Please use this identifier to cite or link to this item: http://archive.cmb.ac.lk:8080/xmlui/handle/70130/5194
Full metadata record
DC FieldValueLanguage
dc.contributor.authorLokupitiya, E.Y.K.-
dc.contributor.authorPaustian, K.-
dc.contributor.authorEaster, M.-
dc.contributor.authorWilliams, S.-
dc.contributor.authorAndre´n, O.-
dc.contributor.authorKa¨tterer, T.-
dc.date.accessioned2021-04-20T04:50:02Z-
dc.date.available2021-04-20T04:50:02Z-
dc.date.issued2010-
dc.identifier.urihttp://archive.cmb.ac.lk:8080/xmlui/handle/70130/5194-
dc.description.abstractCarbon (C) added to soil as organic matter in crop residues and carbon emitted to the atmosphere as CO2 in soil respiration are key determinants of the C balance in cropland ecosystems. We used complete and comprehensive county-level yields and area data to estimate and analyze the spatial and temporal variability of regional and national scale residue C inputs, net primary productivity (NPP), and C stocks in US croplands from 1982 to 1997. Annual residue C inputs were highest in the North Central and Central and Northern Plains regions that comprise *70% of US cropland. Average residue C inputs ranged from 1.8 (Delta States) to 3.0 (North Central region) Mg C ha-1 year-1, and average NPP ranged from 3.1 (Delta States) to 5.4 (Far West region) Mg C ha-1 year-1. ResidueCinputs tended to be inversely proportional to the mean growing season temperature. A quadratic relationship incorporating the growing season mean temperature and total precipitation closely predicted the variation in residue C inputs in the North Central region and Central and Northern Plains. We analyzed the soil C balance using the crop residue database and the Introductory Carbon Balance regional Model (ICBMr). Soil C stocks (0–20 cm) on permanent cropland ranged between 3.07 and 3.1 Pg during the study period, with an average increase of *4 Tg C year-1, during the 1990s. Interannual variability in soil C stocks ranged from 0 to 20 Tg C (across a mean C stock of 3.08 ± 0.01 Pg) during the study period; interannual variability in residue Cinputs varied between 1 and 43 Tg C (across a mean input of 220 ± 19 Tg). Such interannual variation has implications for national estimates of CO2 emissions from cropland soils needed for implementation of greenhouse gas (GHG) mitigation strategies involving agriculture.en_US
dc.language.isoenen_US
dc.publisherSpringer Netherlandsen_US
dc.subjectClimate change Cropland carbon cycling Agriculture Carbon budgets Regional and national scaleen_US
dc.titleCarbon balances in US croplands during the last two decades of the twentieth centuryen_US
dc.typeArticleen_US
Appears in Collections:Department of Zoology

Files in This Item:
File Description SizeFormat 
carbon balance paper.pdf918 kBAdobe PDFView/Open


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.