Variations in stem radii of Larix principis-rupprechtii to environmental factors at two slope locations in the Liupan Mountains,northwest China

作     者：Jing Ma Jianbin Guo Yanhui Wang Zebin Liu Di Gao Liu Hong Ziyou Zhang Jing Ma;Jianbin Guo;Yanhui Wang;Zebin Liu;Di Gao;Liu Hong;Ziyou Zhang

作者机构：School of Soil and Water ConservationBeijing Forestry UniversityBeijing 100083People’s Republic of China The Research Institute of Forest EcologyEnvironment and ProtectionChinese Academy of ForestryBeijing 100091People’s Republic of China 

出 版 物：《Journal of Forestry Research》 (林业研究（英文版）)

年 卷 期：2021年第32卷第2期

页      面：513-527页

核心收录：

学科分类：0907[农学-林学] 08[工学] 0829[工学-林业工程] 09[农学] 

基　　金：supported by the Ningxia Hui Autonomous Region(QCYL-2018-12) the National Key Research and Development Program of China(2016YFC0501603,2017YFC0504602) the National Natural Science Foundation of China(41671025) 

主　　题：Stem radial variations Main growth period Diurnal patterns Initiation temperatures Meteorological factors Larix principis-rupprechtii plantation 

摘      要：Relationships between stem growth and climatic and edaphic factors,notably air temperatures and soil moisture for different slopes,are not completely *** radial variations were monitored at the bottom and top slope positions in a Larix principis-rupprechtii plantation during the 2017 and 2018 growing *** precipitation during the growing season in 2017 and 2018 was 566 mm and 728 mm,*** contractions typically occurred after mid-morning followed by swelling in the late afternoon in both plots,reflecting the diurnal cycle of water uptake and *** at the two locations showed the same growth initiation(mid-May)because of the small differences in air and soil *** were no significant differences in cumulative stem radial growth between the bottom plot(1.57±0.34 mm)and the top plot(1.55±0.26 mm)in ***,in 2017,the main growth period of the bottom plot ceased 17 days earlier than in the top plot,while cumulative seasonal growth of the bottom plot(1.08±0.25 mm)was significantly less than the top plot(1.54±0.43 mm).Maximum daily stem shrinkage was positively correlated with air and soil temperatures,solar radiation,vapor pressure deficits,and negatively correlated with volumetric soil moisture *** maximum daily shrinkage reflected transpiration rates as affected by environmental *** radial stem increment was correlated with precipitation and volumetric soil moisture in both years,but with air temperatures only in *** seasonal growth of ***-rupprechtii Mayr thus shows interannual dynamics,while precipitation constitutes a key driving factor.