Time-Lag Effect Between Sap Flow and Environmental Factors of <em>Larix principis-rupprechtii</em> Mayr

Liu Hong; Jianbin Guo; Zebin Liu; Yanhui Wang; Jing Ma; Xiao Wang; Ziyou Zhang

doi:10.3390/f10110971

Forests (Nov 2019)

Time-Lag Effect Between Sap Flow and Environmental Factors of <em>Larix principis-rupprechtii</em> Mayr

Liu Hong,
Jianbin Guo,
Zebin Liu,
Yanhui Wang,
Jing Ma,
Xiao Wang,
Ziyou Zhang

Affiliations

Liu Hong: College of Soil and Water Conservation, Beijing Forestry University, 35 East Qinghua Road, Beijing 100083, China
Jianbin Guo: College of Soil and Water Conservation, Beijing Forestry University, 35 East Qinghua Road, Beijing 100083, China
Zebin Liu: 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
Yanhui Wang: 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
Jing Ma: College of Soil and Water Conservation, Beijing Forestry University, 35 East Qinghua Road, Beijing 100083, China
Xiao Wang: 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
Ziyou Zhang: College of Soil and Water Conservation, Beijing Forestry University, 35 East Qinghua Road, Beijing 100083, China

DOI: https://doi.org/10.3390/f10110971
Journal volume & issue: Vol. 10, no. 11
p. 971

Abstract

Read online

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.

Published in Forests

ISSN: 1999-4907 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Science: Botany: Plant ecology
Website: http://www.mdpi.com/journal/forests/

About the journal

Abstract

Keywords