LAND-USE CHANGE EFFECTS ON SOIL C AND N TRANSFORMATIONS IN SOILS OF HIGH N STATUS: COMPARISONS UNDER INDIGENOUS FOREST, PASTURE AND PINE PLANTATION
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dc.contributor.author | Parfitt R.L. | |
dc.contributor.author | Scott N.A. | |
dc.contributor.author | Ross D.J. | |
dc.contributor.author | Salt G.J. | |
dc.contributor.author | Tate K.R. | |
dc.date.accessioned | 2022-01-11T03:51:27Z | |
dc.date.available | 2022-01-11T03:51:27Z | |
dc.date.issued | 2003 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=5219490 | |
dc.identifier.citation | Biogeochemistry, 2003, 66, 3, 203-221 | |
dc.identifier.issn | 0168-2563 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/34187 | |
dc.description.abstract | Globally, land-use change is occurring rapidly, and impacts on biogeochemical cycling may be influenced by previous land uses. We examined differences in soil C and N cycling during long-term laboratory incubations for the following land-use sequence: indigenous forest (soil age = 1800 yr); 70-year-old pasture planted after forest clearance; 22-year-old pine (Pinus radiata) planted into pasture. No N fertilizer had been applied but the pasture contained N-fixing legumes. The sites were adjacent and received 3-6 kg ha-1 yr-1"volcanic" N in rain; NO3--N leaching losses to streamwater were 5-21 kg ha-1 yr-1, and followed the order forest < pasture = pine. Soil C concentration in 0-10 cm mineral soil followed the order: pasture > pine = forest, and total N: pasture > pine > forest. Nitrogen mineralization followed the order: pasture > pine > forest for mineral soil, and was weakly related to C mineralization. Based on radiocarbon data, the indigenous forest 0-10 cm soil contained more pre-bomb C than the other soils, partly as a result of microbial processing of recent C in the surface litter layer. Heterotrophic activity appeared to be somewhat N limited in the indigenous forest soil, and gross nitrification was delayed. In contrast, the pasture soil was rich in labile N arising from N fixation by clover, and net nitrification occurred readily. Gross N cycling rates in the pine mineral soil (per unit N) were similar to those under pasture, reflecting the legacy of N inputs by the previous pasture. Change in land use from indigenous forest to pasture and pine resulted in increased gross nitrification, net nitrification and thence leaching of NO3--N. | |
dc.subject | 14C | |
dc.subject | 15N | |
dc.subject | AMMONIUM | |
dc.subject | EXTRACTABLE CARBON | |
dc.subject | LIGNIN | |
dc.subject | MICROBIAL BIOMASS | |
dc.subject | NEW ZEALAND | |
dc.subject | NITRATE | |
dc.subject | RESPIRATION | |
dc.title | LAND-USE CHANGE EFFECTS ON SOIL C AND N TRANSFORMATIONS IN SOILS OF HIGH N STATUS: COMPARISONS UNDER INDIGENOUS FOREST, PASTURE AND PINE PLANTATION | |
dc.type | Статья |
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