添加硫和锰对长白山森林土壤与腐殖质顽固性有机碳矿化的影响

doi:10.11707/j.1001-7488.20200802

Abstract

Abstract:

Objective: The objective of the study was to investigate the effects of sulfur (S) and manganese (Mn) addition on the mineralization of recalcitrant organiccarbon (C) and temperature sensitivity (Q₁₀) from forest soil and mor-humus collected from Changbai Mountains, northeastern China, in order to provide a basis for predicting the responses of biogeochemical cycling of carbon to atmospheric sulfur deposition. Method: Soil and mor-humus samples were collected from montane forests (broadleaved Korean pine and Betulaplatyphylla-Populusdavidiana mixed forest) and tundra, and then pre-incubated at 25℃ for 90-days toremovethe componentsof active carbonthat can be easily decomposed, followed by addition of 2 mL solutionsrespectivelyof MnCl₂, MnSO₄, NaCl, and Na₂SO₄, and addition of equivalent volumeofdouble distilled water to the control treatment, and further incubated at 25℃ and 35℃ for a 30-day period, respectively. Respired CO₂ was periodically measured at day 1, 3, 6, 10, 15, 21 and 30 during the 30 day's period, cumulative mineralization of recalcitrant organic carbon, recalcitrant organic carbon mineralization rate and associated Q₁₀ were calculated. Soil and mor-humus collected at the end of incubation experiment were used for measuring soil microbial biomass using phospholipid fatty acid(PLFA) method. Result: The recalcitrant organic carbon mineralization rate, cumulative mineralization of recalcitrant organic carbon and Q₁₀ were not significantly different between MnCl₂ and NaCl treatments, and betweenMnSO₄ and Na₂SO₄ treatments(P> 0.05). The addition of S rather than Mn affected the recalcitrant organic carbon mineralization rate. Mineralization rate of soil recalcitrant organic carbon under the MnSO₄ treatment were significantly higher than those of the Na₂SO₄ treatment(P < 0.05). MnSO₄ and Na₂SO₄ addition significantly increased the cumulative mineralization of recalcitrant organic carbon of the mor-humus samples from Betula platyphylla-Populus davidiana mixed forest and the three soil samples(P < 0.05), whereas the MnCl₂ and NaCl addition did not. The addition of Mn and S significantly decreased Q₁₀ of soils collected from broadleaved Korean pine forest (P < 0.05), but not those of soils from B. platyphylla-P. davidiana mixed forest and tundra. The addition of MnSO₄ significantly increased total PLFAs of the mor-humus collected from broadleaved Korean pine and B. platyphylla-P. davidiana mixed forest and total PLFAs increased after the addition of MnSO₄ solution, especially for the tundra soil. Conclusion: Our results highlighted an effect of S rather than Mn on the mineralization of soil recalcitrant organic carbon in Changbai Mountains. Hence, we suggest that more careful studies of the influence of sulfur on organic carbon mineralization are required to determine biogeochemical cycling of carbon from the ecosystem where atmospheric sulfur deposition is still not declining.

Key words: manganese addition, sulfur addition, recalcitrant carbon, decomposition, Q₁₀

CLC Number:

S718.5

Yuzhe Wang,Fengli Zhang,Xingbo Zheng,Shijie Han,Junqiang Zheng. Effects of Sulfur and Manganese Addition on Mineralization of Recalcitrant Organic Carbon of Forest Soil and Humus in Changbai Mountains[J]. Scientia Silvae Sinicae, 2020, 56(8): 11-19.

Figures/Tables 6

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项目 Item	植被类型 Vegetation type	全碳含量 Total C content(%)	全氮含量 Total N content(%)	砂粒含量 Sand content(%)	粉粒含量 Silt content(%)	黏粒含量 Clay content(%)
土壤 Soil	阔叶红松林Korean pine forest	13.06	0.64	65.61	18.94	15.35
	杨桦林P. davidiana- B. platyphylla mixed forest	10.03	0.66	61.43	21.52	17.05
	高山苔原Tundra	10.15	0.55	34.26	48.43	17.36
腐殖质 Mor-humus	阔叶红松林Korean pine forest	52.25	1.43	-	-	-
腐殖质 Mor-humus	杨桦林P. davidiana- B. platyphylla mixed forest	45.33	1.78	-	-	-

项目 Item	因素 Factor	顽固性有机碳矿化速率 Mineralization rate of recalcitrant organic carbon
		25 ℃		35 ℃
		F	P	F	P
腐殖质 Mor-humus	植被类型Vegetation type	0.624	0.445	0.51	0.489
	处理Treatment	3.802	0.053	2.037	0.173
	类型×处理Vegetation type×treatment	0.203	0.819	0.261	0.775
	时间Time	5 517.58	< 0.01	6 152.91	< 0.01
	时间×植被类型Time×vegetation type	1.532	0.168	6.344	< 0.01
	时间×处理Time×treatment	4.762	< 0.01	2.242	0.012
	时间×植被类型×处理Time×vegetation type×treatment	1.593	< 0.098	1.382	0.18
土壤 Soil	植被类型Vegetation type	22.906	< 0.01	11.662	< 0.01
	处理Treatment	19.605	< 0.01	29.153	< 0.01
	类型×处理Vegetation type×treatment	3.988	0.017	5.621	< 0.01
	时间Time	1 852.11	< 0.01	2 251.37	< 0.01
	时间×植被类型Time×vegetation type	6.995	< 0.01	21.76	< 0.01
	时间×处理Time×treatment	12.469	< 0.01	8.732	< 0.01
	时间×植被类型×处理Time×vegetation type×treatment	1.801	0.015	1.376	0.12

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Effects of Sulfur and Manganese Addition on Mineralization of Recalcitrant Organic Carbon of Forest Soil and Humus in Changbai Mountains

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