Characteristics of Soil Nitrogen Components of Original Tilia Pinus Koraiensis Forest and Secondary Poplar-Birch Forest in Lesser Khingan Mountains

doi:10.11924/j.issn.1000-6850.casb2021-0868

Abstract

Abstract:

To evaluate the effects of the different forests on soil nitrogen pool, the study was conducted to detect the characteristics of soil nitrogen components of Tilia Pinus Koraiensis forest in different periods and secondary poplar-birch forest in Lesser Khingan Mountains. Tilia Pinus Koraiensis forest in different periods and secondary poplar-birch forest were taken as the study objects, and soil samples were analyzed for the physical and chemical properties including soil bulk density, total organic carbon, total nitrogen, total phosphorus, available nitrogen, nitric nitrogen, ammonium nitrogen and etc. The results showed that the content of total nitrogen, available nitrogen, ammonium nitrogen and nitrate nitrogen all decreased with the deepening of the soil layer. In the same soil layer of different forest types, soil total nitrogen content and nitrate nitrogen content between mature forest and young forest of Tilia Pinus Koraiensis were significantly different (P<0.05), but there was no significant difference between Tilia Pinus Koraiensis forest in the two periods and secondary poplar-birch forest. Total soil nitrogen had extremely and significantly positive correlation with ammonium nitrogen and porosity (P<0.01), and significant correlation with total organic carbon and available nitrogen (P<0.05). Soil nitrate nitrogen had extremely and significantly positive correlation with available nitrogen and porosity (P<0.01), significant correlation with the present stocking amount of litter (P<0.05), but extremely and significantly negative correlation with moisture content (P<0.01). Ammonium nitrogen had extremely and significantly positive correlation with total nitrogen and porosity (P<0.01). Available nitrogen had extremely and significantly positive correlation with porosity (P<0.01), significantly positive correlation with total nitrogen (P<0.05), but no correlation with other indicators. Among different nitrogen components, available nitrogen and nitrate nitrogen were the dominant types, which had more significant effects on soil organic carbon and forest growth. The contribution of the ground litter to carbon and nitrogen was usually delayed for some reasons, and the differences of soil nitrogen components of the three forest types were the result of the combined effects of many factors such as soil physical and chemical properties, forest litter, soil environment and so on.

Key words: Tilia Pinus Koraiensis forest, secondary poplar-birch forest, nitrogen components, difference, correlation

CLC Number:

DIAO Yunfei, ZHANG Su, CONG Xidong, DU Qian, WANG Qiyao, LIU Xue. Characteristics of Soil Nitrogen Components of Original Tilia Pinus Koraiensis Forest and Secondary Poplar-Birch Forest in Lesser Khingan Mountains[J]. Chinese Agricultural Science Bulletin, 2022, 38(26): 69-75.

Figures/Tables 5

References 28

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林型	海拔/m	坡度/°	坡位	坡向	平均胸径/cm	郁闭度/%
中幼龄林	400±83	20±2	中坡	南	14.9.0±2.02	80±5
成熟林	406±50	12±3	中坡	西南	23.06±5.00	75±5
杨桦林	316±22	15±2	中坡	南	17.4±2.32	85±5

林型	海拔/m	坡度/°	坡位	坡向	平均胸径/cm	郁闭度/%
中幼龄林	400±83	20±2	中坡	南	14.9.0±2.02	80±5
成熟林	406±50	12±3	中坡	西南	23.06±5.00	75±5
杨桦林	316±22	15±2	中坡	南	17.4±2.32	85±5

林型	土层深度	全氮/(g/kg)	速效氮/(mg/kg)	硝态氮/(mg/kg)	铵态氮/(mg/kg)
红松林成熟林	0~10	6.36±0.55 Ba	201.13±13.32 Aa	77.89±12.71 Ba	78.55±13.47 Aa
	10~20	3.52±0.15 Bb	138.08±23.97 Aa	60.19±7.85 Bb	61.23±6.13 Aa
	20~30	2.46±0.24 Bb	115.62±22.26 Aa	40.98±5.67 Bb	59.38±6.09 Aa
红松林中幼龄林	0~10	9.11±0.42 Aa	258.42±38.68 Aa	64.03±0.76 Ba	102.44±7.29 Aa
	10~20	4.75±0.45 Ab	136.5±13.74 Aa	45.63±1.76 Bb	68.33±23.9 Aa
	20~30	3.08±0.39 Ab	120.87±21.62 Aa	35.36±2.76 Bb	48.49±14.32 Aa
次生杨桦林	0~10	8.13±0.76 ABa	273.11±43.5 Aa	75.19±4.74 Aa	91.22±17.23 Aa
	10~20	4.37±1.76 ABb	163.35±15.89 Aa	52.81±2.79 Ab	76.95±18.55 Aa
	20~30	3.40±1.70 ABb	143.97±43.17 Aa	43.97±2.99 Ab	67.59±18.36 Aa

林型	土层深度	全氮/(g/kg)	速效氮/(mg/kg)	硝态氮/(mg/kg)	铵态氮/(mg/kg)
红松林成熟林	0~10	6.36±0.55 Ba	201.13±13.32 Aa	77.89±12.71 Ba	78.55±13.47 Aa
	10~20	3.52±0.15 Bb	138.08±23.97 Aa	60.19±7.85 Bb	61.23±6.13 Aa
	20~30	2.46±0.24 Bb	115.62±22.26 Aa	40.98±5.67 Bb	59.38±6.09 Aa
红松林中幼龄林	0~10	9.11±0.42 Aa	258.42±38.68 Aa	64.03±0.76 Ba	102.44±7.29 Aa
	10~20	4.75±0.45 Ab	136.5±13.74 Aa	45.63±1.76 Bb	68.33±23.9 Aa
	20~30	3.08±0.39 Ab	120.87±21.62 Aa	35.36±2.76 Bb	48.49±14.32 Aa
次生杨桦林	0~10	8.13±0.76 ABa	273.11±43.5 Aa	75.19±4.74 Aa	91.22±17.23 Aa
	10~20	4.37±1.76 ABb	163.35±15.89 Aa	52.81±2.79 Ab	76.95±18.55 Aa
	20~30	3.40±1.70 ABb	143.97±43.17 Aa	43.97±2.99 Ab	67.59±18.36 Aa

土壤性质		有机碳		全磷
有机碳		1
全磷		0.553^**		1
全氮	0.443^*		-0.151		1
硝态氮	0.752^**		0.493^**		0.267	1
铵态氮	0.207		-0.047		0.500^*	0.160	1
速效氮	0.828^**		0.350		0.471^*	0.574^**	0.260	1
凋落物	0.316		-0.034		-0.041	0.420^*	0.006	-0.378	1
含水率	-0.616^**		-0.530^**		-0.103	-0.794^**	-0.301	0.147	-0.318	1
孔隙度	0.794^**		0.300		0.730^**	0.659^**	0.515^**	0.708^**	0.210	-0.536^*	1
C/N	0.635		0.353		0.84	0.533	0.413	0.156	0.372	-0.470	0.689^*	1