根茎禾草假苇拂子茅拓殖流动沙丘的过程和调控机制

根茎禾草拓殖流动沙丘的时空格局和拓殖速率，根茎禾草拓殖沙丘的驱动力及调控机制，以及根茎禾草在沙丘植被恢复中的地位和作用是克隆植物进化适应途径认知和沙区植被恢复实践需求的重要理论和实践问题。但现有研究尚不能充分回答上述问题。假苇拂子茅（Calamagrostis pseudophragmites）是乌兰布和沙漠优势根茎型禾草，生长在丘间低地并拓殖到流动沙丘。鉴于此，本项目以假苇拂子茅为研究对象，通过野外调查、野外定位监测、控制实验、同位素示踪和分子生物技术分析方法，研究其拓殖流动沙丘的时空格局、速率及调控机制，评估其在沙丘植被恢复中的地位和作用，以增强人们对克隆植物适应和进化过程的认识，丰富异质性生境下根茎禾草空间拓展理论，为固沙实践提供科学依据。

To explore the spatio-temporal pattern, colonizing rate, driving forces, regulative mechanism as well as its role in sand dune revegetation of rhizomatous grasses colonizing active sand dune, is of theoretical and practical importance to know not only the evolutionary adaptions of clonal plants, but also the implementation of sand dune revegetation. However the existing research has not yet fully answered the above questions. Calamagrostis pseudophragmites, a dominant rhizomatous grass in the Ulanbuh Desert, distributed in the interdune lowland, can colonize active sand dunes effectively. Therefore, in this project, C. pseudophragmites is selected to study the spatio-temporal pattern, rate and regulative mechanism of its colonization on the active sand dune by using field investigation, field monitoring, controlled experiment, isotope tracer method and molecular biotechnology. The objectives are to evaluate its position and function in the restoration of sand dune, to enhance the understanding on adaptation and evolution of clonal plants, to enrich the spatial expansion theory of rhizomatous grass in the heterogeneous habitat, and to provide a scientific basis for sand-fixing practice.