Study on the decline and optimized model of agriculture protective forest ecosystem in the Jingtai electrical irrigation area

Agriculture protective forest is an important part of the protective forest system in the Jingtai electrical irrigation area. In order to provide technology support for renewal and reform of agriculture protective forest, the optimized model was proposed according to the analysis of present situation and degradation reasons. The result showed the agriculture protective forest predominated by Populus seriously declined, especially in terms of personal management areas which were incomplete or totally disappeared. The main reasons for these declines included the pests and diseases damage, cutting down because of serious water consumption and soil threat, poor growth and death because of serious farmland secondary salinization, single tree species and unreasonable structure, insufficient management. The renewal and reform of agriculture protective forest was necessary and feasible through employed excellent species, such as Populus tomentosa, P. langfangensis, Pinus sylvestris, Robinia pseucdoacacia, Fraxinus chinensis，Jujube minshan with rotation with dominant species of Populus and optimal modification of evergreen needle tree species. These optimization will have important influences on the improvement of the protective forest ecosystem and guarantee safety of Jintai oasis