干旱区生态环境知识资源中心(Arid): 增温和氮素添加降低荒漠草原多年生植物氮素回收效率

Arid

	增温和氮素添加降低荒漠草原多年生植物氮素回收效率
其他题名	Nitrogen resorption efficiency of perennial plant decreases with warming and nitrogen addition in desert steppe
	李元恒 1; 韩国栋1 ; 王珍 1; 王正文 2; 赵萌莉 1; 王萨仁娜 3
来源期刊	生态学报
ISSN	1000-0933
出版年	2015
卷号	35 期号:18 页码:5948-5956
中文摘要	植物营养器官在枯萎过程中将部分氮素转移到储藏组织之中,是植物适应生境的重要策略。以位于内蒙古荒漠草原的增温和添加氮素的交互试验为平台,对建群种短花针茅(Stipabreviflora)以及优势种无芒隐子草(Cleistogenessongorica)、银灰旋花(Convolvulusammannii)、冷蒿(Artemisiafrigida)和木地肤(Kochiaprostrata)等5种多年生植物绿叶期和枯叶期氮浓度,以及氮素回收效率进行了研究。结果表明:增温处理下,植物绿叶期和枯叶期的平均氮素浓度提高了5.5%和11.3%,氮素回收效率显著降低了7.0%。氮素添加使绿叶期植物氮浓度显著提高了5.2%,使植物氮素回收效率降低2.9%。增温和氮素添加对植物枯叶期、绿叶期氮浓度和氮素回收效率有显著的交互作用。氮浓度和氮素回收效率对增温和氮素添加的响应在5个物种间都有显著差异,即这种响应具有物种特异性。研究表明独立的增温和氮素添加以及两者的交互作用都降低该荒漠草原生态系统中植物氮素回收效率,这些结果将为气候变化条件下荒漠生态系统氮素回收效率变化趋势的预测提供数据支持和实验证据。
英文摘要	When vegetative organs of plants wither, the nutrient resorption from senescing tissues to storage tissues was the most important adaptative strategy in different growing environments. The nitrogen concentration in green, senescent stages and nitrogen resorption efficiency (NRE) in 5 perennial dominant species were evaluated in a manipulative experiment conducted in Stipa breviflora desert steppe, Inner Mongolia, with treatments of warming, nitrogen addition and its interaction. The results showed that warming significantly increased nitrogen concentration in green and senescent plants by 5.5% and 11.3%, respectively, and decreased NRE by 7.0%. Nitrogen addition significantly increased nitrogen contents in green plants by 5.2% and decreased NRE by 2.9%. There was significant interaction between warming and nitrogen addition to increase nitrogen concentrations of green and senescent plants and to reduce NRE. The nitrogen concentration and NRE of the five species showed higher species-specific responses in different treatments, these species-specific responses reflected flexible adaptation of the plants to environment change. This research indicated that independently warming and nitrogen and its interaction decreased plant NRE in desert steppe ecosystem. These results will provide data support and experimental evidence in predicting the trend of NRE of desert ecosystem under climate change.
中文关键词	氮回收度 ; 氮素回收效率 ; 气候变暖 ; 氮素添加 ; 荒漠草原
英文关键词	nitrogen resorption proficiency nitrogen resorption efficiency global warming nitrogen addition desert steppe
语种	中文
国家	中国
收录类别	CSCD
WOS类目	BIOLOGY
WOS研究方向	Life Sciences & Biomedicine - Other Topics
CSCD记录号	CSCD:5522087
来源机构	内蒙古农业大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/233197
作者单位	1.内蒙古农业大学生态环境学院, 呼和浩特, 内蒙古 010019, 中国; 2.中国科学院沈阳应用生态研究所, 森林与土壤生态国家重点实验室, 沈阳, 辽宁 110164, 中国; 3.内蒙古农业大学生态环境学院, 内蒙古遥感与地理信息系统重点实验室, 呼和浩特, 内蒙古 010019, 中国
推荐引用方式 GB/T 7714	李元恒,韩国栋,王珍,等. 增温和氮素添加降低荒漠草原多年生植物氮素回收效率[J]. 内蒙古农业大学,2015,35(18):5948-5956.
APA	李元恒,韩国栋,王珍,王正文,赵萌莉,&王萨仁娜.(2015).增温和氮素添加降低荒漠草原多年生植物氮素回收效率.生态学报,35(18),5948-5956.
MLA	李元恒,et al."增温和氮素添加降低荒漠草原多年生植物氮素回收效率".生态学报 35.18(2015):5948-5956.