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[1]YANG Liusheng,LIN Jingyuan,Molder Erken,et al.Effects of Climate Types and Slope Sections on the pH of Soil in the Unstable Slope with High-Frequency Debris Flow in Jiangjiagou Watershed of Yunnan Province[J].Research of Soil and Water Conservation,2022,29(01):105-112.

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Effects of Climate Types and Slope Sections on the pH of Soil in the Unstable Slope with High-Frequency Debris Flow in Jiangjiagou Watershed of Yunnan Province

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 29 Number of periods: 2022 01 Page number: 105-112 Column: Public date: 2022-02-20

Title:: Effects of Climate Types and Slope Sections on the pH of Soil in the Unstable Slope with High-Frequency Debris Flow in Jiangjiagou Watershed of Yunnan Province

Author(s):: YANG Liusheng^1,2,3, LIN Jingyuan¹, Molder Erken¹, GAO Ruoyun^1,2,3, YU Hang^1,2,3, LIN Yongming^1,2,3, WANG Daojie^2,4, LI Jian^1,3; (1.College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China; 2.Key Laboratory of Mountain Hazards and Surface Processes, Chinese Academy of Sciences, Chengdu 610041, China; 3.Key Laboratory for Forest Ecosystem Process and Management of Fujian Province, Fuzhou 350002, China; 4.Institute of Mountain Hazards and Environment, Chinese Academy of Sciences and Ministry of Water Resources, Chengdu 610041, China)

Keywords:: debris flow; unstable slope; soil pH; climate; zone

CLC:: S153.4

DOI:: -

Abstract:: To explore the effects of climate types and slope sections on the soil pH in the unstable slope with high-frequency debris flow of Jiangjiagou Watershed, and to grasp the spatial variation of soil pH, soils in the sections(deposition area, instability area, stable area)of typical unstable slopes in the temperate humid mountainous area, subtropical and warm temperate semi-humid area, and subtropical dry-hot valley area of the basin were taken as the research objects. We collected a total of 135 soil samples of 0—20 cm, combined with the meteorological data of the Dongchuan Debris Flow Observation and Research Station of the Chinese Academy of Sciences for 13 years, and analyzed the correlation between different climate and unstable slope sections and the soil pH value. The results showed that: there were significant differences between the soils of unstable slopes in humid temperate mountainous and subtropical and warm temperate semi-humid areas(pH<6.5)and in subtropical dry-hot valleys(pH>7.5)(p<0.05); the soil pH values of deposition zone, instability zone and stable zone in subtropical dry and hot valley area were higher than those in subtropical, warm temperate semi-humid area and temperate humid mountainous area(p<0.05); there was a significant positive correlation between soil pH on unstable slopes and temperature(p<0.05), and a very significant negative correlation with precipitation(p<0.001)and soil water content(p<0.001); climate, zone and their interaction had extremely significant effects on the soil pH value of unstable slope surface(p<0.001); except the two sample plots of Daouzigou Shady Slope and Chajinggou Sunny Slope, the pH values of the unstable slopes of Dadi Shady Slope, Xiaojianfengyang Slope and Duozhaogou sunny slope showed deposition zone>stable zone. The soil pH of the unstable slope surface in the Jiangjiagou watershed was affected by both climate and section, and its main influencing factors included temperature, precipitation, soil water content, and disaster disturbances.

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Last Update: 2022-02-20