干旱区生态环境知识资源中心(Arid): 短花针茅(Stipa breviflora)功能性状对水热协同作用的敏感性和适应性

Arid

	短花针茅(Stipa breviflora)功能性状对水热协同作用的敏感性和适应性
其他题名	Sensitivity and adaptability of functional traits in Stipa breviflora to changing temperature and precipitation
	吕晓敏; 周广胜; 王玉辉; 许振柱; 陈军; 谭丽萍; 刘涛
来源期刊	科学通报
ISSN	0023-074X
出版年	2014
卷号	59 期号:34 页码:3378-3387
中文摘要	全球变化背景下的温度增加和降水格局变化对植物功能性状影响的研究已有很多, 但关于植物功能性状对水热协同变化的敏感性指标及适应阈值研究较少. 本研究以荒漠草原典型地带性植物短花针茅为研究对象, 通过人工气候箱法模拟研究了其功能性状(生物量特征和形态特征)对温度变化(对照, 增温1.5℃, 2.0℃, 4.0℃, 6.0℃)和降水变化(-30%, -15%, 对照, +15%, +30%) (以1978~2007年6~8月月均温和月均降水为对照)协同作用的敏感性和适应性. 结果表明: (ⅰ)温度和降水变化对短花针茅各功能性状(除地上生物量和叶数)有极显著的交互作用, 生物量特征对水热协同作用的敏感程度大于形态特征, 其中最敏感指标为地下生物量. (ⅱ)不同降水条件下短花针茅对温度的适应性不同, 表现为总生物量与温度的关系不同, 即在降水减少30%时, 呈线性减少关系; 在降水减少15%时, 两者无显著关系; 在当前降水及降水增加时, 呈二次曲线关系. (ⅲ)未来轻度的气候暖干化(降水弱降低而温度小幅增加)可能有利于短花针茅的生长.
英文摘要	Changing precipitation patterns and increased global warming will continue in the foreseeable future. Although the individual effects of warming and precipitation on plants have been studied, the interactive effects of these factors on plant functional traits, especially on indices of sensitivity degree and their adaptive thresholds, have drawn little attention to date. Climate control chambers were used to stimulate the sensitivity and adaptability of functional traits in Stipa breviflora to the interactive effects of warming (control, +1.5, +2.0, +4.0, +6.0°C) and changing precipitation rates (-30%, -15%, control, +15%, +30%) based on the average monthly temperature and precipitation during the growing season (from June to August) from 1978 to 2007. Stipa breviflora is a dominant species of desert steppe in the arid regions of north central China. Warming and changing precipitation had significant interactive effects on functional traits (except aboveground biomass and leaf number) in S. breviflora. Biomass characteristics were more sensitive to these changes than morphological characteristics, and belowground biomass was the most sensitive characteristic. Total biomass adapted in various ways to different regimes of warming and changing precipitation. Specifically, total biomass decreased linearly with increased temperature when precipitation decreased by 30%. However, no significant relationship between biomass and temperature was observed when precipitation decreased by 15%. Nevertheless, biomass had a quadratic curve relationship with temperature when the optimal temperature was 23.2, 24.4, 26.8°C under precipitation levels of no change (control), and increases in precipitation of 15 and 30%, respectively. Additionally, the optimal temperature for total biomass increased with increasing precipitation. The results presented here suggest that the growth of S. breviflora may be positively affected by slightly decreased precipitation and increased temperature in the future.
中文关键词	增温 ; 降水变化 ; 协同作用 ; 敏感性 ; 适应性 ; 短花针茅
英文关键词	warming changing precipitation interaction sensitiveity adaptation Stipa breviflora
语种	中文
国家	中国
收录类别	CSCD
WOS类目	MULTIDISCIPLINARY SCIENCES
WOS研究方向	Science & Technology - Other Topics
CSCD记录号	CSCD:5325513
来源机构	中国科学院植物研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/231402
作者单位	中国科学院植物研究所, 植被与环境变化国家重点实验室, 北京 100093, 中国
推荐引用方式 GB/T 7714	吕晓敏,周广胜,王玉辉,等. 短花针茅(Stipa breviflora)功能性状对水热协同作用的敏感性和适应性[J]. 中国科学院植物研究所,2014,59(34):3378-3387.
APA	吕晓敏.,周广胜.,王玉辉.,许振柱.,陈军.,...&刘涛.(2014).短花针茅(Stipa breviflora)功能性状对水热协同作用的敏感性和适应性.科学通报,59(34),3378-3387.
MLA	吕晓敏,et al."短花针茅(Stipa breviflora)功能性状对水热协同作用的敏感性和适应性".科学通报 59.34(2014):3378-3387.