Responses and driving force analysis of typical arbor and shrub sap flow to patterns of rainfall in semi-arid areas

Tianyu Jia; Tingxi Liu; Yongzhi Bao; Limin Duan; Xin Tong; Yiran Zhang; Shuo Lun; Simin Zhang; Asaad Y. Shamseldin; Kilisimasi Latu; Vijay P. Singh

Ecological Indicators (Nov 2024)

Responses and driving force analysis of typical arbor and shrub sap flow to patterns of rainfall in semi-arid areas

Tianyu Jia,
Tingxi Liu,
Yongzhi Bao,
Limin Duan,
Xin Tong,
Yiran Zhang,
Shuo Lun,
Simin Zhang,
Asaad Y. Shamseldin,
Kilisimasi Latu,
Vijay P. Singh

Affiliations

Tianyu Jia: Inner Mongolia Agricultural University Water Conservancy and Civil Engineering College, 010018 Hohhot, China
Tingxi Liu: Inner Mongolia Agricultural University Water Conservancy and Civil Engineering College, 010018 Hohhot, China; Inner Mongolia Key Laboratory of Ecohydrology and High-Efficient Utilization of Water Resources, Hohhot 010018, China; Autonomous Region Collaborative Innovation Center for Integrated Management of Water Resources and Water Environment in the Inner Mongolia Reaches of the Yellow River, Hohhot 010018, China; Corresponding author at: Inner Mongolia Agricultural University Water Conservancy and Civil Engineering College, 010018 Hohhot, China.
Yongzhi Bao: Inner Mongolia Agricultural University Water Conservancy and Civil Engineering College, 010018 Hohhot, China; Inner Mongolia Key Laboratory of Ecohydrology and High-Efficient Utilization of Water Resources, Hohhot 010018, China; Autonomous Region Collaborative Innovation Center for Integrated Management of Water Resources and Water Environment in the Inner Mongolia Reaches of the Yellow River, Hohhot 010018, China
Limin Duan: Inner Mongolia Agricultural University Water Conservancy and Civil Engineering College, 010018 Hohhot, China; Inner Mongolia Key Laboratory of Ecohydrology and High-Efficient Utilization of Water Resources, Hohhot 010018, China; Autonomous Region Collaborative Innovation Center for Integrated Management of Water Resources and Water Environment in the Inner Mongolia Reaches of the Yellow River, Hohhot 010018, China
Xin Tong: Inner Mongolia Agricultural University Water Conservancy and Civil Engineering College, 010018 Hohhot, China; Inner Mongolia Key Laboratory of Ecohydrology and High-Efficient Utilization of Water Resources, Hohhot 010018, China; Autonomous Region Collaborative Innovation Center for Integrated Management of Water Resources and Water Environment in the Inner Mongolia Reaches of the Yellow River, Hohhot 010018, China
Yiran Zhang: Inner Mongolia Agricultural University Water Conservancy and Civil Engineering College, 010018 Hohhot, China
Shuo Lun: Inner Mongolia Agricultural University Water Conservancy and Civil Engineering College, 010018 Hohhot, China
Simin Zhang: Inner Mongolia Agricultural University Water Conservancy and Civil Engineering College, 010018 Hohhot, China
Asaad Y. Shamseldin: Department of Civil and Environmental Engineering, The University of Auckland, Auckland 1010, New Zealand
Kilisimasi Latu: Department of Civil and Environmental Engineering, The University of Auckland, Auckland 1010, New Zealand
Vijay P. Singh: Department of Biological and Agricultural Engineering & Zachry Department of Civil Engineering, Texxas A& M University, College Station, TX 77843, USA

Journal volume & issue: Vol. 168
p. 112803

Abstract

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Understanding plant transpiration responses to rainfall in semi-arid regions is vital for grasping climate change impacts on ecohydrological processes. This study categorized 105 rainfall events in Horqin Sandy Land (2018–2019) into three types: Category I (short-term, light rain), Category II (short-term, heavy rain), and Category III (long-term, moderate rain). It focused on Caragana microphylla Lam. (a sand-fixing shrub) and Populus L. (arbors), analyzing sap flow (SF), photosynthesis, and meteorological data. SF rates in both species were primarily influenced by net solar radiation (Rn), air temperature (Ta), relative humidity (RH), and vapor pressure deficit (VPD) (P < 0.05). The analysis indicated that potential evapotranspiration (PET) can be used as a composite influencing factor to explain the changes in SF. The results showed that under different rainfall types, the changing trends of SF and PET of Populus L. were generally consistent, However, as rainfall intensity increased, the effect of PET on SF of Populus L. weakened. Conversely, the effect of PET on the SF rate of Caragana microphylla Lam. increased with the increase of rainfall intensity. Notably, whether the SWC at the two test sites is effectively recharged or oversaturated due to rainfall is also an important factor affecting SF. Specifically, the SF of Caragana microphylla Lam. is generally affected by the combined effects of PET and stomatal conductance (Gs); when SWC is less than the field capacity, the inhibitory effect of Gs is obvious; when SWC exceeds field capacity, the inhibitory effect of Gs is significantly reduced, and the SF of Caragana microphylla Lam. is mainly controlled by PET. In contrast, as the SF of Populus L. increases from the field capacity to the saturated water holding capacity of SWC, the influence of PET on the SF of Populus L. weakens, and the influence of Gs on SF becomes more prominent.

Published in Ecological Indicators

ISSN: 1470-160X (Print); 1872-7034 (Online)
Publisher: Elsevier
Country of publisher: United Kingdom
LCC subjects: Science: Biology (General): Ecology
Website: https://www.sciencedirect.com/journal/ecological-indicators

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