Impacts of elevated atmospheric CO2 and temperature on plant community structure of a temperate grassland are modulated by cutting frequency
Impacts of elevated atmospheric CO2 and temperature on plant community structure of a temperate grassland are modulated by cutting frequency
复制标题
DOI：
10.1111/j.1365-2494.2004.00414.x
复制
发表时间：
2004-06-01
影响因子：
2.4
通讯作者：
Ashenden, TW
中科院分区：
文献类型：
--
作者：
Harmens, H;Williams, PD;Ashenden, TW
为了确定气候变化和落叶对半天然温带草原的群落结构和植物多样性的影响，永久性草原的整料暴露于环境或升高的大气CO2浓度（环境+ 235 ppmv）和温度（环境+ VC）从1998年10月至2000年12月。整料经受两种不同的切割频率，每年两次或六次切割。草地群落结构在实验过程中发生了变化，对管理的变化比对气候的变化更敏感。采伐频率的增加通过增加杂类草的数量来刺激植物多样性，但植物多样性并没有受到气候变化的显著影响。个别植物物种的植被覆盖的贡献揭示了物种特异性的气候变化和切割频率的反应，但大多数物种之间的气候变化和切割频率的显着相互作用。由于气候变化和采伐频率之间存在显著的相互作用，因此处理对年总产量和杂类草比例没有明显的影响。它的结论是，差异化的草地管理将修改植物物种特异性的气候变化的反应，并导致混合物种，温带草原的植物组成的变化。
To determine the impacts of climate change and defoliation on the community structure and plant diversity of a semi-natural temperate grassland, monoliths of a permanent grassland were exposed to ambient or elevated atmospheric CO2 concentrations (ambient + 235 ppmv) and temperature (ambient + VC) from October 1998 to December 2000. The monoliths were subjected to two different cutting frequencies, either two or six cuts per year. The grassland community structure changed during the course of the experiment and was more responsive to changes in management than to changes in climate. Increased cutting frequency stimulated plant diversity by enhancing the number of forb species, but plant diversity was not significantly affected by climate change. The contribution of individual plant species to the vegetation cover revealed species-specific responses to climate change and cutting frequency, but for most species significant interactions between climate change and cutting frequency were present. There were no clear-cut effects of treatments on the total annual yield and the proportion of forbs present, as significant interactions between climate change and cutting frequency occurred. It is concluded that differential grassland management will modify plant species-specific responses to climate change and resulting changes in the botanical composition of mixed-species, temperate grasslands.