| The ecological effects of the dry-land ecological engineering model “Paulownia-maize-wheat-cotton” used in hilly area of central Hubei Province were studied.The results show that,compared with the traditional cultural model of “wheat-sesame”,this model can remarkably improve both the micro-climate of wind and the soil water conditions of the field,reduce the wind velocity 27.7%～45.6%,and increase the soil water content 2.10% averagely in the serious drought season.In addition,this model can increase the organisms growth time and the accumulate temperature(≥10℃) by 132%～141% and 139.80%～148.90% yearly,respectively.It provides an efficient engineering model for improving ecosystem conditions of large dry-land fields in hilly areas in China. |