Response of plant functional traits of Leymus chinensis to extreme drought in Inner Mongolia grasslands
Response of plant functional traits of Leymus chinensis to extreme drought in Inner Mongolia grasslands
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内蒙古草原羊草植物功能性状对极端干旱的响应
DOI：
10.1007/s11258-018-0887-2
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发表时间：
2018-10
期刊：
影响因子：
1.7
通讯作者：
Smith Melinda D.
中科院分区：
文献类型：
--
作者：
Yue Xiyuan;Zuo Xiaoan;Yu Qiang;Xu Chong;Lv Peng;Zhang Jing;Knapp Alan K.;Smith Melinda D.
了解气候变化，特别是极端气候对植物功能性状的影响，可以为预测植物群落未来如何改变提供机制基础。在这里，我们重点关注内蒙古典型温带草原的优势种羊草（Leymus chinensis (Trin.) Tzvei），以研究植物功能性状对沿着干旱梯度的三个地点实验施加的极端干旱的响应。比较最干旱（高干旱）和最湿（低干旱）的地点时，中度和低度干旱地点的株高、叶片干物质含量和δ13C（水分利用效率）增加，而高干旱地点的比叶面积和叶片氮含量降低。当在所有站点实验施加极端干旱（生长季降水量减少约 66%）时，中度和低度干旱站点的羊草株高降低，δ13C 增加。降水量减少 66% 的极端干旱也增加了高干旱和低干旱地区的叶片干物质含量。与对照（环境降水量）相比，极端干旱增强了株高与 δ13C 之间的正相关性，以及特定叶面积与株高和叶片干物质含量之间的负相关性。因此，极端干旱改变了内蒙古草原优势草的关键功能性状，特别是在低干旱地区，干旱使植物尺寸减小，水分利用效率增加，并影响这些性状之间的关系。
Understanding the effects of climate change, in particular, climate extremes on plant functional traits can provide a mechanistic basis for predicting how plant communities may be altered in the future. Here, we focused on a dominant species in Inner-Mongolia typical temperate steppe, Leymus chinensis (Trin.) Tzvei, to examine the responses of plant functional traits to experimentally imposed extreme drought at three sites along an aridity gradient. When comparing the driest (high aridity) to the wettest sites (low aridity), plant height, leaf dry matter content and δ13C (water use efficiency) were increased at the intermediate and low aridity sites, whereas specific leaf area and leaf nitrogen content were reduced at the high-aridity site. When extreme drought (~ 66% reduction in the growing season precipitation) was experimentally imposed at all sites, plant height decreased and δ13C of L. chinensis increased at the intermediate and low aridity sites. The extreme drought of 66% precipitation reduction also increased leaf dry matter content in high- and low-aridity sites. Compared to the control (ambient precipitation), extreme drought increased the strength of the positive association between plant height and δ13C, as well as the negative associations of specific leaf area with plant height and leaf dry matter content. Thus, extreme drought altered key functional traits of the dominant grass of Inner Mongolia steppe, particularly at the low-aridity site where the drought decreased plant size and increased water use efficiency and affected relationships between these traits.
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影响因子：
3.7
作者：
Debouk H;de Bello F;Sebastià MT
通讯作者：
Sebastià MT
影响因子：
2.7
作者：
S. Rosbakh;C. Römermann;P. Poschlod
通讯作者：
S. Rosbakh;C. Römermann;P. Poschlod
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影响因子：
4.9
作者：
Gao, Ruiru;Yang, Xuejun;Walck, Jeffrey L.
通讯作者：
Walck, Jeffrey L.
影响因子：
4
作者：
N. Marron;E. Dreyer;E. Boudouresque;D. Delay;J. Petit;F. Delmotte;F. Brignolas
通讯作者：
N. Marron;E. Dreyer;E. Boudouresque;D. Delay;J. Petit;F. Delmotte;F. Brignolas
影响因子：
3.7
作者：
Kreyling, Juergen;Khan, Mohammed A. S. Arfin;Jentsch, Anke
通讯作者：
Jentsch, Anke