Patterns of Reproductive and Seed Dispersal and Ecological Significance of the Clonal Spring Ephemeroid Plant Carex physodes in the Gurbantuggut Desert
Patterns of Reproductive and Seed Dispersal and Ecological Significance of the Clonal Spring Ephemeroid Plant Carex physodes in the Gurbantuggut Desert
复制标题
古尔班图古特沙漠克隆春季蜉蝣植物苔草的繁殖和种子传播模式及其生态意义
DOI：
10.1590/s0100-83582018360100007
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发表时间：
2018-01-01
期刊：
影响因子：
0.8
通讯作者：
GUAN, K.
中科院分区：
文献类型：
--
作者：
ABUDUREHEMAN, B.;CHEN, Y.;GUAN, K.
水囊苔草是我国西北地区古尔班通古特寒冷沙漠中的一种短命物种。它既有无性生殖模式，也有有性生殖模式。本研究的主要目的是描述生殖系统的特征，并确定果实传播在有性生殖中的作用。囊突。地上和地下生物量、根冠比、花序生物量、座果率;对自然生境和室内条件下的裸子植物和瘦果的扩散进行了研究。C.海鞘的生物量约为地上生物量的10倍。地上生物量的绝大部分分配给花序，说明白刺的地上生物量主要集中在花序上。囊藻将大部分生物量分配给生殖部分。C.囊果产生具有包含一个瘦果的果皮的周果。在1和4 m s（-1）风速下，周果枝的扩散距离远大于瘦果，且周果枝在水中的漂浮时间远大于瘦果。周果木比瘦果具有更强的持水能力和更好的粘土能力，表明周果木不仅适合风力传播，而且还适合通过降雨进行远距离传播。然而，瘦果可能会留在母株附近，只在短距离内分散。C.通过与根状茎和周果相关的特征的组合，囊蕨在形态和生理上适应寒冷的沙漠环境。这种适应性可能增加了红腹锦鸡儿的生存机会和种群扩展。囊突。
Carex physodes is an ephemeral species in the cold desert of Gurbantunggut in Northwest China. It has both asexual and sexual reproductive patterns. The primary aims of this study were to characterize the reproduction systems and identify the role of fruit dispersal in the sexual reproduction of C. physodes. Aboveground and underground biomass, root-shoot ratio, inflorescence biomass, fruit-set of C. physodes were measured and dispersal of perigynia and achenes in the natural habitat and indoor condition were studied. The underground biomass of C. physodes was approximately 10 times more than the aboveground biomass. The most parts of aboveground biomass is allocated to the inflorescence, which suggests that C. physodes allocates most biomass to the reproductive part. C. physodes produces perigynium with a pericarp containing one achene. The perigynia disperse at a much greater distance than achenes at both 1 and 4 m s(-1) wind velocity, and the floating time of perigynia in water was much longer than that of achenes. Perigynia can hold more water and adher soil much more easily than achenes, which suggests that perigynia are suitable for wind dispersal, and they also adapt to spread at a long distance by occasionally rainfall. However, achenes may remain near the mother plants and only disperse at short distances. C. physodes is morphologically and physiologically adapted to the cold desert environment via a combination of characters associated with the rhizomatous and perigynium. This adaption may increase the opportunity of survival and expansion of population of C. physodes.