摘要
以川西高原优势灌木中国沙棘为研究对象,开展了不同浓度模拟氮沉降实验,分析了不同径级细根生物量分配、细根碳氮磷含量与细根碳氮磷化学计量特征。结果表明:(1)氮沉降对细根总生物量有显著促进作用,主要表现在较粗级别的根上;(2)氮沉降下细根总氮含量无显著变化,而总磷含量显著下降,使得总C/P和N/P显著升高;(3)碳氮磷化学计量中,中国沙棘细根氮含量相对较低,磷含量相对较高,其细根生长可能受到了氮限制。
In this paper,analysis was made of the biomass allocation,carbon,nitrogen and phosphorus content in fine roots of Hippophae rhamnoides under nitrogen deposition in Western Sichuan Plateau.The results showed that：（1） nitrogen deposition had a significant promotion effect on the total biomass of fine roots,mainly displaying that of the coarser roots; （2） there was no significant change in the total nitrogen content of fine roots under nitrogen deposition,and the total phosphorus content decreased significantly,which made the total C/P and N/P significantly increase; （3） the results of chemical measurement showed that the nitrogen content was relatively lower,whereas the phosphorus content was relatively higher,thus the growth of fine roots might be limited by nitrogen.
作者
李玲
邓东周
樊华
涂卫国
蒋庆云
LI Ling;DENG Dong-zhou;FAN Hua;TU Wei-guo;JIANG Qing-yun(Sichuan Provincial Institute of Natural Resource Sciences,Chengdu 610015,China;Sichuan Academy of Forestry,Chengdu 610081,China;Sichuan Institute of Computer Sciences,Chengdu 610041,China)
出处
《四川林业科技》
2018年第5期1-7,共7页
Journal of Sichuan Forestry Science and Technology
基金
国家科技支撑计划项目(2015BAC05B01)
四川省应用基础研究项目(2017JY0211)
四川省基本业务费项目(2018年)资助
关键词
氮沉降
细根
中国沙棘
川西高原
碳氮磷计量
Nitrogen deposition
Fine roots
Hippophae rhamnoides
Western Sichuan Plateau
