【摘要】 呼伦湖地处中高纬度温带半干旱区,属于中温带大陆性草原气候,湖泊冰封期长达6个月,冰封期和非冰封期湖泊水体的营养状态具有显著的差异性。基于2015—2017年冰封期与非冰封期湖泊水质监测数据,采用综合营养状态指数法分析冰封期与非冰封期呼伦湖湖泊水体营养状态的变化特征,同时通过非线性概率Probit模型建立了呼伦湖富营养化影响因子模型并对湖泊水体富营养化主要影响因子讨论分析,研究结果表明呼伦湖总体上呈现轻度富营养化程度,2015—2017年呼伦湖冰封期内水体富营养化程度变化特征为2015—2017富营养化程度逐年增加,而非冰封期内水体富营养化程度的变化特征呈现2016年富营养化程度最大2017年最小,且冰封期内水体富营养状态程度较非冰封期严重;建立的呼伦湖富营养化影响因子的非线性概率Probit模型表明影响水体富营养化的主要水环境因子为总磷(TP)、pH值、盐度(S)、水深(H)、总氮(TN)及溶解氧(DO),其中总磷(TP)因子的响应概率为65.7%,对呼伦湖湖泊水体富营养化程度影响最大,说明磷是呼伦湖水体富营养化的重要限制因子,并且各主要水环境影响因子与综合营养状态指数间具有显著的相关关系,表明呼伦湖水体营养状态的改善可通过调节水体内各水环境因子维持相对平衡,同时加大对湖周围人类活动的管理,加强对禁牧的宣传来实现。更多还原

【Abstract】 Hulun Lake is located in the semi-arid, mid-high latitude, and continental grassland climate zone with an icebound period of 6 months. A significant difference in the eutrophic state of the lake water was observed between the icebound and non-icebound period. Based on the lake water quality monitoring data in 2015-2017, the difference was analyzed by using comprehensive eutrophic state index. The nonlinear probability Probit model was also applied to identify the major impact factors on the difference according to the change characteristics of the lake water eutrophic state. The results showed that, on the whole, there was a mild eutrophication in Hulun Lake. However, the lake water eutrophication was gradually increased during the icebound period from 2015 to 2017. But, it get the worst in 2016 and turned to the best in 2017 during the non-icebound period. Meanwhile, the degree of the lake water eutrophication was more serious during the icebound period than that of the non-icebound period. The total phosphorus(TP), p H, salinity(S), water depth(H), total nitrogen(TN), and dissolved oxygen(DO) were identified as the major factors that control the lake water eutrophication degree in both the icebound and non-icebound period. Although all the impact factors had a significant correlation with the comprehensive eutrophic state index, TP was the most sensitive factors that affected the lake water eutrophication with a response probability of 65.7%. This indicated that the eutrophic state of Hulun Lake would be improved by controlling the content of TP and adjusting a relative content balance among the major lake water environment factors.更多还原