Land Degradation Mechanism And Ecological Rehabilitation Techniques In Yellow River Delta (YRD) Region

Based on the project conduction of China Forest Eco-nets System Research and former work foundations, the topic of land degradation mechanism and ecological rehabilitation techniques in Yellow River Delta (YRD) region was chosen as the postdoctoral report.Land degradation was defined that land quality and productivity decline due to adverse natural factors in addition to irrational land use. Thus land degradation behaved that land bio-product reduction, potential production decrease, land resources lose and production conditions worsening. It referred with soil erosion, desertification, salinization, leanness, acidification, swamp and pollution, etc. In another word, it could be concluded that soil physical degradation, chemical degradation and biological degradation. In this report the problems concerned with land degradation such as desertification, soil & water erosion, salinization, mine abandon land, soil & water erosion in dry valley area, road construction were discussed.According to statistics, there was 2.0 × 10~9 km~2 degraded land on the earth, while soil & water erosion area was 2.642 ×10~7 km~2, which took 28.3% of the whole world farmland. In China there was soil & water erosion area 3.56×10~6 km~2, which took 37.1% of the total land area up to 2002. By 2004, there was desertification area 1.74 ×10~6 km~2 in the country. In view of some relative research results driving factors of land degradation were analyzed as well. Thereby combating measures mainly concerning ecological rehabilitation techniques were put forward.YRD lied at Bohai sea gulf, was one of the three biggest deltas in the country. Total land area covered 12000 km~2, while averagely 0.5hm~2 per capita, arable land was 0.19hm~2 per capita in the region. As well known that the region was alleviated, so that its natural resources were rich. However here rainfall was less, mineral content in...