干旱区生态环境知识资源中心(Arid): 降水格局变化对红砂幼苗生长的影响

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	降水格局变化对红砂幼苗生长的影响
其他题名	Effects of changing precipitation patterns on seedling growth of Reaumuriasoongorica
	段桂芳; 单立山; 李毅; 张正中; 张荣
来源期刊	生态学报
ISSN	1000-0933
出版年	2016
卷号	36 期号:20 页码:6457-6464
中文摘要	以西北荒漠生态系统典型植物红砂(Reaumuria soongorica)一年生幼苗为研究对象,利用人工遮雨装置,设置3个降水量梯度(W-、W、W+)和2个降水间隔时间梯度(T、T+)进行模拟试验,研究了不同降水格局下红砂幼苗生长、生物量积累和分配的变化特征。结果表明:(1)降水量增加30%,幼苗株高和基径分别平均增加22.0%和28.0%,延长降水间隔时间其作用更显著,分别平均增加24.57%和32.98%(P<0.05);(2)在延长降水间隔时间的同时增加降水量,幼苗地上、地下和总生物量分别显著增加了241.57%、223.95%和236.72%(P<0.05),幼苗地上部分的生长优于地下部分;(3)与对照相比,降水量减少30%,幼苗根长平均增加21.0%,根冠比平均显著增加53.73%(P <0.05),而各部分生物量差异不显著。
英文摘要	Global climate change is predicted to alter rainfall patterns of the growing season,potentially reducing total quantities of growing season precipitation and redistributing rainfall into fewer but larger individual events. Such changes are likely to have profound effects on terrestrial ecosystems. Many soil,plant,and ecosystem properties in the arid and semiarid regions of Northwest China could be affected,and this could ultimately affect species composition and biological diversity. Both the quantity of rainfall and the precipitation time interval influence seedling growth. Although many studies have examined the effects of a single environmental factor (e.g.,temperature,precipitation,or carbon dioxide [ CO_2]),or even two factors (e.g.,precipitation and temperature or precipitation and CO_2),the interaction of changing precipitation and precipitation time intervals on plants,especially from multiple precipitation and precipitation interval regimes,have attracted little attention to date. Given the strong influence of rainfall on plant growth,it is important to understand the implications of these interactions. Reaumuria soongorica is a typical species of the arid regions of Northwest China. The responses of R. soongorica seedlings to altered precipitation patterns could reflect the general responses of this ecological system. Annual R. soongorica seedlings were used as a case study species to study growth traits,biomass accumulation,and biomass allocation under different precipitation patterns during the growing season. A ventilated rainout shelter was used for experimental manipulation of rainfall patterns to keep temperature and CO_2 close to natural conditions. Then we set up a controlled experiment with two variables: precipitation quantity and precipitation time interval. The three variations of precipitation quantity were - 30% (W -); natural precipitation (W); and + 30% (W +). The two precipitation time intervals were 5 days and 10 days. The results showed that: (1) with increased precipitation (+30%),the height and base diameter of seedlings increased by an average of 22.0% and 28.0%,respectively (P < 0.05). However,these effects were even more significant when the precipitation interval was extended from 5 to 10 days; these conditions increased height and base diameter by an average of 24.57% and 32.98%,respectively (P < 0.05). (2) Above ground,below ground,and total biomass were significantly increased by 241.57%,223.95%,and 236.72% (P < 0.05) when precipitation was increased by 30% and the precipitation interval was extended to 10 days,and the growth of above ground parts was marginally better than that of underground parts,but not obvious. (3) Compared to the control,the mean increase in root length was 21.0%,and the root/shoot ratio increased significantly by 53.73% (P < 0.05). When precipitation was decreased by 30%,however,there were no significant changes in biomass accumulation and growth. Through this study we noted that both the quantity and time interval of precipitation significantly affected growth and biomass accumulation in R. soongorica seedlings; however,the effects of precipitation quantity were greater than those of the precipitation time interval. Nevertheless,the effects of precipitation still depended greatly on the time interval,with the strongest effects being observed following increases in precipitation with a concurrent extension of the precipitation time interval to 10 days. These results suggest that large events of increased rainfall and extended rainfall intervals in the future will be more conducive to biomass accumulation and growth inR. soongorica seedlings.
中文关键词	降水格局 ; 红砂幼苗 ; 生物量 ; 生长
英文关键词	precipitation patterns Reaumuria soongorica seedlings biomass growth
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:5847062
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/2XILL650/234820
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	段桂芳,单立山,李毅,等. 降水格局变化对红砂幼苗生长的影响[J]. 甘肃农业大学,2016,36(20):6457-6464.
APA	段桂芳,单立山,李毅,张正中,&张荣.(2016).降水格局变化对红砂幼苗生长的影响.生态学报,36(20),6457-6464.
MLA	段桂芳,et al."降水格局变化对红砂幼苗生长的影响".生态学报 36.20(2016):6457-6464.