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Open AccessArticle

Time-Lag Effect Between Sap Flow and Environmental Factors of Larix principis-rupprechtii Mayr

1
College of Soil and Water Conservation, Beijing Forestry University, 35 East Qinghua Road, Beijing 100083, China
2
Key Laboratory of Forestry Ecology and Environment of the State Forestry Administration of China, Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing 100091, China
*
Author to whom correspondence should be addressed.
Forests 2019, 10(11), 971; https://doi.org/10.3390/f10110971
Received: 25 August 2019 / Revised: 22 October 2019 / Accepted: 30 October 2019 / Published: 3 November 2019
(This article belongs to the Special Issue Water Cycling and Drought Responses of Forest Ecosystems)
A time lag between sap flux density (Js) and meteorological factors has been widely reported, but the controlling factors of the time lag are poorly understood. To interpret the time lag phenomenon systematically, thermal dissipation probes were placed into each of eight trees to measure the Js of Larix principis-rupprechtii Mayr. in the Liupan Mountains in Northwest China. Meteorological factors, including vapor pressure deficit (VPD), solar radiation (Rs) and air temperature (Ta), were synchronously measured with Js, and the dislocation contrast method was used to analyze the time lag between Js and the meteorological factors. The analysis indicated the following for the whole experimental period. (1) The time lag between Js and VPD (TLV) and the time lag between Js and Rs (TLR) both exhibited different patterns under different weather conditions, and Js could precede Rs on dry days. (2) Both TLV and TLR varied with the day of the year (DOY) throughout the experimental period; namely, both exhibited a decreasing tendency in September. (3) Reference crop evapotranspiration (ETref) had a greater influence on the time lag than the other meteorological factors and directly controlled the length and direction of TLV and TLR; relative extractable water (REW) modified the relationship between ETref and time lag. (4) The regression analysis results showed differences between the time lags and the environmental factors (ETref and REW) within different ranges of REW. Namely, TLR was better determined by ETref and REW when REW < 0.38, while TLV was better correlated with ETref and REW in the absence of soil water limitations (REW > 0.38). This project provided an important opportunity to advance the understanding of the interaction between plant transpiration and meteorological factors in a changing climate. View Full-Text
Keywords: Time lag; hysteresis; transpiration; Larix principis-rupprechtii Mayr Time lag; hysteresis; transpiration; Larix principis-rupprechtii Mayr
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Hong, L.; Guo, J.; Liu, Z.; Wang, Y.; Ma, J.; Wang, X.; Zhang, Z. Time-Lag Effect Between Sap Flow and Environmental Factors of Larix principis-rupprechtii Mayr. Forests 2019, 10, 971.

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