NDLI: Soil nitrogen heterogeneity in a Dehesa ecosystem

Content Provider	Springer Nature Link
Author	Gallardo, A. Rodríguez Saucedo, J.J. Covelo, F. Fernández Alés, R.
Copyright Year	2000
Abstract	The Dehesa are savannah-like ecosystems that occupy extensive areas in the mediterranean regions of Southern Spain and Portugal. The changes in the soil nitrogen (N) potential mineralisation rate, microbial biomass-N and available mineral N in soils were studied over 1 year in a Dehesa ecosystem, in the SW of Spain. The temporal variability of soil samples was compared by using the coefficient of variation of samples taken on a monthly basis. Spatial variability of the soil samples was measured by comparing the variograms generated with geostatistical techniques. The potential N mineralisation reached a maximum in the spring and summer samples, and a minimum in the autumn. However, the soil NH$_{4}$ $^{+}$, NO$_{3}$ $^{-}$ and microbial biomass-N showed maximum levels in winter, compared with minimum levels in the spring and summer. The potential mineralisation rate showed a higher temporal variability in the samples taken under tree canopies, due to highest maximum and similar minimum levels reached during the sampling period. The potential mineralisation rate, microbial biomass-N and soil mineral N were higher under the tree canopies than in the open grassland. The spatial distribution of the soil organic matter and available NH$_{4}$ $^{+}$ was strongly influenced by tree canopy size. The semivariograms were adjusted to a spherical model, indicating a maximum NH$_{4}$ $^{+}$ variability at a certain distance from the tree crown diameter. The same was not the case for the spatial distribution of the soil NO$_{3}$ $^{-}$ from the tree crown. Our results indicate that the tree component of a Dehesa ecosystem is a major influence in the spatial and temporal heterogeneity of soils.
Starting Page	71
Ending Page	82
Page Count	12
File Format	PDF
ISSN	0032079X
Journal	Plant and Soil
Volume Number	222
Issue Number	1-2
e-ISSN	15735036
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2000-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Ecology Plant Sciences Plant Physiology Soil Science & Conservation
Content Type	Text
Resource Type	Article
Subject	Soil Science Plant Science

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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