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| 1 | 新疆伊犁与哈萨克斯坦新疆野苹果〔Malus sieversii (Ledeb.) Roem.〕种群年龄结构显示文摘人类活动和自然环境的胁迫加速了中亚地区新疆野苹果〔Malus sieversii (Ledeb.) Roem.〕种群栖息环境的丧失,新疆野苹果种群面积和生存力趋于下降。本文以第三纪孑遗植物新疆野苹果为研究对象,野外系统调查新疆野苹果种群的生存现状,比较新疆伊犁和哈萨克斯坦分布的新疆野苹果种群年龄结构及果实产量,对两地当前新疆野苹果种群变化进行了分析。研究结果显示:当前伊犁地区和20世纪70年代哈萨克斯坦新疆野苹果种群的龄级结构主要以中龄(1550 cm)树为主,而幼龄(015 cm)与老龄(5075 cm)树较少。1969年和1970年哈萨克斯坦的新疆野苹果种群生存力最弱,种群为衰退型(Deevey-Ⅲ),但其产量较高;2016年和2017年伊犁的新疆野苹果种群生存力相对较弱,种群趋于衰退(Deevey-Ⅲ),产量较低;2013年哈萨克斯坦新疆野苹果种群生存力相对最强,种群最稳定(Deevey-Ⅱ);幼龄个体的缺乏是新疆野苹果种群趋于衰退的关键因子。目前,在哈萨克斯坦新疆野苹果保护区内需进行适当放牧干扰,以扩大种子的传播,提高种子的萌发;新疆地区以建立保护区为主,杜绝新疆野苹果的采收和降低野果林内的割草强度,以保护幼苗的生存数量,提高新疆野苹果的种子库,加快新疆野苹果种群更新。 | 张苹 吕昭智 张鑫 赵想平 张永光 Gulzhanat Tanabekova Maisupova Bagila Adilbayeva Zhanera 崔志军 | 2019 | 干旱区研究2019，36，4： | 12 |
| 2 | 哈萨克斯坦阿尔泰山树木径向生长及其对气候要素的响应显示文摘针对哈萨克斯坦阿尔泰山南坡西伯利亚云杉(Picea obovata)和西伯利亚落叶松(Larix sibirica)开展树轮研究,建立树轮年表,计算年平均树轮宽度值和年平均断面积生长量(BAI),并分析在1988年发生升温突变前后,这2个树种树轮宽度指数变化趋势,及其树木径向生长对气候因子的响应。结果表明:在升温突变前后,2个树种树轮宽度指数变化趋势一致。但是,在升温突变后,其变化趋势均由不显著增加转为显著下降。即树木径向生长减缓;升温突变后,2个树种树木径向生长对降水的响应有所减弱,而对气温的响应有所增强,并且发生了树轮指数和气候因子间相关性'正负转换'的情况。 | 刘蕊 王勇辉 姜盛夏 张瑞波 秦莉 Bulkajyr T.Mambetov Nurzhan Kelgenbayev Daniyar Dosmanbetov Bagila Maisupova 张同文 | 2019 | 干旱区研究2019，36，3： | 9 |
| 3 | Spatiotemporal variations in the growth status of declining wild apple trees in a narrow valley in the western Tianshan Mountains, China显示文摘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 apples.However,existing natural populations of wild apple trees have been declining.To 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 unclear.In 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,China.Projective 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 trees.The values of dead branch percentage ranged from 36%to 59%,with a mean of 40%.Year generally showed higher impact on plant traits than elevation.In 2017 and 2018,projective coverage,leaf size,leaf nitrogen concentration,and nitrogen to phosphorous ratio were markedly higher than those in 2016.However,dead branch percentage and leaf and stem phosphorous concentrations showed the opposite trend.Most of the topological parameters of plant trait networks differed in the three years,but the strength of trait-trait association increased year by year.The 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 matrix.The growth status of declining wild apple trees was directly and positively affected by MDT and leaf size.In conclusion,the growth of declining wild apple trees distributed in the narrow valley areas was more sensitive to interannual environmental changes than elevation changes.The results are of great significance for further revealing the decline mechanism of wild apple trees in the Tianshan Mountains. | QIU Dong TAO Ye ZHOU Xiaobing Bagila MAISUPOVA YAN Jingming LIU Huiliang LI Wenjun ZHUANG Weiwei ZHANG Yuanming | 2022 | Journal of Arid Land2022，14，12： | 0 |
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