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Scientia Silvae Sinicae ›› 2023, Vol. 59 ›› Issue (7): 54-64.doi: 10.11707/j.1001-7488.LYKX20210943

• Research papers • Previous Articles     Next Articles

Asymmetric Response of Soil Respiration and Its Components to Nitrogen and Phosphorus Addition in Phyllostachys edulis Forest

Yi Wang1,2(),Junwei Luan1,Chen Chen3,Shirong Liu4,*   

  1. 1. Key Laboratory of Bamboo and Rattan Science and Technology, International Centre for Bamboo and Rattan Beijing 100102
    2. Changning Bamboo Forest Ecosystem Research Station, Sichuan Province Yibin 644000
    3. College of Agriculture, Sichuan Agricultural University Chengdu 611130
    4. Ecology and Nature Conservation Institute, Chinese Academy of Forestry Beijing 100091
  • Received:2021-12-26 Online:2023-07-25 Published:2023-09-08
  • Contact: Shirong Liu E-mail:wangyi@icbr.ac.cn

Abstract:

Objective: In this study, a field experiment was set up to explore the response of soil respiration rates (R) and its components to nitrogen (N), phosphorus (P) addition and their interaction, and this study aimed to reveal the role of biotic and abiotic factors in regulating R and provide a scientific basis for the carbon cycling and model prediction of nutrient addition in Phyllostachys edulis forest ecosystem. Method: Nitrogen and phosphorus were added every two months by spraying them under the canopy in a phosphorus deficient bamboo forest from June 2017. Four treatments were conducted, including control(CK), nitrogen addition(N), phosphorus addition(P) and nitrogen and phosphorus addition together(N + P). Soil total respiration rates and soil heterotrophic respiration rates were measured with Li-8100 from September 2017 to August 2018. At the same time, the soil temperature (T), soil moisture (SM), fine root and soil properties, fine root biomass and soil microbial properties were measured. Result: Both nitrogen and phosphorus addition did not significantly change fine root biomass of Ph. edulis, and thus had no significant impact on soil autotrophic respiration rate. However, nitrogen and phosphorus addition significantly decreased soil heterotrophic respiration rate , which were attributed to the increment of soil availability nitrogen content by nitrogen addition and decline of ratio of fungi biomass to bacteria biomass by phosphorus, respectively. The nitrogen and phosphorus addition had significant interactive effect on soil autotrophic and heterotrophic respiration rates. The phosphorus addition significantly increased the soil total respiration rate, while N addition as well as interactive effect of N addition and P addition did not significantly affect the soil total respiration rate. The model (R = aebT × SMc) was able to explain the synergistic variation of T and SM in regulating R. P treatment reduced the determined coefficient of T and SM in regulating R. N, P and N + P treatments significantly reduced temperature sensitivity of soil total respiration(CK = 2.64, N = 2.54, P = 2.10, N + P = 2.39)and soil heterotrophic respiration(CK = 2.32, N = 2.03, P = 1.94, N + P = 1.75), but increased temperature sensitivity of soil autotrophic respiration (CK = 2.80, N = 2.95, P = 2.44, N + P = 4.35). Conclusion: The soil autotrophic respiration and heterotrophic respiration of phosphorus deficient Ph. edulis forest have asymmetrical responses to N and P addition and their interaction, and the different responses to nutrient addition should be fully considered when predicting soil carbon emission of P deficient Ph. edulis forest in the future.

Key words: Phyllostachys edulis, soil autotrophic respiration, soil heterotrophic respiration, N and P addition, asymmetric response

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