Foraging responses of clonal plants to multi-patch environmental heterogeneity: spatial preference and temporal reversibility
Foraging responses of clonal plants to multi-patch environmental heterogeneity: spatial preference and temporal reversibility
复制标题
克隆植物对多斑块环境异质性的觅食反应：空间偏好和时间可逆性
DOI：
10.1007/s11104-012-1148-0
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发表时间：
2012-10-01
期刊：
影响因子：
4.9
通讯作者：
Wang, Ying
中科院分区：
文献类型：
--
作者：
Gao, Ying;Xing, Fu;Wang, Ying
背景和目的植物根系的放置是高度可塑的，以获得斑块分布的营养物质，并确保其生存，生长和繁殖。考虑到克隆器官的空间延伸，我们选择了两种克隆植物羊草（Leymus chinensis（Trin.）茨维尔和Hierochalus glabraTrin.）以确定环境异质性对地下器官和新生分株的时空效应。MethodsSmall-scale和多斑块异质性环境进行了操纵，通过创建四个补丁填充不同类型的土壤在同一盆。4个斑块分别由桑迪土、桑迪、壤土和腐殖土组成。通过测量各斑块内的分枝数、芽数、平均间隔长度、根茎长度和生物量分配，确定植物的觅食反应。土壤养分有效性以腐殖土斑块最高，而H. glabra更喜欢分株在桑迪壤土和壤土斑块。当生长在均匀的环境中，两个物种随机扎根在四个隔间的后代分株。在异质环境中，分株位置、地上生物量和总根茎长度均表现出觅食反应。然而，在异质环境中，四种类型的补丁之间的芽数或地下生物量没有差异，这可能表明，将不会有补丁间的差异，在未来year.ConclusionsPlants幼苗建立显示出选择性分配的后代分株的优先补丁中存在的多补丁环境异质性。响应H。glabrato多斑块异质性比L.中国，表明觅食模式是种特异性的。克隆植物可以迅速响应环境异质性，而觅食反应可能是可逆的，在一个较长的时间尺度。
Background and aimsPlant root placement is highly plastic in order to acquire patchily distributed nutrients and to ensure their survival, growth and reproduction. Considering the spatial extension of clonal organs, we selected two clonal plants (Leymus chinensis(Trin.) Tzvel. andHierochloe glabraTrin.) to determine the spatio-temporal effects of environmental heterogeneity on belowground organs and newly-born ramets.MethodsSmall-scale and multi-patch heterogeneous environments were manipulated by creating four patches filled with different types of soil in a same pot. The four patches were composed of sandy soil, sandy loam, loam soil and humus soil, respectively. Ramet number, bud number, mean spacer length, rhizome length, and biomass allocation within each patch were measured to identify plant foraging responses.ResultsThe preferential patch ofL. chinensiswas humus soil patch which was the highest in nutrient availability, whereasH. glabrapreferred to place ramets in sandy loam and loam soil patches. When growing in homogeneous environments, both species randomly rooted their offspring ramets in the four compartments. In heterogeneous environments, foraging responses were detected in ramet placement, aboveground biomass and total rhizome length. However, there were no differences in bud number or belowground biomass among four types of patches in heterogeneous environments, which might suggest that there would be no inter-patch differences in seedling establishment in the next year.ConclusionsPlants show selective allocation of offspring ramets to preferential patches in the presence of multi-patch environmental heterogeneity. Responses ofH. glabrato multi-patch heterogeneity were faster than those ofL. chinensis, demonstrating that the foraging patterns are species-specific. Clonal plants can rapidly respond to environmental heterogeneity, whereas foraging responses are potentially reversible over a longer temporal scale.