Menchaca L, Hornung M
Institute of Terrestrial Ecology (NERC), Bangor Research Station, Gwynedd, LL57 2LQ, UK.
Merlewood Research Station, Cumbria LA11 6JU, UK.
New Phytol. 1989 Mar;111(3):483-489. doi: 10.1111/j.1469-8137.1989.tb00711.x.
Pure stands of Trifolium repens L. N.Z. Huia and Lolium perenne L. S32 and mixtures of various densities and frequencies were treated with sulphuric acd solutions of p 2.5, 3.5 and 5.6. The species yield was recorded over five sequential harvests. Multifactorial response equations were used to describe the behaviour of the species yield as a function of acidity and the density of both species. Predictions, made through these models, showed that the response of yield of these species to simulated acid rain treatments Varied greatly depending on the planting density, the time of harvesting and on whether the plants were growing in monoculture or in mixture. This suggests that it is not sufficient to consider the effects of experimentally applied acid rain on single individuals or low density stands, since the results obtained will not reflect the response in a close canopy sward.
对白三叶新西兰胡亚品种、多年生黑麦草S32品种的纯植群落以及不同密度和频率的混合群落，用pH值为2.5、3.5和5.6的硫酸溶液进行处理。在连续五次收获过程中记录物种产量。采用多因素响应方程来描述物种产量随酸度和两个物种密度变化的行为。通过这些模型所做的预测表明，这些物种产量对模拟酸雨处理的响应因种植密度、收获时间以及植物是单作还是混作而有很大差异。这表明，仅考虑实验施加的酸雨对单株植物或低密度群落的影响是不够的，因为所获得的结果无法反映郁闭度高的草皮的响应情况。
