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

SUN Jinwei, WANG Shengyan, FAN Diwu, ZHU Yongli

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2024, Vol. 48 ›› Issue (1) : 140-146.

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

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

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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

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SUN Jinwei , WANG Shengyan , FAN Diwu , et al. Effects of C, N and P additions on soil respiration in woodland under Cd stress[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY. 2024, 48(1): 140-146 https://doi.org/10.12302/j.issn.1000-2006.202204011

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