干旱区生态环境知识资源中心(Arid): 水、氮控制对短花针茅草原气体交换的影响

Arid

	水、氮控制对短花针茅草原气体交换的影响
其他题名	The Response of gas exchange on water supplied and N addition in the Stipa breviflora steppe
	李寅龙 1; 红梅 1; 白文明 2; 韩国栋1 ; 王海明 3
来源期刊	生态环境学报
ISSN	1674-5906
出版年	2014
卷号	23 期号:2 页码:217-222
中文摘要	随着对气候变化日趋关注,人们对生态系统气体交换及其主要影响因素进行了大量研究。短花针茅草原作为荒漠草原的典型代表,是亚洲特有的一种草原类型,是最干旱的草原类型,生态环境异常严酷,系统极度脆弱,稳定性差,在自然和人为干扰下极易退化。以短花针茅(Stipabreviflora)草原为研究对象,通过控制降雨量以及氮素添加对生态系统气体交换进行监测,研究气体交换对降雨量和氮素添加的响应过程,揭示降雨量和氮素添加对生态系统气体交换的影响作用。该文在2012年自然条件下,采用自动CO_2通量系统(Li-6400,Li-COR,Lincoln,NE,USA)野外测定短花针茅(Stipabreviflora)草原生态系统气体交换数据,比较研究了增雨施肥(WN)、增雨不施肥(W)、减雨施肥(RN)、减雨不施肥(R)、单独施肥(N)、自然状况(CK)条件下2012年气体交换变化规律。结果表明:整个生长季生态系统净CO_2交换(NEE)、总的生态系统生产力(GEP)、生态系统呼吸值(ER)都呈先升高后降低的趋势,并在生长旺盛期(8月)达到最大值。NEE在N、W处理下有升高,其他处理都降低。ER在N、WN处理下都有升高,其他处理都降低。GEP在W、N、WN处理下都有升高,其他处理都降低。NEE、ER、GEP都是在N处理中达到最大值。
英文摘要	As the main Chinese grassland region and part of the world’s largest contiguous arid and semi-arid steppe ecosystem, the desert steppe of Inner Mongolian plays an increasingly important role in environmental conservation and global climate change. However, this ecosystem has been severely degraded in recent decades due to poor management and increasing human pressures. As a typical desert steppe, stipa breviflora steppe is mainly located in the drought area in Inner Mongolia. Since nitrogen is an important limiting factor in desert steppe of Inner Mongolian, the application of nitrogen may be a useful approach to restore degraded grasslands and increase carbon sequestration. However, the uptake of applied nitrogen mainly depends on water availability. In arid and semiarid ecosystems, rainfall is often the first limiting factor for plant growth and productivity, in which case nitrogen fertilization may only be effective at increasing rangeland production in wet years. The ecosystem gas exchange is a very important indicator in evaluating carbon cycle of terrestrial ecosystems. However, limited studies can be found to address how the water and nitrogen affect the the ecosystem gas exchange in desert steppe. In the present study, the main objectives were to investigate the response of the ecosystem gas exchange to rainfall and nitrogen fertilizer application and to study the interactive effects of water and nitrogen on the ecosystem gas exchange in the stipa breviflora steppe. A comparative study of different water and nitrogen treatments was conducted in the Desert Steppe of Siziwang County in Inner Mongolia, P. R. China in 2012. The randomized complete block design was used with three replications and two nitrogen levels and three water treatments. The nitrogen rates were 0 and 100 kg N ha~(-1). The three water treatments consisted of control (local annual average rainfall of 58 mm), 70% of control and 130% of control. Under the nature condition, the ecosystem gas exchange was measured by using LI-6400(Li-6400, Li-COR, Lincoln, NE, USA)in the stipa breviflora steppe. Experimental factors are water supplied and N addition under natural conditions. The results were showed that the whole growing season net ecosystem CO_2 exchange (NEE), the total ecosystem productivity (GEP), the value of ecosystem respiration (ER) were tested increased at first and then decreased, and in the growing season (August) reached at maximum. Under N, W treatments NEE has been increased, but the other treatments NEE has been reduced. Under N, WN treatments ER has been increased, but the other treatments ER has been reduced. Under N, W, WN treatments GEP has been increased, but the other treatments GEP has been reduced. NEE, ER, GEP reached at maximum at the N treatment. The changing global climate and the predicted increasing frequency of extreme weather in Inner Mongolia in the coming years may result in changes in resource availabilities. Therefore, our research results have important implications for better managing grassland in Inner Mongolia.
中文关键词	控制性降雨 ; 氮素添加 ; 短花针茅草原 ; 气体交换
英文关键词	Rainfall control Nitrogen addition Stipa breviflora steppe Gas exchange
语种	中文
国家	中国
收录类别	CSCD
WOS类目	ENVIRONMENTAL SCIENCES
WOS研究方向	Environmental Sciences & Ecology
CSCD记录号	CSCD:5131862
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/2XILL650/231543
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 010018, 中国; 2.中国科学院植物研究所, 北京 100093, 中国; 3.内蒙古农牧科学院, 呼和浩特, 内蒙古 010031, 中国
推荐引用方式 GB/T 7714	李寅龙,红梅,白文明,等. 水、氮控制对短花针茅草原气体交换的影响[J]. 内蒙古农业大学,2014,23(2):217-222.
APA	李寅龙,红梅,白文明,韩国栋,&王海明.(2014).水、氮控制对短花针茅草原气体交换的影响.生态环境学报,23(2),217-222.
MLA	李寅龙,et al."水、氮控制对短花针茅草原气体交换的影响".生态环境学报 23.2(2014):217-222.