Publikationsdatum:
1991-08-01
Beschreibung:
A bioassay based on the rate of uptake of 32P by forest tree roots was developed as a predictor of phosphorus fertiliser requirements for mature forest stands. Seasonal variation is known to be significant, and this paper reports on a study that examines the implications of spatial variation on the interpretation of bioassay results. Sampling stands growing on spaced-furrow ploughing indicated that positional or microsite differences interact with season of sampling. The ridges created by this kind of site preparation appeared to be nutritionally impoverished with respect to the flats and furrows, and this effect was most marked in summer. A greenhouse split-root experiment with conifer seedlings indicated that within-plant variability is of less consequence than the spatial variability of the forest floor. Sampling positions are suggested for standardizing sampling procedure.
Print ISSN:
0045-5067
Digitale ISSN:
1208-6037
Thema:
Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft