秦巴山地生态恶化贫困区历史成因分析

１８—１９世纪前期流民的大规模移入引发了秦巴山地的全面开发，而落后的、掠夺性的农业垦殖方式及其对森林资源的破坏，导致了生态环境的全面恶化，水土流失逐渐加重，水旱灾害频繁．由于生态环境恶化，农耕面积显著减缩，单产下降，人口大量外流，经济普遍衰退，人民生活愈益走向贫困．

AN ANALYSIS ON THE HISTORICAL CONTRIBUTION FACTOR OF ECOSYSTEM DETERIORATION IN THE QINGLING-DABA MOUNTAINOUS REGION

During the 18th to ther early of 19th,ther was a great deal of exploitation in the QinglingDaba mountainous region, because a lot of immigrantes entered this area. Backward and predatory farming methds and destruction of the forest resourses caused the ecological environment deterioration drastlcally;soil erosion got more and more serious,and floods occurred repeatedly.Owing to all these facts,cultivated land decreasd remarkably and per unit area yield came to less and local economy declined universally.so many residents had to emigrate from here.the people who stayed here became more poverty-stricken than ever.