The responses of three dominant species to increased rainfall under different grazing systems in a desert steppe

Song, Yifan; Liu, Tiejun; Wang, Jing; Lu, Yajing; Guo, Jianying; Zhi, Dong; Wen, Yunhao; Zhang, Pei

doi:10.1002/hyp.14632

Cited by 6 publications

(2 citation statements)

References 83 publications

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“…Previous studies have shown that black locust was relatively sensitive to temporary soil moisture changes by rainfall [ 33 ]. The fluctuation of soil water content caused by rainfall could significantly affect plant photosynthesis [ 44 , 45 ]. Our study also found that gas exchange parameters in the treated plot were significantly improved after rainfall (period II), and photosynthetic parameters were not significantly different between plots.…”

Section: Discussionmentioning

confidence: 99%

Effects of Rainfall Exclusion Treatment on Photosynthetic Characteristics of Black Locust in the Sub-Humid Region of the Loess Plateau, China

Guo,

Wang,

et al. 2024

Plants

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The mesic-origin species Robinia pseudoacacia L. (black locust) is widely planted in the semiarid and sub-humid areas of the Loess Plateau for the reforestation of vegetation-degraded land. Under the scenario of changing precipitation patterns, exploring the response of photosynthesis to drought allows us to assess the risk to sustainable development of these plantations. In this study, paired plots were established including the control and a treatment of 30% exclusion of throughfall (since 2018). The photosynthetic characteristics were investigated using a portable photosynthesis system for four periods in the full-leaf growing season of 2021–2022, the fourth and fifth years, on both treated and controlled sampling trees. Leaf gas exchange parameters derived from diurnal changing patterns, light response curves, and CO2 response curves showed significant differences except for period II (9–11 September 2021) between the two plots. The photosynthetic midday depression was observed in 2022 in the treated plot. Meanwhile, the decline of net photosynthetic rate in the treated plot was converted from stomatal limitation to non-stomatal limitation. Furthermore, we observed that black locust adapted to long-term water deficiency by reducing stomatal conductance, increasing water use efficiency and intrinsic water use efficiency. The results demonstrate that reduction in precipitation would cause photosynthesis decrease, weaken the response sensitivity to light and CO2, and potentially impair photosynthetic resilience of the plantations. They also provide insights into the changes in photosynthetic functions under global climate change and a reference for management of plantations.

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Section: Discussionmentioning

confidence: 99%

Effects of Rainfall Exclusion Treatment on Photosynthetic Characteristics of Black Locust in the Sub-Humid Region of the Loess Plateau, China

Guo,

Wang,

et al. 2024

Plants

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“…The analysis of stable hydrogen and oxygen isotopes provides accurate and non‐destructive approach for studying plants' water use patterns and eco‐hydrological processes (Grossiord et al, 2017; Zhou et al, 2021). Since water absorption by roots typically does not result in fractionation (Ellsworth & Williams, 2007), plant water sources can be identified by comparing the isotopic compositions ( 2 H and 18 O) in xylem water and all potential water sources (Ehleringer et al, 1991; Song, Liu, et al, 2022; Wang et al, 2017; Wu et al, 2022). Both δ 2 H and δ 18 O have been widely used to identify water use characteristics and water source relationships in coexisting species in vegetation restoration (Dai et al, 2014; Dodd et al, 1998; Ehleringer et al, 1991; Yang et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Water use characteristics of coexisting sand‐binding vegetation in two typical soil habitats in the desert steppe of China

Chen,

Yang

et al. 2024

Hydrological Processes

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Understanding the water use characteristics and water relationship of coexisting vegetation in a mixed‐species plantation of trees and shrubs is crucial for the sustainable restoration of degraded arid areas. This study investigated the water use characteristic of coexisting sand‐binding vegetation combinations in the sierozem habitat (Populus przewalskii Maxim namely Populus‐S and Caragana liouana) and aeolian sandy soil habitats (Populus przewalskii Maxim namely Populus‐A and Salix psammophila) of the desert steppe. By analysing the δ2H and δ18O isotopes in xylem, soil water, groundwater and precipitation, a Bayesian MixSIAR model was employed to quantitatively assess the water utilization characteristics of plants. Throughout the growing season, in the sierozem habitat, C. liouana exhibits the highest efficiency in utilizing soil moisture above 60 cm (53.45%) and displays adaptable water use strategies. In contrast, Populus‐A predominantly relies on deep soil moisture below 60 cm plus groundwater (63.89%). In the aeolian sandy soil habitat, both Populus‐A and S. psammophila similarly favour deep soil moisture below the 60 cm soil plus groundwater (66.77% and 67.60%, respectively). During the transition period from the dry to the wet seasons, although both Populus‐A and S. psammophila in the aeolian sandy soil habitat shifted their water sources from deeper to shallower ones, there was considerable overlap in the water sources used by Populus‐A and S. psammophila. This overlap led to competition for water resources and exacerbated the depletion of deep soil moisture in both seasons. Conversely, in the sierozem habitat, the partitioning of water sources between Populus‐S and C. liouana facilitated the allocation and utilization of water resources between the two species. The findings highlight the need for species‐specific consideration in water resource allocation within mixed‐species plantations of trees and shrubs, which is crucial for sustainable vegetation restoration in sand‐binding ecosystems.

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Regulatory effects of non-growing season precipitation on the community structure, biomass allocation, and water-carbon utilization in a temperate desert steppe

Song,

Yan,

et al. 2024

Journal of Hydrology

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The responses of three dominant species to increased rainfall under different grazing systems in a desert steppe

Cited by 6 publications

References 83 publications

Effects of Rainfall Exclusion Treatment on Photosynthetic Characteristics of Black Locust in the Sub-Humid Region of the Loess Plateau, China

Effects of Rainfall Exclusion Treatment on Photosynthetic Characteristics of Black Locust in the Sub-Humid Region of the Loess Plateau, China

Water use characteristics of coexisting sand‐binding vegetation in two typical soil habitats in the desert steppe of China

Regulatory effects of non-growing season precipitation on the community structure, biomass allocation, and water-carbon utilization in a temperate desert steppe

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