关键词: 细菌16S核糖体RNA基因, 限制性片段长度多型性, 植被

Abstract: The small watershed of Hunchun River in Henan Provice is one of the pilot sites designated for small watershed management by the State Bureau of water mangement.This paper summarized the experience of water management in this area during 1986～1999, as well as the benefits achived in the recent years.The effect of water soil conservation on decreasing water,soil and fertilizer erosion,and increasing the local income in agriculture,forestry,and stockbreeding is discussed.The short and long term integrated benefit is analyzed also.Although the accuracy on the estimation of soil erosion decrease and crop benefit increase is rather limited,the primary results indicate that the integrated management with water soil conservation in small watershed is economically beneficial.

Key words: Bacterial 16S ribosomal RNA gene, Restriction fr agment length polymorphism, Vegetation