In the previous paper, the authors carried out identification of C
3 and C
4 species of the grass family in Japan, then investigated the geographical distribution of them with special reference to climatic conditions. In the present paper, by means of the same method, we tried to investigate the geographical distribution of C
3 and C
4 species of the grass family occurred in Korea and Taiwan which are located at near Japan, Hainan and
Java
which are located at the subtropics or tropics of South East Asia. As to the distribution of C
3 and C
4 species along altitudinal gradient in
Java
, special analysis was carried out. Obtained results are as follows : 1) The districts concerened with the present study exclusively belong to the South East monsoon regions, especially Taiwan, Hainan and
Java
belong to the wet-subtropics or tropics. These districts are comparatively poor in no. of species belonging to subfamily Eragrostoideae, in contrast, abundant in that of Panicoideae. It is noted that the proportion of species of tribe Andropogoneae in subamily Panicoideae are comparatively abundant, and also it should be noted that no. of C
3 species of Panicoideae are rather abundant. 2) In general, increases in percent C
4 with latitudinal descension occurred. The latitude of
Java
is lower than that of Hainan. However, in spite of lower latitude, Percent C
4 of
Java
(66%) is lower than that of Hainan (81%). In
Java
, there are many high mountains (3000-4000 m), but Hainan is not so high, its only 1800 m at the highest. This fact drops percent C
4 of
Java
under that of Hainan. The same situation is applied to the case of comparison between Taiwan (60%, 22-25°N) and Ishigaki (70%, 24°N). 3) In
Java
, percent C
4 decreases markedly with ascension of altitude. This fact is caused by the increase of no. of species belonging to Festucoideae. It is considered that climatic temperature falls down with ascension of altitude, and the no. of species belonging to Festucoideae which agree with cool climatic conditions increase rapidly at higher latitude. In spite of their latitudinal sites.
Java
and Taiwan have so many species belonging to Festucoideae. This fact supports the above mentioned deduction.
抄録全体を表示