Soil respiration within riparian buffers and adjacent crop fields

Plant and Soil - Tập 229 Số 1 - Trang 117-124 - 2001
Tufekcioglu, A.1, Raich, J.W.2, Isenhart, T.M.1, Schultz, R.C.1
1Department of Forestry, Iowa State University, Ames, USA
2Department of Botany, Iowa State University, Ames, USA

Tóm tắt

We quantified rates of soil respiration among sites within an agricultural landscape in central Iowa, USA. The study was conducted in riparian cool-season grass buffers, in re-established multispecies (switchgrass + poplar) riparian buffers and in adjacent crop (maize and soybean) fields. The objectives were to determine the variability in soil respiration among buffer types and crop fields within a riparian landscape, and to identify those factors correlating with the observed differences. Soil respiration was measured approximately monthly over a two-year period using the soda-lime technique. Mean daily soil respiration across all treatments ranged from 0.14 to 8.3 g C m−2 d−1. There were no significant differences between cool-season grass buffers and re-established forest buffers, but respiration rates beneath switchgrass were significantly lower than those beneath cool-season grass. Soil respiration was significantly greater in both buffer systems than in the cropped fields. Seasonal changes in soil respiration were strongly related to temperature changes. Over all sites, soil temperature and soil moisture together accounted for 69% of the seasonal variability in soil respiration. Annual soil respiration rates correlated strongly with soil organic carbon (R = 0.75, P < 0.001) and fine root (<2 mm) biomass (R = 0.85, P < 0.001). Annual soil respiration rates averaged 1140 g C m−2 for poplar, 1185 g C m−2 for cool-season grass, 1020 g C m−2 for switchgrass, 750 g C m−2 for soybean and 740 g C m−2 for corn. Overall, vegetated buffers had significantly higher soil respiration rates than did adjacent crop fields, indicating greater soil biological activity within the buffers.

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