Around 10-15 years ago I saw a Ted Talk on this topic, which was very convincing.
The basic idea was that by not grazing, the dead tall grass was left standing and it dried out and oxidized. This prevented new grass from growing, and the dead roots from the old dead grass, which was still standing, could not effectively hold the soil and prevent erosion from rainfall.
His before and after photo was very convincing. After using sheep to not only trample the old dead grass but to also fertilize the grassland, the land looked lush and productive.
Around 10-15 years ago I saw a Ted Talk on this topic, which was very convincing.
The basic idea was that by not grazing, the dead tall grass was left standing and it dried out and oxidized. This prevented new grass from growing, and the dead roots from the old dead grass, which was still standing, could not effectively hold the soil and prevent erosion from rainfall.
His before and after photo was very convincing. After using sheep to not only trample the old dead grass but to also fertilize the grassland, the land looked lush and productive.
How to green the world's deserts and reverse climate change | Allan Savory 5.5M views 9 years ago:
https://www.youtube.com/watch?v=vpTHi7O66pI