微囊藻是一种间歇性浮游藻类，微囊藻群体能在沉积物中累积和存活。沉积物中的微囊藻通过向水柱的提供种源，促进水柱中微囊藻水华的暴发。微囊藻的存活能力是其能在沉积物中大量累积的关键，向水柱提供种源的能力则决定其对微囊藻水华的贡献。目前关于沉积物中微囊藻存活能力的系统研究还未见报道，对其供种能力的研究主要集中在春季复苏期，尚缺乏全年尺度供种行为对水华贡献的研究。本项目拟结合野外调查、室内模拟和原位试验，揭示影响沉积物中微囊藻存活能力的因素及机制，量化周年内沉积物中微囊藻对水柱的供种能力，为定量评估沉积物中微囊藻群体对水柱中微囊藻水华的贡献提供科学依据。

Microcystis is a meroplanktonic cyanobacterium that can accumulate and survive in the sediment. The recruitment of Microcystis spp. from sediments can provide an inoculum for the pelagic Microcystis bloom and promote the formation of Microcystis bloom. Microcystis colonies with higher viabilities have more chances to accumulate in the sediment, resulting in higher biomass of Microcystis in the sediment. The contribution of benthic Microcystis populations to promote the Microcystis bloom formation is decided by their abilities to inoculate the water column. Up to now, the viabilities of benthic Microcystis spp. haven't been deeply studied and no related reports could be found. Present studies on inoculations mainly focused on cyanobacterial spring recruitment. Information about the contribution of the annual recruitment on the formation of Microcystis bloom is unavailable. In order to evaluate the potential contribution of benthic Microcystis on the subsequent Microcystis bloom in the water column, we carry out microcosms laboratory experiments, field survey and in situ investigation. The special objectives of the study are to (1) elucidate the effect and mechanism of environmental conditions and colonial characteristics on the viability of benthic Microcystis, (2) evaluate the monthly ability of benthic Microcystis to inoculate the water column, (3) estimate the annual contribution of benthic inoculation on the Microcystis bloom. We hope the program will promote the understanding of the contribution of benthic Microcystis population to promote the formation of Microcystis bloom in eutrophic lakes.