Effects of long-term fertilization on soil respiration and carbon balance in spring corn fields
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DOI:10.7606/j.issn.1000-7601.2019.02.16
Key Words: spring corn  fertilization mode  CO2 emission  carbon balance  long-term positioning test
Author NameAffiliation
CHENG Wan-li Dryland Agriculture Institute, Gansu Academy of Agricultural Sciences/ Key Laboratory of Efficient Water Utilization in Dryland Farming of Gansu Province, Lanzhou, Gansu 730070, China 
LEI Kang-ning College of Agronomy, Gansu Agricultural University, Lanzhou, Gansu 730070, China 
WANG Shu-ying Dryland Agriculture Institute, Gansu Academy of Agricultural Sciences/ Key Laboratory of Efficient Water Utilization in Dryland Farming of Gansu Province, Lanzhou, Gansu 730070, China 
LI Li-li Pingliang Academy of Agricultural Sciences, Pingliang, Gansu 744500, China 
FAN Ting-lu Dryland Agriculture Institute, Gansu Academy of Agricultural Sciences/ Key Laboratory of Efficient Water Utilization in Dryland Farming of Gansu Province, Lanzhou, Gansu 730070, China 
LI Shang-zhong Dryland Agriculture Institute, Gansu Academy of Agricultural Sciences/ Key Laboratory of Efficient Water Utilization in Dryland Farming of Gansu Province, Lanzhou, Gansu 730070, China 
ZHAO Gang Dryland Agriculture Institute, Gansu Academy of Agricultural Sciences/ Key Laboratory of Efficient Water Utilization in Dryland Farming of Gansu Province, Lanzhou, Gansu 730070, China 
ZHANG Jian-jun Dryland Agriculture Institute, Gansu Academy of Agricultural Sciences/ Key Laboratory of Efficient Water Utilization in Dryland Farming of Gansu Province, Lanzhou, Gansu 730070, China 
TANG Xiao-ming Dryland Agriculture Institute, Gansu Academy of Agricultural Sciences/ Key Laboratory of Efficient Water Utilization in Dryland Farming of Gansu Province, Lanzhou, Gansu 730070, China 
DANG Yi Dryland Agriculture Institute, Gansu Academy of Agricultural Sciences/ Key Laboratory of Efficient Water Utilization in Dryland Farming of Gansu Province, Lanzhou, Gansu 730070, China 
WANG Lei Dryland Agriculture Institute, Gansu Academy of Agricultural Sciences/ Key Laboratory of Efficient Water Utilization in Dryland Farming of Gansu Province, Lanzhou, Gansu 730070, China 
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Abstract:
      A field experiment was carried out to explore fertilization effects on soil CO2 emission, relative contribution of root and soil respiration and carbon balance, and carbon respiration intensity during the period of spring corn jointing to maturity. The effects of different fertilizer applications: straw and chemical fertilizer (SNP), manure and chemical fertilizer (MNP), single manure (M), nitrogen and phosphorus fertilizer (NP), single nitrogen fertilizer(N), and no fertilizer (CK) on soil respiration were analyzed based on long-term fertilization experiment of 39 years. The results showed that soil CO2 emission was significantly affected by different fertilization techniques. It showed a considerable fluctuation with the growth stages, which was in hoisting until reached the peak in anthesis and dropping during the following period. The CO2 emission of SNP, MNP and N was 3 650.54, 2 980.50 mg·m-2·h-1 and 2 167.61 mg·m-2·h-1,respectively. Compared with CK, the increases were 340.32%, 259.51% and 161.45% for SNP, MNP and N, respectively. The order of average soil CO2 emission rates were SNP>MNP>M>NP>N>CK. The contribution ratio of rhizosphere respiration to total soil CO2 emission was fluctuated from 31% to 77%. Therefore, soils were sinks of atmosphere CO2 under all fertilization, but impact intensity on the carbon sink varied and in an order of SNP>M>MNP>NP>N>CK.