WANG Heng-song,XIONG Kang-ning,LIU Yuan.Freezing and Thawing Action on Soil Physical Characters in Karst Areas——With a Special Reference to Wangjiazhai and Yangchangdong Catchments of Qingzhen, Guizhou[J].Research of Soil and Water Conservation,2009,16(02):101-106.
喀斯特地区冻融作用对土壤物理特性的影响——以王家寨羊昌洞小流域为例
- Title:
- Freezing and Thawing Action on Soil Physical Characters in Karst Areas——With a Special Reference to Wangjiazhai and Yangchangdong Catchments of Qingzhen, Guizhou
- 分类号:
- S157;S152
- 摘要:
- 喀斯特山区土层普遍较薄,冬春季节冰雪凝冻使土壤结构发生变化.冻融作用使土壤经历一系列物理、化学和生物变化过程.从冰冻土壤的物理特征,探讨其土壤冻融机制与环境效应,为岩溶山区生态恢复和防治水土流失提供理论依据.以贵州清镇示范区王家寨-羊昌洞小流域为例,选5处有径流池的样地,与2007年同期作对比,从样品的土壤物理特性研究岩溶土壤冰冻作用的特征.结果表明:冻融作用土壤团聚体的水稳性差,>0.25mm干稳性团粒和水稳性团粒总量比对比土壤总量平均值分别减少2.66%和4.78%;土壤结构体破坏率、分散率、稳渗速率、崩解速率以及总孔隙度分别提高了2.64%、5.588%、11%、40.16%、3.43%;表层土体松散,土壤抗侵蚀性减弱、易加速水土流失.初步提出岩溶山区恢复生态保护植被等措施是预防冻害的良好途径.
- Abstract:
- Soil layer is universal thin in mountain area and freezing makes the soil structure to change in spring and winter.Freezing and thawing action makes soil through a series of physical,chemical and biological changes.From the physical feature of land freezing caused,this study planned to probe into land freezing mechanisms and environmental effects to provide theory base for ecological resuming and prevention soil erosion in Karst mountain area.This paper was mainly on the results of soil physical properties.Five samples were selected and the impact of freezing and thawing action on soil physical characteristics were studied.The results showed as follows:the structural properties of freezing and thawing action were spoiled with lack of water stable aggregates(>0.25 mm) decrease to 2.66% and 4.78% respectively.The soil structure destroy rate,separate stabilization infiltrate,collapse rate and soil porosity,soil porosity and topsoil relax increase 2.64%,5.588%,11%,40.16%,3.43% respectively.Preliminary measures of preventing freezing were brought forward for the ecological vegetation restoration in karst mountain area.Loose surface soil,soil anti-erosion and reduced soil erosion prone to speed up.
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备注/Memo
收稿日期:2008-10-1;改回日期:。
基金项目:国家“十一五”科技支撑计划重大课题(2006BAC01A09-07);贵州省喀斯特石漠化综合防治工程技术研究中心建设项目(黔科合社J字[2008]4002)
作者简介:王恒松(1967- ),男(侗族),硕士研究生,研究方向:喀斯特生态监测与土壤侵蚀等研究.E-mail:wanghengsong796@163.com
通讯作者:熊康宁(1958- ),教授,研究方向:喀斯特与洞穴、喀斯特环境与综合治理.E-mail:xiongkn@1