华北落叶松林和油松林地表可燃物特征、土壤理化性质及林下植物多样性对林间草地放牧的响应

doi:10.11707/j.1001-7488.LYKX20250161

Abstract

Abstract:

Objective: This study aimed to investigate the effects of forest grassland grazing on surface fuel characteristics, potential surface fire behavior, soil physicochemical properties, and understory plant diversity in Larix gmelinii var. principis-rupprechtii and Pinus tabuliformis forests, and to propose a grazing-based sustainable fire risk management strategy that provides a scientific pathway for fire risk prevention in forest management areas. Method: This study focused on two typical coniferous forests in north China: mature stands (41?60 years old) of L. gmelinii var. principis-rupprechtii and P. tabuliformis. Sample plots were established under ungrazed and moderate grazing conditions (3 cattle·hm^?2), where surface fuel characteristics, soil physicochemical properties, and understory plant diversity were surveyed. Based on the 50th percentile (16 km?h^?1) and 97th percentile (27 km?h^?1) of wind speed during the fire season (2010—2023), simulations of surface fire spread rate, fireline intensity, and flame length were conducted using BehavePlus 6.0. One-way ANOVA was applied to evaluate the long-term impacts of grazing on soil physicochemical properties, and principal component analysis (PCA) was used to assess the comprehensive effects of grazing on surface fuel characteristics, potential surface fire behavior, and understory plant diversity, thereby exploring the feasibility of grazing as an ecological fuel management measure. Result: 1) Forest grassland grazing significantly reduced herb fuel load and surface fuelbed depth in both forest types by 72.09%?75.22% and 79.07%?89.74%, respectively, while enhancing herb layer species diversity, with the Shannon-Wiener index increasing by 12.42%?42.67% and the Simpson index by 11.11%?33.33%. Grazing decreased total soil phosphorus by 21.74% in L. gmelinii var. principis-rupprechtii forests and total soil potassium by 2.91% in P. tabuliformis forests; 2) Fire behavior simulations demonstrated that under extreme wind speeds (27 km?h^?1), grazing maintained fireline intensity below 500 kW?m^?1 and reduced flame length from 3?4 m to less than 1.5 m; 3) PCA results revealed that grazing treatments achieved the highest comprehensive scores for both forest types. In L. gmelinii var. principis-rupprechtii forests, grazing balanced wildfire risk reduction with ecological resilience, whereas in P. tabuliformis forests, combining grazing with the introduction of highly fire-resistant herbaceous species may better harmonize fire risk control with understory plant diversity conservation. Conclusion: Moderate intensity grazing can serve as a nature-based wildfire risk management solution, but attention should be paid to the risk of phosphorus and potassium depletion under long-term grazing, and grazing strategies should be tailored to species-specific ecological feedbacks.

Key words: grazing, forest grassland, fuel characteristic, potential surface fire behavior, plant diversity

CLC Number:

S762.3

Aoli Suo,Feng Chen,Junwei Gong,Dingye Cheng,Shi’ao Dai,Chenggong Ma,Xiaodong Liu. Response of Surface Fuel Characteristics, Soil Physicochemical Properties, and Understory Plant Diversity to Forest Grassland Grazing in Larix gmelinii var. principis-rupprechtii and Pinus tabuliformis Forests[J]. Scientia Silvae Sinicae, 2025, 61(10): 60-73.

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林分类型 Forest stand type	处理Treatment	统计Statistic	变量Variable
林分类型 Forest stand type	处理Treatment	统计Statistic	海拔 Elevation/m	坡度 Slope/(°)	林分密度 Stand density/ (trees?hm^?2)	胸径 DBH/cm	胸高断面积 Basal area/ (m²?hm^?2)	林分高度 Stand height/m	郁闭度 Canopy density
华北落叶松林 Larix gmelinii var. principis-rupprechtii forest	禁牧Ungrazed 41.726 049°N 118.218 230°E	平均值Mean	1 242.7b	13.67a	1 085a	19.13a	127.82a	14.0a	0.50a
	禁牧Ungrazed 41.726 049°N 118.218 230°E	标准Standard deviation	0.8	0.58	36	0.45	7.58	0.4	0.05
	放牧Grazed 41.725 535°N 118.218 918°E	平均值Mean	1 255.2a	15.00a	1 042a	19.50a	126.61a	13.9a	0.40a
	放牧Grazed 41.725 535°N 118.218 918°E	标准Standard deviation	3.2	1.00	63	0.36	4.52	0.2	0.05
油松林 Pinus tabuliformis forest	禁牧Ungrazed 41.723 998°N 118.205 965°E	平均值Mean	1 349.5b	12.00a	648a	29.90a	191.54a	14.7b	0.42a
	禁牧Ungrazed 41.723 998°N 118.205 965°E	标准Standard deviation	18.6	2.65	25	0.53	14.81	0.4	0.03
	放牧Grazed 41.723 742°N 118.204 803°E	平均值Mean	1 501.0a	11.33a	592a	29.73a	176.56a	16.2a	0.40a
	放牧Grazed 41.723 742°N 118.204 803°E	标准Standard deviation	4.8	2.31	38	0.12	9.62	0.1	0.00

林分类型Forest stand type	处理 Treatment	统计Statistic	第50百分位数 50th percentile (16 km?h^?1)			第97百分位数 97th percentile (27 km?h^?1)
林分类型Forest stand type	处理 Treatment	统计Statistic	地表火蔓延速率Surface fire rate of spread/ (m?min^?1)	地表火火线强度Surface fireline intensity/ (kW?m^?1)	地表火火焰长度Surface fire flame length/m	地表火蔓延速率Surface fire rate of spread/ (m?min^?1)	地表火火线强度Surface fireline intensity/ (kW?m^?1)	地表火火焰长度Surface fire flame length/m
华北落叶松林 Larix gmelinii var. principis-rupprechtii forest	禁牧 Ungrazed	平均值Mean	6.67a	3 271.00a	3.20a	10.93a	5 482.33a	4.07a
	禁牧 Ungrazed	标准差Standard deviation	0.67	169.12	0.1	1.24	352.43	0.15
	放牧 Grazed	平均值Mean	0.10b	6.33b	0.13b	0.13b	7.67b	0.20b
	放牧 Grazed	标准差Standard deviation	0.00	4.93	0.06	0.06	6.43	0.10
油松林 Pinus tabuliformis forest	禁牧 Ungrazed	平均值Mean	6.77a	1 809.33a	2.43a	11.90a	3 290.67a	3.17a
	禁牧 Ungrazed	标准差Standard deviation	0.80	375.22	0.25	1.85	763.97	0.35
	放牧 Grazed	平均值Mean	1.10b	321.00b	1.10b	1.70b	490.67b	1.33b
	放牧 Grazed	标准差Standard deviation	0.20	99.78	0.17	0.30	145.55	0.21

土壤理化性质 Soil physicochemical properties	华北落叶松林 Larix gmelinii var. principis-rupprechtii forest		油松林 Pinus tabuliformis forest
土壤理化性质 Soil physicochemical properties	禁牧Ungrazed	放牧Grazed	禁牧Ungrazed	放牧Grazed
pH	6.40±0.04b	6.71±0.23a	6.24±0.05a	6.28±0.08a
阳离子交换量Cation exchange capacity/ (cmol?kg^?1)	29.42±1.65a	26.18±4.73a	26.64±3.16a	27.99±1.29a
有机质含量Soil organic matter content/ (g?kg^?1)	53.57±2.72a	43.17±12.47a	39.31±6.87a	44.63±6.59a
全氮含量Total nitrogen content/ (g?kg^?1)	2.68±0.19a	2.35±0.52a	1.85±0.36a	2.07±0.35a
全磷含量Total phosphorus content/ (g?kg^?1)	0.69±0.07a	0.54±0.11b	0.61±0.13a	0.58±0.18a
全钾含量Total potassium content/ (g?kg^?1)	21.63±1.21a	22.03±0.58a	22.66±0.43a	22.00±0.47b
交换性钙含量Exchangeable calcium content/ (mg?kg^?1)	6 476.56±368.57a	6 885.79±691.86a	7 195.30±448.70a	7 452.02±643.33a
交换性镁含量Exchangeable magnesium content/ (mg?kg^?1)	445.99±111.38a	535.85±76.22a	557.64±96.32a	520.58±141.58a
有效硫含量Available sulfur content/ (mg?kg^?1)	6.16±0.85a	4.70±1.70a	5.90±1.08a	5.06±0.99a
有效铁含量Available iron content/ (mg?kg^?1)	137.78±21.30a	124.37±47.58a	156.94±26.45a	172.43±25.98a
有效锰含量Available manganese content/ (mg?kg^?1)	48.18±9.81a	43.24±18.86a	25.39±3.11a	30.84±10.28a
有效锌含量Available zinc content/ (mg?kg^?1)	2.49±1.01a	1.80±1.73a	0.79±0.13a	0.55±0.26a

项目Item	指标 Variables	主成分1 Principal component 1 (PC1)	主成分2 Principal component 2 (PC2)	主成分3 Principal component 3 (PC3)
地表可燃物特征 Surface fuel characteristic	1 h 时滞可燃物载量 1 h time-lag fuel load/ (t?hm^?2)	?0.917	?0.572	0.842
	10 h 时滞可燃物载量 10 h time-lag fuel load/ (t?hm^?2)	0.525	?0.605	0.038
	100 h 时滞可燃物载量 100 h time-lag fuel load/ (t?hm^?2)	0.456	1.059	?1.063
	草本可燃物载量 Herb fuel load/ (t?hm^?2)	1.284	0.335	?0.367
	地表可燃物床层厚度 Surface fuel bed depth/m	1.616	?0.483	?0.159
地表潜在火行为 Potential surface fire behavior	地表火蔓延速率 Surface fire rate of spread/ (m?min^?1)	1.601	?0.555	?0.134
	地表火火线强度 Surface fireline intensity/ (kW?m^?1)	1.444	?0.915	0.005
	地表火火焰长度 Surface fire flame length/m	1.538	?0.611	?0.237
多样性指数 Biodiversity index	草本层丰富度指数 Herb richness index	1.091	0.681	0.636
	草本层Shannon-Wiener多样性指数 Herb Shannon-Wiener index	1.048	1.178	0.691
	草本层Simpson多样性指数 Herb Simpson index	0.981	1.216	0.596
	灌木层Shannon-Wiener多样性指数 Shrub Shannon-Wiener index	?0.614	0.585	?0.870
特征值 Eigenvalues		5.152	2.334	1.292
方差贡献率 Proportion explained (%)		42.92	19.45	10.76
累计方差贡献率 Cumulative proportion (%)		42.92	62.38	73.15

林分类型 Forest stand type	处理 Treatment	主成分1 Principal component 1 (PC1)	主成分2 Principal component 2 (PC2)	主成分3 Principal component 3 (PC3)	综合得分 Comprehensive score	排名 Rank
华北落叶松林Larix gmelinii var. principis-rupprechtii forest	放牧Grazed	0.648	0.106	?0.369	3.109	1
油松林Pinus tabuliformis forest	放牧Grazed	0.281	?0.322	0.391	1.201	2
华北落叶松林Larix gmelinii var. principis-rupprechtii forest	禁牧Ungrazed	?0.380	0.613	?0.188	?0.771	3
油松林Pinus tabuliformis forest	禁牧Ungrazed	?0.549	?0.397	0.166	?3.541	4

Response of Surface Fuel Characteristics, Soil Physicochemical Properties, and Understory Plant Diversity to Forest Grassland Grazing in Larix gmelinii var. principis-rupprechtii and Pinus tabuliformis Forests

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