Environmental control on transpiration and its cooling effect of Ficus concinna in a subtropical city Shenzhen, southern China

Hayat, Muhammad Qasim; Xiang, Jing; Yan, Changrong; Xiong, Bowen; Wang, Bei; Qin, Lu; Saeed, Sajjad; Hussain, Altaf; Zou, Zhiyu; Qiu, Guo Yu

doi:10.1016/j.agrformet.2021.108715

Cited by 20 publications

(17 citation statements)

References 77 publications

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“…Generally, episodic precipitation events with large intra-and interannual fluctuations are common. Based on long-term meteorological data from the closest Xili Weather Station ~4.5 km from the PUSGS, the mean annual rainfall is approximately 1924.7 mm, on average 75% of which occurs in the growing seasons of each year [24]. The annual mean temperature is 23.3 • C, with the lowest monthly mean T a (i.e., 14.9 • C) occurring over the coldest month (January) and the highest (i.e., 28.6 • C) during the hottest month (July).…”

Section: Site Descriptions and Tree Speciesmentioning

confidence: 99%

“…Regarding large heterogeneous environmental conditions in the subtropical urban areas, the on-site hydrometeorological regulating parameters of Q n can be varied markedly within a very short interval, which might affect the nighttime water usage of plants differently across temporal scales [23,24]. Generally, air temperature (T a ), VPD, wind speed (W s ), precipitation (P), soil moisture content (SMC), and canopy conductance (as indicated by T/VPD) are the most important parameters influencing plant water fluxes and growth [25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

“…The previous researchers used different methods to determine in-depth plant water consumption rates, for example, lysimeter, gas analyzer, statistical models, and eddy covariance measurements [15,[38][39][40][41]. However, the measurement requirements for these methods are difficult in urban areas concerning the large heterogeneous microclimate, and the approaches might not accurately determine the real conditions [24,42]. The sap flow measurement approach has been considered more reliable for continuously and directly monitoring the whole tree water fluxes in situ [43,44].…”

Section: Introductionmentioning

confidence: 99%

“…The sap flow measurement approach has been considered more reliable for continuously and directly monitoring the whole tree water fluxes in situ [43,44]. Investigations on sap flow rates in trees of urban surroundings are valuable not only to enhance our comprehension of the physiological responses of trees to their hydrometeorological environment but also could help to acknowledge the procedure of water consumption, as well as provide direction to determine the tradeoffs between water supply and demand [24,45].…”

Section: Introductionmentioning

confidence: 99%

“…The F. concinna trees are commonly used for the greening of subtropical cities. Its plays a vital role in improving the ecological environment and mitigating UHI due to its higher transpiration rate, strong wind and high-temperature resistance, strong shade, large crown structure, and low soil requirements [24,47]. Our objectives of this investigation were to:…”

Section: Introductionmentioning

confidence: 99%

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Multiple-Temporal Scale Variations in Nighttime Sap Flow Response to Environmental Factors in Ficus concinna over a Subtropical Megacity, Southern China

Hayat

Yan

Xiang

et al. 2022

Forests

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With ongoing climate change and rapid urbanization, the influence of extreme weather conditions on long-term nocturnal sap flow (Qn) dynamics in subtropical urban tree species is poorly understood despite the importance of Qn for the water budgets and development plantation. We continuously measured nighttime sap flow in Ficus concinna over multiple years (2014–2020) in a subtropical megacity, Shenzhen, to explore the environmental controls on Qn and dynamics in plant water consumption at different timescales. Nocturnally, Qn was shown to be positively driven by the air temperature (Ta), vapor pressure deficit (VPD), and canopy conductance (expressed as a ratio of transpiration to VPD), yet negatively regulated by relative humidity (RH). Seasonally, variations in Qn were determined by VPD in fast growth, Ta, T/VPD, and meteoric water input to soils in middle growth, and RH in the terminal growth stages of the trees. Annual mean Qn varied from 2.87 to 6.30 kg d−1 with an interannual mean of 4.39 ± 1.43 kg d−1 (± standard deviation). Interannually, the key regulatory parameters of Qn were found to be Ta, T/VPD, and precipitation (P)-induced-soil moisture content (SMC), which individually explained 69, 63, 83, and 76% of the variation, respectively. The proportion of the nocturnal to the total 24-h sap flow (i.e., Qn/Q24-h × 100) ranged from 0.18 to 17.39%, with an interannual mean of 8.87%. It is suggested that high temperatures could increase transpirational demand and, hence, water losses during the night. Our findings can potentially assist in sustainable water management in subtropical areas and urban planning under increasing urban heat islands expected with future climate change.

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Section: Site Descriptions and Tree Speciesmentioning

confidence: 99%