Chinese Journal of Agrometeorology ›› 2018, Vol. 39 ›› Issue (09): 575-584.doi: 10.3969/j.issn.1000-6362.2018.09.003

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Effect of Biochar Addition on Soil Respiration of Oasis Farmland in Arid Areas

YAN Cui-xia, YANG Guo-liang, LI Dian-peng, SUN Yue-bing, HAN Dong-liang, XU Xiao-long, ZHU Xin-ping, JIA Hong-tao   

  1. 1. College of Grassland and Environment Sciences, Xinjiang Agricultural University/Xinjiang Key Laboratory of Soil and Plant Ecological Processes, Urumqi 830052, China;2. Key Laboratory of Original Environmental Quality,Agro-Environmental Protection Institute,Ministry of Agriculture,Tianjin 300191
  • Online:2018-09-20 Published:2018-09-13

Abstract: In this paper, authors investigated the influence of biochar addition with four different particle sizes of cotton stalks biochar and vine biochar (>5,1-5,0.25-1 and <0.25mm) on the changes of soil CO2 emission using the soil column incubation method in a grey desert soil. The results showed that: (1) addition with biochar soil respiration rate increased first and then decreased during the incubation period (0-85d), and the increase of soil respiration in the former 10d was higher than that in the late stage. The soil respiration rate (1.27μmol·m-2·s-1) under the biochar addition was higher than that of the not biochar addition control treatments (1.01μmol·m-2·s-1), and the soil respiration rate under cotton stalk biochar (1.43μmol·m-2·s-1) was higher than that of the grapevine biochar addition treatments (1.08μmol·m-2·s-1). The accumulation of soil CO2 emission accorded with the first-order reaction kinetics equation during the incubation period. Biochar addition changed the potential emissions, the turnover rate and half-life time of soil CO2. (2) The equations of linear regression between the two biochar treatments and the cumulative emission of CO2 were y=7.51x+88.53 and y=2.68x+75.85 (x was biochar particle diameter) for cotton stalks biochar and vine biochar, respectively. (3) Soil respiration rates under biochar addition were significantly correlated with air temperature and soil temperature. The correlation between soil respiration rate and temperature under cotton stalks biochar was higher than that of the grape vine biochar. The temperature sensitivity coefficient of CO2 emissions increased with the decrease in grain size. Considering the soil respiration rate and temperature sensitivity coefficient, we suggested that medium size biochar (1-5mm) should be applied in oasis farmland.

Key words: Xinjiang, Gray desert soil, Soil respiration, Cotton stalks biochar, Vine biochar