Impacts of 22-year organic and inorganic N managements on soil organic C fractions in a maize field, northeast China
of organic manure and inorganic N fertilizer. TOC concentration and C storage were significantly increased under the M and MN treatments, but not under the inorganic N treatment. The M treatment was most effective for sequestrating SOC and showed similar
increase in degree of grain yield to the N and MN treatments, therefore it could be the best option for improving soil productivity and C storage in the maize cropping system.
The fertilizer experimental site used in this study was established on a maize field in Shenyang Agriculture University in 1987. The treatments included, CK : unfertlized control, M : organic manure, N : inorganic N fertilizer and MN : combination
Upper Pleistocene comparative OSL, U/Th and C 14 datings of sedimentary sequences and correlative morphodynamical implications in the South-Western Anti-Atlas (Oued Noun, 29°N, Morocco)
A very accurate C-band noise scatterometer/radiometer system in International symposium on Microwave Signatures in Remote Sensing.
Décrit un radiomètre-diffusomètre de bruits opérant dans la bande C, qui permet des précises comparaisons des températures de brillance et des coefficients de rétrodiffusion. - (CB)
Voir analyse des chapitres rédigés par C. Girault et J. La Gra, S. N. Ejedepang-Koge, C. Bouet, H. Berron, Y. Monnier, C. Bouquet, M. M. Ouedraogo et P. Vennetier, J. Saint-Vil, I. de Garine.
Effects of desertification on soil organic C and N content in sandy farmland and grassland of Inner Mongolia
A field experiment was conducted during 2002 and 2003 in Horqin Sand Land, China, to investigate changes in soil C and N contents in relation to land desertification. The AA. compare the amounts of organic C and total N lost by desertification
in farmland and grassland. The results indicate that land desertification by wind erosion is mediated through a loss of soil fine particles, with a resultant decrease in soil organic C and total N.
Stone and gravel contents of arable soils influence estimates of C and N stocks
to an overestimation of C and N stocks by 8-9%. It was concluded that the inclusion of stone and gravel volume of arable soils may be important if nutrient stocks of different sites are compared, or the effects of land use changes are scaled up to regional or global
The chronology is based on approximately 30 C dates of molluscs which were collected from lacustrine and paludal deposits of the Ine Sakane sand sea. Two lacustrine episodes are recorded: ca. 9 500-6 500 yr B.P. and ca. 5 500-4 500 yr B.P
., the latest corresponding to the establishment of numerous Neolithic settlements in the area. The isotopic composition (O and C) of the fauna reflects highly variable hydrological conditions.
Land use and topographic position control soil organic C and N accumulation in eroded hilly watershed of the Loess Plateau
(25 to 30 years) increased SOC and total N by 32% to 119% in the slope and 17% to 81% in the gully, respectively compared with the cropland. It is highlighted that changes in SOC, total N, micobial biomass C and N (MBC and MBN) among topographic
In this study, 5 land uses and 3 topographic positions across an eroded hilly watershed of the Loess Plateau were selected to investigate their effects on soil organic carbon (SOC) and N accumulation. The restored grassland, shrubland and woodland
positions depend on land use. Therefore, land use, topographic position (erosion and deposition), and their interactions regulate SOC and N accumulation and their labile fractions in the eroded hilly region at a watershed scale. These results suggested
that converting cropland to shrubland is an initial strategy to restore degraded ecosystems and increase soil C sequestration in eroded hilly region of the Loess Plateau.