Oil-gas remote sensing information is obtained from satellite TM data through graph-ic treatment in the light of the hydrocarbon-microseepage theory. The nine target areas (ofthree types) selected on this basis coinci...Oil-gas remote sensing information is obtained from satellite TM data through graph-ic treatment in the light of the hydrocarbon-microseepage theory. The nine target areas (ofthree types) selected on this basis coincide well with the occurrence of natural gases and have been proved by subsequent prospecting. Plants in the target areas are characterized, as a result of hydrocarbon- microseepage, by abnormal spectral features with the absorption peaks of chlorophyll shifting toward blue light, reflectivity in the range of visible light increasing and re-flectivity in the near infrared region decreasing.展开更多
赤水河是长江上游一级支流,生境类型复杂多样,在长江上游珍稀特有鱼类资源保护方面发挥着至关重要的作用.为了解赤水河健康状况,本研究于2020年5月和9月,在赤水河干流和重要一级支流31个点位开展鱼类调查,采用Shannon-Wiener指数、Simp...赤水河是长江上游一级支流,生境类型复杂多样,在长江上游珍稀特有鱼类资源保护方面发挥着至关重要的作用.为了解赤水河健康状况,本研究于2020年5月和9月,在赤水河干流和重要一级支流31个点位开展鱼类调查,采用Shannon-Wiener指数、Simpson指数、Pielou指数评价鱼类多样性,构建了F-IBI(fish-based index of biotic integrity)指数评价赤水河健康状况.此次调查共采集6288尾,隶属于4目10科26属90种;鱼类Shannon-Wiener指数范围为0.21~2.87,平均值为1.48±0.46;Simpson指数范围为0.08~0.91,平均值为0.69±0.14;Pielou指数范围为0.13~0.97,平均值为0.76±0.13.上游至下游Shannon-Wiener指数和Simpson指数均呈现逐渐升高的变化规律.构建了包含物种总数、鲤形目个体数%、鮈亚科个体数%、鲌亚科个体数%等10个指标在内的F-IBI核心指标体系,采用比值法计算各点位F-IBI值,根据F-IBI值将流域健康状况划分为“健康”(F-IBI≥5.99)、“亚健康”(4.49≤F-IBI<5.99)、“一般”(2.99≤F-IBI<4.49)、“较差”(1.50≤F-IBI<2.99)和“极差”(F-IBI<1.50)5个等级.评价结果显示,所调查点位整体为健康状态,20个点位显示健康状态,5个点位显示亚健康状态,3个点位显示一般状态,3个点位显示较差状态.F-IBI值从上游到下游呈现逐渐上升趋势,且上、中、下游F-IBI值存在显著性差异(P<0.05).干流健康状况优于支流,较差健康点位位于桐梓河、五马河流域,一般健康点位位于习水河流域.研究显示,赤水河鱼类以鲤形目、鲤科为主要种群,构建的F-IBI评价体系可作为人类活动干扰的良好的预测因素,较好地反映赤水河水生生态系统健康状况,可作为赤水河水生生态系统健康评价和资源管理的工具.展开更多
文摘Oil-gas remote sensing information is obtained from satellite TM data through graph-ic treatment in the light of the hydrocarbon-microseepage theory. The nine target areas (ofthree types) selected on this basis coincide well with the occurrence of natural gases and have been proved by subsequent prospecting. Plants in the target areas are characterized, as a result of hydrocarbon- microseepage, by abnormal spectral features with the absorption peaks of chlorophyll shifting toward blue light, reflectivity in the range of visible light increasing and re-flectivity in the near infrared region decreasing.
文摘赤水河是长江上游一级支流,生境类型复杂多样,在长江上游珍稀特有鱼类资源保护方面发挥着至关重要的作用.为了解赤水河健康状况,本研究于2020年5月和9月,在赤水河干流和重要一级支流31个点位开展鱼类调查,采用Shannon-Wiener指数、Simpson指数、Pielou指数评价鱼类多样性,构建了F-IBI(fish-based index of biotic integrity)指数评价赤水河健康状况.此次调查共采集6288尾,隶属于4目10科26属90种;鱼类Shannon-Wiener指数范围为0.21~2.87,平均值为1.48±0.46;Simpson指数范围为0.08~0.91,平均值为0.69±0.14;Pielou指数范围为0.13~0.97,平均值为0.76±0.13.上游至下游Shannon-Wiener指数和Simpson指数均呈现逐渐升高的变化规律.构建了包含物种总数、鲤形目个体数%、鮈亚科个体数%、鲌亚科个体数%等10个指标在内的F-IBI核心指标体系,采用比值法计算各点位F-IBI值,根据F-IBI值将流域健康状况划分为“健康”(F-IBI≥5.99)、“亚健康”(4.49≤F-IBI<5.99)、“一般”(2.99≤F-IBI<4.49)、“较差”(1.50≤F-IBI<2.99)和“极差”(F-IBI<1.50)5个等级.评价结果显示,所调查点位整体为健康状态,20个点位显示健康状态,5个点位显示亚健康状态,3个点位显示一般状态,3个点位显示较差状态.F-IBI值从上游到下游呈现逐渐上升趋势,且上、中、下游F-IBI值存在显著性差异(P<0.05).干流健康状况优于支流,较差健康点位位于桐梓河、五马河流域,一般健康点位位于习水河流域.研究显示,赤水河鱼类以鲤形目、鲤科为主要种群,构建的F-IBI评价体系可作为人类活动干扰的良好的预测因素,较好地反映赤水河水生生态系统健康状况,可作为赤水河水生生态系统健康评价和资源管理的工具.