文献类型：期刊文献

英文题名：Applicability of the Crop Water Stress Index Based on Canopy–Air Temperature Differences for Water Diagnosis in a Cork Oak Plantation, Northern China

作者：Liu, Linqi[1,2] Gao, Xiang[1,2] Ren, Chenghao[3] Cheng, Xiangfen[1,2] Zhou, Yu[1,2] Huang, Hui[1,2] Zhang, Jinsong[1,2]

第一作者：Liu, Linqi

机构：[1] Key Laboratory of Tree Breeding and Cultivation of State Forestry Administration, Research Institute of Forestry, Chinese Academy of Forestry, Xiangshan Road Dongxiaofu 1, Beijing, 100091, China; [2] Collaborative Innovation Center of Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing, 210037, China; [3] School of Transportation and Vehicle Engineering, Shandong University of Technology, Xincun West Road 266, Zibo, 255049, China

年份：2022

外文期刊名：SSRN

收录：EI(收录号：20220113606)

语种：英文

外文关键词：Atmospheric temperature - Crops - Ecosystems - Evapotranspiration - Forestry - Plant shutdowns - Plants (botany)

摘要：The crop water stress index based on canopy-air temperature differences (CWSIdT) is a good index for water diagnosis in croplands but is rarely used to quantify the water status of forest ecosystems. In this study, we selected a cork oak plantation in the rocky mountainous area of northern China as the research object and observed the canopy temperature, actual evapotranspiration (ETa), and meteorological factors of the plantation continuously and synchronously during the period of canopy closure in 2020 and 2021. Taking the crop water stress index based on the ratio of ETa to potential evapotranspiration (CWSIet) as a standard, the applicability of CWSIdT for water diagnosis in the plantation was evaluated. The results showed that canopy-air temperature differences (dT) were strongly affected by meteorological factors, and the net radiation on the canopy surface (Rnc) was the main factor affecting dT. With increasing Rnc, the warming effect of Rnc masked the cooling effect of latent heat on dT, resulting in a positive relationship between vapor pressure deficit (VPD) and dT and a failure establishment of the non-water-stressed baseline in the plantation. Therefore, the empirical CWSIdT (CWSIdTe), mainly based on VPD and dT, is not suitable for water diagnosis in this plantation. However, the theoretical CWSIdT (CWSIdTt ), based on the energy balance and Penman–Monteith equation, could capture daily variations in the water status in our plantation and showed a significant linear correlation with the measured relative available water content in the root zone (R2 = 0.5860) and CWSIet (R2 = 0.7504). The CWSIdTt showed an upward trend during the day, and midday (13:00-14:00) was the optimal time to measure dT for diagnosing the daily water status of the plantation. The CWSIdTt provides an effective, sensitive, and non-contact method of assessing daily water status changes in the cork oak plantation. ? 2022, The Authors. All rights reserved.