Shaver Gaius R
Marine Biological Laboratory, The Ecosystems Center, 02543, Woods Hole, MA, USA.
Oecologia. 1981 Jul;49(3):362-365. doi: 10.1007/BF00347599.
Effects of variable mineral nutrient status on evergreen leaf longevity were investigated in a field fertilization experiment, and by comparison of plants from several sites. The species studied was Ledum palustre spp. decumbens, with a normal leaf life expectancy of 2.06 years and a maximum leaf longevity of 4.5-5.0 years. Most leaf losses took place during the growing season, not during the winter. Fertilization increased leaf production but decreased leaf survivorship. Total number of leaves per stem was unchanged with fertilization. In a comparison among sites, there was a moderate negative correlation between plant N and P concentrations and leaf longevity. These intraspecific responses are similar to known interspecific changes along nutrient gradients, i.e. with high nutrient availability a vegetation should become more "deciduous" and less "evergreen".
在一项田间施肥实验中，通过比较来自多个地点的植物，研究了可变矿物质营养状况对常绿树叶寿命的影响。所研究的物种是平卧杜香，其正常叶预期寿命为2.06年，最大叶寿命为4.5 - 5.0年。大多数叶片损失发生在生长季节，而非冬季。施肥增加了叶片产量，但降低了叶片存活率。每茎总叶数不受施肥影响。在不同地点的比较中，植物氮和磷浓度与叶寿命之间存在适度的负相关。这些种内反应类似于已知的沿养分梯度的种间变化，即养分有效性高时，植被应变得更“落叶”而更少“常绿”。
