文献类型：期刊文献

中文题名：模拟增雨对白刺和油蒿幼苗化学计量特征的影响

英文题名：Effect of Simulated Precipitation Addition on Stoichiometric Characteristics of Nitraria tangutorum and Artemisia ordosica Seedling

作者：李新乐[1,2] 李永华[2] 董雪[1] 段瑞兵[1,2] 张冉昊[1] 张景波[1]

第一作者：李新乐

机构：[1]中国林业科学研究院沙漠林业实验中心/内蒙古磴口荒漠生态系统国家定位观测研究站,内蒙古磴口015200;[2]中国林业科学研究院荒漠化研究所,北京100091

年份：2020

卷号：40

期号：4

起止页码：688-696

中文期刊名：西北植物学报

外文期刊名：Acta Botanica Boreali-Occidentalia Sinica

收录：CSTPCD;;北大核心:【北大核心2017】；CSCD:【CSCD2019_2020】；

基金：中国林业科学研究院基本科研业务费专项资助(CAFYBB2020MB007);国家重点研发计划(2017YFC0503804)。

语种：中文

中文关键词：白刺幼苗;油蒿幼苗;模拟增雨;碳氮磷含量;化学计量

外文关键词：Nitraria tangutorum seedlings;Artemisia ordosica seedlings;simulated precipitation addition;carbon;nitrogen and phosphorus content;stoichiometric characteristics

分类号：Q948.12

摘要：降雨是荒漠生态系统过程和功能的最重要限制因子,荒漠植物幼苗对生长季降雨的变化极端敏感。为探讨荒漠植物对未来降雨格局变化的响应,该研究选取乌兰布和沙漠2种典型荒漠植物幼苗(白刺和油蒿)为研究对象,根据生长季内(6~9月)每次降雨量,进行不同梯度的人工模拟增雨试验(CK.自然降雨;A.增雨25%;B.增雨50%;C.增雨75%;D.增雨100%),分析白刺和油蒿幼苗C、N、P含量及化学计量特征对降雨量变化的响应。结果表明:(1)从C、N、P含量在幼苗不同器官分布来看,与CK相比,增雨显著降低了白刺幼苗茎的C含量和根的C、P含量(P<0.05),在一定程度上提高了叶的C、P含量和根的N含量;而增雨处理显著增加了油蒿幼苗茎和叶的C含量(P<0.05),降低了叶、根的N含量和茎、叶、根的P含量。(2)从化学计量比来看,增雨对白刺幼苗茎、叶、根的N∶P影响无显著差异,比值均大于16,且在增雨的环境下白刺幼苗相对生长率较低,主要受P元素限制;油蒿幼苗根N∶P与增雨量呈极显著负相关关系,随增雨量的增加其相对生长率增大。研究认为,模拟增雨对白刺幼苗和油蒿幼苗化学计量特征均有显著影响,但二者幼苗C、N、P元素在各器官的分配格局有所不同,增雨不利于白刺幼苗的生长,而有利于油蒿幼苗的快速生长。
Precipitation is the most important limiting factor for the processes and functions of desert ecosystems,and desert plant seedlings are extremely sensitive to precipitation changes during the growing season.In order to explore the response of desert plant seedlings to future precipitation patterns changes,we selected two typical desert plant seedlings(Nitraria tangutorum and Artemisia ordosica)in UlanBuh desert as research objects.The stoichiometric characteristics of two plant seedlings were studied with artificial simulated precipitation addition experiment,including different gradients(CK.natural precipitation,A.+25%precipitation,B.+50%precipitation,C.+75%precipitation,D.+100%precipitation)according to the precipitation of growing season(June to September).The result showed that:(1)for the distribution of C,N and P contents in different organs of seedlings,increase precipitation significantly reduced the C content of stems and C and P contents of roots of N.tangutorum seedlings,and increased C and P contents of leaves and the N content of roots(P<0.05),while it significantly increased C content in stems and leaves of A.ordosica seedlings,and decreased N content in leaves and roots and the P content in stems,leaves and roots(P<0.05).(2)For the stoichiometric ratio,the N∶P of stems,leaves and roots of N.tangutorum seedlings is relatively constant,and the ratio is greater than 16,indicating that the relative growth rate of N.tangutorum seedlings is lower under the environment of precipitation addition,and is obviously restricted by P element.However,the N∶P of A.ordosica seedlings showed a significant negative correlation with the increase of precipitation.The relative growth rate increased with the increase of precipitation.Therefore,simulated precipitation addition had a significant effect on the stoichiometric characteristics of the desert plant.Increasing precipitation is not conducive to the growth of N.tangutorum seedlings,but is more conducive to the rapid growth of A.ordosica seedlings.