海拔高度对中国沙棘水碳代谢和生长的影响——以关帝山区为例

Abstract

PDF HTML阅读 XML下载 导出引用 引用提醒 海拔高度对中国沙棘水碳代谢和生长的影响——以关帝山区为例 DOI: 10.5846/stxb202111193260 作者: 作者单位: 作者简介: 通讯作者: 中图分类号: 基金项目: 山西省重点研发计划项目（201903D221051）；山西省自然科学基金项目（2019D211360）；北方功能油料树种培育与研发山西省重点实验室（201805D111010） Effects of altitude on water and carbon metabolism and growth of hippophae rhamnoides in Guandi Mountain Author: Affiliation: Fund Project: 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:海拔是影响中国沙棘自然分布和生长的的重要环境因子，水分代谢和碳代谢的平衡是植物存活和生长的基础，研究海拔对中国沙棘的水碳代谢和生长的影响有利于全面了解中国沙棘对海拔高度的适应性及其生理机制。以山西西部关帝山地区野生中国沙棘为研究对象，测定了海拔1100-2100 m的中国沙棘雌株在6月和8月的小枝正午水势、枝条导水损失率、枝条导管直径和导管密度、光合作用、不同部位非结构性碳水化合物（NSC）浓度，同时测定了不同海拔沙棘的株高和冠幅。结果表明：随着海拔的升高，6月和8月的土壤含水量均呈增加趋势；小枝正午水势先升高后降低；枝条导水损失率在6月先降低后升高；随着海拔的升高沙棘的导管直径没有显著性变化，但导管密度、枝条最大比导水率、叶面积呈现先升高后降低的趋势。随着海拔的升高6月和8月光合速率均呈增加趋势；根和叶NSC含量没有较大幅度变化；随着海拔高度的增加中国沙棘树高和冠幅均呈现先增加后降低的趋势。以上结果表明：低海拔（1100-1300 m）和高海拔（1900-2100 m）中国沙棘生长均受到一定程度的抑制，在低海拔主要受干旱胁迫的影响，高海拔对中国沙棘的生长的抑制作用体现在低温引起的水分状况变差、生长季缩短和低温抑制树木的生长。 Abstract:Altitude is an important environmental factor that affects Chinese seabuckthorn (Hippophae rhamnoides L. subsp. sinensis Rousi) distribution and growth. The balance of water metabolism and carbon metabolism is the basis of plant survival and growth. Studies about the effect of altitude on water-carbon metabolism and growth of Chinese seabuckthorn will contribute to fully understanding its adaptability and physiological mechanism to altitude. In this study, wild Chinese seabuckthorn growing in Guandi Mountain area of western Shanxi Province was used as the study object. Twig water potential, branch percentage loss of conductivity (PLC), photosynthesis and nonstructural carbohydrate (NSC) concentration of female seabuckthorn plants at elevation1100 m to 2100 m were measured in June and August, and plant height and crown width were also measured at different elevations. The results showed that with the elevation increasing, the soil water content increased in both June and August, and the midday twig water potential increased first and then decreased. The branch PLC decreased first and then increased in June.With the increase of altitude, the branch vessel diameter did not change significantly, but the vessel density, branch maximum specific water conductivity and leaf area increased first and then decreased. And the net photosynthetic rate increased in June and August. There was no significant change of NSC content in both roots and leaves. With the increase of altitude, both tree height and crown width increased first and then decreased. The above results suggested that the growth of seabuckthorn was inhibited to some extent at both low altitude (1100-1300 m) and high altitude (1900-2100 m). Seabuckthorn at low altitude was mainly affected by drought stress. And the growth inhibition at high altitude was reflected in the poor water status resulting from low temperature, shortened growing season and the inhibition of low temperature on tree growth. 参考文献 相似文献 引证文献