• 研究报告 •

### 模拟增温对东北黑土农田作物生长季土壤呼吸的影响

1. 1中国科学院东北地理与农业生态研究所黑土区农业生态院重点实验室， 哈尔滨 150081； 2中国气象局气象干部培训学院， 北京 100081）
• 出版日期:2017-03-10 发布日期:2017-03-10

### Effects of experimental warming on soil respiration during growing period in cropland in the black soil region of Northeast China.

FU Wei1, ZHANG Xing-yi1*, ZHAO Jun1, DU Shu-li1, HOU Mei-ting2#br#

1. (1Key Laboratory of Mollisols Agroecology, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Harbin 150081, China; 2China Meteorological Administration Training Centre, Beijing 100081, China).
• Online:2017-03-10 Published:2017-03-10

Abstract: Northeast China is more sensitive to climate change than the other areas in China. The temperature sensitivity of soil respiration has dramatic effects on the feedback between carbon cycle of agroecosystem in Northeast China and global warming. Infrared radiators were used to simulate soil warming to investigate the response of soil respiration during the growing period to the experimental warming. The experimental warming significantly increased the mean soil temperature at the depth of 10 cm by 2.76 ℃ during the whole experimental period. Soil respiration rate showed an obvious seasonal variation with a peak at flowering and podbearing stage. The average soil respiration rate was slightly higher in the warmed plots (3.20 μmol·m-2·s-1) than in the control plots (2.96 μmol·m-2·s-1). However, the statistical analysis indicated that the experimental warming had no significant effects on the soil respiration rate. The experimental warming significantly increased the aboveground biomass but had no effects on the root biomass and soil water content. These results indicated that root biomass and soil water content were the main factors regulating the response of soil respiration to warming. We concluded that soil respiration in the twoyear experimental warming could not significantly accelerate soil respiration during the growing period, suggesting that the cropland may be prone to acclimate to experimental warming in the black soil region of Northeast China.