干旱区生态环境知识资源中心(Arid): 红砂对大气CO_2浓度升高及降水变化的生长响应

Arid

	红砂对大气CO_2浓度升高及降水变化的生长响应
其他题名	Growth Responses of Reaumuria soongorica to Elevated CO_2 Concentration and Precipitation Changing
	种培芳; 刘晟彤; 李毅; 苏世平; 单立山
来源期刊	草地学报
ISSN	1007-0435
出版年	2017
卷号	25 期号:5 页码:1061-1068
中文摘要	以荒漠植物红砂(Reamuria soongorica)为试材,采用开顶式CO_2控制气室模拟CO_2浓度变化(350,5 50和700 mumol·mol~(-1)),研究了降水变化(- 30%,- 15%,0,+ 15%,+ 30%)及其与CO_2的协同作用对红砂生长特性的影响。结果表明:在6、7、8月份,CO_2浓度增加对5种降水下红砂的株高、地上生物量、根生物量和总生物量均有增肥效应,且降水增加时的增肥效应大于降水减少时的。6、7月份,红砂的根质量分数和根冠比在5种降水下均随CO_2浓度的升高而降低;而在8月份仅降水为- 15%时,CO_2浓度增加可促进红砂的根质量分数和根冠比。综上所述,未来降水增多时,CO_2浓度升高可促进红砂地上生物量积累来获取更多资源;降水减少,CO_2浓度增加可促进地下生物量的分配来适应干旱环境,但这种调节作用与降水的多少及处理时间长短有关。
英文摘要	Pot experiments were conducted to study the co-effects of elevated CO_2 concentration and changing precipitation on growth characters of Reaumuria soongorica,a dominant of desert steppe in the arid region of China,in order to assess the possible effect of global climate change on desert ecosystem. The main plot contained three CO_2 concentrations (350,5 00 and 700 mumol·mol~(-1)) and five precipitation levels[natural precipitation as control (0), precipitation minus 30% (- 30%),precipitation minus 15% (- 15%),precipitation plus 15% (+ 15%),precipitation plus 30% (+ 30%) ]. The results showed that in June,July and August,elevated CO_2 promoted the increase of plant height,aboveground biomass,root biomass and total biomass of R. soongorica under five precipitation conditions,and CO_2 fattening effect on the growth in increased precipitation was bigger than that of in decreased precipitation. In June and July,root mass fraction and root / shoot ratio were decreased with elevated CO_2 concentration under five precipitation conditions,and only in August,root mass fraction and root / shoot ratio of R. soongorica were enhanced by elevated CO_2 under - 15% precipitation. In conclusion,elevated CO_2 concentration would promote R. soongorica to accumulate more aboveground biomass to abtain more resources when precipitation is increased in the future; elevated CO_2 concentration would stimulate this plant distribute more belowground biomass to adapt drought environment when precipitation is decreased in the future,but the effect was limited by the amount of precipitation and processing time.
中文关键词	CO_2浓度升高 ; 降水 ; 生物量分配 ; 生长策略 ; 红砂
英文关键词	Elevated CO_2 concentration Precipitation Biomass accumulation and allocation Growth strategy Reaumuria soongorica
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:6166728
来源机构	甘肃农业大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/235646
作者单位	甘肃农业大学林学院, 兰州, 甘肃 730070, 中国
推荐引用方式 GB/T 7714	种培芳,刘晟彤,李毅,等. 红砂对大气CO_2浓度升高及降水变化的生长响应[J]. 甘肃农业大学,2017,25(5):1061-1068.
APA	种培芳,刘晟彤,李毅,苏世平,&单立山.(2017).红砂对大气CO_2浓度升高及降水变化的生长响应.草地学报,25(5),1061-1068.
MLA	种培芳,et al."红砂对大气CO_2浓度升高及降水变化的生长响应".草地学报 25.5(2017):1061-1068.