Table 1. Site and stand characteristics of the data (averages of each studied peatland). | ||||

Peatland | ||||

Characteristic | 1 | 2 | 3 | 4 |

Site type^{*)} | MtkgII | VatkgII | PtkgII | PtkgII |

Latitude | 61°51.5′ | 61°53.1′ | 62°08.9′ | 62°09.3′ |

Longitude | 23°41.9′ | 23°38.9′ | 23°24.7′ | 23°24.5′ |

Peat thickness, m | 4.8 | 4.1 | 1.3 | 1.2 |

Stand volume, m^{3 }ha^{–1} | 258.6 | 72.3 | 168.0 | 324.8 |

Stand basal area, m^{2 }ha^{–1} | 28.5 | 12.8 | 21.8 | 38.2 |

*) following the site type classification of Laine et al. (2012). |

Table 2. Minimum, mean and maximum values (mm) of the weather variables (ET = evapotranspiration, P = precipitation) in the data (years 2014 and 2015 pooled). | |||

Variable | min. | mean | max. |

ET1d ^{*)} | 0.4 | 3.1 | 5.5 |

ET3d | 2.2 | 10.3 | 18.3 |

ET5d | 6.3 | 18.3 | 31.1 |

ET10d | 10.4 | 35.6 | 51.5 |

ET2w | 13.6 | 54.5 | 73.9 |

ET3w | 23.2 | 82.6 | 115.8 |

ET4w | 36.3 | 106.8 | 135.0 |

P1d | 0.0 | 3.2 | 27.4 |

P3d | 0.0 | 5.4 | 27.4 |

P5d | 0.0 | 8.7 | 48.8 |

P10d | 0.0 | 19.5 | 53.5 |

P2w | 0.0 | 24.6 | 59.4 |

P3w | 3.5 | 27.1 | 73.3 |

P4w | 5.5 | 45.7 | 83.2 |

^{*)} 1d = one day, 2d = two days, …, 2w = two weeks, etc. |

Table 3. A null model (intercept only) and the final model for drained peatland WTD during the growing season. | ||||

Null model | Final model | |||

Parameter | Estimate | std error | Estimate | std error |

Fixed part | ||||

Intercept | 27.926 | 5.597 | 37.353 | 4.879 |

DDist | –0.790 | 0.079 | ||

Vol*DOY*10^{–4} | 0.635 | 0.203 | ||

ET4w*DOY*10^{–3} | 0.610 | 0.061 | ||

P4w | –0.256 | 0.015 | ||

Random part | Variance | Variance | ||

Site | 87.31 | 46.514 | ||

Transect | 13.33 | 17.428 | ||

Sample plot | 48.24 | 1.907 | ||

Sample plot:year | 23.77 | 37.043 | ||

Random error | 120.12 | 48.825 | ||

DDist = distance to nearest ditch, m Vol = Volume of the sample plot with 3 m radius, m ^{3 }ha^{–1} DOY = Julian day ET4w = four-week evapotranspiration, mm P4w = four-week precipitation, mm |