江苏泥质海岸主要造林树种树干密度变异规律

Study on the Stem Density Variation of Main Plantation Tree Species in the Muddy Sea-coast in Jiangsu

以生长在两种林分经营模式下的沿海防护林树种为研究对象,利用材积密度法对杨树、水杉的树干密度进行研究。结果表明:树干密度基部比顶端大,并随着垂直段位的增高而减少;树干密度随着年龄的增大而增加,幼龄增加迅速,成熟龄后增加趋势减缓;水杉(16年)的树干密度大于杨树(16年),树干均匀性也明显好于杨树。

The stem density of two coastwise shelterbelt tree species （ Populus sp. and Metasequoia glyptostroboides） planted in the two different management models in Jiangsu was studied by the volume-density method in this paper. The results showed that the stem density in the tree base was greater than that in the top for each species, and was decreased with the increase of tree height. The stem density was increased with the tree ages, and rapidly in the young age and slowly down in the mature age. The stem density of the M. glyptostroboides （ 16 a） was greater than that of Poplus sp. （ 16 a） and the stem uniformity of the former was also better than the latter.