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泥炭/砂混合物是一种广泛应用于高尔夫果岭坪床,运动场草坪,园艺盆栽,及滤水系统中的基质。然而,对于泥炭/砂混合基质水力特性的直接测量耗时较长。试验的目的为:(1)测试符合美国高尔夫协会(USGA)推荐标准的砂与高比例泥炭混合基质的饱和导水率(Ksat)是否为层流并遵循达西法则。(2)研究泥炭类别和有机物含量对之前建立的预测饱和导水率的多重线性回归模型的准确性的影响。试验采用3种泥炭类别即木本泥炭藓(Peat,Inc.Minnesota,USA),苔藓泥炭(Sun Gro Horticulture,Maryland,USA)和苇苔泥炭(Dakota Peat,North Dakota,USA),并分别按照泥炭占0%,0.2%,0.4%,0.8%,1.6%,4%,8%和10%的重量配比与纯砂混合。试验评估的模型如下:Log10(Ksat)=5.340 7-0.528 6ρb-1.2846CP-0.044 2c+0.0612φ5-0。6095φ95,其中ρb为容重(g/cm3),CP为毛管孔隙度(%),c为粉粒含量(%),φ5,φ10,φ16,φ84,φ95为土壤粒径分布曲线分析中以phi(φ)为单位的粒径参数,其中φx=-log(2,d),x代表筛析法测定下直径小于d的颗粒所占重量百分比。结果表明:在液压压力梯度小于3的范围内,混合基质饱和导水率为层流并遵循达西法则。结果也表明:除了含有配比超过4%的腐殖化程度低的苔藓泥炭混合基质外,对于有机物含量在0%~10%的泥炭/砂混合基质,该模型对饱和导水率的预测结果与实际测定结果符合度较好(R2=0.74)。
The peat / sand mixture is a matrix that is widely used in golf greenstrip, sports field lawn, horticultural pot, and drainage systems. However, the direct measurement of hydraulic properties of peat / sand mixed substrates takes a long time. The purpose of the test was to: (1) test whether the saturated Ksat of sand and high proportion peat mixed substrates that meet USGA recommendations is laminar and follows Darcy’s law. (2) The effect of peat species and organic matter content on the accuracy of the previously established multiple linear regression model for predicting saturated hydraulic conductivity was investigated. Three peat species, Peat, Inc. Minnesota, USA, Sun Gro Horticulture, Maryland, USA and Dakota Peat, North Dakota, USA, Accounting for 0%, 0.2%, 0.4%, 0.8%, 1.6%, 4%, 8% and 10% by weight of the mixture with pure sand. The model for the test evaluation is as follows: Log10 (Ksat) = 5.340 7-0.528 6ρb-1.2846CP-0.044 2c + 0.0612φ5-0.6095φ95 where ρb is bulk density (g / cm3), CP is capillary porosity (%), c Is the particle size parameter in phi (φ), where φx = -log (2, d), where x is the particle size (%), φ5, φ10, φ16, φ84 and φ95 are the particle size parameters in the soil particle size distribution curve analysis Sieve analysis of particles under the diameter of less than d weight percentage. The results show that the saturation hydraulic conductivity of the mixed matrix is laminar and follows the Darcy rule under the condition that the hydraulic pressure gradient is less than 3. The results also show that in addition to the moss-peat mixed matrix containing less than 4% of humic degree, the model predicts the saturated hydraulic conductivity of peat / sand mixed matrix with organic matter content of 0% ~ 10% Good agreement with the actual measurement (R2 = 0.74).