厚荚相思在沿海沙质海岸更新造林中的应用

为改变沿海地区造林树种单一状况，提高森林群落稳定性和生物多样性，1990年在福建东山县海岸后沿沙地引种厚荚相思、马占相思、大叶相思、肯氏相思、纹荚相思及毛绢相思；1998年选用厚荚相思、木麻黄、刚果12＃桉、湿地松等树种在木麻黄基干林带下套种更新和带状采伐更新；1999年选用厚荚相思、肯氏相思、马占相思、纹荚相思在风口沙地造林。研究结果表明，在海岸前沿风口沙地厚荚相思造林成活率高，受风害轻微，对沙荒风口不良生境适应力强；在海岸木麻黄基干林带更新中，厚荚相思保存率高，生长迅速；在林带后沿沙地厚荚相思成活率和保存率高于其它相思类树种，树高，直径及材积生长量最大，降低风速明显，林内凋落物多，提高土壤肥力显著。

Application of Regeneration and Forestation of Acacia crasscarpa on the Sandy Land in the Coastal Zone

In order to change the single situation of forestation tree species on the coastal areas and improve the steadiness of forestry groups and varieties of biota. Acacia crassicarpa,A.mangium,A.auriculaeformis,A.cunninghamii,A.aulacocarpa and A.holosericea were introduced in 1990. A.cunninghamii,Casuarina equisetifolia,Eccalyaptus 12ABL, Pinus elliottii etc.were interplanted or belted cutting regeneration in the trunk shelterbelt of Casuarina equisetifolia in 1998 .A.crassicarpa,A.auriculaeformis,A.mangium,A.aulacocarpa were chosen for forestation on the sandy land in the draught in 1999. The results indicate that the survival percentage of A.crassicarpa is the highest and the wind damage rate is the slightest on the sandy land in the draught,the adaptable ability of A.crassicarpa is stronger than others to the bad environment on the sandy land in the draught; The preserving rate of A.crassicarpa is higher and the growth is quicker in the regeneration of the coast trunk shelterbelt of Casuarina equisetifolia ;The survival percentage and preserving rate of A.crassicarpa are higher than other Acacia species on the behind sandy land of the shelterbelt, the height and diameter of A.crassicarpa are the largest as well as volume, this tree specie lowers wind speed obviously, the litterfall is more inside forest, the soil fertilization is improved apparently.