A Combined Penetrometer-Moisture Probe for Surveying Soil Properties of Natural Hillslopes
A Combined Penetrometer-Moisture Probe for Surveying Soil Properties of Natural Hillslopes
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DOI：
10.2136/vzj2008.0033
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发表时间：
2009-02-01
影响因子：
2.8
通讯作者：
Mizuyama, Takahisa
中科院分区：
文献类型：
--
作者：
Kosugi, Ken'ichirou;Yamakawa, Yosuke;Mizuyama, Takahisa
土壤含水量和机械强度的空间分布信息是山地流域水文地貌研究的基础。为同时测定天然山坡土壤含水量θ和土壤表层渗透阻力N-c，研制了一种新型的土壤水分仪-水分探头组合（CPMP）。新的CPMP具有强大的配置，以减少渗透到砾石和岩石天然土壤过程中水分探头故障的频率，它的渗透深度高达552厘米，这是约4至14倍以上的任何以前的CPMP开发的农业土壤的最大可测量深度。实验室校准和现场验证表明，CPMP成功地产生垂直分布θ和N-C与传统方法测量的相似。与需要挖掘深沟的传统方法相比，CPMP提供的θ剖面测量耗时更少，破坏性更小。由于theta剖面考虑了土壤覆盖层的分层特征以及地下水位的深度，CPMP比传统的锥形流量计更有效地测量土壤覆盖层的水文地貌结构。的CPMP是成功的，在确定的空间分布θ和N-C的河源盆地风化花岗岩基岩。从两者的直接比较。在同一深度附近不同日期测得的N-c值表明，当θ增大0.15以上时，N-c有减小的趋势。
Information on spatial distributions of soil water content and mechanical strength is fundamental to hydrogeomorpho-logical studies in mountainous watersheds. For simultaneous measurements of soil water content, theta, and penetration resistance, N-c, of soil mantles on natural hillslopes, we developed a new type of combined penetrometer-moisture probe (CPMP). The new CPMP has a robust configuration to reduce the frequency of moisture probe breakdowns during penetration into gravelly and rocky natural soils, and it has a penetration depth of up to 552 cm, which is about four to 14times greater than the maximum measurable depth of any previous CPMP developed for agricultural soils. Laboratory calibrations and field validations showed that the CPMP succeeded in producing vertical distributions for theta and N-c similar to those measured with conventional methods. The CPMP provided less time-consuming and less destructive measurements of theta profiles than conventional methods that require excavation of deep trenches. Because theta profiles consider the stratified characteristics of soil mantles as well as the depths of groundwater tables, the CPMP was more effective than the conventional cone penetrometer for surveying the hydrogeomorphological structure of soil mantles. The CPMP was successful in determining the spatial distributions of theta and N-c in a headwater basin underlain by weathered granitic bedrock. From a direct comparison between two. and N-c values measured on two different days at nearby points and the same depth, it was shown that N-c tended to decrease when theta increased by more than 0.15.