湿地松人工林土壤呼吸及其组分对模拟酸雨的响应

doi:10.11707/j.1001-7488.20210703

Abstract

Abstract:

Objective: The study was aimed to investigate the patterns of impacts of acid rain at different intensities on total soil respiration rate(R_s) and its components of soil heterotrophic respiration rate(R_h) and soil autotrophic respiration rate(R_a) in Pinus elliottii plantation, in order to improve our understandings of the process of soil respiration and further to provide a scientific basis for forest management under environmental stresses such as acid deposition. Method: We conducted a one-way factorial acid rain addition(CK: pH 6.5; low acid addition level(LA): pH 4.5; high acid addition(HA): pH 2.5, with 3 replicates) field experiment in a subtropical P. elliottii plantation in China. The trenching method was used to separate the heterotrophic and autotrophic soil respiration. From January to December of 2015, the R_s, R_a, R_h effluxes were measured twice a month using a LI-8100A automated soil CO₂ flux system. Soil temperatures and soil volumetric water content and soil biochemical properties adjacent to each soil respiration points were simultaneously detected. Result: R_s, R_a, R_h showed clear seasonal dynamics with similar single peak curves in all treatments, and were mainly driven by the surface soil temperature. Compared to the R_s under CK, the R_s under LA and HA were significantly reduced by 25.83% and 30.95%(P < 0.05). Also, LA and HA treatments inhibited the R_h effluxes by 29.60% and 35.20%(P < 0.05), reduced the R_a effluxes by 19.15% and 23.40%(P < 0.05). The inhibitory effect of simulated acid addition on soil respiration rates only showed in the growing season. R_a even being promoted in non-growth season(P < 0.05). In the CK plots, R_h accounted for 63.94% in R_s, and the proportion was significantly reduced(P < 0.05) in the LA and HA treatments. The intensity of R_a increased with the enhancement of acid rain. There were significant exponential correlations between R_s, R_h, R_a and soil temperature(P < 0.01), and both addition levels of the simulated acid rain could reduce the temperature sensitivity coefficient of soil respiration. Surface soil moisture was significantly related to the total soil respiration rates and the two main components under HA treatments(P < 0.01). The combined action of soil temperature and soil moisture also had a significant impact on soi respiration(P < 0.01). The variation of R_h was mainly controlled by the activity of soil urease and soil sucrase, topsoil organic carbon(TOC) and soil pH, while the R_a rates were mainly influenced by the soil urease activity, soil temperature and TOC, and the these factors jointly contributed 83.9% to the variation of R_s. Conclusion: The seasonal characteristics of soil respiration and its main components were similar and mainly controlled by surface soil temperature. Simulated acid rain exacerbated soil acidification, and significantly changed soil enzymes and soil organic carbon, which caused the inhibitory effects of R_s mainly due to R_h and R_a, and the changes of soil hydrothermal status induced the inhibition effects more obvious in the growing season. The proportion of R_h in the total soil respiration decreased with the increase of simulated acid rain intensities, but in the short term, the R_s variation was mainly controlled by the change of R_h.

Key words: soil respiration, simulated acid rain, influence mechanism, components of soil respiration, Pinus elliottii plantation

CLC Number:

S718.5

Huanying Fang,Shengsheng Xiao,Xiaofang Yu,Yong Xiong,Xunzhi Ouyang,Xiaolei Qin. Responses of Soil Respiration and Its Components to Simulated Acid Rain in Pinus elliottii Plantation[J]. Scientia Silvae Sinicae, 2021, 57(7): 20-31.

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References 0

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土壤呼吸速率 Soil respiration rate	处理 Treatment	土壤温度Soil temperature				土壤湿度Soil moisture			双因子Double factors
土壤呼吸速率 Soil respiration rate	处理 Treatment	拟合模型 Fitted model	R²	AIC	Q₁₀	拟合模型 Fitted model	R²	AIC	拟合模型 Fitted model	R²	AIC
R_s	CK	R_s = 1.270 8 e^{0.062 1 T}	0.746 2^**	-120.09	1.86	R_s =-103.86W² +20.795W + 3.746 1	0.314 8	13.53	R_s =1.442 e^0.064^TW^0.075	0.734^**	-118.27
	LA	R_s = 1.129 4 e^{0.052 2 T}	0.893 3^**	-179.41	1.69	R_s =-155.8W² + 33.942W + 1.411 9	0.233 6	-19.90	R_s =1.181 e^0.053^TW^-0.027	0.888^**	-177.32
	HA	R_s = 0.995 1 e^{0.055 4 T}	0.844 9^**	-157.59	1.74	R_s = 138.84W²-53.464W +7.507 1	0.264 6^**	-22.14	R_s =0.913 e^0.054^TW^-0.058	0.838^**	-155.94
R_h	CK	R_h = 0.935 1 e^{0.054 8 T}	0.736 3^**	-128.01	1.73	R_h =-58.294W² + 12.011W + 2.351 1	0.274 5	-27.63	R_h =1.107 e^0.058^TW^-0.131	0.727^**	-126.78
	LA	R_h = 0.677 9 e^{0.0525 T}	0.779 2^**	-144.28	1.69	R_h =-96.248W² + 21.417W + 0.774 9	0.193 2	-52.82	R_h =0.782 e^0.054^TW^0.086	0.770^**	-142.73
	HA	R_h = 0.761 7 e^{0.042 1 T}	0.718 1^**	-149.13	1.52	R_h = 60.3W²-22.677W + 3.616 7	0.164 7^**	-72.78	R_h =0.791 e^0.043^TW^0.025	0.703^**	-147.22
R_a	CK	R_a = 0.342 4 e^{0.076 8 T}	0.719 6^**	-97.68	2.16	R_a =-45.57W² + 8.784 2W + 1.395 0	0.356 3	-56.47	R_a =0.324 e^0.076^TW^-0.043	0.705^**	-95.70
	LA	R_a = 0.446 4 e^{0.051 2 T}	0.699 2^**	-129.64	1.67	R_a =-59.547W² + 12.525W + 0.637 1	0.191 9	-80.62	R_a =0.410 e^0.050^TW^--0.051	0.684^**	-127.67
	HA	R_a = 0.265 8 e^{0.076 3 T}	0.827 8^**	-127.34	2.14	R_a = 78.54W²-30.787W + 3.890 4	0.310 0^**	-70.75	R_a =0.203 e^0.073^TW^-0.181	0.828^**	-127.05

土层 Soil layer	土壤呼吸速率 Soil respiration ratio	R_s	pH	TOC	DOC	DON	NH₄⁺	NO₃^-	MBC	MBN	脲酶活性 Urease activity	蔗糖酶活性 Sucrase activity
0~5 cm	R_s	1.000	0.184	-0.362	-0.433^*	-0.377	-0.442^*	-0.672^**	-0.189	-0.119	0.869^**	0.810^**
	R_h	0.984^**	0.199	-0.308	-0.403	-0.37	-0.421^*	-0.629^**	-0.161	-0.106	0.834^**	0.778^**
	R_a	0.964^**	0.150	-0.412^*	-0.445^*	-0.362	-0.441^*	-0.688^**	-0.215	-0.130	0.859^**	0.801^**
5~10 cm	R_s	1.000	0.432	-0.281	-0.331	-0.202	-0.538^**	-0.067	-0.053	0.254	0.835^**	0.792^**
	R_h	0.984^**	0.513^*	-0.220	-0.291	-0.182	-0.519^**	0.051	0.033	0.341	0.804^**	0.765^**
	R_a	0.964^**	0.286	-0.348	-0.363	-0.216	-0.528^**	-0.225	-0.168	0.116	0.823^**	0.776^**

参数 Parameter	R_s				R_h				R_a
参数 Parameter	系数 Coefficient	误差 Error	t	Sig.	系数 Coefficient	误差 Error	t	Sig.	系数 Coefficient	误差 Error	t	Sig.
常量Constant	-3.584	1.480	-2.423	0.022	-2.793	1.099	-2.541	0.016	0.107	0.126	0.850	0.402
脲酶活性 Soil urease activity/(mg·g^-1)	5.879	1.842	3.191	0.003	3.317	1.307	2.539	0.016	3.419	0.515	6.637	0
土壤温度 Soil temperature/℃	0.044	0.024	1.804	0.081					0.040	0.007	5.545	0
TOC/(g·kg^-1)	-0.050	0.011	-4.551	0	-0.037	0.007	-5.052	0	-0.010	0.003	-3.415	0.002
pH	0.894	0.275	3.251	0.003	0.730	0.205	3.561	0.001
蔗糖酶活性 Soil sucrose activity/ (mg·g^-1)	0.045	0.019	2.326	0.027	0.040	0.013	3.070	0.004

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Responses of Soil Respiration and Its Components to Simulated Acid Rain in Pinus elliottii Plantation

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