[Characteristics of Stipa grandis growth and reproductive biomass allocation at different hill position of Xilingol grassland, Inner Mongolia].
An investigation was conducted on the vegetative and reproductive biomass allocation of Stipa grandis at the hill-top and hill-foot of Xilingol grassland, and relatedness- and factor analyses were made to study the effects of hill position on the S. grandis seed biomass. Significant differences were observed in the vegetative and reproductive growth of S. grandis plants at the hill-top and hill-foot. At hill-foot, the height and number of non-flowering S. grandis ramets increased by 24.69% and 35.37%, respectively, the number of flowering ramets increased by 102.97%, the vegetative, reproductive, and total biomass increased by 44.14%, 95.59% and 47.45%, respectively, and the 100-grain mass increased by 25.00%, as compared with those at hill-top. The seed biomass of S. grandis at hill-top was mainly affected by soil moisture content, while that at hill-foot was mainly affected by soil pH. Hill position induced the differentiation of soil moisture and N contents, and made the S. grandis at the fertile hill-foot allocating more energy to its sexual reproduction.
Gao
Hui
H
College of Life Science, Nankai University, Tianjin 300071, China. huigao8156@mail.nankai.edu.cn
Gao
Yu-bao
YB
Liu
Hai-ying
HY
Liu
Jing-ling
JL
D018533:Biomass; D002681:China; D017753:Ecosystem; D006863:Hydrogen-Ion Concentration; D006109:Poaceae / Q000254:growth & development* / Q000502:physiology; D012098:Reproduction / Q000502:physiology; D012987:Soil / Q000032:analysis; D014867:Water / Q000032:analysis
D012987:Soil; D014867:Water