则草

在实施过程中，立足现实，因地制宜，采用宜林则林、宜草则草的原则，取得了较好的经济、社会和生态效益。

It has got better economic , social , ecological benefit .

松散堆积土种草的水土流失则主要发生在草还未完全覆盖地表前的3个月，该期土壤流失量占其全年的99%以上；而草覆盖地表后，土壤流失则极为轻微。

As for the loosely-piled soil with seeding treatment , 99 % of the annual erosion occurred during the period before grasses fully-covered the land , that is , 3 months after seeding .