祁连山北坡霸王花大小-数量权衡关系的坡向差异  

Trade-off relationship between the flower biomass and number of Zygophyllum xanthoxylum on different slope aspects in northern slope of Qilian Mountains

作　　者：韩玲[1] 赵成章[1] 徐婷[1] 段贝贝 郑慧玲[1] 冯威[1] 

机构地区：[1]西北师范大学地理与环境科学学院甘肃省湿地资源保护与产业发展工程研究中心,兰州730070

出　　处：《生态学杂志》2016年第6期1497-1503,共7页Chinese Journal of Ecology

基　　金：国家自然科学基金项目(91125014和40971039);甘肃省生态学重点学科资助

摘　　要：权衡关系是植物生活史对策理论的基础,花大小-数量的权衡关系对理解花构件的资源分配具有重要意义。本文采用GIS与实验生态学相结合的方法,研究了祁连山北坡荒漠草原不同坡向霸王(Zygophyllum xanthoxylum)花大小-数量的关系。结果表明:随着坡向由北坡向东坡、西坡、南坡转变,草地植物群落的高度、密度、地上生物量、土壤含水量以及霸王的花大小、分枝数和枝干重呈逐渐减小趋势,霸王的花数量和繁殖分配逐渐增大;北坡和南坡霸王的花大小和花数量之间呈极显著负相关(P<0.01),异速斜率显著小于-1,东坡和西坡霸王的花大小和花数量之间呈显著负相关(P<0.05),异速斜率接近于-1。不同坡向霸王在花大小与花数量间"此消彼长"的资源分配权衡关系,反映了植物优化生境适应性的种群繁殖策略。Trade-off is the basis of the theory on plant life-history strategies,and the trade-off between flower size and flower number is an important determinant of flower biomass allocation. In this study,GIS and the method of experimental ecology were used to study the relationship between flower size and number of Zygophyllum xanthoxylum in response to slope aspects located in desert grasslands on the northern slope of Qilian Mountains,Northwest China. The results showed that the height,density,above-ground biomass,soil moisture content of the plant community and flower size,twig number,dry weight of Z. xanthoxylum displayed a pattern of gradual decrease with the aspect turning from north,east,west to south,while the flower number and reproductive allocation of Z. xanthoxylum displayed a pattern of gradual increase. The flower size was highly significantly negatively correlated with flower number on the north slope and south slope（ P〈0.01）,and the slopes of the regressions were significantly less than-1,whereas it was significantly negatively correlated with flower number on the east slope and west slope（ P〈0.05）,and the slopes of the regressions were close to-1. The trade-off relationship of resource allocation between the flower size and flower number of Z. xanthoxylum in different slope aspects reflected the population reproduction strategy via optimizing habitat adaptability of plant.

关 键 词：坡向 花数量 花大小 霸王 权衡 荒漠 

分 类 号：Q948[生物学—植物学]