Differential responses of plant functional trait to grazing between two contrasting dominant C3 and C4 species in a typical steppe of Inner Mongolia, China
Differential responses of plant functional trait to grazing between two contrasting dominant C3 and C4 species in a typical steppe of Inner Mongolia, China
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DOI：
10.1007/s11104-010-0369-3
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发表时间：
2011-03
期刊：
影响因子：
4.9
通讯作者：
Shuxia Zheng;Zhichun Lan;Wenhuai Li;Rui Shao;Yumei Shan;H. Wan;F. Taube;Yongfei Bai
中科院分区：
文献类型：
--
作者：
Shuxia Zheng;Zhichun Lan;Wenhuai Li;Rui Shao;Yumei Shan;H. Wan;F. Taube;Yongfei Bai
植物功能性状已被广泛用于研究环境驱动因素、植物内部不同功能之间的权衡以及生态系统结构和功能之间的联系。在2008年(丰水年)和2009年(枯水年)，对内蒙古中国草原优势种羊草(C3多年生根茎草)和隐子草(C4多年生束草)的全株性状、叶片形态和生理特性进行了放牧试验。结果表明，在大多数情况下，放牧率、放牧率和放牧率 × 对整株性状和叶片形态生理性状的影响均达到极显著水平。植物性状对降水变化的不同响应是干湿年性状权衡的结果。放牧条件下，羊草多雨年N含量高，净光合速率(Pn)高，干旱年N含量低，净光合速率低。FC的特质权衡。平方在干旱年具有较高的比叶面积和Pn值，而在多雨年具有较低的SLA和Pn值。我们的发现还表明，c.石鸡对放牧的抵抗力强于L。在回避和耐性特征方面，特别是在重放牧压力和干旱年份。
Plant functional traits have been widely used to study the linkage between environmental drivers, trade-offs among different functions within a plant, and ecosystem structure and functioning. Here, the whole-plant traits, leaf morphological and physiological traits of two dominant species,Leymus chinensis(C3perennial rhizome grass) andCleistogenes squarrosa(C4perennial bunchgrass), were studied in the Inner Mongolia grassland of China, with a grazing experiment including five stocking rates (0, 3.0, 4.5, 7.5, and 9.0 sheep/ha) in 2008 (wet year) and 2009 (dry year). Our results demonstrated that, for both species, the effects of stocking rate, year, and stocking rate × year on whole-plant traits and leaf morphological and physiological traits were highly significant in most cases. The differential responses of plant trait to variation in precipitation were caused by trait trade-offs between the wet and dry years.L. chinensisadopted the high N content and net photosynthetic rate (Pn) in the wet year but both the low N content and Pnin the dry year under grazed conditions. The trait trade-offs ofC. squarrosawere characterized by high specific leaf area (SLA) and Pnin the dry year vs. low SLA and Pnin the wet year. Our findings also indicate thatC. squarrosais more resistant to grazing thanL. chinensisin terms of avoidance and tolerance traits, particularly under heavy grazing pressure and in the dry year.