Effects of Long-Term Nitrogen Application on Soil Respiration and Its Components in Warm-Temperate Forest of Pinus tabulaeformis

被引：0
|
作者：
Yang L. [1 ,2 ]
Wang J. [2 ]
Zhao B. [1 ]
Zhao X. [1 ]
机构：
[1] Research Center of Forest Management Engineering of National Forestry and Grassland Administration, Beijing Forestry University, Beijing
[2] Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing
来源：
Linye Kexue/Scientia Silvae Sinicae | 2021年 / 57卷 / 01期
关键词：
Autotrophic respiration; Heterotrophic respiration; Long-term nitrogen addition; Pinus tabulaeformis natural forest; Temperature sensitivity;
D O I：
10.11707/j.1001-7488.20210101
中图分类号：
学科分类号：
摘要：
Objective: The objective was to explore the differences of soil respiration and its components among different levels of nitrogen addition of the natural forest of Pinus tabulaeformis under long-term nitrogen enrichment, to reveal the main influencing factors of the changes in the respiration of soil components, and to provide a scientific basis for evaluating the effect of long-term nitrogen application on soil respiration in regional forests. Method: We conducted a 10-year nitrogen addition experiment (2009-2018) in a P. tabulaeformis forest in Taiyue Mountain, Shanxi Province, with four levels of nitrogen addition including control (CK, 0 kg N•hm-2 a-1), low nitrogen (LN, 50 kg N•hm-2 a-1), medium nitrogen (100 kg N•hm-2a-1), and high nitrogen (HN, 150 kg N•hm-2 a-1). Soil respiration and its components were measured monthly in growing seasons from 2016-2018. Result: Mean annual soil respiration rate was significantly decreased by 21.9%, 27.3%, and 29.1%; and mean annual heterotrophic respiration rate was significantly reduced by 21.8%, 36.6%, 31.4% under LN, MN and HN, respectively, compared with the control. Long-term nitrogen addition had no significant effect on soil autotrophic respiration rate. Meanwhile, soil pH and soil microbial biomass carbon were significantly decreased by 0.07, 0.37, 0.78 units and 11.3%, 14.5%, 14.7% under LN, MN and HN, respectively relative to the control. However, soil organic carbon, total nitrogen and fine root biomass were not altered by nitrogen enrichment. There was a significant linear relationship between heterotrophic respiration and soil microbial biomass carbon; autotrophic respiration also exhibited a significant linear correlation with fine root biomass. The long-term nitrogen addition significantly increased temperature sensitivity(Q10) of soil autotrophic respiration (CK=2.19, LN=2.90, MN=2.86, HN=2.34), but decreased the Q10 values of soil heterotrophic respiration (CK=2.72, LN=2.23, MN=2.12, HN=2.27). Soil respiration were not correlated with soil moisture (P>0.05). In addition, two-factor models combining soil temperature and soil moisture explained 28.7%-42.0% (P<0.05) and 64.9%-78.1% (P<0.001) of the autotrophic respiration and heterotrophic respiration, respectively. Conclusion: Long-term nitrogen addition reduced soil respiration by the nitrogen-induced decrease in the heterotrophic respiration, but had no significant effect on autotrophic respiration rate. In addition, changes in respiratory substrates were the main factors for the inconsistent effects of chronic nitrogen application on the Q10 values of autotrophic and heterotrophic respiration. Our study highlights that fine root biomass and respiration substrate should be incorporated into future models when accurately predicting chronic nitrogen addition effect on soil respiration and its components. © 2021, Editorial Department of Scientia Silvae Sinicae. All right reserved.
引用
下载
收藏
页码：1 / 11
页数：10
相关论文
共 54 条
  • [1] Chang J G, Liu S R, Shi Z M, Et al., Response of soil respiration to soil temperature and moisture regimes in the natural forest of Quercus aliena var. acuteserrata, Scientia Silvae Sinicae, 42, 12, pp. 21-27, (2006)
  • [2] Chen P, Zhao B, Yan Z C, Et al., Short-term response of soil respiration to simulated nitrogen deposition in a Pinus tabulaeformis plantation on Taiyue Mountain, China, Acta Ecological Sinica, 38, 22, pp. 8184-8193, (2018)
  • [3] Fan Z Z, Wang X, Wang C, Et al., Effect of nitrogen and phosphorus addition on soil enzyme activities: a meta-analysis, Chinese Journal of Applied Ecology, 29, 4, pp. 1266-1272, (2018)
  • [4] Li H S, Wang J S, Zhao X H, Et al., Effects of litter removal on soil respiration under simulated nitrogen deposition in a Pinus tabulaeformis forest in Taiyue Mountain, China, Chinese Journal of Ecology, 33, 4, pp. 857-866, (2014)
  • [5] Liu C X, Jiao R Z, Dong Y H, Et al., Effect of nitrogen deposition on soil microbial community structure determined with the PLFA method, Scientia Silvae Sinicae, 51, 6, pp. 155-162, (2015)
  • [6] Liu X, Wang J S, Zhao X H., Effects of simulated nitrogen deposition on the soil enzyme activities in a Pinus tabulaeformis forest at the Taiyue Mountain, Acta Ecological Sinica, 35, 14, pp. 4613-4624, (2015)
  • [7] Liu X Y, Du E Z, Xu L C, Et al., Response of tree growth to nitrogen addition in a Larix gmelinii primitive forest, Chinese Journal of Plant Ecology, 39, 5, pp. 433-441, (2015)
  • [8] Wang J S, Fan J, Zhao X H, Et al., Soil respiration components and its controlling factors in a Pinus tabulaeformis plantation in Taiyue Mountain, China, Scientia Silvae Sinicae, 49, 2, pp. 1-7, (2013)
  • [9] Wang J S, Zhao X H, Zhang C Y, Et al., Changes of carbon input influence soil respiration in a Pinus tabulaeformis plantation, Acta Ecological Sinica, 32, 9, pp. 2768-2777, (2012)
  • [10] Yang L, Zhao B, Chen P, Et al., Effects of long-term nitrogen addition on litter production of Pinus tabuliformis forests in the Taiyue Mountain, Chinese Journal of Ecology, 37, 12, pp. 3516-3524, (2018)
123456