关键词: 水稻, 等基因系, 植株形态, 竞争, 化感作用

Abstract: By using GIS, RS and GPS techniques and the TM images of 1994 and 2004 , the changes of vegetation landscape patterns in central Nujiang watershed in 1 994〖KG-*2〗-〖KG-*7〗2004 were studied, and the prediction of the changes in ne xt ten years was made by using Markov process model. The results showed that the matrix of the la ndscape in study area was composed of shrub and grass, with other landscape patc hes embedded. In 1994〖KG-*2〗-〖KG-*7〗2004, the most transfers among landscape types were betwe en shrub-grass, semi-humid evergreen broadleaved forest, and coniferous-broad leaved mixed forest. The greatest change occurred in shrub-grass and semi-humid e vergreen broadleaved forest at low elevation, while no obvious change was observed in coniferous-broadleaved mixed forest and cold temperate coniferous forest at high elevation. It was predicted that in the next ten years, the influence of hu man interference on the vegetation succession in the whole watershed would be fu rther increased, the areas of shrub-grass and cold temperate coniferous forest would increase while those of semi-humid evergreen broadleaved forest and humid evergreen broadleaved forest would decrease, the landscape as a whole would be fr agmented, and the regional eco-environment would be seriously affected.

Key words: Rice, Isogenic lines, Plant morphology, Competition, Allelopathy