极端干旱生境下胡杨克隆水分整合特征及其生态意义

被引：7

作者：

朱成刚 ^{[1
]}

李卫红 ^{[1
]}

马建新 ^{[1
]}

周莹莹 ^{[2
]}

机构：

[1] 中国科学院新疆生态与地理研究所荒漠与绿洲生态国家重点实验室

[2] 新疆师范大学地理科学与旅游学院

来源：

植物科学学报 | 2017年 / 35卷 / 03期

关键词：

克隆整合; 稳定同位素示踪; 水力导度; 水势; 光合活性; 干旱生境;

D O I：

暂无

中图分类号：

Q948.1 [植物生态学];

学科分类号：

摘要：

克隆水分整合是克隆植物有效利用异质性生境资源的重要对策,也是在恶劣生境下得以定植、存活的重要生存策略。本研究以塔里木河下游的胡杨(Populus euphratica Oliv.)为对象,结合野外调查、稳定同位素技术、生理生态监测实验,调查胡杨的克隆水分整合特征并分析其生态意义。结果显示,胡杨母株与其克隆幼株间存在显著水分生理整合,水分整合以顶向传输为主,水分整合过程与整合水量受到母株生理节律及母株到幼株间隔子长度的影响;克隆幼株因水分整合而能够获取与母株相似的深层土壤水分,比同一区域实生幼株拥有更好的水分获取能力,并使胡杨克隆幼株比实生幼株保持相对更高的水力导度、叶片水分含量及叶水势;在极端干旱生境下的这种水分获取及利用策略使胡杨克隆幼株比实生幼株具有更高的光化学效率与光合性能,有助于克隆幼株在不利生境下定植、存活并保持更高的生存优势。

引用

页码：344 / 353

页数：10

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