Tripathi, N. and Singh, R.S. (2007) Cultivation impacts nitrogen transformation in Indian forest ecosystems. Nutrient Cycling in Agroecosystems , 77. pp. 233-243. ISSN 1385-1314

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Abstract

Two forests and two croplands, converted from the forest ecosystem were studied for 2 years to quantify inorganic N, nitrification, N-mineralization and microbial-N. The available N-pool ranged from 15.23 lg g–1 to 19.84 lg g–1, microbial-N from 20.6 lg g–1 to 80.02 lg g–1 with maximum values in summer season and minimum values in the rainy season. The trend for nitrification and N-mineralization was opposite to that of the size of available N-pool. Mean annual net nitrification rates ranged from 7.07 lg g–1 month–1 to 44.84 lg g–1 month–1 (0.17–1.39 lg g–1 day–1) and net N-mineralization from 6.56 lg g–1 month–1 to 48.53 lg g–1 month–1 (0.21–1.56 lg g–1 day–1). On an average, the pool of available N was slightly higher by 4.81%, while the microbial- N was declined substantially by 41.78% after the conversion of forest into cropland. Cultivation reduced the mean annual net nitrification and net N-mineralization, respectively by 50.71% and 47.67%. Interestingly, seasonal moisture content is negatively correlated to microbial-N and inorganic N and positively related to nitrification and N-mineralization.

Item Type:	Article
Uncontrolled Keywords:	N-mineralization Nitrification Microbial-N Immobilization Seasonal pattern
Subjects:	Envieronmental Management Group
Divisions:	UNSPECIFIED
Depositing User:	Dr. Satyendra Kumar Singh
Date Deposited:	19 Nov 2011 05:52
Last Modified:	19 Nov 2011 05:52
URI:	http://cimfr.csircentral.net/id/eprint/49

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