SEEDLING RECRUITMENT OF FORB SPECIES UNDER EXPERIMENTAL MICROHABITATS IN ALPINE GRASSLAND
文献类型: 外文期刊
作者: Tian Fu-Ping 1 ; Liu Yu 2 ; Wu Gao-Lin 2 ; Shi Shang-Li 1 ;
作者机构: 1.Gansu Agr Univ, Coll Grassland Sci, Lanzhou 730070, Gansu, Peoples R China
2.Northwest A&F Univ, Chinese Acad Sci, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Fanning Loess P, Yangling 712100, Shaanxi, Peoples R China
3.Chinese Acad Agr Sci, Lanzhou Inst Husb & Pharmaceut Sci, Lanzhou Sci Observat & Expt Field Stn, Minist Agr Ecol Syst,Loess Plateau Area, Lanzhou 730050, Gansu, Peoples R China
关键词: Alpine meadow;Light;Nutrient;Seed mass;Seedling emergence
期刊名称:PAKISTAN JOURNAL OF BOTANY ( 影响因子:0.972; 五年影响因子:0.988 )
ISSN: 0556-3321
年卷期: 2015 年 47 卷 6 期
页码:
收录情况: SCI
摘要: Which factors limit plant seedling recruitment in alpine meadow of the Qinghai-Tibetan Plateau (QTP), China? This study examined the relative influence of seed mass and microsites (resulted from grazing disturbance) on field seedling emergence and survival of nineteen alpine herbaceous species with a range of traits in QTP. Seed mass had significant effects on seedling emergence and survival eliminating influence of light and nutrient variances among these species. The larger-seed species had more advantageous than the smaller-seed species in seedling survival, but it was disadvatage for seedling emergence, especially under high nutrient availability and low light intensity conditions. Light had obvious effects on seedling survival, but less effects on seedling emergence for these species. Moreover, nutrient and light treatments altered the regression relationships of seed mass and seedling emergence and survival and the order of significances was L25>L50>L100>L10>L4. These results suggested that seed mass may restrict seedling recruitment processes, however, light and nutrient availability all have significant effects on seedling emergence and survival for these alpine species. Moderate light intensity was propitious to seedling emergence and survival in alpine grassland. This suggests that ecological factors in alpine grassland provide a stochastic influence on different seed-mass species. These trends may help to explain why many small-seeded species of Asteraceae and Gramineae tend to be more abundant in disturbed habitats.
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