School of Forestry and Wildlife Sciences, Auburn University, Auburn, AL 36849, USA.
Environ Pollut. 2012 Apr;163:281-6. doi: 10.1016/j.envpol.2012.01.003. Epub 2012 Jan 30.
A mixture of common Southern Piedmont (USA) grassland species (Lolium arundinacea, Paspalum dilatatum, Cynodon dactylon and Trifolium repens) was exposed to O(3) [ambient (non-filtered; NF) and twice-ambient (2X) concentrations] and fed to individually caged New Zealand white rabbits (Oryctolagus cuniculus) in a digestibility experiment. Forages and feed refusals were analyzed for concentrations of total cell wall constituents, lignin, crude protein, and soluble and hydrolyzable phenolic fractions. Neutral detergent fiber and acid detergent fiber digestibility by rabbits were significantly lower for 2X than NF forage. Decreased digestibility could not be attributed to lignin concentrations, but was associated with increased concentrations of acid-hydrolyzable and saponifiable phenolics. Exposure of forage to elevated O(3) resulted in decreased digestible dry matter intake by rabbits. Elevated O(3) concentrations could be expected to have a negative impact on forage quality, resulting in decreased nutrient utilization by mammalian herbivores in Southern Piedmont grasslands under projected future climate scenarios.
将常见的美国南皮德蒙特（Southern Piedmont）草原物种（梯牧草、钝叶草、假俭草和白车轴草）混合物暴露于 O3[环境（未过滤；NF）和两倍环境（2X）浓度]下，并在消化实验中用其喂养单独笼养的新西兰白兔（Oryctolagus cuniculus）。分析饲料和饲料拒食物中的总细胞壁成分、木质素、粗蛋白以及可溶性和可水解酚类物质的浓度。对于 2X 比 NF 饲料，兔对中性洗涤剂纤维和酸性洗涤剂纤维的消化率明显降低。消化率降低不能归因于木质素浓度，而是与酸可水解和可皂化酚类物质浓度增加有关。牧草暴露于升高的 O3 会导致兔可消化干物质摄入量减少。预计未来气候情景下，升高的 O3 浓度可能会对南方皮德蒙特草原的牧草质量产生负面影响，导致食草哺乳动物的营养利用率降低。
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