胶南市沿海防护林体系结构优化与树种配置的研究_11_15.pdfVIP

胶南市沿海防护林体系结构与树种配置优化的研究 chinensis and some other tree species which have been testified in other coastal area. The proportion of P. thunbergii is still the largest, about 58.95%, that of T. chinensis and Pinus taeda are reduced comparing to before. Water conservation forests consist of Robinia pseudoacacia and Quercus acutissima mainly, which are accounted for 47.15% and 36.7% respectively. Among the conifer tree species, P. thunbergii hold the largest proportion, 7.57%, while Patycladus orientalis and Pinus densiflora are smaller. On the other hand, mixed arbor and shrub forest should be cultivated in the future to highten water conservation capacity. Soil and water conservation forest consist of R. pseudoacacia, Q. acutissima, P. thunbergii and P. densiflora, account for 55.08%, 27.98%, 10.80% and 6.14% respectively. So there is a balance between conifer and hardwood. In order to put the optimization into practice, the tree species arrangement of the wind shelter and sand fixation forest，water conservation forests and soil and water conservation forest are carried out. When the protective efficiency reaches the maximum, the arrangement pattern of the wind shelter and sand fixation forest are the mixed forest of P. thunbergii and R. pseudoacacia with the ratio of 2:1, the mixed forest of P. thunbergii and new tree species with the ratio of 3:2. While for the pattern of the water conservation forest are the mixed forest of P. thunbergii and R. pseudoacacia with 6:1, the mixed forest of P. thunbergii and Q. acutissima with 5:1, the mixed forest of P. thunbergii and Amorpha fruitcosa. Moreover, for the soil and water conservation forest is the mixed forest of P. thunbergii and R. pseudoacacia with 1:5. The eco-benefit of the wind