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Soil carbon pools under poplar-based agroforestry, rice-wheat, and maize-wheat cropping systems in semi-arid India

Nutrient Cycling in Agroecosystems volume 92, pages 107–118 (2012)Cite this article

Abstract

Labile fractions of soil organic C are considered important indicators of soil quality as these can respond rapidly to land-use changes and agricultural management. We studied the impact of three different land-use systems viz. poplar-based agroforestry involving wheat-legume rotation, rice-wheat and maize-wheat agroecosystems, on dynamics of total organic C (TOC), oxidisable soil organic C (SOC), very labile, labile, less labile, and recalcitrant C fractions, water extractable organic carbon (WEOC), hot water soluble C (HWC), microbial biomass C (MBC), and mineralizable C in the semi-arid subtropical India. The maize-wheat and agroforestry systems had 65–88% higher SOC stocks than the rice-wheat system and were characterized by predominantly labile C. About 56–60% of the total organic C in maize-wheat and agroforestry systems occurred as labile and very labile C compared to 37% under rice-wheat rotation. Contrarily, the majority of organic C (63%) in rice-wheat soils was stabilized in less labile and recalcitrant forms. The HWC and MBC were also higher in maize-wheat and agroforestry systems as opposed to the rice-wheat system. In the discriminant function analysis, a composite of indicators involving TOC, recalcitrant C and total N correctly distinguished the soils under the three systems. The results suggested that in agroforestry and maize-wheat systems the organic C in soils was less stable and thus could be lost following the land-use change.

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Authors and Affiliations

  1. Department of Soil Science, Punjab Agricultural University, Ludhiana, 141004, India

    D. K. Benbi, Kiranvir Brar, A. S. Toor, Pritpal Singh & Hargopal Singh

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  1. D. K. Benbi
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  2. Kiranvir Brar
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  3. A. S. Toor
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  4. Pritpal Singh
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  5. Hargopal Singh
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Correspondence to D. K. Benbi.

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Benbi, D.K., Brar, K., Toor, A.S. et al. Soil carbon pools under poplar-based agroforestry, rice-wheat, and maize-wheat cropping systems in semi-arid India. Nutr Cycl Agroecosyst 92, 107–118 (2012). https://doi.org/10.1007/s10705-011-9475-8

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Keywords

  • C
  • Land-use
  • Labile carbon
  • Recalcitrant carbon
  • Organic carbon fractions
  • Soil microbial biomass