Research Center for Engineering Ecology and Nonlinear Science, North China Electric Power University, Beijing, 102206, China.
Environ Sci Pollut Res Int. 2019 Dec;26(34):35240-35252. doi: 10.1007/s11356-019-06655-0. Epub 2019 Nov 7.
Based on the planktonic data monitored in Lake Balihe, an ecosystem health assessment system referring to planktonic index of biotic integrity (P-IBI) was constructed to evaluate the lake health status and study the response mechanism of P-IBI to environmental factors. The results showed that a total of 7 phylum 59 species of phytoplankton and 3 phylum 28 species of zooplankton were identified in the lake, and both the plankton density and biomass varied significantly in time and space scales. The significant variation of Protozoa density should be responsible to the inconsistency between the distributions of zooplankton density and biomass, as well as the lowest value of P-IBI in summer. The P-IBI values and therefore the health levels can be seasonally ranked as winter > autumn > spring > summer and found spatially increased along the flow direction. Based on the relationships between P-IBI and the environmental factors, ammonia nitrogen = 0.46 mg/L and Secchi depth = 63 cm were found as the environmental protection thresholds of planktonic biotic integrity for this freshwater lake ecosystem. The findings of the research may provide some guidance to the ecological monitoring and protection of freshwater lake.
基于在八里河监测到的浮游生物数据，构建了一个浮游生物生物完整性指数（P-IBI）的生态系统健康评估系统，以评估湖泊健康状况，并研究 P-IBI 对环境因素的响应机制。结果表明，湖中共有浮游植物 7 门 59 种，浮游动物 3 门 28 种，浮游生物密度和生物量在时间和空间尺度上均有显著变化。原生动物密度的显著变化可能是浮游动物密度和生物量分布不一致以及夏季 P-IBI 值最低的原因。根据 P-IBI 值和健康水平的季节变化，可以将冬季>秋季>春季>夏季进行排序，并发现沿水流方向空间上呈增加趋势。基于 P-IBI 与环境因素的关系，发现氨氮=0.46mg/L 和透明度=63cm 是该淡水湖泊生态系统浮游生物生物完整性的环境保护阈值。本研究的结果可为淡水湖泊的生态监测和保护提供一些指导。
