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.
泥石流流域气候与区段对坡面土壤pH值的影响——以云南蒋家沟流域为例
- 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
- 文章编号:
- 1005-3409(2022)01-0105-08
- Keywords:
- debris flow; unstable slope; soil pH; climate; zone
- 分类号:
- S153.4
- 文献标志码:
- A
- 摘要:
- 为了探讨泥石流频发流域的不同气候与区段对失稳性坡面土壤pH值的影响,掌握土壤pH值的空间变异规律,以蒋家沟流域温带湿润山岭区、亚热带和暖温带半湿润区、亚热带干热河谷区的典型失稳性坡面不同区段(堆积区、失稳区、稳定区)土壤为研究对象,采用随机取样法共采集0—20 cm的土壤样本135个,结合中国科学院东川泥石流观测研究站多年的气象资料,分析了不同气候和失稳性坡面区段与土壤pH值的相关性。结果表明:温带湿润山岭区、亚热带和暖温带半湿润区失稳性坡面土壤pH值总体偏酸性(pH<6.5),与总体偏碱性(pH>7.5)的亚热带干热河谷区之间差异显著(p<0.05)。亚热带干热河谷区的堆积区、失稳区、稳定区土壤pH值均大于亚热带和暖温带半湿润区及温带湿润山岭区且差异显著(p<0.05)。失稳性坡面土壤pH值与气温存在显著的正相关关系(p<0.05),与降水量存在极显著的负相关关系(p<0.001),与土壤含水量呈极显著负相关关系(p<0.001)。气候、区段及两者的交互作用对失稳性坡面土壤pH值均存在极显著影响(p<0.001)。除大凹子沟阴坡和查菁沟阳坡两个样地外,大地阴坡、小尖风阳坡和多照沟阳坡的失稳性坡面区段pH值均表现为堆积区>稳定区。蒋家沟流域失稳性坡面土壤pH受气候和区段的共同影响,气温、降水及土壤含水量是主要影响因子,同时还受到灾害扰动的影响。
- 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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备注/Memo
收稿日期:2020-12-19 修回日期:2021-01-19资助项目:国家自然科学基金项目(42071132,41790434); 中国科学院山地灾害与地表过程重点实验室开放研究基金资助项目“生态脆弱区植被对滑坡体的适应策略与调控作用(2019)”; 福建农林大学杰出青年科研人才计划项目(xjq2017016)第一作者:杨柳生(1995—),男,贵州三都人,在读硕士研究生,主要从事森林资源经营管理方面研究。E-mail:1329275818@qq.com通信作者:林勇明(1982—),男,福建福安人,博士,副教授,主要从事区域资源管理、生态学方面研究。E-mail:monkey1422@163.com