Comparative water relations of three successional hardwood species in central Wisconsin.
Comparative water relations of three successional hardwood species in central Wisconsin.
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威斯康星州中部三种演替硬木树种的水关系比较。
DOI：
10.1093/treephys/4.3.263
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发表时间：
1988
期刊：
影响因子：
4
通讯作者：
M. Abrams
中科院分区：
文献类型：
--
作者：
M. Abrams
早期演替旱生种美洲青杨（Populus tremuloides Michx.）一个早期演替的中位种，和红槭，在1986年生长季节的四个日期进行了评估，在潮湿和干燥的网站上发生的一个后期演替的物种。林下植被在整个生长季表现为土壤含水量高、光照强度低和水汽压亏缺低。气孔导度和计算蒸腾通量均以紫云英最低。红毛蕨和山毛榉最高;椭圆体除生长季节初期外，山杨的叶水势均低于其它树种。山杨的体积弹性模量Q最高。椭圆形的最低。在整个生长季中，山杨和青杨的生长量最大。ellipsoidalis，而不是A.红，表现出在完全和零膨压的渗透势下降。随着相对含水量的降低，山杨的叶水势和膨压下降幅度最大。
Water relations of co-occurring understory saplings of Quercus ellipsoidalis E.J. Hill, an early successional, xeric species, Populus tremuloides Michx., an early successional, mesic species, and Acer rubrum L., a late successional species that occurs on both wet and dry sites, were evaluated on four dates during the 1986 growing season. The understory was characterized by high soil water content, low irradiance and low vapor pressure deficit throughout the growing season. Stomatal conductance and calculated transpiration flux were lowest for A. rubrum and highest for P. tremuloides and Q. ellipsoidalis. Except early in the growing season, leaf water potentials were lower in P. tremuloides than in the other species. Populus tremuloides had the highest bulk modulus of elasticity, Q. ellipsoidalis the lowest. Over the growing season, Populus tremuloides and Q. ellipsoidalis, but not A. rubrum, exhibited a decrease in osmotic potential at both full and zero turgor. Of the three species, Populus tremuloides exhibited the sharpest decrease in leaf water potential and turgor pressure with decreasing relative water content.