关键词: 昌江县, 滨海, 土地风沙化, 环境整治, 海南

Abstract: Changjiang county is located to the northwest of the tailing range of Wuzhi Mountains in the Hainan Island.It faces the sea and is backed by the Mountains.From southeast to northwest,the relief is gradually descends from Mountains,hill,tableland,terrace to coastal plain.There are 44.85 km long sandy and 7.15 km rocky coast in 52 km long coastline in the county.The desertification coastal land is about 61.15 km² in size and from hundreds meters to 3 km in width,in which the active sand land accounts for 5.333 km² and semi active sand land 7.333 km².The dunes move at 10~30 m from the seashore to hinterland annually.The forest sectors of Hainan Province and Changjiang countuy have done a series of sand control experiments.The chief technological measures are as following:(1) Stabilize the drift sand firstly to create the adequate condition for afforestation.(2) Plant the big and strong sapling of Casuarin equisetifolia with nutrient bag in deep pit.(3) Apply the new technique of "planting in dry season" to guarantee the quality of afforestation.The above experiments are successful.However there still exists some problems such as quite serious wilting shoot,lower survival rate of Pandanus tectorius in the vertical lines to the usual wind direction,monotonous tree species in the afforestation and poor management in later stage.Thus the suggestions are offered in this paper for future extension:(1) Apply the fertilizer of rare earth elements in the process of afforestation to increase the resistance of the plants.(2) Add the vertical lines of Pandanus tectorius to the usual wind direction to raise the survival rate of them in the network of sand stabilization.(3) Enlarge the area of liana planting to enhance the stability of sand.(4) Try to induce the tree species from the other regions,which have good performance in sand stabilization.(5) Interplant the adaptable economic crops to provide support of afforestation with economic benefits.(6) Make more investments,better management and more extensive environmental education to ensure the connection of the protection forest belt around the island earlier.

Key words: Changjiang county, coast, desertification, environmental management, Hainan Province