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Spatiotemporal variations in the growth status of declining wild apple trees in a narrow valley in the western Tianshan Mountains, China

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Journal of Arid Land 2022年第12期14卷 1413-1439页

作者： QIU Dong TAO Ye ZHOU Xiaobing Bagila MAISUPOVA YAN Jingming LIU Huiliang LI Wenjun ZHUANG Weiwei ZHANG Yuanming Xinjiang Key Laboratory of Special Species Conservation and Regulatory Biology/Key Laboratory of Special Environment Biodiversity Application and Regulation in Xinjiang/Key Laboratory of plant Stress Biology in Arid Land/College of Life Sciences Xinjiang Normal UniversityUrumqi 830054China State Key Laboratory of Desert and Oasis Ecology Xinjiang Institute of Ecology and GeographyChinese Academy of SciencesUrumqi 830011China Kazakh Scientific Research Institute of Forestry and Agroforestry Astana 010000Kazakhstan

Malus sieversii(wild apple tree),only distributed in the Tianshan Mountains in Central Asia,is a tertiary relic species and an ancestral species of cultivated ***,existing natural populations of wild apple trees have been *** date,spatiotemporal variations in the growth status of declining wild apple trees and influencing factors in the narrow valley areas in the Tianshan Mountains remain *** this study,field investigation and sampling were carried out in three years(2016-2018)at four elevations(1300,1400,1500,and 1600 m)in the Qiaolakesai Valley(a typical longitudinal narrow valley in the Yili River Valley)of the western Tianshan Mountains in Xinyuan County,Xinjiang Uygur Autonomous Region,*** coverage,dead branch percentage,and 18 twig traits(these 20 parameters were collectively referred to as plant traits)were determined to comprehensively reflect the growth status of declining wild apple *** values of dead branch percentage ranged from 36%to 59%,with a mean of 40%.Year generally showed higher impact on plant traits than *** 2017 and 2018,projective coverage,leaf size,leaf nitrogen concentration,and nitrogen to phosphorous ratio were markedly higher than those in ***,dead branch percentage and leaf and stem phosphorous concentrations showed the opposite *** of the topological parameters of plant trait networks differed in the three years,but the strength of trait-trait association increased year by *** mean difference between day and night temperatures(MDT),annual accumulative precipitation,soil electrical conductivity,and soil pH had the greatest impact on the plant trait *** growth status of declining wild apple trees was directly and positively affected by MDT and leaf *** conclusion,the growth of declining wild apple trees distributed in the narrow valley areas was more sensitive to interannual environmental changes than elevation *** results are of great significa

关键词： Malus sieversii plant attributes plant trait network elevation gradient meteorological factor western Tianshan Mountains

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