JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2024, Vol. 48 ›› Issue (1): 140-146.doi: 10.12302/j.issn.1000-2006.202204011

Previous Articles     Next Articles

Effects of C, N and P additions on soil respiration in woodland under Cd stress

SUN Jinwei1(), WANG Shengyan1, FAN Diwu1, ZHU Yongli1,2,3,*()   

  1. 1. College of Ecology and Environment, Nanjing Forestry University, Nanjing 210037,China
    2. Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210037, China
    3. National Positioning Observation Station of Hung-tse Lake Wetland Ecosystem in Jiangsu Province, Hongze 223100, China
  • Received:2022-04-07 Revised:2022-06-16 Online:2024-01-30 Published:2024-01-24
  • Contact: ZHU Yongli E-mail:635914827@qq.com;lyly2011@126.com

Abstract:

【Objective】 Artificial standard soil was used to investigate the potential stimulatory effects of low-dose C, N, and P additions on soil respiration and Hormesis under heavy metal stress. 【Method】The four treatments were: GC (glucose), NP (nitrogen and phosphorus), GC+NP (glucose, nitrogen and phosphorus), and, no additions (CK). The soil samples were inoculated with soil microorganisms from forest land to determine the potential Hormesis effect of exogenous addition of glucose, N and P on soil respiration under Cd stress. 【Result】In the case of the NP and GC+NP treatments, the soil respiration rate was significantly higher than that of the control at Cd doses of 0.02, 0.10, 0.40, 2.50, and 13.00 mg/kg, respectively. There was a significant alternating phenomenon of multiple hormetic effects with stimulation amplitudes between 66.6% and 262.6%. When there was no Cd added to the soil, the sum of the soil respiration rates in the GC and NP treatments was greater than that in the GC+NP treatment. The interaction between C source and NP addition on soil respiration showed an antagonistic effect. When the Cd dose was 0.01 to 0.20 mg/kg, the sum of soil respiration rates in GC and NP treatments was lower than the corresponding rates in GC+NP treatments, and the effects of C source and NP additions on soil respiration showed a synergistic effect. Synergistic and antagonistic effects appeared alternately when the Cd dose was over 0.20 mg/kg. 【Conclusion】The Cd-induced soil respiration rate had a significant Hormesis effect under exogenous NP addition. With increasing Cd stress, the interaction between the C source and NP addition on soil respiration changed from antagonistic to synergistic effects.

Key words: soil respiration, cadmium stress, hormesis, artificial standard soil, glucose, nitrogen and phosphorus addition

CLC Number: