Journal of Environmental Science and Engineering A 7 (2018) 180-188
nbcc画晴doi:10.17265/2162-5298/2018.04.004
金史
Influence of Percolation Patterns and Soil Copper Concentration on Copper Uptake, and Growth and Yield with Copper-Polluted Stratified Paddy Fields
表达的近义词
Jinhun Fan1, Choichi Sasaki2, Chihiro Kato2, Nobuhiko Matsuyama2, Takeyuki Annaka3, Akira Endo2 and Songtao Li1
1. The United Graduate School of Agricultural Sciences, Iwate University, Morioka 020-8550, Japan
2. Faculty of Agriculture and Life Science, Hirosaki University, Hirosaki 036-8561, Japan
3. Faculty of Agriculture, Yamagata University, Tsuruoka 997-8555, Japan
Abstract: Copper (Cu) was designated as a specific substance in the Agricultural Land Soil Pollution Prevention Act in Japan. It has been known that high Cu concentrations in soil layers reduce rice crop production and thus agricultural practices such as soil dressing have been applied to minimize the damages to crops by copper pollution. In this study, authors investigated the effects of percolation patte
rns of the under-plowsole and subsoil on growth and yield, and copper uptake of paddy rice. Six stratified paddy field models were constructed to conduct the growth tests under the condition in which the percolation patterns of the under-plowsole and subsoil were in an open and clod system. The models have a plow layer (10 cm thickness) and upper-plowsole (2.5 cm thickness) made with 12.5 cm-thickness of non-polluted soil dressing (3.7 mgCu∙kg-1) and an underlying 15 cm-thickness of polluted under-plowsole (7.5 cm thickness) and subsoil who Cu concentration was higher or lower than Japane safety standard (approximately 100 mgCu∙kg-1, 150 mgCu∙kg-1 and 500 mgCu∙kg-1, respectively). During the tests, a constant water-ponding system was adopted, and mid-summer drainage was not done. As a result, Cu concentrations of the rice grains were 5% significantly higher in the open system percolation models regardless of the original amount of Cu in the under-plowsole and subsoil. On the other hand, authors did not recognize any significant differences in growth and yield of rice plants among the models. Authors concluded that the Cu concentrations in rice plants are affected by percolation patterns of polluted plowsole and subsoil even though they are covered with non-polluted soil dressing layers.
车库租赁合同范本
Key words: Copper, rice plant, percolation patterns, soil dressing.
1. Introduction
Soil contamination by heavy metals is a threat to our health and crop production. In Japan, experiences of rious pollution, such as Itai itai dia caud by cadmium (Cd), caud the waking of the laws which were to prevent heavy metal pollution in 1970’s. Cadmium and copper (Cu) are reprentative of specific substances for regulation [1].
It has been reported that an excess of Cu in soil results in poor growth of rice plants and the upper limit of Cu in soil is specified as 125 mg∙kg-1 [2, 3]. In
汤圆的传说
乌龙茶种类Corresponding author: Choichi Sasaki, Ph.D., rearch field: agricultural land engineering. Japan, it is recognized that the history of pollution problems started from Ashio copper mine mineral pollution along Watara River in 1890s. In the 20th century, Japan experienced vere agricultural land contamination caud by the u of mine waste water for agriculture. It took a long time and made much sacrifice to specify the substances which caud the contamination.
当然的近义词For Cd and Cu contamination in agricultural lands, mixing tillage and soil dressing have mainly been conducted [1, 4]. The adoption of a ponding water condition during growing period has also been recommended in order to minimize Cd ad Cu uptake
since solubility of the substances decreas under a
