Impact of Savannization on Nitrogen Mineralization in an Indian Tropical Forest
IR@CIMFR: CSIR-Central Institute of Mining and Fuel Research, Dhanbad
View Archive Info| Field | Value | |
| Title |
Impact of Savannization on Nitrogen Mineralization in an Indian Tropical Forest
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| Creator |
Singh, Raj Shekhar
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| Subject |
Envieronmental Management Group
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| Description |
The effects of conversion of an Indian dry tropical forest ecosystem into savanna, on mineral nitrogen (N), net N-mineralization rate and microbial biomass carbon (MBC), nitrogen (MBN) and phosphorus (MBP) in soil were
studied for two years. There was a marked seasonal variation in all the above parameters at both (upper, 0-10 cm and
lower, 10-20 cm) the soil depths of forest and savanna ecosystems. In forest ecosystems the mean annual values of
mineral N, net nitrification rate, net N-mineralization rate, MBC, MBN and MBP at both depths were 17.41 and 13.2
µg g-1, 18.76 and 10.96 µg g-1mo-1, 23.54 and 12.83 µg g-1mo-1 , 623 and 195µg g-1, 116 and 29µg g-1, 16 and 9µg g-1,
respectively; while in savanna ecosystems the values were 20.15 and 15.73 µg g-1, 10.74 and 6.29 µg g-1mo-1, 16.59
and 10.11 µg g-1mo-1, 453 and 150µg g-1, 79 and 21.7µg g-1, 13 and 6µg g-1, respectively. The soil microbial biomass
was positively related to root biomass and total plant biomass (i.e., above- and below-ground biomass). Interestingly,
seasonal soil moisture and temperature are reciprocally related to microbial biomass and mineral N and directly
related to nitrification and N-mineralization. The microbial biomass, nitrification and N-mineralization are negatively related to clay content. Savannization caused significant loss of soil mean organic carbon (OC), total N (TN) total mean annual nitrification, N-mineralization, MBC, MBN and MBP by 40, 42, 27, 27, 29 and 7%, respectively at upper soil depth and 18, 21, 42, 29 and 22%, respectively at lower soil depth. The reflectances of soil microbial biomass to OC were 1.22 and 1.06 folds at upper and lower soil depths, respectively.
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| Date |
2012
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| Type |
Article
PeerReviewed |
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| Identifier |
Singh, Raj Shekhar (2012) Impact of Savannization on Nitrogen Mineralization in an Indian Tropical Forest. Forest Research, 1 (3). pp. 1-10.
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| Relation |
http://cimfr.csircentral.net/2429/
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