英语语法分析

For both beef and dairy production,it requires, at least in the beginning, more pastureland.

对于牛肉和奶制品的生产，至少在开始阶段，需要更多的牧场。

Increase in pastureland and subsequent overgrazing have resulted in an expansion of savanna.

草场的增加和随之而来的过度放牧导致了稀树草原的扩张。

On certain sites, particularly in South America, savanna formation seems related to frequent cutting and burning of moist forests for pastureland.

在某些地方，特别是在南美洲，稀树草原的形成似乎与频繁地砍伐和焚烧潮湿的森林作为牧场有关。