Conservation and improvement of the sanctuary forests for Japanese monkeys and sika deers.

1.保护和改善梅花鹿森林。在千叶县博索山野生动物保护区，梅花鹿的密度如此之高，以至于最恶劣的地面植被变得很差。为了改善野生动物的栖息地，在千叶市东京大学森林实验区设置了防梅花鹿围栏。(1)以东川试验区为例，在安装梅花鹿围栏16个月后，麻栎在栅栏内的最大丛枝高度为113 cm，栅栏外的最大丛枝高度为54 cm。围栏外，除了不适合饲养梅花鹿的新丝虫外，所有的矮树枝都变低或死亡。适口性树种现存量围栏内为118g/m~2，围栏外为1g/m~2。(150)设置防梅花鹿围栏后10个月内，围栏内的苗木密度是围栏外的8倍，物种数是围栏外的3倍，植被盖度是围栏外的15倍。围栏内适口区现存量为40g/m2，围栏外适口区现存量为6g/m2。2.日本猕猴保护区的改良。对千叶县基米图市的高冈山进行了5年的研究。本试验的目的是建立针叶林向阔叶林转化的方法。针叶林采伐后，每公顷有7000多株阔叶树幼苗发芽。通过在砍伐后的四到五年内进行清理处理，形成了有可能为猴子提供多种食物的阔叶林。

1.Conservation and improvement of the forests for Sika deers. The density of sika deer is so high that the ferest floor vegetation become poor in a wildife preservation area of Boso Mounains, Chiba prefecture. In order to improve the habitatfor the wildlife, sika-proof fence were installed at the experiment plot in Tokyo University Forests in Chiba.(1)In the case of Higasinosawa experiment plot.In sixteen months after installing sika-proof fence, the maximum coppice shoot of Quercus acuta in the fence was 113 cm hight, and that outside the fence was 54 cm high. Outsuide the fence, all coppice shoots decreased in height or died, except for Neolistea sericea i.e. the unpaletable species for sika deer. The standing crop of palatable species was 118 g/m^2 in the fence, while that was 1 g/m^2 outside the ence.(2)In the case of Mazawa experiment plot. (150)In ten months after installing sika-proof fence, the density of seedling, nummber of species and vegetation coverage in the fence were eight times, three times and fifteen times, respectively, as compaired with those outside the fence. The standing crop of palatable part was 40 g/m^2 in the fence, while that was 6 g/m^2 outside the fence.2.Improvement of the sancturary forest for Japanese monkeys.The changes of vegetation of the regenration experiment plot in Mt. Takagoyama, Kimitu City, Chiba Prefecture, were studied for 5 years. The purpos for the experiment is to establish the method of conversion from coniferous forest to broad-leaved forest. More than 7,000 seedlings of broad-leaved trees per ha sprouted after the clear cutting of coniferous forest. By a clearing treatment in four to five years after clear cutting, the broad-leaved forest that has possibility to supply monkeys with many food were made.