长江三峡库区消落带中山杉耐淹试验

Flooding tolerance of Taxodium hybrid 'Zhongshanshan' along the hydro-fluctuation belt of the Three Gorges Reservoir

于2014年3月,通过对长江三峡库区消落带中山杉的保存率与生长状况进行调查,研究中山杉的耐淹性。结果表明：1）中山杉在163-174 m高程范围内的平均保存率为98.1%,消落带坡度对水淹后中山杉的保存率具有显著影响,消落带原土地利用类型对其保存率影响不显著;2）中山杉在各高程上的平均树高均超过3.5 m,平均胸径均超过4 cm,水淹深度对中山杉的高生长没有显著影响,对其胸径生长有显著影响;3）消落带坡度对中山杉树高和胸径生长存在显著影响,但消落带原土地利用类型对其树高和胸径生长没有显著影响。中山杉极强的耐淹性为生物治理长江三峡库区消落带奠定了基础。

In order to understand the flooding tolerance of Taxodium hybrid ‘Zhongshanshan ＇,we investigated the preserving rate and growth situation of this species in March 2014. The results showed that the average preserving rate of T. hybrid ‘Zhongshanshan＇at the 163-174 m elevation was 98. 1%,the slope gradient of the hydro-fluctuation belt had a significant effect on the preserving rate,while the original land use type in the hydro-fluctuation belt had no significant effects on the preserving rate. Its average height of trees exceeded 3. 5 m,average diameter at breast height（ DBH） was larger than 4 cm;the depth of water had no significant effects on the height of trees,but had significant effects on DBH.The gradient of the hydro-fluctuation belt had significant effects on the height of trees and DBH,but the original land use type in the hydro-fluctuation belt had no significant effects on the height of trees and DBH. The strong flooding tolerance of T. hybrid ‘Zhongshanshan＇lays a solid foundation for improving the Three Gorges Reservoir area in the Yangtze River by biological measures.