In the Kali Gandaki Valley in Central Nepal, Ephedra gerardiana and E. pachyclada show species specificity for physical and chemical characteristics of soils. Here, the relationship between soil characteristics and ephedrine and pseudoephedrine contents was examined. E. gerardiana grew in moist alpine scrub and upper alpine meadow from 3735 to 4156 m a.s.l., while E. pachyclada grew in the lower Caragana steppe and dry alpine scrub from 2629 to 3671 m a.s.l. The soil texture of E. gerardiana and E. pachyclada collection sites were classified as loam or sandy loam mainly composed of sand and silt. Loss on ignition (%) of soil in E. gerardiana habitats (28.4–35.0%) was markedly higher than for that in E. pachyclada habitats (14.2–17.2%). E. pachyclada soil (pH 8.4–9.2) was more alkaline than that for E. gerardiana (pH 8.5). The five ions (Cl⁻, SO₄²⁻, Ca²⁺, Mg²⁺, and Na⁺) in soil of E. pachyclada (Cl⁻, 0.01–18.97 mmol/100 g dry soil weight; SO₄²⁻, 1.95–83.33; Ca²⁺, 3.79–77.91; Mg²⁺, 1.28–27.9; Na⁺, 0.94–34.49) were markedly higher than those of E. gerardiana (Cl⁻, 0.18–0.29; SO₄²⁻, 0.07–0.08; Ca²⁺, 4.19–4.59; Mg²⁺, 0.22–0.58; Na⁺, 0.93–1.40). The main factor contributing to strongly alkali soils for each species was different between E. gerardiana and E. pachyclada: CaCO₃ for E. gerardiana and CaSO₄, MgSO₄, NaCl, or a combination of these for E. pachyclada. The total ephedrine and pseudoephedrine content in E. gerardiana and E. pachyclada ranged from 1.67–1.88%DW and 1.95–4.80%DW, respectively. Both E. gerardiana and E. pachyclada were amenable for use a raw material source for extraction of ephedrine and pseudoephedrine, and the ephedrine content of both species showed a statistically significantly positive correlation with Mg²⁺ and Na⁺ contents of the soil.

中文翻译：

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尼泊尔中部 Kali Gandaki 山谷麻黄和 E. pachyclada 栖息地土壤的理化特征。

在尼泊尔中部的 Kali Gandaki 山谷，麻黄和E. pachyclada显示出土壤物理和化学特征的物种特异性。在这里，研究了土壤特征与麻黄碱和伪麻黄碱含量之间的关系。E. gerardiana生长于 3735 至 4156 m asl 的潮湿高山灌丛和上部高山草甸中，而E. pachyclada生长于2629 至 3671 m asl的下部Caragana草原和干燥的高山灌丛中E. gerardiana和E. pachyclada的土壤质地收集地点被归类为主要由沙子和淤泥组成的壤土或砂壤土。E. gerardiana土壤的烧失量 (%)栖息地 (28.4-35.0%) 明显高于E. pachyclada栖息地 (14.2-17.2%)。E. pachyclada土壤 (pH 8.4–9.2) 比E. gerardiana (pH 8.5) 的碱性更强。E. pachyclada土壤中的五种离子（Cl ^-、SO ₄ ^2-、Ca ²⁺、Mg ²⁺和 Na ⁺）（Cl ^-，0.01–18.97 mmol/100 g 土壤干重；SO ₄ ^2-， 1.95–83.33; Ca ²⁺ , 3.79–77.91; Mg ²⁺ , 1.28–27.9; Na ⁺ , 0.94–34.49) 显着高于E. gerardiana (Cl^- , 0.18–0.29; SO ₄ ²⁻ , 0.07–0.08; Ca ²⁺ , 4.19–4.59; Mg ²⁺ , 0.22–0.58; Na ⁺ , 0.93–1.40)。有助于为每个物种强烈碱土壤的主要因素是不同之间E. gerardiana和E. pachyclada：碳酸钙₃为E. gerardiana和的CaSO ₄，用MgSO ₄，NaCl或为这些的组合E. pachyclada。E. gerardiana和E. pachyclada 中麻黄碱和伪麻黄碱的总含量分别为 1.67-1.88%DW 和 1.95-4.80%DW。无论E. gerardianaE. pachyclada和E. pachyclada适合用作提取麻黄碱和伪麻黄碱的原料来源，并且这两个物种的麻黄碱含量与土壤中的Mg ²⁺和 Na ⁺含量呈统计学显着正相关。