20130401

Author : Schmidt, M. W. I. Torn, M. S. Abiven, S. Dittmar, T. Guggenberger, G.Janssens, I. A. Kleber, M. Kogel-Knabner, I. Lehmann, J. Manning, D. A. C. Nannipieri, P. Rasse, D. P. Weiner, S. Trumbore, S. E.
Year :  2011
Title : Persistence of soil organic matter as an ecosystem property
Journal : Nature
Comment :
1) Root-derived carbon is retained in soils much more efficiently than are above-ground inputs of leaves and needles. Isotopic analyses and comparisons of root and shoot biomarkers confirm the dominance of root-derived molecular structures in soil and of root-derived carbon in soil microorganisms. Fresh root inputs may ‘prime’ microbial activity, leading to faster decomposition of older organic matter.

2) Despite their low carbon concentrations, subsoil horizons contribute to more than half of the global soil carbon stocks. In fact, the response of deep soils to land-use change can equal that from the top 30 cm of soil.

댓글

댓글 쓰기

이 블로그의 인기 게시물

20131218

Author  : Edmondson, J. L. Davies, Z. G. McHugh, N. Gaston, K. J. Leake, J. R. Year  : 2012 Title  : Organic carbon hidden in urban ecosystems Journal  : Scientific Reports Comment   : To date, the total quantity of OC stored in urban soils (under both impervious surfaces and greenspaces), together with that in above-ground vegetation, has never been systematically measured.  They report the first city-wide organic carbon (OC) budget for vegetation and soils, including under impervious surfaces. The majority of OC (82%) was held in soils, with 13% found under impervious surfaces, and 18% stored in vegetation.
자세한 내용 보기

20140731

Author  : Chen, Y. J. Day, S. D. Shrestha, R. K. Strahm, B. D. Wiseman, P. E. Year  : 2014 Title  : Influence of urban land development and soil rehabilitation on soil-atmosphere greenhouse gas fluxes Journal  : Geoderma Comment   : Typical land development practices did not increase global warming potential (GWP) when compared to undeveloped land. Post-development soil rehabilitation, however, resulted in greater GWP than both undisturbed soils and those subjected to typical development practices driven primarily by increased CO2 efflux.
자세한 내용 보기

The concurrent decline of soil lead and children’s blood lead in New Orleans

이미지
The concurrent decline of soil lead and children’s blood lead in New Orleans Howard W. Mielke ,  Christopher R. Gonzales ,  Eric T. Powell ,  Mark A. S. Laidlaw ,  Kenneth J. Berry ,  Paul W. Mielke  Jr. , and  Sara Perl Egendorf PNAS  first published October 14, 2019  https://doi.org/10.1073/pnas.1906092116 Significance The inextricable link between topsoil lead (Pb) and children’s blood lead (BPb) has not been widely accepted. Pb is associated with multiple health adversities. Urban residents are at risk from exposure to legacy Pb dust in topsoil resulting from smelting, industrial discharges, leaded gasoline emissions, leaded paint, and incineration. In New Orleans, topsoil median Pb decreased in ∼15 y from 99 mg/kg to 54 mg/kg, or ∼2.4 mg⋅kg⋅y −1 . In ∼12 y, children’s median BPb declined from 3.6 μg/dL to 1.3 μg/dL, or ∼0.2 μg⋅dL⋅y −1 . We argue that depletion of topsoil Pb is an important factor in the continuous dec...
자세한 내용 보기