关键词: 棉花, 植被指数, 叶绿素含量, 淹水胁迫, 高光谱特征

Abstract: A seasonal investigation of macrozoobenthos in Lake Nansi was carried out during April to December, 2010. Altogether 36 benthic taxa, including 5 annelids, 10 molluscs, 15 arthropods, and 6 other animals, were identified. Among them, Limnodrilus hoffmeisteri, Bellamya purificata, Alocinma longicornis and Propsilocerusi akamusi were dominant, accounting for 88.1% of the total number. Density and biomass of macrozoobenthos were 1119 ind·m^-2 and 83.23 g·m^-2, respectively. Species richness, dominant species and standing crops varied significantly in different seasons, and also in different areas. Water quality was assessed using Shannon index, Margalef index and Hilsenhoff biotic index. It was shown that Lake Nansi was moderately polluted in general during the sampling period; water quality in spring and winter was slightly better than that in summer and autumn. In terms of the four lake regions, Lake Nanyang and Lake Zhaoyang were heavily polluted, Lake Dushan was moderately to heavily polluted, and Lake Weishan was
moderately polluted.

Key words: hyper-spectral characteristics, cotton, chlorophyll content, vegetation index., waterlogging stress