Nitrogen and phosphorus relationships to benthic algal biomass in temperate streams
Nitrogen and phosphorus relationships to benthic algal biomass in temperate streams
复制标题
DOI：
10.1139/f02-063
复制
发表时间：
2002-05-01
影响因子：
2.4
通讯作者：
Lohman, K
中科院分区：
文献类型：
--
作者：
Dodds, WK;Smith, VH;Lohman, K
了解限制底栖藻类生物量的因素对于理解河流生态系统中的能量流动和河流富营养化至关重要。我们使用了几个数据集来确定水柱营养物和非营养物因子如何与周围植物生物量相关联，以及生态区概念是否适用于营养物-周围植物的关系。在近300个采样周期的温带河流中，收集了关于周生植物生物量、营养物质浓度和其他河流特征的季节均值的文献值。还分析了来自美国国家河流水质监测网络620个站点子集的底栖生物叶绿素和营养物浓度数据。总氮和总磷浓度解释了底栖水系藻类平均生物量和最大生物量模型的最大方差（约40%），断点回归和二维Kolmogorov-Smirnov统计技术建立了显著的断点，约为30杯总P.L-1和40杯总N.L-1，高于这两个值的平均叶绿素值要高得多。生态区域对养分-叶绿素关系的影响较弱。生态区域效应与流域城市和耕地面积百分比、人口密度等人为效应呈交叉相关。因此，在生态区域水平上，必须谨慎区分人为影响和自然变化。
Knowledge of factors limiting benthic algal (periphyton) biomass is central to understanding energy flow in stream ecosystems and stream eutrophication. We used several data sets to determine how water column nutrients and nonnutrient factors are linked to periphytic biomass and if the ecoregion concept is applicable to nutrient-periphyton relationships. Literature values for seasonal means of biomass of periphyton, nutrient concentrations, and other stream characteristics were collected for almost 300 sampling periods from temperate streams. Data for benthic chlorophyll and nutrient concentrations from a subset of 620 stations in the United States National Stream Water-Quality Monitoring Networks were also analyzed. The greatest portion of variance in models for the mean and maximum biomass of benthic stream algae (about 40%) was explained by concentrations of total N and P. Breakpoint regression and a two-dimensional Kolmogorov-Smirnov statistical technique established significant breakpoints of about 30 mug total P.L-1 and 40 mug total N.L-1, above which mean chlorophyll values were substantially higher. Ecoregion effects on nutrient-chlorophyll relationships were weak. Ecoregion effects were cross-correlated with anthropogenic effects such as percent urban and cropland area in the watershed and population density. Thus, caution is necessary to separate anthropogenic effects from natural variation at the ecoregion level.