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

由于牧草商业种子的入侵问题，利用本地牧草作为饲料作物或恢复植被非常重要。逃逸的牧草已经侵入到各种生态系统中，对生物多样性产生了负面影响。然后，许多生态学家建议使用天然草作为人工草地。但是，利用天然牧草存在种子收获困难、种子贮藏困难等问题。日本原生草种子收获非常困难，因为带有冠毛的种子很小。不能用普通的采种机采种。而且，由于一个群体中存在着许多遗传变异，因此很难将所有的天然牧草种子调整到人工条件下。为此，我们尝试开发了一种适合本地牧草的种子收获机，通过更换发动机除草器，研制出了一种适合本地牧草的种子收获机。由于大功率采集的粗糙性，给种子的发芽带来了一定的问题。利用乡土牧草种子繁殖必须解决这一问题，乡土牧草种子在室内条件下不能长期保存。这是一个很大的问题，重新植被。结果表明，空气湿度降低了白茅种子的寿命。使用干燥剂可使种子活力保持两年以上。

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.