大兴安岭南段蒙古栎粗根非结构性碳对不同坡向的响应  

Effect of different slope characteristics on root nonstructural carbon of Quercus mongolica in the southern Daxing’anling Mountains

作　　者：刘艺伟 魏江生 黄利东 赵鹏武 舒洋[3,4] 李慧敏 曹立春 张婷 LIU Yiwei;WEI Jiangsheng;HUANG Lidong;ZHAO Pengwu;SHU Yang;LI Huimin;CAO Lichun;ZHANG Ting(College of Grassland,Resources and Environment,Inner Mongolia Agricultural University,Hohhot 010011,Inner Mongolia,China;Inner Mongolia Key Laboratory of Soil Quality and Nutrient Resource,Hohhot 010011,Inner Mongolia,China;Saihanwla Forest Ecosystem National Station,Chifeng 024000,Inner Mongolia,China;Forestry College of Inner Mongolia Agricultural University,Hohhot 010011,Inner Mongolia,China)

机构地区：[1]内蒙古农业大学草原与资源环境学院,内蒙古呼和浩特010011 [2]内蒙古自治区土壤质量与养分资源重点实验室,内蒙古呼和浩特010011 [3]内蒙古赛罕乌拉森林生态系统国家定位观测研究站,内蒙古赤峰024000 [4]内蒙古农业大学林学院,内蒙古呼和浩特010011

出　　处：《干旱区研究》2024年第9期1572-1582,共11页Arid Zone Research

基　　金：国家重点研发计划项目(2022YFF0801801);内蒙古自治区自然科学基金项目(2021MS03045)。

摘　　要：在半干旱区,掌握树木根部碳储存规律对探究水分胁迫影响地上、地下器官碳分配机制至关重要。本研究以蒙古栎(Quercus mongolica)为研究对象,在2021年(湿润年)、2022年(干旱年)、2023年(正常年)的生长季每月采集不同坡向(阳坡、半阳坡、阴坡)蒙古栎粗根样本,测定非结构性碳(Non-Structural Carbohydrate,NSC)及其组分(可溶性糖、淀粉)含量并分析其动态变化规律。结果表明:(1)粗根NSC组成以淀粉为主,粗根NSC及其组分含量随5月、6月、7月、8月、9月的顺序递增且差异显著(P<0.05)。(2)NSC含量及淀粉含量随湿润年、正常年、干旱年的顺序递增;不同坡向淀粉含量随阳坡、半阳坡、阴坡的顺序递减,且二者均差异显著(P<0.05)。(3)通过对粗根NSC及其组分影响的主导因素分析,坡向因素影响大,反应了粗根NSC对潜在蒸散量梯度反应敏感。研究结果有助于理解干旱环境下地下器官对树木生长碳分配的调节机制。The distribution of carbon within plant aboveground and subsurface organs is important for understanding the carbon storage systems in tree roots in semi-arid areas.In this study,coarse root samples of Quercus mongolica.were collected monthly during the growing seasons of 2021(wet year),2022(dry year),and 2023(normal year).The changes in nonstructural carbon and its components(soluble sugar and starch)were analyzed;the NSC(Non-Structural Carbohydrate)content of coarse root was primarily starch,and it increased significantly with seasonal changes(P<0.05).The NSC and starch contents were highest during the wet season,followed by the normal and dry seasons.The starch content was highest on the sunny slope,followed by the semi-sunny and shady slopes regions(P<0.05).Slope characteristics affect the NSC and component contents of coarse roots,as NSC and component contents change in response to potential evapotranspiration gradients.The findings provide a better understanding of the mechanisms controlling carbon distribution within plant underground organs in response to arid conditions.

关 键 词：大兴安岭南段 非结构性碳水化合物 蒙古栎 根系 坡向 

分 类 号：S792.186[农业科学—林木遗传育种]