A Device for Simulating Soil Nutrient Extraction and Plant Uptake

YANG Xu-Jian; LAI Yong-Lin; MO Jin-Yu; SHEN Hong

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A Device for Simulating Soil Nutrient Extraction and Plant Uptake

机译：模拟土壤养分提取和植物吸收的装置

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In situ evaluating the availability of soil nutrients has been a challenge.In this study,a new type of Device for Simulating Soil Nutrient Extraction and Plant Uptake (DSSNEPU) and its operating procedures were introduced.The device consists of a sampling tube,a fluid supply system,a low pressure system,a tube sheath and an elution cylinder.The sampling tube was firstly soaked in the solution of 0.5 mol L-1 NaHCO3 and then buried into soils.The fluid supply system was connected to the sampling tube and the deionized water was supplied.During the period,low pressure system started a vacuum for 3 min every 10 min interval.After extraction,the sampling tube was removed and the nutrients on the sampling tube were eluted with 0.5 mol L-1 HC1.The elution solution was used for nutrient measurement.The amounts of P and K extracted by DSSNEPU reached the maximal values after 4 h.No significant increases of P and K were observed for longer extraction duration.The optimal temperature for extracting P and K was 30 ℃ in this experiment.Extracted P and K were increased by 83.3％ and 84.6％ with the employment of low pressure system in comparison to those without employing low pressure system.Correlation analysis indicated that P and K extracted by DSSNEPU were highly correlated with those by conventional chemical extraction and by plant uptake.The above results suggest that this device is applicable to assess the availability of nutrients in soils.

机译：在原地评估土壤养分的有效性一直是一个挑战。在这项研究中，介绍了一种新型的土壤养分提取和植物吸收模拟装置（DSSNEPU）及其操作程序。该装置由采样管，液体供料系统，低压系统，管鞘和洗脱瓶。首先将取样管浸入0.5 mol L-1 NaHCO3溶液中，然后埋入土壤中。将供液系统连接到取样管和提供去离子水。在此期间，低压系统每隔10分钟开始抽真空3 min。提取后，移出采样管，并用0.5 mol L-1 HCl洗脱采样管上的营养物。用DSSNEPU提取的磷和钾量在4h后达到最大值，提取时间较长时磷和钾没有明显增加。 ng P和K在30℃时。采用低压系统提取的P和K与不使用低压系统相比分别增长了83.3％和84.6％。相关分析表明，DSSNEPU提取的P和K与通过常规化学提取和植物吸收引起的高度相关。以上结果表明，该装置可用于评估土壤中养分的利用率。

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《土壤圈（英文版）》 |2012年第6期|755-763|共9页
作者
YANG Xu-Jian; LAI Yong-Lin; MO Jin-Yu; SHEN Hong;
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作者单位

Laboratory of Root Layer Control, College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642(China);

Laboratory of Root Layer Control, College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642(China);

Laboratory of Root Layer Control, College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642(China);

Laboratory of Root Layer Control, College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642(China);

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收录信息中国科学引文数据库(CSCD);中国科技论文与引文数据库(CSTPCD);
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A Device for Simulating Soil Nutrient Extraction and Plant Uptake

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