氮、磷添加对亚高山草甸地上/地下生物量分配的影响  

Effects of N, P addition on above/below ground biomass allocation in a subalpine meadow

作　　者：辛小娟[1] 王刚[2] 杨莹博[2] 任正炜[2] 

机构地区：[1]陕西省石油化工研究设计院,西安710054 [2]兰州大学生命科学学院,兰州730000

出　　处：《生态科学》2014年第3期452-458,共7页Ecological Science

基　　金：国家自然科学基金面上项目(31270472);中央高校基本科研业务费专项资金(lzujbky-2012-108)

摘　　要：一直以来,关于根冠对N、P响应机制及地上/地下生物量分配假说在生态学研究中存在较大争论。以甘南亚高山草甸作为研究对象,通过添加氮磷元素,并测定土壤理化指标、地上地下生物量,以此研究亚高山草甸植物群落地上地下生物量分配动态及其机制以及氮磷对根冠生长的具体影响。结果表明:相对植物根部而言,氮磷共同添加更能促进植物冠部的生长;随着元素的增加,植物根冠比逐渐降低,植物群落由养分限制转变为光限制,植物为了获取最快生长,将更多的生物量分配给地上来截取更充足的光照。由此,验证并支持了最优分配假说。All the time, there have been relatively large debates about the response mechanism of shoot-root to nitrogen and phosphorus and the allocation hypothesis of above/below ground biomass in ecological studies. This study was conducted in the sub-alpine meadow of the Southern Gansu Province in China to study the mechanism and dynamics of the allocation between above- and below-ground biomass, the effects of nitrogen and phosphorus on the growth of shoot-root in plant community, through adding nitrogen and phosphorus elements, and measuring soil chemical contents and above/ below ground biomass. The result indicates that combined addition of nitrogen and phosphorus has a stronger interactive effect on shoot than root; R/S decreases with increasing nutrients addition, the limitation of plant community changes from nutrient to light, and plant allocate more above-ground biomass to capture much more light for achieving fastest-growing. Thus, this study proves and supports optimal partitioning hypothesis.

关 键 词：亚高山草甸 氮磷添加 根冠比 等速生长假说 最优分配假说 

分 类 号：Q14[生物学—生态学]