长期施氮对暖温带油松林土壤呼吸及其组分的影响

doi:10.11707/j.1001-7488.20210101

Abstract

Abstract:

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.

Key words: long-term nitrogen addition, Pinus tabulaeformis natural forest, autotrophic respiration, heterotrophic respiration, temperature sensitivity

CLC Number:

S718.56

Lu Yang,Jinsong Wang,Bo Zhao,Xiuhai Zhao. Effects of Long-Term Nitrogen Application on Soil Respiration and Its Components in Warm-Temperate Forest of Pinus tabulaeformis[J]. Scientia Silvae Sinicae, 2021, 57(1): 1-11.

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References 0

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处理 Treatment	林龄 Forest age/a	密度 Density/hm^-2	平均胸径 Mean DBH/cm	海拔 Elevation/m	土壤 pHSoil pH	有机碳含量 Orgnic carbon content/(g·kg^-1)	全氮含量 Total nitrogen content/(g·kg^-1)
CK	80	1 267	25.2	1 680	6.91	30.75	1.17
LN	80	1 567	24.6	1 680	6.79	31.57	1.37
MN	80	1 208	24.1	1 680	6.86	32.45	1.34
HN	80	1 225	23.9	1 680	6.61	29.04	1.35

项目 Item	df	土壤呼吸速率 Soil respirationrate	异养呼吸速率 Heterotrophic respirationrate	自养呼吸速率 Autotrophic respirationrate	切根 Trenched		不切根 Untrenched
项目 Item	df	土壤呼吸速率 Soil respirationrate	异养呼吸速率 Heterotrophic respirationrate	自养呼吸速率 Autotrophic respirationrate	温度 Temperature	湿度 Moisture	温度 Temperature	湿度 Moisture
月份Month	16	0.934	11.515^***	15.336^***	0.152	10.511^***	0.252	4.105^*
氮处理Nitrogen treatment	3	7.098^***	10.143^***	1.245	0.025	1.83	0.161	1.754
月份×氮处理Month×nitrogen treatment	48	4.658^***	11.726^***	6.986^***	0.075	5.425^***	0.196	2.733^*

模型 Model	参数 Parameter	自养呼吸速率Autotrophic respiration rate				异养呼吸速率Heterotrophic respiration rate
模型 Model	参数 Parameter	CK	LN	MN	HN	CK	LN	MN	HN
R=a₁e^b₁T	a₁	0.310	0.164	0.207	0.214	0.494	0.522	0.455	0.431
	b₁	0.078	0.107	0.105	0.085	0.100	0.080	0.075	0.082
	P	＜0.05	＜0.001	＜0.001	＜0.01	＜0.001	＜0.001	＜0.001	＜0.001
	R²	0.197	0.390	0.396	0.329	0.701	0.767	0.630	0.733
	Q₁₀	2.190	2.901	2.858	2.340	2.724	2.226	2.123	2.270
R=a₂+b₂W	a₂	0.858	1.266	1.546	0.168	2.626	1.673	1.681	2.673
	b₂	-0.001	-0.022	-0.029	0.018	-0.026	-0.007	-0.018	-0.048
	P	0.982	0.219	0.366	0.158	0.367	0.673	0.182	＜0.01
	R²	0.001	0.022	0.012	0.029	0.012	0.003	0.026	0.136
R=a₃e^b₃TW^c	a₃	1.661	0.509	4.301	0.008	0.219	0.254	0.222	0.362
	b₃	0.101	0.104	0.101	0.083	0.103	0.082	0.078	0.083
	c	-2.491	-0.333	-0.916	1.021	0.232	0.208	0.208	0.049
	P	＜0.05	＜0.001	＜0.001	＜0.01	＜0.001	＜0.001	＜0.001	＜0.001
	R²	0.287	0.420	0.374	0.399	0.716	0.781	0.649	0.745

项目Item	CK	LN	MN	HN
土壤pH Soil pH	6.36±0.20a	6.29±0.19ab	5.99±0.19ab	5.58±0.48b
土壤有机碳含量Soil organic carbon content/(g·kg ^-1)	32.59±4.01a	33.48±3.21a	37.02±3.99a	35.86±6.34a
土壤全氮含量Soil total nitrogen content/(g·kg ^-1)	1.61±0.21a	1.79±0.16a	2.01±0.08a	1.84±0.22a
土壤全磷含量Soil total phosphorus content/(g·kg ^-1)	0.27±0.08a	0.30±0.04a	0.33±0.07a	0.30±0.05a
土壤微生物生物量碳含量Soil microbial biomass carbon content/(mg·kg ^-1)	498.28±24.39a	442.08±14.62b	426.22±33.93b	425.02±17.34b
细根生物量Fine root biomass/(g·m ^-2)	85.88±7.60a	89.14±10.39a	88.33±9.67a	81.00±8.82a
凋落物氮含量Litter nitrogen content/(g·kg ^-1)	1.61±0.05a	1.61±0.07a	1.55±0.07a	1.44±0.09a
凋落物磷含量Litter phosphorus content/(g·kg ^-1)	0.22±0.02a	0.26±0.03a	0.27±0.02a	0.21±0.02a
细根氮含量Fine root nitrogen content/(g·kg ^-1)	1.38±0.26a	1.35±0.03a	1.80±0.12a	1.97±0.18a
细根磷含量Fine root phosphorus content/(g·kg ^-1)	2.73±0.10a	3.17±0.01a	3.07±0.27a	2.94±0.28a

项目Item	土壤呼吸速率Soil respiration rate	异养呼吸速率Heterotrophic respiration rate	自养呼吸速率Autotrophic respiration rate
土壤pH Soil pH	0.55	0.42	0.47
土壤有机碳含量Soil organic carbon content	0.32	0.01	0.52
土壤全氮含量Soil total nitrogen content	0.20	-0.19	0.57
土壤全磷含量Soil total phosphorus content	0.35	0.24	0.33
土壤微生物生物量碳含量Soil microbial biomass carbon content	0.79 ^**	0.78 ^**	0.45
细根生物量Fine root biomass	0.53	0.14	0.76 ^**
凋落物氮含量Litter nitrogen content	0.62 ^*	0.48	0.52
凋落物磷含量Litter phosphorus content	0.18	-0.13	0.44
细根氮含量Fine root nitrogen content	-0.21	-0.50	0.22
细根磷含量Fine root phosphorus content	-0.13	-0.20	0.01

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

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