干旱区生态环境知识资源中心(Arid): 氮素添加对荒漠化草原草本植物养分化学计量特征的影响

Arid

	氮素添加对荒漠化草原草本植物养分化学计量特征的影响
其他题名	Impact of nitrogen addition on stoichiometric characteristics of herbaceous species in desert steppe
	马英; 许志豪; 曾巧红; 孟建龙; 胡亚虎; 苏洁琼
来源期刊	草业学报
ISSN	1004-5759
出版年	2021
卷号	30 期号:6 页码:1004-5759
中文摘要	为研究氮(N)沉降增加后荒漠草本植物的养分利用策略及碳(C)同化能力和分配格局的变化,以腾格里沙漠东南缘的典型荒漠化草原为研究区,分析了N素添加下不同功能型草本植物根部和地上部化学计量比的变化。结果表明:N素添加会导致土壤中总N、铵态N以及植物体内N含量的显著增加,同时会促进多年生植物尤其是非禾本科植物对磷(P)的吸收,但会显著降低一年生植物根部P的含量。一年生和多年生非禾本科植物的C含量在N素添加下显著降低,多年生禾本科植物的C含量则表现出显著的器官差异,其中地上部的C含量显著降低,而根部显著增加。不同功能型植物体内的C/N和C/P(除一年生植物根部的C/P)在N素添加后显著降低,且二者均表现出根部大于地上部的趋势。植物的N/P在N素添加下显著增加,尤其是一年生植物的变化趋势随施肥水平的变化更加显著。可见,在N素受限的荒漠化草原,外源N素输入导致的土壤N素有效性提升后会凸显P素对植物生长的限制性作用,同时会降低草本植物的C同化能力并加强C向植物根部的分配。
英文摘要	In order to study the nutrient utilization strategies and the changes in carbon(C)assimilation ability and distribution pattern of desert herbaceous plants after increased nitrogen(N)deposition,the changes of root and shoot stoichiometric ratio of different functional plant groups were analyzed under N addition in a typical desert steppe on the southeastern fringe of the Tengger Desert. It was found that the addition of N significantly increased the contents of soil total N,soil ammonium N,and plant N,and promoted the uptake of phosphorus (P) by perennials, especially forbs,but significantly decreased the content of P in roots of annuals. After N addition,the C content of annuals and perennial forbs decreased significantly,while the C content of perennial grasses showed an obvious shootroot difference, in which the C content of shoot decreased significantly, while that of the roots increased significantly. The C∶N and C∶P ratios in plants of the different functional groups(except for the C∶P in roots of annuals)significantly decreased after the addition of N,and in both cases the tendency was for the root decrease to be greater than that of the shoot. In addition,the N∶P ratio in plants significantly increased after the addition of N. In particular,the changes for annuals with improved fertilization level were more significant. Therefore,in the Nlimited desert steppe studied,the improvement of soil N availability resulting from exogenous N input will highlight the restrictive effect of P on plant growth,reduce the C assimilation per unit N of herbaceous plants and enhance the distribution of C to plant roots.
中文关键词	氮沉降 ; 荒漠化草原 ; 植物功能型 ; 生态化学计量比 ; 土壤磷
英文关键词	nitrogen deposition desert steppe plant functional groups ecological stoichiometry soil phosphorus
类型	Article
语种	中文
国家	中国
收录类别	CSCD
WOS类目	Agriculture
CSCD记录号	CSCD:6988383
来源机构	兰州大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/364937
作者单位	马英, 兰州大学资源环境学院, 甘肃省环境污染预警与控制重点实验室, 兰州, 甘肃 730000, 中国.; 许志豪, 兰州大学资源环境学院, 甘肃省环境污染预警与控制重点实验室, 兰州, 甘肃 730000, 中国.; 曾巧红, 兰州大学资源环境学院, 甘肃省环境污染预警与控制重点实验室, 兰州, 甘肃 730000, 中国.; 胡亚虎, 兰州大学资源环境学院, 甘肃省环境污染预警与控制重点实验室, 兰州, 甘肃 730000, 中国.; 孟建龙, 甘肃华鼎环保科技有限公司, 临夏, 甘肃 731199, 中国.; 苏洁琼, 中国科学院西北生态环境资源研究院,沙坡头沙漠研究试验站, 兰州, 甘肃 730000, 中国.
推荐引用方式 GB/T 7714	马英,许志豪,曾巧红,等. 氮素添加对荒漠化草原草本植物养分化学计量特征的影响[J]. 兰州大学,2021,30(6):1004-5759.
APA	马英,许志豪,曾巧红,孟建龙,胡亚虎,&苏洁琼.(2021).氮素添加对荒漠化草原草本植物养分化学计量特征的影响.草业学报,30(6),1004-5759.
MLA	马英,et al."氮素添加对荒漠化草原草本植物养分化学计量特征的影响".草业学报 30.6(2021):1004-5759.