Flowering phenology of six woody plants in the northern Sonoran Desert

Bulletin of the Torrey Botanical Club Pub Date : 1994-07-01 DOI:10.2307/2997177

J. E. Bowers, M. Dimmitt, A. Mark, A. Gray

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引用次数: 90

Abstract

BowERs, JAIcE E. (U.S. Geological Survey, 1675 W. Anklam Road, Tucson, AZ 85745) AND MARK A. DIMMITr (Arizona-Sonora Desert Museum, 2021 N. Kinney Road, Tucson, AZ 85743). Flowering phenology of six woody plants in the northern Sonoran Desert. Bull. Torrey Bot. Club 121: 215-229. 1994.-Climatic and flowering data from a site in the northern Sonoran Desert of southern Arizona were used to define flowering triggers and developmental requirements for 6 woody plants. These formulations were then used to predict flowering dates at a second northern Sonoran Desert site. It was determined that flowering is triggered by rain in Larrea tridentata (DC.) Cov., Fouquieria splendens Engelm., Encelia farinosa A. Gray, Ambrosia deltoidea (A. Gray) Payne and Acacia constricta Benth., and that flowering is triggered by photoperiod in Cercidium microphyllum (Torr.) Rose & Johnst. The base temperature for floral development in L. tridentata, F. splendens, E. farinosa, A. deltoidea and C. microphyllum is about 10?C. Their mean degree-day requirements range from 414 to 719. Acacia constricta requires 522 degree-days above 15?C. Minimum rainfall triggers varied from 9 mm forAmbrosia to 20 mm for Encelia. Flowering time in C. microphyllum may reflect phylogenetic constraints, while flowering time in F. splendens may be strongly influenced by pollinator availability. Flowering times of the remaining species seem constrained more by climate than by biotic considerations such as phylogeny, seed germination and competition for pollinators.

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索诺兰沙漠北部六种木本植物的开花物候特征

杰斯·鲍尔斯(美国地质调查局，1675年)。安克兰路，图森，亚利桑那州85745)和马克·a·迪米特(亚利桑那-索诺拉沙漠博物馆，n.k inney路2021，图森，亚利桑那州85743)。索诺兰沙漠北部六种木本植物的开花物候特征。公牛。托里机器人。俱乐部121:215-229。1994.-使用亚利桑那州南部索诺兰沙漠北部一个地点的气候和开花数据来定义6种木本植物的开花触发因素和发育要求。然后，这些公式被用来预测索诺兰沙漠北部第二个地点的开花日期。结果表明，三叉戟Larrea tridentata (DC)的开花是由雨水引起的。浸。恩格尔氏富氏菌。、金合欢(A. Gray)、金合欢(A. Gray)、金合欢(Acacia constricta Benth)。小叶Cercidium microphyllum (Torr.)的开花是由光周期触发的。Rose & Johnst。三叉草、锦绣草、粉叶草、三角草和小叶草的花发育基础温度约为10℃。他们的平均学位日要求在414到719天之间。金合欢需要522度的高温。最小降雨量触发点从安布罗西亚的9毫米到恩塞利亚的20毫米不等。小叶锦鸡儿的开花时间可能反映了系统发育的限制，而锦鸡儿的开花时间可能受到传粉者可用性的强烈影响。其余物种的开花时间似乎更多地受到气候的限制，而不是生物因素，如系统发育、种子发芽和传粉者的竞争。

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Bulletin of the Torrey Botanical Club

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