Temporal and spatial dynamics of soil available potassium in a post-fire Larix gmelinii forest

doi:10.3969/j.issn.1000-2006.201906009

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2020, Vol. 44 ›› Issue (5): 141-147.doi: 10.3969/j.issn.1000-2006.201906009

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Temporal and spatial dynamics of soil available potassium in a post-fire Larix gmelinii forest

ZHOU Sihan(), ZHANG Yun^*(), CUI Xiaoyang

Key Laboratory of Sustainable Forest Ecosystem Management of Ministry of Education, School of Forestry, Northeast Forestry University, Harbin 150040, China

Received:2019-06-06 Revised:2020-04-29 Online:2020-10-30 Published:2020-10-30
Contact: ZHANG Yun E-mail:xinlang2007@126.com;rowena_zy@163.com

Abstract

Abstract:

【Objective】 Both the temporal variation and spatial distribution of soil available potassium content were investigated in post-fire areas in a Larix gmelinii forest that experienced different intensity burns. The variation regularity and spatial pattern were also considered to better understand the characteristics of soil available potassium during the early restoration of burned plots and to provide insights into forest ecosystem restoration after fire disturbance.【Method】 In an L. gmelinii forest in the northern Great Xing’an Mountain region, fixed sampling points were established prior to conducting a fire experiment with three burn intensities (mild, moderate and severe). Using a soil core method, soil samples were collected within a 30 cm radius of each fixed sampling point before and after the burn, following the snowmelt season, and during the growing season. The soil available potassium content was determined using the ammo-nium acetate method. Temporal and spatial dynamics of soil available potassium in the post-fire areas were analyzed and compared.【Result】① In the mildly burned area, soil available potassium content was the same pre- and post-fire, but increased significantly following the snowmelt season, and remained at a high level during the growing season. In the moderately and severely burned areas, there was a post-fire increase in soil available potassium content which increased further following the snowmelt season, and remained unchanged during the growing season. ② The spatial pattern of burn intensity was positively correlated with the spatial pattern of soil available potassium content following the snowmelt season and during the growing season. The change rate of available potassium content after the fire was significantly positively correlated with burn intensity across all sampling times. The available potassium content or its change rate following the fire was significantly correlated with native soil available potassium content across all sampling times. The post-fire spatial pattern of soil available potassium was related to both the native soil available potassium content and burn intensity.【Conclusion】Following the snowmelt season, and during the growing season, soil available potassium content significantly increased in mildly, moderately and severely burned areas in an L. gmelinii forest. This may be beneficial for regeneration and reforestation during the initial post-fire recovery stage.

Key words: Larix gmelinii forest, forest fire experiment, burned area, soil available potassium, temporal and spatial dynamics

CLC Number:

S714.5

ZHOU Sihan, ZHANG Yun, CUI Xiaoyang. Temporal and spatial dynamics of soil available potassium in a post-fire Larix gmelinii forest[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2020, 44(5): 141-147.

Figures/Tables 7

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References 32

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火烧区 burned area	采样时间 sample time	土壤速效钾含量变化率的点位分布率分级 classification of fixed sampling points distribution percent on SAPC							变化率分布范围 SAPC range	平均变化率 average SAPC
火烧区 burned area	采样时间 sample time	≥-15%~0	≥0~15%	≥15%~30%	≥30%~45%	≥45%~60%	≥60%~75%	≥75%~90%	变化率分布范围 SAPC range	平均变化率 average SAPC
轻度 mild	T₁	40.0	50.0	10.0					-6.9~25.1	3.9
	T₂		40.0	35.0	20.0			5.0	4.4~78.4	22.0
	T₃	10.0	50.0	15.0	5.0	15.0		5.0	-3.9~87.3	20.2
中度 moderate	T₁	37.0	55.6	7.4					-7.2~17.6	3.9
	T₂		14.8	70.4	14.8				12.3~35.6	22.3
	T₃	3.7	37.0	44.4	11.1	3.7			-5.8~49.3	18.9
重度 severe	T₁		26.3	73.7					8.6~26.9	17.8
	T₂			5.3	52.6	42.1			28.9~58.4	43.4
	T₃			15.8	47.4	26.3	10.5		21.7~68.4	41.7

采样时间 sample time	轻度火烧区mild burned area				中度火烧区 moderate burned area				重度火烧区 severe burned area
采样时间 sample time	T₀	T₁	T₂	T₃	T₀	T₁	T₂	T₃	T₀	T₁	T₂	T₃
T₁	0.064				0.004^**				0.000^**
T₂	0.000^**	0.000^**			0.000^**	0.000^**			0.000^**	0.000^**
T₃	0.000^**	0.000^**	0.135		0.000^**	0.000^**	0.081		0.000^**	0.000^**	0.851

采样时间 sample time	土壤速效钾含量与火烧强度等级 correlation between SAP and fire intensity subclass		土壤速效钾含量变化率与火烧强度等级 correlation between SAPC and fire intensity subclass		火烧迹地土壤速效钾含量与火烧前速效钾含量 correlation between SAP in burned plot and unburned plot		火烧迹地土壤速效钾含量变化率与火烧前速效钾含量 correlation between SAPC in burned plot and SAP in unburned plot
采样时间 sample time	相关系数(r) correlation coefficient	P	相关系数(r) correlation coefficient	P	相关系数(r) correlation coefficient	P	相关系数(r) correlation coefficient	P
T₀	0.090	0.471
T₁	0.173	0.165	0.574	0.000^**	0.914	0.000^**	-0.280	0.023^*
T₂	0.322	0.008^**	0.567	0.000^**	0.850	0.000^**	-0.498	0.000^**
T₃	0.318	0.009^**	0.424	0.000^**	0.723	0.000^**	-0.381	0.002^**

Temporal and spatial dynamics of soil available potassium in a post-fire Larix gmelinii forest

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