Therefore, the thorough research about the influences of cropcover on erosion is important to control erosion economically and effectively, as well as to improve soil erosion theory.
因此，深入研究作物植被对土壤侵蚀的作用，对经济有效地防治侵蚀、完善土壤侵蚀理论有重要的意义。
2
Resembling a work of modern art, variegated green crop circles cover what was once shortgrass prairie in south-western Kansas.