Table 1 Mean values of experimental parameters in the artificial laboratory stream with control (2 × 6) and treatment groups (2 × 6)
From: Short-term effects of elevated CO2 on periphyton community in an artificially constructed channel
Experimental parameters | Control | Treatment | p | |
|---|---|---|---|---|
Water | Temperature (°C) | 4.8 ± 0.2 | 4.8 ± 0.2 | 0.235 |
pH | 9.18 ± 0.06 | 9.02 ± 0.03 | 0.026 | |
Electric conductivity (μS/cm) | 267.8 ± 2.7 | 268.0 ± 2.8 | 0.611 | |
Chlorophyll-a (μg/L) | 85.12 ± 11.42 | 88.99 ± 11.56 | 0.332 | |
Suspended solid (mg/L) | 23.33 ± 1.22 | 23.08 ± 3.53 | 0.932 | |
NO2-N (μg/L) | 51.00 ± 0.40 | 50.00 ± 0.20 | 0.550 | |
NO3-N (mg/L) | 2.60 ± 0.05 | 2.58 ± 0.05 | 0.184 | |
NH3-N (μg/L) | 10.00 ± 0.20 | 8.00 ± 0.20 | 0.042 | |
Total nitrogen (mg/L) | 3.45 ± 0.07 | 3.43 ± 0.06 | 0.367 | |
PO4-P (μg/L) | 1.30 ± 0.90 | 0.80 ± 0.30 | 0.258 | |
Total phosphorus (μg/L) | 51.00 ± 0.20 | 49.00 ± 0.30 | 0.490 | |
Total organic carbon (mg/L) | 5.34 ± 0.34 | 5.68 ± 0.19 | 0.319 | |
Inorganic carbon (mg/L) | 14.66 ± 0.64 | 13.49 ± 0.64 | 0.112 | |
Total carbon (mg/L) | 20.00 ± 0.65 | 19.17 ± 0.52 | 0.253 | |
Substrate | Periphyton chlorophyll-a (μg/cm2) | 5.28 ± 1.29 | 6.75 ± 1.35 | 0.008 |
Periphyton ash-free dry-matter (mg/cm2) | 1.09 ± 0.15 | 1.29 ± 0.15 | 0.000 | |
Periphyton density (106 cells/cm2) | 4.2 ± 0.7 | 5.6 ± 0.9 | 0.003 | |
Fragilaria capucina var. gracilis (106 cells/cm2) | 3.2 ± 0.5 | 4.3 ± 0.7 | 0.008 | |
Fragilaria capucina (106 cells/cm2) | 0.8 ± 0.2 | 1.0 ± 0.3 | 0.095 | |
Cryptomonas ovata (104 cells/cm2) | 5.9 ± 0.5 | 7.9 ± 0.8 | 0.016 | |
Scenedesmus quadricauda (104 cells/cm2) | 5.3 ± 0.7 | 5.0 ± 0.8 | 0.706 | |
Aulacoseira ambigua (104 cells/cm2) | 3.2 ± 0.6 | 4.2 ± 0.8 | 0.468 | |