Environmental and physiological controls on sap flow in a subhumid mountainous catchment in North China

Tie, Qiang; Hu, Hongchang; Guan, Huade; Lin, Henry

doi:10.1016/j.agrformet.2017.03.018

Cited by 89 publications

(81 citation statements)

References 63 publications

(141 reference statements)

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“…Interestingly, the dominant anti‐clockwise directions of the loops between Js and Ta and VPD in this study were different from many previous studies such as O'Grady et al (), Matheny et al (), Bai et al (, ), and Tie et al (), where clockwise loops were presented. In these studies, it has been argued that the hysteresis was a water conservation or self‐protection mechanism through stomatal control.…”

Section: Discussioncontrasting

confidence: 99%

“…A linearity between Ec and meteorological variables at the daily scale was evident in this study as also in others (Eller et al, ; Tie et al, ). The breakdown of that linearity at the hourly scale can be mainly attributed to the hysteresis between Js and controlling factors.…”

Section: Discussionsupporting

confidence: 91%

“…Regarding the meteorological controls on plant water use, many studies have found fairly good linear relationships at the daily scale between transpiration and radiation and vapour pressure deficit ( VPD ), which are two major controlling factors as shown recently, for example, for plants in a desert‐oasis wetland of northwest China (Liu, Zhao, Wen, & Zhang, ), Scots pine in a boreal, humid Scottish catchment (Wang, Tetzlaff, Dick, & Soulsby, ), and tropical montane cloud forest in São Paulo Brazil (Eller, Burgess, & Oliveira, ). However, at the sub‐daily scale (i.e., hourly), the linear relationships between Ec and environmental variables have been shown to be weaker in most studies (Ma et al, ; Tie, Hu, Tian, Guan, & Lin, ; Wang et al, ). It is worth noting that because time lags have been found between transpiration from leaves and sap flow in the xylem, which vary among plant species (Goldstein et al, ; Kume, Komatsu, Kuraji, & Suzuki, ), environmental controls on sub‐daily plant water use are often examined using xylem sap flow or sap flux ( Js ) as a proxy when transpiration from leaves is not directly measured (Aranda, Forner, Cuesta, & Valladares, ).…”

Section: Introductionmentioning

confidence: 99%

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Hysteretic response of sap flow in Scots pine (Pinus sylvestris) to meteorological forcing in a humid low‐energy headwater catchment

2019

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Transpiration mediated by physiology is driven by the meteorological variables.Understanding their relationships is crucial to advancing terrestrial ecohydrological studies. Here, we used sap flow measurements in Scots pine to examine the temporal responses of transpiration to temperature (Ta), vapour pressure deficit (VPD), and net radiation (Rn). Seasonal variations and the hysteresis between sap flux density (Js) and meteorological variables were investigated. The results show that VPD and Rn were dominant factors influencing hourly Js. Daily peaks of Js lagged behind peaks of Ta, VPD, and Rn, by~2-4 hr. Anticlockwise hysteresis loops between Js and Ta and VPD were observed, and the size of loops change with prevailing weather conditions (i.e., rainy or rainless) and seasons. Longer time lags were found in April and September than in other months. The hysteresis is partly related to the low energy, humid nature of the site which resulted in limited moisture stress to the trees, and thus the trees did not necessarily need a conservation mechanism to restrict water loss as proposed by other studies in semi-arid areas. Release and refill of trunk water storage could plausibly contribute to the hysteresis, although the effect may be entwined with atmospheric demand making it difficult to separate without sophisticated measurements. This study highlights the diversity in plant water relations across temporal scales and seasons and calls for more work across geographic locations and climates.

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Section: Discussioncontrasting

confidence: 99%

Section: Discussionsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

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Hysteretic response of sap flow in Scots pine (Pinus sylvestris) to meteorological forcing in a humid low‐energy headwater catchment

2019

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“…In such a situation, the potential canopy transpiration is constrained by environmental conditions rather than plant physiological factors and thus the T/ET ratio is insensitive to the variation in NDVI. A similar pattern was found by Tie [50] during an assessment of the relationship between LAI and sap flow density (SFD), which concluded that there is a threshold effect associated with the controlling impact of LAI on SFD.…”

Section: Relationship Between T/et Ratio and Vegetationsupporting

confidence: 73%

“…Xitaizi is located in the headwater area of Miyun Reservoir, the drinking water source for Beijing, China. This site has a continental monsoon sub-humid continental climate, with a hot/humid summer and a cold/dry winter [50]. The annual precipitation is about 541.0 mm and the annual average temperature is 7.5 • C. This site is covered by mixed deciduous forest with aspen (Populusdavidiana) as the major species.…”

Section: Introductionmentioning

confidence: 99%

Comparison of the Vegetation Effect on ET Partitioning Based on Eddy Covariance Method at Five Different Sites of Northern China

Chen

Liu

et al. 2018

Remote Sensing

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Vegetation exerts profound influences on evapotranspiration (ET) partitioning. Many studies have demonstrated the positive impact of vegetation cover on the ratio of transpiration (T) to ET. Whether it is universally true with regard to different vegetation types and different sites is understudied. In this study, five sites in Northern China with different vegetation types were selected for comparison study. ET partitioning is conducted using an approach based on the concept of the underlying water use efficiency with eddy covariance measurements. The results show various patterns of vegetation's effects over ET partitioning and, when compared with existing studies, also reveal a new relationship between the T/ET ratio and Normalized Difference Vegetation Index (NDVI) at some of the sites. At the alpine meadow site, the T/ET ratio gradually increase when NDVI is low and rapidly increase as NDVI go beyond a certain value, whereas at the arid shrub site, the T/ET ratio rapidly increase when NDVI is low and plateaus at a certain value when NDVI reaches a relatively high value. In deciduous forest, the T/ET ratio becomes unresponsive to NDVI beyond a threshold value. This study also reveals that irrigation schemes play a major role in determining the correlation between the T/ET ratio and NDVI because the T/ET ratio becomes well correlated with NDVI in case of flood irrigation and irrelevant to NDVI in the case of mulch drip irrigation. Furthermore, this study helps us to understand ET partitioning under different sites and different human activities such as irrigation. These findings can help policymakers to better understand the connection between vegetation and climate change or human activities and provide significant information for water management policy. partitioning owing to the fact that transpiration accounts for the major portion of ET and is intrinsically linked to photosynthesis or plant productivity [7,8]. Furthermore, how vegetation responds to climate change is complex, particularly under climate extremes such as drought, which makes the relationship between vegetation and ET partitioning more complicated [9,10].Previously, many efforts have been devoted to investigating the relationship between vegetation and ET partitioning on different spatial and temporal scales [11][12][13][14]. It has been reported that the T/ET ratio fluctuates among different vegetation types [15] and normally increases from grass to shrub to trees. For instance, Moran et al.[16] estimated the T/ET ratio in a grassland and shrub site within the Walnut Gulch Experimental Watershed in southeast Arizona, USA. The outcomes showed that T/ET is higher for the grass-dominated site compared to the shrub-dominated site. Furthermore, some studies also revealed that the T/ET ratio is higher for deep-rooted trees as compared to grasses. Apart from vegetation type, ET partitioning is also significantly associated with vegetation index. The majority of studies in the past stated that T/ET ratio is positively correlated to leaf area index ...

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Water use characteristics of the artificial forests black locust (Robinia pseudoacacia) and Chinese pine (Pinus tabulaeformis) on the Loess Plateau of China

Wang

Jiang

et al. 2023

Ecohydrology

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The broad leaf, deciduous black locust (Robinia pseudoacacia) and needle leaf, evergreen Chinese pine (Pinus tabulaeformis) are the major afforestation species on the Loess Plateau of China, accounting for 29.5% and 15.9% of the afforestation area, respectively. The decay of black locust and drying of the forest land soil in this region have caused serious concerns among scientific community and local management authorities. Understanding the hydrological characteristics of the afforestation plantation may provide clues for choosing proper species. However, previous studies demonstrated diverse or even contradictory understandings due to incomplete observations of the water balance. We used a model to reconstruct the water balance based on 5 years (2015-2019) of incomplete soil water and transpiration observations at the field for these two species. The R-squares of linear regression analysis of simulated and observed soil water in black locust and Chinese pine plantations were 0.69 and 0.90, respectively; and transpiration was 0.62 and 0.69, respectively.Based on the reconstructed water balance components, we found that (1) black locust and Chinese pine had similar annual evapotranspiration in quantity. However, the Chinese pine transpired less and evaporated more water from the canopy than the black locust, with their ratios to the annual precipitation 50.7% and 69.7%, 26.3% and 17.2%, respectively; (2) the Chinese pine has higher evapotranspiration than the black locust in the non-growing season, accounting for 19.5% and 9.2% of the annual evapotranspiration, respectively; and (3) the Chinese pine is more tolerable to soil water drought than black locust. The findings may suggest that the Chinese pine is a more favourable species for afforestation than the black locust from the point view of drought resistance in this region.

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Environmental and physiological controls on sap flow in a subhumid mountainous catchment in North China

Cited by 89 publications

References 63 publications

Hysteretic response of sap flow in Scots pine (Pinus sylvestris) to meteorological forcing in a humid low‐energy headwater catchment

Hysteretic response of sap flow in Scots pine (Pinus sylvestris) to meteorological forcing in a humid low‐energy headwater catchment

Comparison of the Vegetation Effect on ET Partitioning Based on Eddy Covariance Method at Five Different Sites of Northern China

Water use characteristics of the artificial forests black locust (Robinia pseudoacacia) and Chinese pine (Pinus tabulaeformis) on the Loess Plateau of China

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