中文摘要：

理解牧草数量和质量的模式并且调查影响这些模式的因素为畜牧的发展是必要的。然而，有很小的地证据，在大空间规模集中于这些问题。在当前的学习，我们在越过中国在所有主要草地类型散布的 177 个地点分析了牧草数量和质量，并且基于一致采样协议探索了在牧草数量和质量之间的关系。我们也调查了越过中国影响牧草质量模式的潜在的因素。我们的学习显示西藏的草地有更高的数量和质量因为高生产率和粗略的蛋白质和氮释放的草地，牧草比内部蒙古的草地，和高山的草地让最好的数量和优秀牧草提取草地牧草的内容。为主要植被形成， Kobresia tibetica 草地和 Achnatherum splendens 大草原有最高的数量，当时小而淡的草地有的 Kobresia pygmaea 草地和 Kobresia 最好的质量。我们也发现尽管环境因素例如温度和土壤富饶，能影响生理的过程那么影响牧草质量，变化的大规模模式主要是在植被类型的差别的结果。最后，我们报导了在牧草数量和质量之间的一种否定关系：更高的牧草数量意味着更多的粗略的纤维但是更少的醚摘录和粗略的蛋白质。这些调查结果在牧草数量和质量的空间模式上改进我们的理解，并且提供与畜牧的未来发展有关的稳固的证据。

英文摘要：

Understanding the patterns of forage quantity and quality and investigating the factors influencing these patterns are essential for the development of animal husbandry. However, there is very little field evidence focused on these issues at a large spatial scale. In the current study, we analyzed forage quantity and quality at 177 sites distributed in all the major grassland types across China, and explored the relationship between forage quantity and quality based on consistent sampling protocols. We also investigated potential factors influencing forage quality patterns across China. Our study indicates the Tibetan grasslands had both higher quantity and quality forage than the Inner Mongolian grasslands, and alpine meadow had the best quantity and quality forage be- cause of the meadow＇s high productivity and the crude protein and nitrogen free extract content of the meadow forage. For the main vegetation formations, Kobresia tibetica meadows and Achnatherum splendens steppes had the highest quantity, while Kobresia pygmaea meadows and Kobresia humilis meadows had the best quality. We also found that although environmental factors, such as temperature and soil fertility, could affect physiological processes and so influence forage quality, the large scale patterns of change were mainly a result of the differences in vegetation types. Finally, we reported a negative relationship between forage quantity and quality： higher forage quantity means more crude fiber but less ether extract and crude protein. These findings improve our understanding on the spatial patterns of forage quantity and quality, and provide solid evidence related to the future development of animal husbandry.