Comprehensive Benefits of the Compound Agricultural and Forest Ecosystem in Raoyang Experimental Area in Huang-Huai-Hai Plan

Raoyang Experimental Area in Huang-Huai-Hai Plain,Which used to be a low production area,is under one of the national key scientific and technological projects,now it is changed into a area with good eco-environment,high production and high forest coverage by comprehensive management.The construction of the compound agricultural and forest ecosystem changed the local ecological condition,meteorological factors,content of CO₂,dust content in air and bird numbers.Forest coverage was increased from 2% to 20%,crop yield was increased from 1.5t/ha to 7.5/ha.Remarkable ecological and economic benefits have been achieved.