草业学报2013，Vol.22Issue(1)：68-76,9.
草原与荒漠一年生植物性状对降水变化的响应
The responses of annual plant traits to rainfall variation in steppe and desert regions
摘要
Abstract
The responses of phenophase and morphological traits of four kinds of annual species in steppe and desert regions in Inner Mongolia to rainfall variation were analyzed by an experiment in which four precipitation gradients (5, 20,70 and 150 mm) were used to simulate effective rainfall in steppe and desert regions. The growing season of annual plant groups in these regions is usually 40 to 90 (＜100＝ days. The growing season, plant height, leaf length, and biomass of annual plants increased with an increase of rainfall. The life history of annual plants can basically be completed with 5 mm effective rainfall, but their growth and propagation are best in 70 mm effective rainfall. The change of phenophase in Salsola collina was smaller than that of other annual short grasses, and was done by adjusting the length of the reproductive stage and reducing fruit bearing as a response to lack of rainfall. Annual short grass can adjust the length of every phenophase to adapt its growth and reproduction to rainfall variation. In the same conditions of rainfall, the growing time of annual short grass is relatively longer than that of S. collina but the latter showed stronger drought-avoidance ability, while annual short grass has stronger drought-resistance ability in its adaption strategies.关键词
一年生植物/植物性状/模拟降水/物候/适应策略Key words
annual plant/ plant traits/ simulated rainfall/ phenophase/ adaptation strategies分类
农业科技引用本文复制引用
闫建成,梁存柱,付晓玥,王炜,王立新,贾成朕..草原与荒漠一年生植物性状对降水变化的响应[J].草业学报,2013,22(1):68-76,9.基金项目
国家自然科学基金资助项目(30660119)和国家基础科学人才培养基金资助项目(J0730648)资助. （30660119）
