Nitrogen mineralisation indices in ferrosols under eucalypt plantations of North-Western Tasmania: association with previous land use
| Autor: | Xiujun Wang, G. K. Holz, Philip J. Smethurst |
|---|---|
| Rok vydání: | 1996 |
| Předmět: |
Mediterranean climate
Soil health geography geography.geographical_feature_category biology Chemistry Soil organic matter Pinus radiata Soil Science Environmental Science (miscellaneous) biology.organism_classification Pasture Nutrient Agronomy Soil water Eucalyptus delegatensis Earth-Surface Processes |
| Zdroj: | Soil Research. 34:925 |
| ISSN: | 1838-675X |
| DOI: | 10.1071/sr9960925 |
| Popis: | Potentially mineralisable N was studied in the laboratory and in the held in ferrosols from eucalypt plantations and pastures in north-western Tasmania. The plantation sites previously supported either Pinus radiata plantations (ex-pine), mixed eucalypt-myrtle forest (ex-mixed), or open Eucalyptus delegatensis forest with a grass understory (ex-dele). Ranges of concentrations of organic C and total N, and C to N ratio, were 6.9-13.6%, 0.297-0.978%, and 10.3-30.4, respectively. The concentration of organic C was independent of previous land use, but rankings for total N, anaerobically mineralisable N, and extractable N in hot KCl were pasture > to ex-dele = ex-mixed > ex-pine. The ratio C:N in theex-pine group (23.6) was higher than ratios in other groups (13.1-15.6). Anaerobically mineralisable N ranged from 49 to 214 �g/g, and was highly correlated with total N and extractable N in hot KCl at 95�C for 16 h (r = 0.83 for both cases, P < 0.001). The C:N ratio was negatively correlated with total N and anaerobically mineralisable N (r = 0.56 and 0.70, P < 0.01). The results indicated that the pasture soils had greater availability of mineral N, and that total N, C:N ratio, and anaerobically mineralisable N may provide useful information for assessing N mineralisation in these soils. |
| Databáze: | OpenAIRE |
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