Priming effect of (13)C-labelled wheat straw in no-tillage soil under drying and wetting cycles in the Loess Plateau of China.
The objectives of this study were to determine the effects of drying and wetting (DW) cycles on soil organic carbon (SOC) mineralisation and on the priming effect (PE) induced by the addition of (13)C-labelled wheat straw to long-term no-tillage (NT) and conventional-tillage (CT) soils. We observed that the SOC mineralisation rate in rewetted soils was greater than that in soils that were kept at constant water content. The proportion of CO2 derived from the straw declined dramatically during the first 10 days. The priming direction was first positive, and then became slightly negative. The PE was higher under DW cycles than under constant water content. There was no significant effect of the tillage system on the SOC mineralisation rate or PE. The data indicate that the DW cycles had a significant effect on the SOC mineralisation rate and on the PE, demonstrating a positive combined effect between wheat straw and moisture fluctuations. Further research is needed to study the role of microbial communities and C pools in affecting the SOC mineralisation response to DW cycles.
Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing, 100081, PR China.|Key Laboratory of Dryland Farming Agriculture, Ministry of Agriculture of the People's Republic of China (MOA), Beijing, 100081, PR China.
Enke
E
Liu
Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing, 100081, PR China.|Yanqing Service Center of Cropping Cultivation, Beijing, 102100, PR China.
Jianbo
J
Wang
Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing, 100081, PR China.|Key Laboratory of Dryland Farming Agriculture, Ministry of Agriculture of the People's Republic of China (MOA), Beijing, 100081, PR China.
Yanqing
Y
Zhang
Agriculture and Agri-Food Canada, Québec City, QC Canada G1V 2J3.
Denis A
DA
Angers
Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing, 100081, PR China.|Key Laboratory of Dryland Farming Agriculture, Ministry of Agriculture of the People's Republic of China (MOA), Beijing, 100081, PR China.
Changrong
C
Yan
International Center for Agricultural Research in the Dry Areas, Damascus, Syrian Arab Republic.
Theib
T
Oweis
Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing, 100081, PR China.|Key Laboratory of Dryland Farming Agriculture, Ministry of Agriculture of the People's Republic of China (MOA), Beijing, 100081, PR China.
Wenqing
W
He
Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing, 100081, PR China.|Key Laboratory of Dryland Farming Agriculture, Ministry of Agriculture of the People's Republic of China (MOA), Beijing, 100081, PR China.
Qin
Q
Liu
Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing, 100081, PR China.|Key Laboratory of Dryland Farming Agriculture, Ministry of Agriculture of the People's Republic of China (MOA), Beijing, 100081, PR China.
Baoqing
B
Chen
D000383:Agriculture; D000465:Algorithms; D002244:Carbon / Q000032:analysis; D057486:Carbon Cycle; D002245:Carbon Dioxide / Q000032:analysis; D002681:China; D008962:Models, Theoretical; D012621:Seasons; D012987:Soil / Q000737:chemistry*; D014908:Triticum; D014887:Weather
D012987:Soil; D002245:Carbon Dioxide; D002244:Carbon