不同立地条件对川黔紫薇生长的影响

Effects of the different site conditions on growth of Lagerstroemia excelsa

为了探索不同立地条件对川黔紫薇生长的影响,选取湖南省森林植物园、湖南城步南洞林场2个试验点研究了川黔紫薇1年生播种苗生长情况;选取湖南省森林植物园、湖南城步南洞林场和城步茅坪3个试验点研究了造林6年的川黔紫薇幼树生长情况。结果表明:(1)2个试验点的川黔紫薇1年生苗株高、地径均有极显著差异,以板页岩发育的黄壤的城步南洞林场试验点的1年生苗平均株高和地径分别为1.65 m、1.16 cm,以四纪网纹层发育的低丘红壤的湖南省森林植物园试验点的1年生苗平均株高和地径分别为1.08 m、0.82 cm。(2)3个造林试验点的6年生川黔紫薇的树高、胸径均有极显著差异,以板页岩发育的黄壤的城步南洞林场试验点的植株生长最快,平均树高和胸径分别为5.8 m和7.94 cm,以石灰岩发育的黄壤的城步茅坪试验点的植株次之,以四纪网纹层发育的低丘红壤的湖南省森林植物园试验点的植株生长最慢。结论认为川黔紫薇能在湖南省低丘至山地较大范围内栽培,但最适范围是海拔500 m左右及以上可造林山地,并且该树种是石漠化治理的优良树种。

In order to explore the influence of different site conditions on the growth of Lagerstroemia excelsa, its growth of one-year-old seedlings were studied in this 2 test points of Hunan Forest Botanical Garden and Hunan Chengbu Nandong Tree Farm, and its growth of treelets with planting for 6 years were studied in this 3 test points of Hunan Forest Botanical Garden and Hunan Chengbu Nandong Tree Farm and Chengbu Maoping. The results showed that： （ 1 ） The height and ground diameter of one-year-old seedlings were significantly different in 2 test points, the height and ground diameter were 1.65 m and 1.16 cm respectively in Chengbu Nandong Tree Farm with yellow soil developed from plate shale, and the height and ground diameter were 1.08 m and 0.82 cm respectively in Hunan Forest Botanical Garden with red soil developed from quaternary reticulate layer. （ 2 ） The height and DBH of treelets with planting for 6 years were significantly different in 3 test points. The average height and DBH grew the fastest in Chengbu Nandong Tree Farm with yellow soil developed from plate shale, which were 5.8 m and 7.94 cm respectively, and took second place in Chengbu Maoping with yellow soil developed from limestone, and was worst in Hunan Forest Botanical Garden with red soil developed from quaternary reticulate layer. Conclusions consider that, Lagerstroemia excelsa can be cultivated in low hill and mountain region to a large range in Hunan, but the optimum range is afforestation mountain with elevation about 500 m and above, and Lagerstroemia excelsa is a fine species of rocky desertification control.