Characteristics of nitrate horizontal transport in a paddy field of the Tai Lake region, China

被引：22

作者：

Chen, XM ^{[1
]}

Shen, QR ^{[1
]}

Pan, GX ^{[1
]}

Liu, ZP ^{[1
]}

机构：

[1] Nanjing Agr Univ, Coll Nat Resources & Environm Sci, Nanjing 210095, Peoples R China

来源：

CHEMOSPHERE | 2003年 / 50卷 / 06期

关键词：

nitrate transport; horizontal column; paddy soil; Tai Lake region;

D O I：

10.1016/S0045-6535(02)00208-4

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The characteristics of nitrate horizontal transport in a major paddy soil, Wu Shan soil in the Tai Lake region, were studied. The concentration of nitrate during horizontal movement decreased with the increasing in distance from the tracer source, the change following a logarithmic function. The concentration of the nitrate was strongly correlated with the soil moisture content, as an exponential function. The horizontal transport velocity of nitrate was significantly correlated with the distance of the tracer source as power function. Therefore, the velocity of nitrate horizontal transport was controlled by the concentration gradient of nitrate, and soil water potential gradient from beginning to the 20 cm mark in the horizontal column. However, the velocity of nitrate horizontal was stable beyond 20 cm, where it was controlled by soil matric potential. (C) 2002 Elsevier Science Ltd. All rights reserved.

引用

页码：703 / 706

页数：4

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