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土壤圈(英文版). 1995, (02)

Nitrogen Mineralization Potentials of Upland Soils inCentral ChinaEnglish Full Text

(CHEN JIA-ZHOU and QIN HUA-CHANG)(Department of Soil and Agrochemistry, Huazhong Agricultural University, Wuhan 430070 (China)

Abstract: Nitrogen mineralization potentials of 15 soil samples were studied by the methods of soil asrobic incuba-tion, and the correlation between the potentials and the amounts of nitrogen taken up by rye grass （Lolium.multifiorum Lam.） in pot culture was calculated. The soils were collected from Hubei Province in Cen-tral China. Soil nitrogen mineralization potentials （NO） were calculated and optimized by a quick-BASICprogram. NO ranged from 60 mg kg￣（-1） to 340 mg kg￣（-1）, which accounted for 9.1% to 34.6% of the totalnitrogen content. Among the examined soils, yellow-brown soil collected from Wuhan had the largest NOand brown-red soil from Xianning had the smallest one. The mineralization rate constants （k） ranged from0.00556 d￣（-1） to 0.01280 d￣（-1） , in average 0.00882 d￣（-1） . Chao soil from Wuhan had the greatest k while yellow-cinnamon soil from Zhaoyang had the smallest one. There were apparent differences between mineralizationparameters （NO and k） optimized and non-optimized ones. Optimized NO had a better correlation thannon-optimized NO with the amount of nitrogen accumulated in the aerial parts of rye grass. NO , NO × k andNt（accumulated mineralized nitrogen within time t） could be used as indexes of soil nitrogen supply. Amongthem Nt was the best, which was significantly correlated with the amounts of nitrogen accumulated in theaerial parts of rye grass harvested at three different times.
Keywords：

aerobic incubation; nitrogen mineralization potential; parameter optimization; upland soil;

  • Series：

    (D) Agriculture

  • Subject：

    Fundamental Science of Agriculture; Agronomy

  • Classification Code：

    S153

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