Abstract: Studies on the effect of farmland windbreak on preventing rice lodging and yield reduction under violent tropical storm in coastal regions of Jiangsu show that the percentage of rice lodging on the farmland with and without windbreaks is respectively 16.28% and 49.73%.If rice lodging is happened at the mildy stage,the thousand grains weight and the yield will be decreased by 13.24% and 14.32%,respectively.The yield reduction rate by rice lodging on the farmland with windbreaks is one third of that on the farmland without windbreaks.When the percentage of keeped trees of main windbreak is more than 90%,the resistance to rice lodging is the maximum,and the yield reduction rate from it is the minimum.

Key words: Farmland windbreak, Violent tropical storm, Rice, Resistance to lodging, Pinus massoniana plantation., edge effect, recalcitrant component, forest gap