2025-01-13
Contact: Yajuan Zhu

Abstract

Abstract:

In southern piedmont of Langshan Mountain， shrub branch and soil of gobi Ammopiptanthus mongolicus community were collected in the growing season of two years， analyzed by stable oxygen isotope to clarify the inter-annual dynamics of water sources. The results showed that： In 2021， A. mongolicus， Nitraria sphaerocarpa and Convolvulus tragacanthoides mainly used shallow and deep soil water after heavy rain in spring. During the drought event within summer， the first two shrubs mainly used deep soil water， whereas the latter shrub mainly used shallow and deep soil water. Three shrubs increasingly used shallow soil water in autumn. In 2022， A. mongolicus and Caragana korshinskii mainly used deep soil water in drought spring and autumn. Three shrubs mainly used shallow and deep soil water after heavy rain in summer. C. tragacanthoides mainly used shallow and deep soil water in spring， but it mainly used deep soil water in autumn. There was less rainfall in the growing seasons in 2021， A. mongolicus used more deep soil water. However， there was more rainfall in 2022， C. tragacanthoides used more shallow soil water. Both of N. sphaerocarpa and C. korshinskii competed deep soil water with A. mongolicus. Thus， there was inter-annual variation and inter-specific competition of water source in gobi A. mongolicus community.

Key words: gobi, Ammopiptanthus mongolicus community, water source, stable oxygen isotope

CLC Number:

Q948.1

Aqing Wang, Yajuan Zhu, Yuan Ma, Fangchun Lin, Yun Li. Inter-annual variation of water source of Ammopiptanthus mongolicus community on gobi[J]. Journal of Desert Research, 2025, 45(1): 85-93.

Figures/Tables 6

Table 1 Community characteristic of Ammopiptanthus mongolicus on gobi in 2021 and 2022 （mean ± SE）

年份	物种	高度 /cm	密度 /(株·m^-2)	盖度 /%
2021	沙冬青	68.72±9.02	0.17±0.07	16.25±1.70
	泡泡刺	42.57±7.83	0.02±0.01
	刺旋花	38.24±3.65	0.06±0.01
2022	沙冬青	69.75±9.42	0.16±0.01	14.75±2.06
	柠条锦鸡儿	95.00±17.87	0.02±0.01
	刺旋花	37.00±3.70	0.04±0.01

Fig.1 Daily precipitation in Dengkou Desert Ecological Station from March to September in 2021 and 2022

Fig.2 Stable oxygen isotope values of soil water and xylem water of Ammopiptanthus mongolicus community on gobi in the growing reason of 2021 （mean ± SE）

Fig.3 Stable oxygen isotope values of soil water and xylem water of Ammopiptanthus mongolicus community on gobi in the growing reason of 2022 （mean±SE）

Fig.4 Utilization rate of three shrubs of Ammopiptanthus mongolicus community to soil water with different depths on gobi in 2021 （mean ± SD）

Fig.5 Utilization rate of three shrubs of Ammopiptanthus mongolicus community to soil water with different depths on gobi in 2022 （mean±SD）

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Inter-annual variation of water source of Ammopiptanthus mongolicus community on gobi

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