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Characteristic moisture curves and maximum water content of two crop residues

机译：两种农作物残留物的特征水分曲线和最大含水量

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摘要

Limited data are available relating water potential (Ψ) to crop residue water content (Θ), although this relationship is important to study decomposition and moisture retention of the residue layer in no-till systems and other agricultural situations where residues are used. The objectives of this study were (i) to determine the characteristic moisture curves of rye (Secale cereale L.) and clover residues (Trifolium incarnatum L.), and (ii) to determine residue characteristics that can predict maximum water content of crop residues. Air-dried residues were separated into leaves and stems, cut into 0.5 cm length pieces and saturated with distilled water. Pieces of the drained residues were dried to various water contents in the laboratory and then transferred into thermocouple psychrometer chambers. Characteristic moisture functions of the type Ψ = a ċ Θ−b, where a and b are empirical constants, were fitted to the data. The characteristic moisture curves had a similar shape to that of a Cecil sandy loam soil used as an example; however, while plant residues were able to retain up to 4.3 g H2O g−1, the mineral soil retained only 0.22 g H2O g−1. Soluble carbohydrate concentration can be used as a practical index to estimate maximum water content of residues, given the good relationship between both variables (R 2 = 0.92).
机译：尽管将水势（Ψ）与农作物残渣含水量（Θ）关联起来，但可获得的数据有限，尽管这种关系对于研究免耕系统和使用残渣的其他农业情况下残渣层的分解和水分保留很重要。这项研究的目的是（i）确定黑麦（Secale graine L.）和三叶草残留物（Trifolium incarnatum L.）的特征水分曲线，以及（ii）确定可以预测农作物残留物最大含水量的残留物特征。将风干的残留物分成叶和茎，切成0.5厘米长的块，并用蒸馏水饱和。在实验室中，将排出的残留物干燥至各种水分含量，然后转移到热电偶干湿室中。数据类型为Ψ= aċΘ-b 的特征水分函数，其中a和b为经验常数。特征水分曲线具有与作为实例的塞西尔沙质壤土相似的形状。然而，尽管植物残渣能够保留高达4.3 g H2 g g-1 ，但矿质土壤仅保留了0.22 g H2 O g-1 。鉴于两个变量之间的良好关系（R 2 = 0.92），可溶性碳水化合物的浓度可以用作估算残留物最大含水量的实用指标。

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