繁殖体与微生境在退化草地恢复中的作用

退化草地的成功恢复主要依赖于种子和母株无性繁殖幼苗的有效建植 ,即草地群落中可利用繁殖体是退化草地得以恢复的内在条件。此外 ,群落中那些提供种子发芽、幼苗生长发育的适宜微生境 (safe sites/ suitable microsites) ,构成了退化草地恢复的外在条件。由于严重退化草地群落缺乏可利用繁殖体和供繁殖体生长发育的适宜微生境 ,使得退化草地恢复受到很大限制 ,因而 ,同时满足繁殖体与微生境是退化草地恢复的先决条件。人为提供繁殖体和适宜微生境可以在很大程度上提高退化草地的恢复速度 ,即在缺乏繁殖体草地群落供给繁殖体 ,或者在缺乏微生境的草地群落中创造适宜微生境。不同植物种群建植需要的环境存在着显著差异 ,因此在人工恢复草地群落过程中 ,对这些植物的繁殖体和繁殖体着床环境给予特殊处理是必需的 ,使之同时满足多种植物种群建植需求。对退化草地植物繁殖体、微生境的重要性及其涵义进行讨论

The role of diaspores and microsites in restoring degraded grasslands

Successful restoration of degraded grassland is mainly dependent upon the efficient establishment of seedlings both from available seeds and parental clones, i.e. available diaspores in grassland communities are the intrinsic requirements for the restoration of degraded grassland. Further more, safe sites in the communities that provide seeds, seedlings and even adult individuals with suitable resources, such as nutrients, water, light etc., for their normal germination, growth and development, constitute the extrinsic condition for the restoration of degraded grassland. The lack of available diaspores and safe sites in degraded grassland communities has limited the process of degraded grassland restoration, to meet the requirement for both available diaspores and safe sites simultaneously is the prerequisite for the restoration of degraded grassland. Artificial preparation of both available diaspores and safe sites in grassland communities could increase the speed of the restoration, i.e. additional diaspores should be provided in the communities that limited by diaspores limitation during natural restoration, and/or created safe sites for the additional diaspores. Different requirements of various plant species for efficient establishment in the process of restoration need specific treatment both in diaspores and habitats. The precent study aims at discuss the importance of diaspores and microsites and their implications in the restoration of degraded grasslands.