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Gewählte Publikation:

Hood, RC.
(2001): The effect of soil temperature and moisture on organic matter decomposition and plant growth
ISOT ENVIRON HEALT S. 2001; 37(1): 25-41. FullText FullText_BOKU

The effect of soil temperature and moisture on plant growth and mineralisation of organic residues was investigated using N-15-labelled soybean residues and temperature-controlled tanks in the glasshouse. Treatments were arranged in a factorial design with: three soil temperatures (20, 26 and 30 degreesC), two soil moisture regimes (8% (- 800 Kpa) or 12% (- 100 Kpa)), soybean residues added (enriched at 1.82 atom % N-15 excess) or no residues; and either sown with ryegrass or not sown. Pots were sampled six weeks after planting and N-15-enrichment and delta C-13 of the plant and soil fractions were determined. Soil inorganic N was also periodically measured. Available inorganic N increased significantly with addition of residues and generally decreased with increasing temperature. Plant dry matter decreased significantly with increase in soil temperature and increased with increasing moisture. Root-to-shoot ratio declined with increased temperature and moisture. Percentage nitrogen derived from residues (%Ndfr) increased linearly with increased temperature and moisture. Delta C-13 decreased linearly with increasing temperature and decreasing moisture status. There was a significant correlation between transpiration and dry matter production, but there was no correlation between water use efficiency and Delta C-13. The results suggest that C:N ratio of the root material effects the root turnover and in turn the water supply capacity of the root system.
Autor*innen der BOKU Wien:
Hood-Nowotny Rebecca

Find related publications in this database (Keywords)
carbon 13
natural variations
nitrogen 15
root turnover

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