Study on ecosystem health and variation trend at the Changjiang River Estuary in the past 30 years
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摘要: 为评估长江口海域生态系统健康状况,本文以鱼类浮游生物为指示生物,选择1986年、1999年、2007年和2016年4个年份的数据,选取鱼类浮游生物总种类数、底栖鱼种类数、水层鱼种类数、低耐污鱼种类数、高耐污鱼种类数百分比、杂食性鱼种类数百分比、虫食性鱼种类数百分比、肉食性鱼种类数百分比、鱼类取样个体数、天然杂交种种类数百分比等10个评价指标,采用1、3、5赋值法计算4个不同年份的河口生物完整性指数(Estuarine Biotic Integrity Index,EBI),并以此评价近30年长江口海域生态系统健康状况变化趋势。结果显示,1986年、1999年、2007年和2016年4个不同年份的EBI值分别是52、40、36、34,对应的EBI等级分别为“好”、“一般”、“一般−差”、“差”。通过分析EBI年际变化的结果,发现近30年来长江口海域生态系统健康状况呈现先下降,而后稳定在较低水平的趋势,说明长江口海域生态系统亟需及时进行保护和修复工作。Abstract: In order to assess the health status of ecosystem on the Changjiang River Estuary waters, the ichthyoplankton is used to be indicators. Selecting 10 evaluation indices, which are the total number of ichthyoplankton species, number of benthic species, number of column species, number of intolerant species, proportion of tolerant species, proportion of omnivores, proportion of insectivorous, proportion of carnivores, number of individuals in each sample, proportion of hybrid. This study calculates the estuarine biotic integrity index (EBI) value of the 1986, 1999, 2007 and 2016 by using 1, 3, and 5 approximation of value assignment, and assesses the change trend of the ecosystem health in the Changjiang River Estuary water in recent 30 years. The results show that in 1986, 1999, 2007 and 2016, the EBI values were 52, 40, 36 and 34, respectively, and the corresponding EBI levels were “good”, “fair”, “fair-poor” and “poor”, respectively. By analyzing the results of EBI annual changes, it was found that the health status of ecosystem in the Changjiang River Estuary in recent 30 years showed a trend of declining first and then maintaining at a low level, indicating that the ecosystem of the Changjiang River Estuary waters is urgent to carry out timely protection and restoration.
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表 1 长江口海域EBI评价指标体系
Tab. 1 EBI metric system in the Changjiang River Estuary
属性 指标 种类结构 M1总种类数 M2底栖鱼种类数 M3水层鱼种类数 M4低耐污鱼种类数 M5高耐污鱼种类数百分比 营养结构 M6杂食性鱼种类数百分比 M7虫食性鱼种类数百分比 M8肉食性鱼种类数百分比 鱼类丰度和健康状况 M9鱼类取样个体数 M10天然杂交种种类数百分比 表 2 EBI等级划分和对应的特征描述
Tab. 2 Classification of EBI and the characteristic corresponding to its level
EBI值 EBI等级 特征描述 58~60 极好 鱼类浮游生物群落没有受到人类干扰,所有期望的鱼类浮游生物都能捕获,包括耐受性极差的种类;营养结构平衡;没有天然杂交种、极少感染疾病个体 48~52 好 鱼类浮游生物种类数略低于期望值,耐受性极差的种类消失;营养结构显示环境受到一定压力,但仍极少天然杂交个体 40~44 一般 鱼类浮游生物丰度低,低耐受种少;生态环境质量开始下降 28~34 差 鱼类浮游生物种类变少;耐受性弱的种类更少,耐受性强的种类比例增加;天然杂交种比例上升。 12~22 极差 鱼类浮游生物数量较少,且多为耐受性极强的种类;天然杂交种普遍 表 3 长江口海域鱼类浮游生物名录
Tab. 3 Species categories of ichthyoplankton in the Changjiang River Estuary waters
科 种名 生态类型 1986年 1999年 2007年 2016年 鲱科Clupeidae 远东拟沙丁鱼Sardinops melanostictus M + 鲱科Clupeidae 青鳞小沙丁鱼Sardinella zunasi C + 鲱科Clupeidae 斑鰶Konosirus punctatus M + 鳀科Engraulidae 日本鳀Engraulis japonicus M + + + + 鳀科Engraulidae 凤鲚Coilia mystus B + + + + 鳀科Engraulidae 黄鲫Setipinna taty C + 鳀科Engraulidae 康氏侧带小公鱼Stolephorus commersonnii C + 鳀科Engraulidae 赤鼻棱鳀Thryssa kammalensis C + 灯笼鱼科Scopelidae 七星底灯鱼Benthosema pterotum M + 鲤科Cyprinidae 鳊Parabramis pekinensis F + 鲤科Cyprinidae 鲢Hypophthalmichthys molitrix F + 鲤科Cyprinidae 青鱼Mylopharyngodon piceus F + 鲤科Cyprinidae 鲤科1 Cyprinidae sp. F + 鲤科Cyprinidae 鲤科2 Cyprinidae sp. F + 鲤科Cyprinidae 鲤科3 Cyprinidae sp. F + 银鱼科Salangidae 大银鱼Protosalanx chinensis B + 银鱼科Salangidae 前颌间银鱼Hemisalanx prognathus B + + 银鱼科Salangidae 太湖短吻银鱼Neosalanx prognathus taihuensis B + 银鱼科Salangidae 有明银鱼Salanx ariakensis B + 鲻科Mugilidae 鰉 Liza haematocheilus B + + + 鲻科Mugilidae 前鳞龟鰉Chelon affinis B + 鲻科Mugilidae 棱鰉Liza carinatus B + 鲻科Mugilidae 鲻Mugil cephalus B + 鮨科Serranidae 中国花鲈Lateolabrax maculatus M + 鮨科Serranidae 鳜Siniperca chuatsi F + 鮨科Serranidae 鮨科Serranidae sp. M + 鲷科Sparidae 鲷科Sparidae sp. M + 杜父鱼科Cottidae 松江鲈Trachidermus fasciatus B + 石首鱼科Sciaenidae 黄姑鱼Nibea albiflora C + 石首鱼科Sciaenidae 大黄鱼Larimichthys crocea C + 石首鱼科Sciaenidae 小黄鱼Larimichthys polyactis C + + + + 天竺鲷科Apogonidae 细条天竺鲷Apogon lineatus M + + 银汉鱼科Atherinidae 白氏银汉鱼Allanetta bleekeri C + 鲬科Platycephalidae 鲬Platycephalus indicus M + + + 鴨科Callionymidae 单鳍鴨Draculo mirabilis M + 表 4 EBI 指标赋值标准
Tab. 4 EBI metrics score criteria
属性 指标 评分标准 1 3 5 物种组成 M1总种类数 <18 18~28 >28 M2底栖鱼种类数 <8 8~10 >10 M3水层鱼种类数 <12 12~18 >18 M4低耐污鱼种类数 <16 16~25 >25 M5高耐污鱼种类数百分比 >20% 5%~20% <5% 营养结构 M6杂食性鱼种类数百分比 >45% 20%~45% <20% M7虫食性鱼种类数百分比 <20% 20%~45% >45% M8肉食性鱼种类数百分比 <1% 1%~5% >5% 鱼类丰度和健康状况 M9鱼类取样个体数 <60 60~90 >90 M10天然杂交种种类数百分比 >1% 0~1% 0 表 5 鱼类浮游生物EBI值
Tab. 5 EBI values of ichthyoplankton
属性 1986年 1999年 2007年 2016年 M1总种类数 5 3 1 3 M2底栖鱼种类数 5 3 1 3 M3水层鱼种类数 5 1 3 1 M4低耐污鱼种类数 5 3 3 1 M5高耐污鱼种类数百分比 3 3 3 1 M6杂食性鱼种类数百分比 3 5 5 3 M7虫食性鱼种类数百分比 1 1 3 1 M8肉食性鱼种类数百分比 5 5 5 5 M9鱼类取样个体数 5 5 5 5 M10天然杂交种种类数百分比 5 5 5 5 EBI值 52 40 36 34 -
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