干旱区生态环境知识资源中心(Arid): 四种荒漠草原植物的生长对不同氮添加水平的响应

Arid

	四种荒漠草原植物的生长对不同氮添加水平的响应
其他题名	Responses of growth of four desert species to different N addition levels
	黄菊莹 1; 余海龙 2
来源期刊	植物生态学报
ISSN	1005-264X
出版年	2016
卷号	40 期号:2 页码:165-176
中文摘要	大气氮(N)沉降增加加速了生态系统N循环, 从而会对生态系统的结构和功能产生巨大的影响, 尤其是一些受N限制的生态系统。研究N添加对荒漠草原植物生长的影响, 可为深入理解N沉降增加对我国北方草原群落结构的影响提供基础数据。该文基于2011年在宁夏荒漠草原设置的N沉降增加的野外模拟试验, 研究了两年N添加下4个常见物种(牛枝子(Lespedeza potaninii)、老瓜头(Cynanchum komarovii)、针茅(Stipa capillata)和冰草(Agropyron cristatum))不同时期种群生物量和6-8月份相对生长速率的变化特征。并通过分析物种生长与植物(群落和叶片水平)和土壤碳(C)、N、磷(P)生态化学计量学特征的关系, 探讨C:N:P化学计量比对植物生长养分限制的指示作用。结果显示N添加促进了4个物种的生长, 但具有明显的种间差异性, 且这种差异也存在于相同生活型的不同物种间。总体而言, 4个物种种群生物量与叶片N浓度、叶片N:P、群落N库、土壤全N含量和土壤N:P存在明显的线性关系, 与植物和土壤C:N和C:P的相关关系相对较弱。几个物种相对生长速率与植物和土壤N:P也呈现一定程度的正相关关系, 但与其他指标相关性较弱。以上结果表明, 短期N沉降增加提高了植物的相对生长速率, 促进了植物生长, 且更有利于针茅和老瓜头的生物量积累, 从而可能会逐渐改变荒漠草原群落结构。植物N:P和土壤N:P对荒漠草原物种生长具有较强的指示作用: 随着土壤N受限性逐渐缓解, 土壤N含量和N:P相继升高, 可供植物摄取的N增多, 因而有利于植物生长和群落N库积累。
英文摘要	Aims The increase in atmospheric N deposition has accelerated N cycling of ecosystems, thus altering the structure and function of ecosystems, especially in those limited by N availability. Studies on the response of plant growth to artificial N addition could provide basic data for a better understanding of how the structure of grasslands in northern China responds to increasing N deposition. Methods We investigated the seasonal dynamics of plant growth of four species after 2-year multi-level N addition in a field experiment conducted in a desert steppe of Ningxia in 2011. Plant biomass and the relative growth rate (RGR) of the studied species were measured and their relationships with C:N:P ratios of plants (community and leaf levels) and soils were analyzed. Important findings Results in 2012 showed that 2-year N addition promoted the growth of the four species and the effects were different among growth forms and were species-specific. In general, the plant biomass of the studied species was significantly correlated with leaf N concentration, leaf N:P ratio, community N pool, soil total N content and soil N:P ratio, while only weak relationships were observed between plant biomass and C:N and C:P ratios of plants and soils. In contrast, there was a significant linear relationship between RGR and N:P ratios both of plants and soils. Our results suggest that short-term N addition promoted the accumulation of plant biomass, and the species-specific responses to stimulated N addition can directly affect the structure of the desert steppe ecosystem. Plant N:P ratio and soil N:P ratio could indicate nutrient limitation of plant growth to a certain extent: N addition increased soil N content and N:P ratio, and thus relieved N limitation gradually. Once more N is available to plants, the growth of plants and the accumulation of community N was stimulated in turn.
中文关键词	C、N、P生态化学计量学特征 ; 荒漠草原 ; 相对生长速率 ; 大气N沉降增加 ; 种群生物量
英文关键词	C:N:P ecological stoichiometry desert steppe relative growth rate increase in atmospheric N deposition population biomass
语种	中文
国家	中国
收录类别	CSCD
WOS类目	PLANT SCIENCES
WOS研究方向	Plant Sciences
CSCD记录号	CSCD:5650090
来源机构	宁夏大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/235300
作者单位	1.宁夏大学新技术应用研究开发中心, 银川, 宁夏 750021, 中国; 2.宁夏大学资源环境学院, 银川, 宁夏 750021, 中国
推荐引用方式 GB/T 7714	黄菊莹,余海龙. 四种荒漠草原植物的生长对不同氮添加水平的响应[J]. 宁夏大学,2016,40(2):165-176.
APA	黄菊莹,&余海龙.(2016).四种荒漠草原植物的生长对不同氮添加水平的响应.植物生态学报,40(2),165-176.
MLA	黄菊莹,et al."四种荒漠草原植物的生长对不同氮添加水平的响应".植物生态学报 40.2(2016):165-176.