
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.
Effects of C, N and P additions on soil respiration in woodland under Cd stress
【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.
soil respiration / cadmium stress / hormesis / artificial standard soil / glucose / nitrogen and phosphorus addition
[1] |
|
[2] |
|
[3] |
|
[4] |
|
[5] |
|
[6] |
|
[7] |
|
[8] |
|
[9] |
|
[10] |
|
[11] |
|
[12] |
|
[13] |
|
[14] |
|
[15] |
|
[16] |
|
[17] |
|
[18] |
|
[19] |
Ministry of the Environment, Government of Japan. Environmental quality standards for soil pollution[S].[2022-04-18]. www.env.go.jp/en/water/soil/sp.html, 2011.
|
[20] |
王国庆, 邓绍坡, 冯艳红, 等. 国内外重金属土壤环境标准值比较:镉[J]. 生态与农村环境学报, 2015, 31(6):808-821.
|
[21] |
王小庆, 马义兵, 黄占斌. 痕量金属元素土壤环境质量基准研究进展[J]. 土壤通报, 2013, 44(2):505-512.
|
[22] |
USEPA United States Environmental Protection Agency. Ecological soil screening levels[R/OL]. [2022-04-18]. http://www.epa.gov/ecotox/ecossl, 2011.
|
[23] |
|
[24] |
|
[25] |
|
[26] |
|
[27] |
周涵君, 于晓娜, 秦燚鹤, 等. 施用生物炭对Cd污染土壤生物学特性及土壤呼吸速率的影响[J]. 中国烟草学报, 2017, 23(6):61-68.
|
[28] |
|
[29] |
|
[30] |
|
[31] |
|
[32] |
|
[33] |
|
[34] |
|
[35] |
|
[36] |
|
[37] |
|
[38] |
|
/
〈 |
|
〉 |