首页|A Device for Simulating Soil Nutrient Extraction and Plant Uptake

A Device for Simulating Soil Nutrient Extraction and Plant Uptake

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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.

available nutrientsconventional chemical extractionion exchange membranelow pressure systemsoil nutrient evaluation

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

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

国家自然科学基金国家自然科学基金National Basic Research Program (973 Program) of ChinaPh.D. Programs Foundation of Ministry of Education of ChinaFoundation for High-Level Talents in Higher Education of Guangdong,ChinaPreferred Foundation for Returned Scholars,Ministry of Personnel of China

31071847311720262007CB109303201044041100162010412

2012

土壤圈(英文版)
中国土壤学会,中科院南京土壤研究所和土壤与农业可持续发展国家重点实验室

土壤圈(英文版)

CSTPCDCSCDSCI
影响因子：0.477
ISSN：1002-0160
年,卷(期)：2012.22(6)
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