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用Gessner等提出的树叶凋落物分解模式对横石水河的功能完整性和生态系统健康进行评价,对比了藜蒴和荷木2个树种的树叶凋落物在横石水河各污染样点和未受污染样点的分解速率.结果表明:藜蒴和荷木树叶凋落物在研究区污染样点的分解速率均显著低于清洁样点(P<0.05);根据Gessner模式,各污染样点的环境得分均为0,而各清洁样点的环境得分均为2,表明横石水河污染河段的健康状态已受到严重破坏.研究区生态系统健康的生物学评价与水质分析结果一致,表明树叶凋落物分解模式是一个合适的评价河流状态的指数.
The functional integrity and ecosystem health of Hengshui River were evaluated by the leaf litter decomposition model proposed by Gessner et al. The effects of leaf litter, The results showed that the decomposition rate of litter samples of Chenopodiaceae and Schima superba in the study area was significantly lower than that of the clean sample (P <0.05). According to the Gessner model, And the environmental scores of all the clean sample sites were both 2, indicating that the health status of Hengshui River pollution has been severely damaged.The biological evaluation of ecosystem health in the study area is consistent with the results of water quality analysis, It shows that the leaf litter decomposition model is a suitable index to evaluate the state of rivers.