落羽杉与池杉幼苗对多种胁迫环境的响应及其对三峡库区库岸防护林营建的启示

落羽杉与池杉适应和耐受水淹环境已被广泛认可,然而干旱、盐碱、污染与病虫害将很容易影响3年生以下幼苗的生长与发育.在三峡库区库岸带多种胁迫环境条件下,选择3年生或者更大更健壮的落羽杉与池杉营造库岸林较为理想.3年生或者更大更健壮的落羽杉与池杉与年龄偏小的幼苗相比抵抗多种逆境胁迫的能力会更强.在三峡库区盐碱地环境条件下,选择落羽杉与墨西哥落羽杉杂交种中山杉302,以及池杉与墨西哥落羽杉杂交种中山杉401作为造林树种较为适宜.总体来讲,落羽杉与池杉是三峡库区库岸造林的优良候选树种.然而,大量开展落羽杉与池杉对深淹胁迫、多种胁迫因子叠加条件下的生理生态响应研究仍然是必需的.

Responses of Baldcypress and Pondcypress Seedlings to Multiple Stresses and Reforestation Implications for Riparian Zones of the Three Gorges Reservoir Region of China

Baldcypress (Taxodium distichum ) and pondcypress (T. Ascendens ) seedlings less than 3-year-old are susceptible to multiple stresses such as drought, salinity, alkalinity, pollution and diseases, although the two species are widely recognized adaptable and/or tolerant to flooding. However, 3-year-old or older, or stronger baldcypress and pondcypress saplings may perform better than the younger ones when subjected to multiple stresses, and thus could be selected for reforestation. The hybrids of Taxodium "zhongshansa 302" and T. "zhongshansa 401" could be used for reforestation under high salinity and alkalinity environments. In general, baldcypress and pondcypress are promising candidates for reforestation in riparian zones of the Three Gorges Reservoir region. However, more researches, such as responses of baldcypress and pondcypress to deep submergence and two or more stresses combination, still needs to be done.