Relationship between vegetation biomass and soil bulk density on unstable slopes in different climatic regions: a case study of Jiangjiagou Watershed in Dongchuan District of Kunming City, Yunnan Province of southwestern China

Wu Jianzhao; Sun Fan; Cui Yu; He Jingwen; Liu Ying; Li Jian; Lin Yongming; Wang Daojie

doi:10.12171/j.1000-1522.20190066

Journal of Beijing Forestry University > 2020 > 42(3): 24-35. > DOI: 10.12171/j.1000-1522.20190066

Wu Jianzhao, Sun Fan, Cui Yu, He Jingwen, Liu Ying, Li Jian, Lin Yongming, Wang Daojie. Relationship between vegetation biomass and soil bulk density on unstable slopes in different climatic regions: a case study of Jiangjiagou Watershed in Dongchuan District of Kunming City, Yunnan Province of southwestern China[J]. Journal of Beijing Forestry University, 2020, 42(3): 24-35. DOI: 10.12171/j.1000-1522.20190066

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Relationship between vegetation biomass and soil bulk density on unstable slopes in different climatic regions: a case study of Jiangjiagou Watershed in Dongchuan District of Kunming City, Yunnan Province of southwestern China

Wu Jianzhao^1,2,3,,
Sun Fan^1,3,
Cui Yu^1,2,3,
He Jingwen^1,2,3,
Liu Ying^1,2,3,
Li Jian^1,3,
Lin Yongming^1,2,3, ,,
Wang Daojie^2,4

1.
College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, Fujian, China
2.
Key Laboratory of Mountain Hazards and Surface Processes, Chinese Academy of Sciences, Chengdu 640001, Sichuan, China
3.
Key Laboratory for Forest Ecosystem Process and Management of Fujian Province, Fuzhou 350002, Fujian, China
4.
Institute of Mountain Hazards and Environment, Chinese Academy of Sciences and Ministry of Water Conservancy, Chengdu 610041, Sichuan, China

More Information

Received Date: January 24, 2019
Revised Date: September 05, 2019
Available Online: December 23, 2019
Published Date: March 30, 2020

Graphical Abstract

Abstract

Abstract

ObjectiveThis paper aims to investigate the characteristics and relationships between soil bulk density and biomass of unstable slopes in debris flows for different climate types, which is a prerequisite for ecological restoration based on local conditions and is very important for the accurate assessment of the stable development and changes of the ecosystem in this region.
MethodThe temperate humid mountain ridge region (Dadi shady slope, Xiaojianfeng sunny slope), subtropical and warm temperate subhumid region (Duozhao Gully sunny slope), subtropical dry-hot valley region (Daaozi Gully shade slope, Chajing Gully sunny slope) for the Jiangjiagou Basin were selected as a study area. Taking the stable area, the unstable area and the accumulation area of the unstable slope of each climatic region as the sample plot, and conducting vegetation community surveys, plant and stratified soil sample (0−5 cm, 5−10 cm, 10−20 cm) collection, then soil bulk density, and the biomass of the aboveground and underground parts of the plants were determined.
Result(1) The biomass of arbor in subtropical and warm temperate subhumid region was significantly higher than that in temperate humid mountain ridge region (P < 0.05). However, the biomass of litter was significantly higher in temperate humid mountain ridge region than in subtropical and warm temperate subhumid region (P < 0.05). In unstable slopes of subtropical dry-hot valley region without trees, aboveground biomass, underground biomass and total biomass showed stable area > unstable area > accumulation area (P < 0.05). (2) The relationship between aboveground biomass and underground biomass of herbaceous plants with unstable slopes in different climatic regions was in accordance with the allometric growth model of root and crown, showing a steady growth ratio. (3) In general, climatic factors and section factors and their interactions had significant effects on biomass and stratified soil bulk density (P < 0.05), however, in this study, the soil bulk density of unstable slopes in different climate regions had little spatial variability, showing weak variability. (4) With the increase of soil bulk density of 0−5 cm, the underground and aboveground biomass and total biomass all decreased, however, there was no significant change in the root shoot ratio.
ConclusionThis study elucidates the spatial distribution pattern of soil bulk density, underground biomass, aboveground biomass and root/canopy ratio along the environmental gradient in the watershed with frequent debris flow. The systematic analysis of the relationship between them will be conducive to the analysis of the regulation characteristics of environmental factors, and is of great significance for further ecological restoration research on the effects of environmental factors.
- climate type,
- debris flow,
- section,
- soil bulk density,
- biomass,
- root shoot ratio

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References (48)

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Relationship between vegetation biomass and soil bulk density on unstable slopes in different climatic regions: a case study of Jiangjiagou Watershed in Dongchuan District of Kunming City, Yunnan Province of southwestern China