干旱区生态环境知识资源中心(Arid): 模拟增雨对白刺和油蒿幼苗化学计量特征的影响

Arid

	模拟增雨对白刺和油蒿幼苗化学计量特征的影响
其他题名	Effect of Simulated Precipitation Addition on Stoichiometric Characteristics of Nitraria tangutorum and Artemisia ordosica Seedling
	李新乐; 李永华; 董雪; 段瑞兵; 张冉昊; 张景波
来源期刊	西北植物学报
ISSN	1000-4025
出版年	2020
卷号	40 期号:4 页码:688-696
中文摘要	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。
英文摘要	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.tangutorumseedlings,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.ordosicaseedlings,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.tangutorumseedlings is relatively constant,and the ratio is greater than 16,indicating that the relative growth rate of N.tangutorumseedlings 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.tangutorumseedlings, but is more conducive to the rapid growth of A.ordosicaseedlings.
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
英文关键词	Nitraria tangutorum seedlings Artemisia ordosica seedlings simulated precipitation addition carbon,nitrogen and phosphorus content stoichiometric characteristics
类型	Article
语种	中文
收录类别	CSCD
WOS研究方向	Plant Sciences
CSCD记录号	CSCD:6739473
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/336558
作者单位	李新乐, 中国林业科学研究院沙漠林业实验中心;;中国林业科学研究院荒漠化研究所, 内蒙古磴口荒漠生态系统国家定位观测研究站;;, 磴口;;, 内蒙古;;北京 015200;;100091, 中国.; 段瑞兵, 中国林业科学研究院沙漠林业实验中心;;中国林业科学研究院荒漠化研究所, 内蒙古磴口荒漠生态系统国家定位观测研究站;;, 磴口;;, 内蒙古;;北京 015200;;100091, 中国.; 李永华, 中国林业科学研究院荒漠化研究所, 北京 100091, 中国.; 董雪, 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, 磴口, 内蒙古 015200, 中国.; 张冉昊, 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, 磴口, 内蒙古 015200, 中国.; 张景波, 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, 磴口, 内蒙古 015200, 中国.
推荐引用方式 GB/T 7714	李新乐,李永华,董雪,等. 模拟增雨对白刺和油蒿幼苗化学计量特征的影响[J],2020,40(4):688-696.
APA	李新乐,李永华,董雪,段瑞兵,张冉昊,&张景波.(2020).模拟增雨对白刺和油蒿幼苗化学计量特征的影响.西北植物学报,40(4),688-696.
MLA	李新乐,et al."模拟增雨对白刺和油蒿幼苗化学计量特征的影响".西北植物学报 40.4(2020):688-696.