Changjiang County is located to the northwest of the tailing range of the Wuzhi Mountains on Hainan Island, facing the sea and being against the Mountains. From southeast to northwest, it gradually descends in relief ...Changjiang County is located to the northwest of the tailing range of the Wuzhi Mountains on Hainan Island, facing the sea and being against the Mountains. From southeast to northwest, it gradually descends in relief from mountain, hill, tableland, terrace to coastal plain. Its sandy coastal line is measured at 44.85 km in length and its rocky coastal line at 7.15 km along the county. The desertified coastal land covers an area of about 61.15 km2, ex tending from hundreds of meters to 3 km in width, of which the active sand land accounts for 5. 333 km2 and the semi-active sand land, 7. 333 km2. The dunes are developed at the rate of 10 - 30 m per year from the seashore toward the hinterland.The Forest Departments of Hainan Province and Changjiang County have done a series of sand-control experiments. The chief technological measures are as follows: (1) to stabilize the drift sand first to create an adequate condition for afforestation; (2) to plant the big and strong saplings of Casuarin equisetifolia with nutrient bags in deep pits; and (3) to apply new tech niques in 'dry-season planting' to guarantee the quality of afforestation. The above experi ments were successful. However, there still exist some problems such as quite seriously wilting shoot, lower survival rate of Pandanus tectorius in the vertical lines to the usual wind direc tion, monotonous tree species in afforestation and subsequent poor management. Thus some suggestions are offered in this paper for future extension: ( 1 ) to apply REE fertilizers in the process of afforestation to increase the resistance of the plants; (2) to increase the vertical lines of Pandanus tectorius to the usual wind direction to raise their survival rate in the network of sand stabilization; (3) to enlarge the area of liana planting to enhance the stability of sand; (4)to try to introduce new tree species from other regions, which are of good performance in sand stabilization; (5) to interplant the adaptable economic crops; and (6) to make more invest ments and better management and conduct more extensive environmental education to ensure the early accomplishment of the protection forest belt around the island.展开更多
基金国家自然科学基金，Hainan Natural Science Foundation，Hainan Provincial Bureau of Education
文摘Changjiang County is located to the northwest of the tailing range of the Wuzhi Mountains on Hainan Island, facing the sea and being against the Mountains. From southeast to northwest, it gradually descends in relief from mountain, hill, tableland, terrace to coastal plain. Its sandy coastal line is measured at 44.85 km in length and its rocky coastal line at 7.15 km along the county. The desertified coastal land covers an area of about 61.15 km2, ex tending from hundreds of meters to 3 km in width, of which the active sand land accounts for 5. 333 km2 and the semi-active sand land, 7. 333 km2. The dunes are developed at the rate of 10 - 30 m per year from the seashore toward the hinterland.The Forest Departments of Hainan Province and Changjiang County have done a series of sand-control experiments. The chief technological measures are as follows: (1) to stabilize the drift sand first to create an adequate condition for afforestation; (2) to plant the big and strong saplings of Casuarin equisetifolia with nutrient bags in deep pits; and (3) to apply new tech niques in 'dry-season planting' to guarantee the quality of afforestation. The above experi ments were successful. However, there still exist some problems such as quite seriously wilting shoot, lower survival rate of Pandanus tectorius in the vertical lines to the usual wind direc tion, monotonous tree species in afforestation and subsequent poor management. Thus some suggestions are offered in this paper for future extension: ( 1 ) to apply REE fertilizers in the process of afforestation to increase the resistance of the plants; (2) to increase the vertical lines of Pandanus tectorius to the usual wind direction to raise their survival rate in the network of sand stabilization; (3) to enlarge the area of liana planting to enhance the stability of sand; (4)to try to introduce new tree species from other regions, which are of good performance in sand stabilization; (5) to interplant the adaptable economic crops; and (6) to make more invest ments and better management and conduct more extensive environmental education to ensure the early accomplishment of the protection forest belt around the island.
