秦岭东段不同海拔栓皮栎粗根非结构性碳水化合物含量的季节动态  

Seasonal variations of non-structural carbohydrate contents in coarse roots of Quercus variabilis Blume at different altitudes in the eastern Qinling Mountain

作　　者：章异平[1] 师志强 竹磊 焦会景 王淳秋 武靖 徐军亮[1] ZHANG Yi-ping;SHI Zhi-qiang;ZHU Lei;JIAO Hui-jing;WANG Chun-qiu;WU Jing;XU Jun-liang(College of Horticulture and Plant Protection,Henan University of Science and Technology,Luoyang 471000,Henan,China;Luoyang Second Experimental Middle School,Luoyang 471000,Henan,China;Beijing Changping Vocational School,Beijing 100206,China;Huairou District Landscaping Bureau of Beijing Municipality,Beijing 101400,China)

机构地区：[1]河南科技大学园艺与植物保护学院,河南洛阳471000 [2]洛阳市第二实验中学,河南洛阳471000 [3]北京昌平职业学校,北京100206 [4]北京市怀柔区园林绿化局,北京101400

出　　处：《生态学杂志》2021年第3期712-720,共9页Chinese Journal of Ecology

基　　金：国家自然科学基金项目(41801026,41401063);国家留学基金项目(201808410575)资助。

摘　　要：掌握树木根部碳存储规律对于准确估算碳在地上器官与地下器官间的分配非常必要。本研究以栓皮栎(Quercus variabilis Blume)为对象,在2016年5月—2017年6月,通过周期性采样方法(共计采样14次),测定了高、低海拔(970和650 m)栓皮栎粗根非结构性碳水化合物(non-structural carbohydrates,NSC)及其组分(可溶性糖和淀粉)含量的年内动态变化。结果表明:除高海拔淀粉外,栓皮栎粗根NSC及其组分含量均随季节变化差异显著(P<0.05)。粗根NSC含量呈现生长季初期(3月)下降,非生长季(2月)达到最高值的变化趋势;栓皮栎粗根NSC组成以淀粉为主,高、低海拔淀粉含量占比分别为61%和71%,这可能与栓皮栎适应区域环境特征有关。不同海拔间,栓皮栎粗根NSC及其组分含量的差异出现在生长季初期(3月,P<0.05)。高海拔(10.26%)栓皮栎粗根NSC含量小于低海拔(13.96%)。栓皮栎粗根NSC含量存在明显的季节波动,粗根在生长季末及非生长季积累的NSC对下一年树木生长启动非常重要,研究结果有助于理解树木地下器官对树木生长的碳供应机制。Understanding the carbohydrate reserves in root is necessary for the accurate estimation of carbon allocation between aboveground and belowground organs.Here,we investigated the seasonal variations of non-structural carbohydrates(NSC)and its components(soluble sugar and starch)in coarse roots of Chinese cork oak(Quercus variabilis Blume)at two altitudes(650 and970 m)in eastern Qinling Mountain.Root samples were collected for 14 times at a biweekly/monthly interval from May 2016 to June 2017.The results showed that the concentrations of NSC and its components in Q.variabilis coarse roots had a significant seasonal variation at both altitudes(P<0.05),except for the starch at high altitude.The maximum concentrations of NSC in coarse roots appeared at the non-growing season(February),and declined at the beginning of the growing season(March).Starch was the major contributor to total NSC in oak coarse roots,accounting for 61% and 71% of the total NSC at high and low altitudes,respectively.As the reservoirs for future use,higher content of starch in coarse roots would support carbon resource and guarantee tree growth in the next year.There was a significant difference in the NSC concentrations of Q.variabilis coarse roots between high and low altitudes(March,P<0.05).Overall,the NSC concentration of Q.variabilis was lower at high altitude(10.26%)than that of the low altitude(13.96%).Seasonal fluctuations of NSC in coarse roots of Q.variabilis were consistent with the tree’s phenological rhythms.The storage of NSC in coarse roots at the end of the growing season and the non-growing season is important for the onset of tree growth in the following year.Our results help understand the mechanism of carbon supply from underground organs to tree growth.

关 键 词：栓皮栎 可溶性糖 淀粉 可溶性糖与淀粉的比值 年内动态变化 

分 类 号：S792.18[农业科学—林木遗传育种]