Detling J K, Dyer M I, Procter-Gregg C, Winn D T
Natural Resource Ecology Laboratory, Colorado State University, 80523, Fort Collins, CO, USA.
Oecologia. 1980 Apr;45(1):26-31. doi: 10.1007/BF00346702.
Laboratory experiments were performed to determine whether regrowth of blue grama was affected by potential growth-promoting substances in saliva of North American bison. We observed no statistically significant effects of foliar application of whole bison saliva on net photosynthesis (P), root respiration (R), allocation patterns of photosynthetically fixed C, or regrowth rates over a 10-day period following clipping to various heights. In a 10-week experiment, there were no significant effects of saliva on leaf, crown or root growth or tiller production in plants clipped to heights of 6, 4 or 2 cm above crowns. Similarly, nitrogen-stressed plants failed to show significant changes in growth rates or tillering in response to saliva over a 3-week period. Clipped blue grama plants did exhibit significant compensatory growth responses, including higher P rates from 3-10 days following clipping and allocation of a higher proportion of current photosynthate to synthesis of new leaf tissue with increasing severity of defoliation. Nevertheless, unclipped plants invariably outproduced clipped plants following defoliation.
进行了实验室实验，以确定北美野牛唾液中潜在的生长促进物质是否会影响格兰马草的再生长。我们观察到，在将格兰马草修剪至不同高度后的10天内，叶面喷施全野牛唾液对净光合作用（P）、根系呼吸（R）、光合固定碳的分配模式或再生长速率均无统计学上的显著影响。在一项为期10周的实验中，对于修剪至高于冠部6厘米、4厘米或2厘米高度的植株，唾液对其叶片、冠部或根系生长以及分蘖产生均无显著影响。同样，在为期3周的时间里，氮胁迫植株对唾液处理也未表现出生长速率或分蘖方面的显著变化。修剪后的格兰马草植株确实表现出显著的补偿性生长反应，包括修剪后3至10天内较高的光合速率，以及随着落叶程度加重，将更高比例的当前光合产物分配到新叶组织的合成中。然而，落叶后未修剪的植株产量始终高于修剪过的植株。
