Effects of heterogeneous habitats on phenotypic plasticity of <i>Artemisia scoparia</i> in the desert steppe of China

Lin, 陈林 Chen; Ying, 苏莹 Su; Yuefei, 李月飞 Li; Lina, 杨丽娜 Yang; Lei, 王磊 Wang; Naiping, 宋乃平 Song; Xinguo, 杨新国 Yang; Yingying, 卞莹莹 Bian; Zhongyou, 祝忠有 Zhu; Wenting, 孟文婷 Meng; Juan, 陈娟 Chen

doi:10.5846/stxb201803150512

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“…In the dry season, C. intermedia sprouts earlier than A. scoparia (Liang et al, 2008), and has chances to use the deeper soil water coming from the storage of precipitation in the late autumn (Niu et al, 2003;Lu et al, 2017). However, the early growth of A. scoparia mainly occurs in the roots as an annual plant (Chen et al, 2019), and its soil water use gradually increases in layer. Therefore, there may not be many opportunities for the fine roots of the two plants to directly interact in the early dry season.…”

Section: Seasonal Water Use Patterns Of Coexisting Plantsmentioning

confidence: 99%

“…However, in desert steppes with the precipitation of around 300 mm where shrub (C. intermedia) has been replanted to restore sandy grassland, the shrub has remained the dominant species for more than 40 a without a significant increase in plant diversity (Yang et al, 2015). As a result, a binary vegetation structure dominated by the shrub and grass (A. scoparia) is common in the region (Zhao et al, 2015;Chen et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

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Biocrust-induced partitioning of soil water between grass and shrub in a desert steppe of Northwest China

et al. 2023

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Maintaining the stability of exotic sand-binding shrub has become a large challenge in arid and semi-arid grassland ecosystems in northern China. We investigated two kinds of shrublands with different BSCs (biological soil crusts) cover in desert steppe in Northwest China to characterize the water sources of shrub (Caragana intermedia Kuang et H. C. Fu) and grass (Artemisia scoparia Waldst. et Kit.) by stable 18 O isotopic. Our results showed that both shrublands were subject to persistent soil water deficiency from 2012 to 2017, the minimum soil depth with CV (coefficient of variation) <15% and SWC (soil water content) <6% was 1.4 m in shrubland with open areas lacking obvious BSC cover, and 0.8 m in shrubland covered by mature BSCs. For C. intermedia, a considerable proportion of water sources pointed to the surface soil. Water from BSCs contributed to averages 22.9% and 17.6% of the total for C. intermedia and A. scoparia, respectively. C. intermedia might use more water from BSCs in rainy season than dry season, in contrast to A. scoparia. The relationship between shrub (or grass) and soil water by δ 18 O shown significant differences in months, which partly verified the potential trends and relations covered by the high variability of the water source at seasonal scale. More fine roots at 0-5 cm soil layer could be found in the surface soil layer covered by BSCs (8000 cm/m 3 ) than without BSCs (3200 cm/m 3 ), which ensured the possibility of using the surface soil water by C. intermedia. The result implies that even under serious soil water deficiency, C. intermedia can use the surface soil water, leading to the coexistence between C. intermedia and A. scoparia. Different with the result from BSCs in desert areas, the natural withdrawal of artificial C. intermedia from desert steppe will be a long-term process, and the highly competitive relationship between shrubs and grasses also determines that its habitat will be maintained in serious drought state for a long time.

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Section: Seasonal Water Use Patterns Of Coexisting Plantsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%