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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 496567
Title Carbon budget of a winter-wheat and summer-maize rotation cropland in the North China plain
Author(s) Wang, Yuying; Hu, Chunsheng; Dong, Wenxu; Li, Xiaoxin; Zhang, Yuming; Qin, Shuping; Oenema, Oene
Source Agriculture, Ecosystems and Environment 206 (2015). - ISSN 0167-8809 - p. 33 - 45.
DOI https://doi.org/10.1016/j.agee.2015.03.016
Department(s) Alterra - Sustainable soil management
PE&RC
Publication type Refereed Article in a scientific journal
Publication year 2015
Keyword(s) Eddy covariance - Net carbon budget - Net primary production - Soil respiration - The North China plain - Winter wheat-summer maize rotation
Abstract

Crop management exerts a strong influence on the agroecosystem carbon (C) budget. From October 2007 to October 2008, the net C budget of an intensive winter-wheat and summer-maize double cropping system in the North China Plain (NCP) was investigated in a long-term field experiment with crop residues input, using a combination of eddy covariance, crop growth and soil respiration measurements. The objectives were to qualify the annual C budget and to establish the effects of climatic variables and crop management on C budget.The net ecosystem exchange of CO2 (NEE) was partitioned into gross primary production (GPP) and total ecosystem respiration (TER); meanwhile, net primary production (NPP) and soil respiration (SR) were determined to compute autotrophic and heterotrophic respirations. Results showed that the NEE, NPP and SR were 359, 604 and 281gCm-2 in wheat season respectively, and 143, 540 and 413gCm-2 in maize season respectively. Autotrophic respiration dominated TER and was mainly driven by GPP. The net C budget was calculated seasonally based on NPP and considering C input through crop residues and C output through grain harvest. We found the winter-wheat system was a C sink of 90gCm-2; whereas, the summer-maize system was a C source of 167gCm-2. Thus, the double cropping system behaved as a C source of 77gCm-2 on an annual basis, corresponding to an annual average loss rate of nearly 1% in topsoil organic carbon stocks during 2003-2008. Though the season length was 52% shorter for maize (113 days) than that for wheat (235 days), over 55% of the CO2 emissions originated from the warmer and rainy maize season; this implies that the inter seasonal climate variability affected the C flux dynamics mainly and the interaction of soil temperature and moisture is the "single" dominant factor for ecosystem respiration in this area. Our study provides evidence that C was being lost from the intensive wheat-maize double cropping system in the NCP at a rate of 77gCm-2year-1 when harvest removals were considered, even though crop residue C was inputted into the soil since 30 years ago.

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