Artificial propagation by seeding 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。因此，许多生态学家建议使用本地草作为人工草地。但是，利用本地牧草存在着种子采集困难等问题。日本原生草种子小，且具冠毛，采集难度大。我们不能使用普通的种子收割机为本地草。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。因此，我们试图寻找适当的品种进行重新植被。同时，我们还尝试开发了适合本地牧草的种子收获机，发现了一些遗传分化的白茅品种。一个品种种子大，没有种子休眠。据认为，该品种是非常有用的植被恢复。我们用轻便发动机喷粉机改装成种子收获机。与手工采种相比，该机采种效率高.但是，由于高功率下采集的粗糙，给种子的萌发带来了一些问题。要利用本地牧草进行种子繁殖，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.