首页 | 本学科首页   官方微博 | 高级检索  
   检索      


The response of mycorrhizal colonization to elevated CO2 and climate change in Pascopyrum smithii and Bouteloua gracilis
Authors:C A Monz  H W Hunt  F B Reeves  E T Elliott
Institution:(1) Natural Resource Ecology Laboratory, Colorado State University, 80523 Fort Collins, CO, USA;(2) Department of Science, Colorado State University, 80523 Fort Collins, CO, USA;(3) Department of Biology, Colorado State University, 80523 Fort Collins, CO, USA;(4) Present address: Research Department, National Outdoor Leadership School, 288 Main Street, 82520 Lander, WY, USA
Abstract:Large intact soil cores of nearly pure stands of Pascopyrum smithii (western wheatgrass, C3) and Bouteloua gracilis (blue grama, C4) were extracted from the Central Plains Experimental Range in northeastern Colorado, USA and transferred to controlled environment chambers. Cores were exposed to a variety of water, temperature and CO2 regimes for a total of four annual growth cycles. Root subsamples were harvested after the completion of the second and fourth growth cycles at a time corresponding to late winter, and were examined microscopically for the presence of mycorrhizae. After two growth cycles in the growth chambers, 54% of the root length was colonized in P. smithii, compared to 35% in blue grama. Field control plants had significantly lower colonization. Elevation of CO2 increased mycorrhizal colonization in B. gracilis by 46% but had no effect in P. smithii. Temperatures 4° C higher than normal decreased colonization in P. smithii by 15%. Increased annual precipitation decreased colonization in both species. Simulated climate change conditions of elevated CO2, elevated temperature and lowered precipitation decreased colonization in P. smithii but had less effect on B. gracilis. After four growth cycles in P. smithii, trends of treatments remained similar, but overall colonization rate decreased.
Keywords:Bouteloua gracilis            climate change  elevated CO2                      Pascopyrum smithii            VA mycorrhiza
本文献已被 SpringerLink 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号