Development of a handy seed-harvester of useful wild grasses for re-vegetation.

由于商品牧草种子入侵物种的问题，利用乡土牧草作为饲料作物或恢复植被是非常重要的。逸出的牧草入侵了各种生态系统，对生物多样性产生了负面影响。然后，许多生态学家建议在人工草地上使用原生草。但是，利用乡土牧草也存在着种子采收难、种子贮藏难等问题。日本乡土牧草种子小，有乳突，收割难度大。我们不能用普通的种子收割机收割乡土牧草。而且，由于在一个群体中存在较多的遗传变异，很难将所有的乡土牧草种子调整到人工条件下。因此，我们尝试开发适合乡土牧草的种子收割机，通过更换发动机除草器来开发种子收割机。种子在高倍率下采集粗糙，种子萌发存在一定的问题。通过种子繁殖利用乡土牧草必须解决这个问题。乡土牧草种子在室内条件下不能长时间保存。这对于重新恢复植被是一个很大的问题。我们发现空气中的水分降低了白玉兰种子的寿命。使用干燥剂可以使种子保持活力两年以上。

It is very important to use native grass for fodder crop or re-vegetation because of problems of invading species of commercial based seeds of pasture grass. Escaped pasture grass had been invaded to various ecosystems and they negatively changed bio-diversity. Then, many ecologists recommend use of native grass for artificial grassland. But, there are some problems for using native grass such as difficulty of seed harvest and difficulty of seed storage. Seed harvest of Japanese native grass is very difficult because of small seed with pappus. We can not use common seed-harvester for native grass. And, it is very difficult to adjust the all seed of native grass to artificial condition because there are many genetic variations in only one population. So, we tried to exploit seed harvester for native grass.We exploited the seed-harvester by change of engine weed cutter. There are some problems for seed germination because of rough collecting at high power. We must solve this problem for using native grass by seed propagation.Seeds of native grass can't maintain for long time in room condition. It is a large problem for re-vegetation. We found air moisture decrease longevity of seed in Imperata cylindrica. It is possible to maintain vigor of seeds for over two years by using desiccant.