内蒙古地带性针茅植物对CO_2和气候变化的适应性研究进展  

Advances in the adaptability of zonal Stipa plants to CO_2 and climate change in Inner Mongolia

作　　者：蒋延玲[1] 周广胜[1,2] 王玉辉[1] 王慧[1,3] 石耀辉[1,3] 

机构地区：[1]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 [2]中国气象科学研究院,北京100081 [3]中国科学院大学,北京100049

出　　处：《生态学报》2015年第14期4559-4569,共11页Acta Ecologica Sinica

基　　金：国家重点基础研究发展计划(973计划)(2010CB951303);中国科学院战略性先导科技专项-应对气候变化的碳收支认证及相关问题(XDA05050408)

摘　　要：收集了1992—2013年关于模拟CO2浓度升高及气候变化(温度升高、降水变化)对内蒙古地带性草原群落的5个建群种针茅植物(贝加尔针茅、本氏针茅、大针茅、克氏针茅、短花针茅)影响的实验研究结果表明,模拟CO2浓度升高、增温和增雨将提高针茅植物的光合作用和株高生长,但CO2处理时间延长会导致光合适应;温度和降雨变化将改变针茅植物的物候进程,但物种之间反应有差异;CO2浓度升高有助于针茅植物生物量增加,增温和干旱则相反,CO2浓度升高对干旱的影响具有补偿作用;干旱和涝渍胁迫将提高针茅植物植株C/N,CO2浓度升高将加剧水分胁迫下针茅植物植株C/N的增加效应,导致牧草品质下降。由于当前在适应性指标、针茅植物对气候变化协同作用的适应机理及其敏感性研究等方面存在的不足,导致目前无法全面比较各针茅植物对CO2和温度、降水变化的响应差异及其敏感性,因而无法预测未来在全球变化背景下,这几种针茅植物的动态变化及其在地理分布上的迁移替代规律。为科学应对气候变化,未来应加强内蒙古地带性针茅植物的适应性指标、针茅植物对多因子协同作用的适应机理及敏感性研究。Stipa plants, distributed in arid and semi-arid regions, are sensitive to drought caused by the decrease of precipitation and changes of other climatic factors. What the effects of global change on Stipa plants were studied would help to understand the response and adaptability of zonal steppe plants to global change in Inner Mongolia. The impacts of elevated CO2, warming and precipitation change on five zonal and constructive Stipa species （S. Baicalensis, S. bungeana, S. grandis, S. krylovii and S. breviflora） in Inner Mongolia were reviewed based on simulating experimental results from 1992 to 2013. The main objective is to reveal the response and adaptation mechanism of the zonal Stipa plants to CO2 and climate change in Inner Mongolia, and we hope to provide sound knowledge for further studying the effects of global change on the zonal Stipa plants. Increasing CO2 concentration, temperature and precipitation all enhanced the photosynthesis and height of Stipa plants, while the plant photosynthetic acclimation would appear with the processing time longer of CO2 treatment. Temperature and precipitation changes would affect the phenological process of Stipa plants, but the responses to temperature and precipitation change were different among different species. Elevated CO2 increased and warming and drought decreased the biomass of Stipa plants. Elevated CO2 could alleviate the effect of drought on plant photosynthesis and growth. Drought and water logging stress increased C/N of Stipa plants, and elevated CO2 would aggravate the C/N of Stipa plants under drought. Therefore, the forage quality would decrease. Although many simulations of the adaptability of zonal Stipa plants to CO2 and climate change in Inner Mongolia had been done, there were still a lot of insufficiencies as follows ： （1） Lack of study on the adaptability indexes： Many researches focus on the responses of the physiological ecology, structural and functional characteristics of Stipa plants to CO2 and climate change. But the relati

关 键 词：适应性 CO2浓度升高 温度升高 降水变化 针茅植物 

分 类 号：Q948[生物学—植物学]