干旱区生态环境知识资源中心(Arid): 氮素及水分添加对科尔沁沙地4种优势植物地上生物量分配的影响

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	氮素及水分添加对科尔沁沙地4种优势植物地上生物量分配的影响
其他题名	Response of Aboveground Biomass Allocation in Four Dominant Species to Water and Nitrogen Addition in the Horqin Sandy Land
	陈静; 李玉霖; 崔夺; 毛伟; 赵学勇
来源期刊	中国沙漠
ISSN	1000-694X
出版年	2014
卷号	34 期号:3 页码:696-703
中文摘要	氮素和水分是半干旱沙地生态系统植物生长主要的影响因素,氮沉降和降水量与降水格局的变化可能会对植物生长产生深刻影响,进而影响沙地生态系统功能。本文通过科尔沁沙地草地连续2年增加水分(夏季增雨,冬季增雪)、添加氮素和同时添加氮素和水分的田间试验,分析了不同处理对4种优势草本植物种(尖头叶藜Chenopodium. acuminatum、白草 Pennisetum centrasiaticum、糙隐子草 Cleistogenes squarrosa 和狗尾草 Setaria viridi)地上生物量积累和分配的影响。结果表明:单纯添加氮素或水分对当地4种优势植物平均地上总生物量、各构件平均生物量及繁殖体和茎平均生物量分配无显著影响。夏季增雨氮素添加使4种植物平均地上总生物量及各构件平均生物量在2010年显著增加,冬季增雪氮素添加使叶生物量分配在2010年显著增加;但是在2012年各处理对生物量的分配影响不显著。这说明夏季增雨*氮素添加能够解除氮素对水分的限制作用,使植物将所获得的有限资源供于叶片生物量的积累和分配。但是添加氮素与水分影响的生物量分配变化程度因物种而异,对尖头叶藜、白草、糙隐子草的影响不明显,对狗尾草的影响显著。
英文摘要	Nitrogen and water are the main constraints in semi-arid sandy land, nitrogen deposition and variations in precipitation probably affect plant growth and thereby affect ecosystem function in sandy land. A field study was conducted to detect the effects of nitrogen and water addition on the aboveground biomass accumulation and allocation of the four dominant herbaceous species (Pennisetum centrasiaticum, Setaria uiridi, Cleistogenes squarrosa and Chenopodium acuminatum) by adding water (precipitation in summer and snow in winter), nitrogen and nitrogen-water interaction for two consecutive years in the Horqin Sandy Land. The results showed that adding nitrogen or water lonely would have no noticeable effects on the average total biomass, the average biomass of its components and its allocation of the propagules and stems in 4 dominant species. Adding nitrogen with water in summer, however, leaded to a significant increase in the average of aboveground total biomass and the average biomass of it components in 2010. Meanwhile, adding nitrogen with snow in winter increased the allocation of leaf biomass remarkably in 2010 and but showed no significant effect on biomass allocation in every treatment in 2012. This implies that adding nitrogen with water could alleviate the interactive constraining between nitrogen and water, subsequently enhance allocation of the limiting resources to leaf. The influences of nitrogen and water addition on aboveground biomass allocation were somewhat related to plant species. The results showed that adding nitrogen and water significantly affected aboveground biomass and its allocation in S. viridis. However, no significant effects were detected in P. centrasiaticum, C. acuminatum and C. squarrosa.
中文关键词	科尔沁沙地 ; 氮沉降 ; 降水量 ; 地上生物量 ; 生物量分配
英文关键词	Horqin Sandy Land nitrogen deposition precipitation aboveground biomass biomass allocation
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:5153904
来源机构	中国科学院西北生态环境资源研究院
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/232179
作者单位	中国科学院寒区旱区环境与工程研究所, 兰州, 甘肃 730000, 中国
推荐引用方式 GB/T 7714	陈静,李玉霖,崔夺,等. 氮素及水分添加对科尔沁沙地4种优势植物地上生物量分配的影响[J]. 中国科学院西北生态环境资源研究院,2014,34(3):696-703.
APA	陈静,李玉霖,崔夺,毛伟,&赵学勇.(2014).氮素及水分添加对科尔沁沙地4种优势植物地上生物量分配的影响.中国沙漠,34(3),696-703.
MLA	陈静,et al."氮素及水分添加对科尔沁沙地4种优势植物地上生物量分配的影响".中国沙漠 34.3(2014):696-703.