Algal assemblages and their relationship with water quality in tropical Mexican streams with different land uses
Algal assemblages and their relationship with water quality in tropical Mexican streams with different land uses
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不同土地利用的墨西哥热带溪流中藻类组合及其与水质的关系
DOI：
10.1007/s10750-011-0633-4
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发表时间：
2011
期刊：
影响因子：
2.6
通讯作者：
M. Favila
中科院分区：
文献类型：
--
作者：
G. Vázquez;J. A. Aké;M. Favila
本研究分析物理和化学因素之间的关系和藻类群落的热带溪流中的微型流域，其面积的70%以上有不同的土地利用，特别是云山林，咖啡种植园，牲畜牧场。物理，化学和生物变量进行了测量，每月在每个流超过1年的时间。硝酸盐+亚硝酸盐，总悬浮固体（TSS），和硅流的浓度被发现在旱季和雨季不同。咖啡种植园流表现出最高水平的悬浮固体，硝酸盐+亚硝酸盐和硫酸盐。基于叶绿素a浓度，森林和咖啡种植园流寡中营养，而牧场流中富营养。森林溪流的丰富度和藻类多样性水平最低，其次是咖啡种植园溪流，而牧场溪流是最多样化的。叶绿素a浓度和物种丰富度取决于土地利用和季节。森林覆盖率与嗜酸硅藻和寡富营养硅藻种类呈正相关。咖啡覆盖度与能动物种呈显著正相关，与污染敏感硅藻类群呈显著负相关。结果表明，硅藻组合响应微流域条件，可用于监测土地利用对河流在热带地区的影响。
This study analyzes the relationship between physical and chemical factors and the algal communities in tropical streams in micro-watersheds where >70% of their area has different land uses, specifically, cloud mountain forest, coffee plantations, and livestock pastures. Physical, chemical, and biological variables were measured monthly in each stream over a 1-year period. The concentrations of nitrates + nitrites, total suspended solids (TSS), and silica in the streams were found to differ during the dry and rainy seasons. Coffee-plantation streams showed the highest levels of suspended solids, nitrates + nitrites, and sulfates. Based on chlorophyll a concentration, the forest and coffee-plantation streams are oligo-mesotrophic, while pasture streams are meso-eutrophic. Forest streams displayed the lowest levels of richness and algal diversity, followed by coffee-plantation streams, whereas pasture streams were the most diverse. Chlorophyll a concentration and species richness depended on land use and season. Forest coverage was positively correlated with acidophilous and oligo-eutraphentic diatom species. Coffee coverage displayed a significant positive correlation with motile species and a significant negative correlation with pollution-sensitive diatom taxa. The results show that diatom assemblages responded to micro-watershed conditions and can be used to monitor the effects of land use on streams in tropical regions.