Abstract:In order to investigate the effects of simulated warming on the key processes of soil carbon and nitrogen cycling in a cropland, a randomized block experiment including two treatments (simulated warming and control) was carried out. Soil CO2 production rates, nitrification, denitrification were determined by using a barometric process separation method. Root biomass, dissolved organic carbon (DOC), nitrite, sulfate and nitrate were also measured. Under the winter wheat-soybean rotation, seasonal mean CO2 production rates for simulated warming and control treatments were 149.7 and 114.5μg/(kg·h), respectively. Seasonal mean nitrification rates for simulated warming and control treatments were 563.6 and 399.9μg/(kg·h), respectively. Seasonal mean denitrification rates for simulated warming and control treatments were 319.7 and 216.2μg/(kg·h), respectively. The result indicated that during both winter wheat and soybean growth seasons, simulated warming significantly induced soil CO2 production. The impact of simulated warming on soil CO2 production rates was particularly obvious during the later growth period for both winter wheat and soybean. Simulated warming significantly increased soil nitrification and denitrification during the winter wheat-soybean rotation period; a more obvious effect can be found in summer. Simulated warming did not affect root biomass, DOC, nitrite, sulfate and nitrate content.
刘艳, 陈书涛, 刘燕, 高慧, 安俊宝, 甄晓龙, 李宏娜, 汪萌. 增温对农田土壤碳氮循环关键过程的影响[J]. 中国环境科学, 2013, 33(4): 674-679.
LIU Yan, CHEN Shu-Tao, LIU Yan, GAO Hui, AN Jun-Bao, ZHEN Xiao-Long, LI Hong-Na, WANG Meng. Effects of simulated warming on the key processes of soil carbon and nitrogen cycling in a cropland. CHINA ENVIRONMENTAL SCIENCECE, 2013, 33(4): 674-679.