干旱区生态环境知识资源中心(Arid): 氮磷供给对荒漠草原土壤和白草C:N:P化学计量特征的影响

Arid

	氮磷供给对荒漠草原土壤和白草C:N:P化学计量特征的影响
其他题名	Effects of N and P Supply on the C:N:P Stoichiometry in Both Soil and a Desert Steppe Species Pennisetum centrasiaticum
	康扬眉 1; 马凯博 1; 黄菊莹 2; 杜雅仙 1; 余海龙 1
来源期刊	西北植物学报
ISSN	1000-4025
出版年	2018
卷号	38 期号:8 页码:1507-1516
中文摘要	大气氮(N)沉降增加是全球变化的一个重要方面。长期N沉降增加会提高生态系统N:磷(P)比,导致系统P限制增加以及植物P需求增强。该试验通过对白草(Pennisetum centrasiaticum)设立的N:P供给(在统一施用N10.0g·m~(-2)·a~(-1)的基础上,通过改变P施用量,形成6个N:P处理水平)盆栽控制试验,研究了连续2年(2013~2014年)N:P供给处理对土壤和白草碳(C):N:P化学计量特征的影响,并分析了C:N:P化学计量特征对白草生长和养分利用的指示意义。结果显示:(1)降低N:P供给(提高P施用量)能够显著降低土壤和白草的C:P和N:P,缓解白草生长的P受限性,从而促进白草的生物量积累。(2)随着N:P供给进一步降低,土壤N受限性增加。(3)白草通过提高其枯叶N回收能力,减少对土壤N库的依赖,反映了白草对N受限环境的弹性适应。研究表明,人为适当的添加P能够通过调节土壤和植物C、N、P计量平衡关系,减轻土壤和植物间P的供需压力,从而缓解N添加引起的荒漠草原P受限性增强。该研究结果可为N沉降增加背景下脆弱生态系统的适应性管理提供科学指导。
英文摘要	The increase in atmospheric nitrogen(N)deposition is an important aspect of global change.Numerous studies have shown that long-term N deposition would increase N:phosphorus(P)of ecosystems,leading to the increase of P limitation in ecosystems and hence accelerating the P demand of plants.In this paper,we conducted a 2-year(2013-2014)N:P supply(10g·m~(-2)·a~(-1) N combined with different P amounts)pot-cultured experiment for a common desert steppe species Pennisetum centrasiaticum.We determined the effects of N:P supply on C:N:P stoichiometry in both soil and P.centrasiaticum(leaves and belowground parts).We also analyzed the indication of C:N:P stoichiometry for the growth and nutrient utilization of P.centrasiaticum.The results showed that:(1)reducing N:P supply(thereby increasing P fertilization)significantly decreased C:P and N:P in both soils and P.centrasiaticum,alleviating P limitation for the growth of P.centrasiaticum,and further promoting the biomass accumulation of P.centrasiaticum.(2)The gradual decrease of N:P supply would shift P limitation to N limitation for P.centrasiaticum.(3)In this case,P.centrasiaticumincreased the ability of N resorption from its senescing leaves,which reduced its dependence on soil N pool,reflecting the adaptation of P.centrasiaticum to N-limited environments.Our results suggest that appropriate artificial P addition could adjust the stoichiometry balance of C,N,and P between soil and plants,alleviate the pressure between soil P supply and plant P demand,and thus mitigating N-induced increase of P limitation.The results could provide scientific guidance for the adaptive management of fragile ecosystems under increasing N deposition.
中文关键词	脆弱生态系统 ; N沉降 ; 化学计量特征 ; 养分回收 ; 养分摄取 ; P限制
英文关键词	fragile ecosystems N deposition ecological stoichiometry nutrient resorption nutrient uptake P limitation
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:6328527
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/2XILL650/238492
作者单位	1.宁夏大学资源环境学院, 银川, 宁夏 750021, 中国; 2.宁夏大学环境工程研究院, 银川, 宁夏 750021, 中国
推荐引用方式 GB/T 7714	康扬眉,马凯博,黄菊莹,等. 氮磷供给对荒漠草原土壤和白草C:N:P化学计量特征的影响[J]. 宁夏大学,2018,38(8):1507-1516.
APA	康扬眉,马凯博,黄菊莹,杜雅仙,&余海龙.(2018).氮磷供给对荒漠草原土壤和白草C:N:P化学计量特征的影响.西北植物学报,38(8),1507-1516.
MLA	康扬眉,et al."氮磷供给对荒漠草原土壤和白草C:N:P化学计量特征的影响".西北植物学报 38.8(2018):1507-1516.