Chemical composition of tundra plant and lichens at Daring Lake, NWT in control and greenhouse plots

Samples of tundra plants and lichens were collected from control and experimental greenhouse plots at Daring Lake Tundra Ecosystem Research Station in the summer of 2011. This included two sets of samples: 1) Mid-August sampling, in which leaves were collected from the deciduous shrub, Betula glandulosa, graminoid, Eriophorum vaginatum, evergreen shrubs, Rhododendron subarcticum (formerly Ledum decumbens) and Vaccinium vitis-idaea. Samples of the lichens, Cetraria cucullata and Cladina rangiferina were also collected. 2) Sampling throughout the growing season, in which Betula glandulosa leaves were collected at two week intervals from late June to early September (six sampling dates). Mid-August samples were analysed for concentrations of nitrogen, phosphorus, total phenolics, and fibre (acid-detergent fibre, acid-detergent lignin, neutral-detergent fibre). Samples collected throughout the season (June to early September) were analysed for concentrations of nitrogen, phosphorus, and total phenolics.