中国东北样带羊草群落C_3和C_4植物功能群生物量及其对环境变化的响应  

The biomass of C_3 and C_4 plant function groups in Leymus chinensis communities and theirs response to environmental change along Northeast China transect

作　　者：韩梅[1] 杨利民[1] 张永刚[1] 周广胜[2] 

机构地区：[1]吉林农业大学吉林省生态恢复与生态系统管理重点实验室,长春130118 [2]中国科学院植物研究所植被数量生态重点实验室,北京100093

出　　处：《生态学报》2006年第6期1825-1832,共8页Acta Ecologica Sinica

基　　金：国家重点基础研究发展规划资助项目(G1999043407);省部共建国家重点实验室培育基地-吉林省生态恢复与生态系统管理重点实验室开放基金资助项目(DS2004-20)~~

摘　　要：在全球动态植被模型的发展中,受限于人力、物力和财力使得在物种水平上的研究变得既不可能也无必要。植物功能群的划分是从生态学的,而不是系统发育的角度来相互比较地对待不同地区的植物,从而削减了植被变化研究中植物分类群的数量,已成为研究植被变化及生物多样性对生态系统功能作用的重要单位。植物的不同光合途径(C3、C4和CAM)从叶片组织结构到生理功能,从生态适应到地理分布均表现出对不同水、热、光环境的响应,是理想的植物功能群分类。为此,分析了中国东北样带以羊草(Leymus chinensis)为建群种或共建种的草原群落植物光合类型功能群生物量及其与群落初级生产力和环境变化的关系。结果表明:(1)C4植物生物量具有明显的变化规律,且对环境变化的响应显著,其变异性较高,更能反映样地间环境变化的差异;(2)C4与C3植物变化具有明显的互补性,并且多数C4植物常在逆境中起到更大作用,如干旱化、盐碱化和放牧干扰;(3)C4植物种类少,在所有调查样方中仅出现7种,占总出现种类的9.72%。这些特点说明C4植物可以考虑作为评估和预测我国温带草原植被及其生态系统变化的重要植物功能群。In the development of dynamic global vegetation model, under the limit of manpower, material and financial resources, the studies on species level not only were unlikely, but also were unnecessary. Plant function groups differentiated the plants of different regions from ecological aspect but not from system develop aspect, consequently the number of plants was put down. Now plant function groups have been the important units studying global vegetation change and the ecosystem function of biodiversity.The different photosynthesis approaches of plant, C3 , C4 and CAM, showed the different response to water, temperature and light from leaf tissue structure to physiological function and from ecological adaptability to geographical distribution. Therefore plant photosynthetic groups were some perfect plant function groups analyzing global vegetation change. Using Northeast China Transect （NECT） as our study flat roof, we analysed the relations of plant photosynthetic function groups （ C3 and C4 plants） and community biomass and environment changes in the grassland communities that Leymus chinensis is an edificatory of communities. Our sampling area are located in the steppe segment （125°- 115°E） of NECT using 43.5°N as middle axes. From east to west, they are in turn the Changehun agricultural area （ 123°-125°E） in the center of Northeast China Plain, the meadow and meadow steppe area （122°-124°E） in the south of Songnen Plain, the Kerqing sandlot steppe area （119°- 123°E） in the middle of Songliao Plain, the type steppe area （ 113°- 119°E） in the center of Inner Mongolia Altiplano and the desert steppe area （ 108°-113°E） in the northeast of Ulanzabu Altiplano. All studied zone covered 1000km. Although our sampling area are basically a same latitude, but from east to west the sampling site is gradually elevatory in height above sea level （from 240m to 1480m） and is farther and farther from sea, hence the water and heat condition of sampling area is worse and worse. The

关 键 词：中国东北样带 羊草群落 C3和C4植物功能群 生物量 环境变化 

分 类 号：Q948[生物学—植物学]