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• 研究报告 • 上一篇    下一篇

梭梭个体形态调整在环境定居中的适应

田媛1,2,3,塔西甫拉提·特依拜1,4**,李彦2,3,徐贵青2,3   

  1. (1新疆大学资源与环境科学学院, 乌鲁木齐 830046; 2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试验室, 乌鲁木齐 830011; 3中国科学院阜康荒漠生态系统研究站, 新疆阜康 831500; 4新疆大学绿洲生态教育部重点实验室, 乌鲁木齐 830046)
  • 出版日期:2014-05-10 发布日期:2014-05-10

Effects of morphological adjustment on establishment of Haloxylon ammodendron.

TIAN Yuan1,2,3, TASHPOLAT Tiyip1,4**, LI Yan2,3, XU Gui-qing2,3   

  1. (1College of Resources and Environmental Science, Xinjiang University, Urumqi 830046, China; 2State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China; 3Fukang Station of Desert Ecology, Chinese Academy of Sciences, Fukang 831500, Xinjiang, China; 4Key Laboratory of Oasis Ecology, Xinjiang University, Urumqi 830046, China)
  • Online:2014-05-10 Published:2014-05-10

摘要: 近几十年来,全球气候变化以及人类活动的加剧导致古尔班通古特南缘荒漠地区的降水与地下水位发生显著改变,这些改变必然导致荒漠植物用水策略的适应性变化。本实验以古尔班通古特沙漠南缘原始沙漠中建群种梭梭(Haloxylon ammodendron)为研究对象,从种子萌发起,对气象因子、梭梭地上高度、地下根系深度、生物量等进行了连续监测,直至梭梭完成定居,以期探明梭梭定居过程中的个体形态调整特征。结果表明:在遭遇干旱时,梭梭以同化枝凋落的形态调节方式有效地维持了根系供水与地上部分需水之间的平衡,保证了存活同化器官的光合能力;同时,梭梭以牺牲地上部分生长为代价将更多的光合产物转向根系,使得根系能够获得更多的水分保证其生长、生存。

关键词: 水稻, 镉污染, 稻米镉含量, 碱性肥料

Abstract:

Due to climate change and heavy human activities, the precipitation and groundwater at the southern edge of the Gurbantunggut desert have significantly changed, which would affect the water use strategy of local plants. In this study, Haloxylon ammodendron, which is the constructive species in the southern edge of the Gurbantunggut desert, was taken as the study object. A consecutive investigation on seed germination, meteorological factors, aboveground height, belowground depth and plant biomass was carried out until the establishment of plant, to reveal its growth traits and adaptability during the whole establishment process. The results showed that diebacks of the assimilating branches in drought period could maintain the balance between water supply of roots and water consumption of the assimilating organs. This morphological adjustment ensured the photosynthetic ability of survival organs. Furthermore, the allocation of more photosynthates toward roots could ensure H. ammodendron survival during drought and recovering when water conditions become better.
 

Key words: Cd pollution, rice, alkaline fertilizer, Cd concentration of rice