Artificial propagation by seeding 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。于是，许多生态学家建议将原生牧草用于人工草地。但是，利用乡土牧草也存在着种子采集困难等问题。日本乡土牧草种子较小，有乳突，采集难度较大。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，我们试图寻找足够的品种来重建植被。此外，我们还尝试开发了乡土牧草种子收割机。我们发现了一些具有遗传分化的白茅属品种。一个品种的种子很大，没有种子休眠。人们认为该品种对恢复植被非常有用。我们通过对手提式排种器进行挖掘机改造，开发出了种子收割机。与人工采种相比，该采种机的采种效率很高。但是，由于高倍率采集粗放，种子萌发存在一些问题。通过种子繁殖利用乡土牧草，必须解决这一问题。

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 to use the native grass for artificial grassland. But, there are some problems for using native grass such as difficulty of seed collection. Seed collection 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 search adequate varieties for re-vegetation. And, we tried to exploit seed harvester for native grass.We found some genetically differentiated varieties of Imperata cylindrical. A variety have large seed with no seed dormancy. It is thought that that variety is very useful for re-vegetation. We exploited the seed harvester by miner change of handy engine duster. The efficiency of seed collection is very high of this seed harvester compare to hand collection. But, 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.