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首页> 外文期刊>Communications in Soil Science and Plant Analysis >Suitability of extractants for predicting available sulfur in natural grassland in the Inner Mongolia steppe of China.
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Suitability of extractants for predicting available sulfur in natural grassland in the Inner Mongolia steppe of China.

机译：提取剂对预测中国内蒙古草原天然草地中有效硫的适用性。

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摘要

This study aims to compare the suitability of different extractants for predicting the availability of sulfur (S) in natural grassland in a sulfur response trial on three different soil types in the Inner Mongolia steppe of China during 1999. Sulfur (0 and 30 S kg/ha) was applied as gypsum to the natural grassland on a dark chestnut soil (Udic Calciustepts), a typical (Typical Calciustepts) and a sandy chestnut soil (Aridic Calciustepts) on 6 May 2000. For soil analysis, seven different extractants have been employed. The inorganic SO4-S concentration was determined by ion chromatography. Additionally, in the Ca(H2PO4)2 extract, the total soluble S was determined employing turbidimetry. Weak salt solutions (0.15% CaCl2, Ca(H2PO4)2, and KH2PO4) extracted similar amounts of SO4-S. Extraction with 0.025 M KCl provided the lowest SO4-S values. Deionized water dissolved significantly more SO4-S in the control plots than most weak salt extractants. The concentration of soluble organic S decreased in the control plots after 100 days of plant growth, indicating that the organic S pool contributed significantly to the S nutrition of the forage crops. Significant relationships among the SO4-S in the soil determined in different extracts and crop yield, sulfur content in the forage, and total sulfur uptake were only found for the Ca(H2PO4)2 extract. In general, the correlation coefficients proved to be unsatisfactory for field experimentation..
机译：这项研究旨在比较1999年中国内蒙古草原三种不同土壤类型的硫反应试验中，不同提取剂对预测天然草地中硫（S）有效性的适用性。硫（0和30 S kg / ha）于2000年5月6日在深色栗土（Udic Calciustepts），典型（典型Calciustepts）和板栗沙质土壤（Aridic Calciustepts）上作为石膏施用到天然草地上。对于土壤分析，使用了七种不同的萃取剂。通过离子色谱法测定无机SO 4 -S的浓度。此外，在Ca（H2PO4）2提取物中，使用比浊法测定了总可溶性S。弱盐溶液（0.15％CaCl2，Ca（H2PO4）2和KH2PO4）提取的SO4-S量相似。用0.025 M KCl萃取可提供最低的SO4-S值。与大多数弱盐萃取剂相比，去离子水在对照样区中溶解的SO4-S明显多得多。在植物生长100天后，对照地块中可溶性有机S的浓度降低，表明有机S池显着促进了饲草作物的S营养。仅在Ca（H2PO4）2提取物中发现了不同提取物中确定的土壤中SO4-S与作物产量，草料中的硫含量以及总硫吸收之间的重要关系。通常，相关系数被证明不能满足野外实验的要求。

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