There was an apparent slight delay in the decline for trees with excavated root collars and those planted at grade.
Equimolar concentrations of 15NH4NO3 or NH415NO3 were supplied to carefully excavated roots that remained attached to plants.
Thereafter, the root system was excavated and sampled as follows.
Root samples of all plants were collected by excavating soil using a handheld hoe starting from the plant's trunk base in four directions of the plant and working out towards to get fine roots within 3 5 m radius.
In other cases, a root sampling procedure is applied where only a fraction of roots from each root system are fully excavated, and then the information from the excavated roots is employed to estimate biomass for the roots not excavated [6, 23, 35].
In other cases, a root sampling procedure is applied where only a fraction of roots from each root system are fully excavated, and then the information from the excavated roots is employed to estimate biomass for the roots not excavated [ 6, 23, 35].
R/S values may also vary if root sampling procedures are applied, for example, where only a number of roots from each root system is fully excavated, and then the information from the excavated roots is used to estimate biomass for the roots not excavated [42-44] [42-44]
R/S values may also vary if root sampling procedures are applied, for example, where only a number of roots from each root system is fully excavated, and then the information from the excavated roots is used to estimate biomass for the roots not excavated [ 42- 44].
Mugasha et al. [6] and Kuyah et al. [23] did not fully excavated the root system, relied on sampling procedures, which might have led to less accurate estimates when compared to cases where all the root system is removed.
Mugasha et al. [ 6] and Kuyah et al. [ 23] did not fully excavated the root system, relied on sampling procedures, which might have led to less accurate estimates when compared to cases where all the root system is removed.
F.H. provided birch root samples.
