摘要
叶片和茎的生长规律决定植物对光截取的模式以及与外界环境的物质交换面积,其生物量分配是研究植物生活史对策的一个重要途径。在石羊河上游高寒退化草地,采用标准化主轴估计(standardized major axis estimation,SMA)方法,研究了狼毒(Stellera chamaejasme)种群茎大小对茎与叶生物量分配的影响,以及对叶面积支持效率的影响。结果表明:狼毒种群茎干重与比叶重(LMA)、单叶面积、叶干重呈异速生长关系,SMA斜率分别为0.781(95%的置信区间,CI=0.71～0.94)、0.824(CI=0.77～0.95)和0.856(CI=0.79～0.99)。狼毒种群中较大茎的狼毒植株具有较高的叶生物量分配比例和叶面积支持效率,同时具有较高的比叶重,说明较大的狼毒采取以提高资源利用效率为主的适应策略,而相对较小的狼毒采取以快速生长为主的适应策略。
The growth patterns of leaf and stem decide the light capture pattern of plants and the acreage of the material exchange between plants and external environment, whereas the biomass allocation is a main approach to study the plant life history strategies. Taking the degraded alpine grassland in the upper reaches of Shiyang River, Gansu Province of Northwest China as a case, the method of standardized major axis （ SAM ） estimation was adopted to study the effects of Stelle- ra chamaejasme stem size on the biomas8 allocation in leaf and stem, and on the leaf area sup- porting efficiency. There existed an allometrie relationship between the stem dry mass and the LMA, individual leaf area, and leaf dry mass, with a SMA slope of 0.781 （95 % confidence in- terval, CI= O. 71-0.94） , 0. 824 （ CI= O. 77-0.95 ）, and 0. 856 （ CI = O. 79-0.99 ） , respec- tively. The S. chamaejasme with bigger stem had higher leaf biomass allocation percentage and leaf area supporting efficiency, and in the meantime, had higher LMA, indicating that the bigger S. chamaejasme mainly adopted an adaptive strategy of high resource-use efficiency, while the smaller one mainly employed an adaptive strategy of fast growth.
出处
《生态学杂志》
CAS
CSCD
北大核心
2013年第2期241-246,共6页
Chinese Journal of Ecology
基金
国家自然科学基金项目(91125014和40971039)
甘肃省科技支撑计划项目(1011FKCA157)
甘肃省生态经济重点学科项目资助
关键词
石羊河
狼毒
茎干重
叶干重
单叶面积
异速生长
Shiyang River
Stellera chamaejasme
stem dry mass
leaf dry mass
individual leafarea
allometric growth.
