Amthor Jeffrey S, Gill David S, Bormann F Herbert
School of Forestry and Environmental Studies, Yale University, 06511, New Haven, CT, USA.
Oecologia. 1990 Aug;84(1):93-98. doi: 10.1007/BF00665600.
Leaf surface conductance and apparent photosynthesis were measured during late summer and autumn on saplings and sprouts of pin cherry (Prunus pensylvanica), yellow birch (Betula alleghaniensis), American beech (Fagus grandifolia), and sugar maple (Acer saccharum) naturally revegetating a site in the northern hardwood forest 5 years following a commercial whole-tree harvest. Prior to the disturbance (i.e., the harvest) the site was codominated by American beech, sugar maple, and yellow birch, whereas after the disturbance pin cherry was the dominant species. Conductance and photosynthetic rate of pin cherry leaves were comparatively high while those of American beech and sugar maple were low. Pin cherry retained green, physiologically active leaves longer into autumn than American beech and sugar maple. The rates and seasonal duration of leaf gas exchange on the disturbed site were therefore greater than they would have been had the site not become dominated by pin cherry.
在商业性全树采伐后的5年，对北部阔叶林一处自然恢复植被的地点上的毛樱桃（Prunus pensylvanica）、黄桦（Betula alleghaniensis）、美国山毛榉（Fagus grandifolia）和糖枫（Acer saccharum）的幼树和新梢，在夏末和秋季测量了叶片表面导度和表观光合作用。在干扰（即采伐）之前，该地点由美国山毛榉、糖枫和黄桦共同主导，而在干扰之后，毛樱桃成为优势种。毛樱桃叶片的导度和光合速率相对较高，而美国山毛榉和糖枫的则较低。毛樱桃比美国山毛榉和糖枫在秋季保持绿色、生理活性叶片的时间更长。因此，受干扰地点的叶片气体交换速率和季节持续时间比该地点未被毛樱桃主导时要高。
