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With the rapid of economic development in coastal areas, the pressure of population growth,and the contradiction between shortage of the land resources and the space resources become sharper and sharper. Reclamation of the ocean has become an important way to develop lands¡¯ area and space, ease the contradiction between humanity and land. In the Netherlands, about 7000 km2 of land area was made from ocean reclamation in past 800 years. In many countries such as Japan, Korea, and American, reclamation of the ocean had also quite big promotion effect to the urbanization of coastal regions. In China, take the Pearl River Delta area as an example, where was our experiment sampling points, as much as 600 km2 coastal wetlands have been reclaimed since 1981. However, the coastal tidal flat is also one of the main sinks for heavy metals resulting from adsorption and sedimentation (Williams et al., 1994). On the basis of our prior studies [QuSheng Li, ZhiFeng Wu, et al, 2007; QuSheng Li, Bei Chu, Lei Shi, et al, 2007.], tidal flat soil in Pearl River estuary is contaminated gravely by heavy metals. This presents a health risk because the heavy metals in sediments may enter crops when the tidal flats are reclaimed.......Previous study showed that Pb and Cd in reclaimed tidal flat soils were mainly in exchangeable forms, account for 38.3% and 43.2% of totals respectively. And the contaminated region of soil profile begins at the top of the soil to more than 1 meter depth. Whereas such circumstances, soil leaching can be conducted in situ to reduce the threats from heavy metals.
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w1l203

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phu_grassman: ½ð±Ò+2, Thanks for your answer. 2012-10-23 08:31:41
ÆÆÓ´¿©: ½ð±Ò+10, ·­ÒëEPI+1, ¡ïÓаïÖú 2012-10-23 14:13:18
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With the rapid of economic development in coastal areas, the pressure of population growth,and the contradiction between shortage of the land resources and the space resources become sharper and sharper. Reclamation of the ocean has become an important way to increase lands¡¯ area and space, ease the contradiction between humanity and land. In the Netherlands, almost 7000 km2 of land area was made from ocean reclamation in past 800 years. In many countries such as Japan, Korea, and American, reclamation of the ocean had also quite big promotion effect to the urbanization of coastal regions. In China, take the Pearl River Delta area as an example, where was our experiment sampling points, as much as 600 km2 coastal wetlands have been reclaimed since 1981. However, the coastal tidal flat is also one of the main sinks for heavy metals resulting from adsorption and sedimentation (Williams et al., 1994). On the basis of our prior studies [QuSheng Li, ZhiFeng Wu, et al, 2007; QuSheng Li, Bei Chu, Lei Shi, et al, 2007.], tidal flat soil in Pearl River estuary is contaminated gravely by heavy metals. This bings a health risk because the heavy metals in sediments may enter crops when the tidal flats are reclaimed.......Previous study showed that Pb and Cd in reclaimed tidal flat soils were mainly in exchangeable forms, account for 38.3% and 43.2% of totals respectively. And the contaminated region of soil profile begins at the top of the soil to more than 1 meter depth. Whereas such circumstances, soil leaching can be conducted in situation to reduce the threats from heavy metals.
2Â¥2012-10-23 00:01:38
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2Â¥: Originally posted by w1l203 at 2012-10-23 00:01:38
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With the rapid of economic development in coastal areas, the pressure of population growth,and the contradiction between shortage of the land resources and t ...

3Â¥2012-10-23 00:09:29
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phu_grassman

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ÆÆÓ´¿©: ½ð±Ò+40, ¡ïÓаïÖú 2012-10-23 14:13:26
with the rapid economic development in coastal areas, the pressure of population growth grows higher(high pressure,ËùÒÔÓÃhighÀ´ÐÞÊÎѹÁ¦±È½ÏºÃ) and higher and the contradiction between shortage of £¨¸´ÊýÐÎʽ£¬Ç°Ã涨¹Ú´Ê¿É²»Òª£©land resources and space resources becomes sharper and sharper. Reclamation of the ocean has become an important way to expand(À©ÕÅÍÁµØ) land and space(ÍÁµØºÍ¿Õ¼ä)£¬ easing(Ó¦Ó÷ִÊÐÎʽ) the contradiction between humanity and land. In Netherlands(¹ú¼ÒÇ°Ãæ²»Óö¨¹Ú´Êthe),about 7000 km2 of the£¨¼Ó¶¨¹Ú´Ê°É£© land area was made from ocean reclamation in the past 800 years£¨ÔÚ¹ýÈ¥µÄ¼¸ÄêÀin the past 800 years, the²»¿ÉÊ¡ÂÔ£©. In many countries such as Japan, Korea, and America£¨AmericanÊÇÖ¸ÈË»òÓïÑÔ£©, reclamation of the ocean greatly promoted the urbanization of coastal regions. In China, taking(·Ö´ÊÐÎʽ) the Pearl River Delta area as an example, which£¨Òýµ¼¶¨Óï´Ó¾ä£¬ÔÚ¾ä×ÓÖг䵱Ö÷ÓËùÒÔ²»ÄÜÓÃwhere£© was our experimental£¨ÐÎÈÝ´Ê£© sampling site£¨ÊµÑ鵨µã£©, as much as 600 km2 coastal wetlands have been reclaimed since 1981. However, the coastal tidal flat is also one of the main sinks for heavy metals resulting from adsorption and sedimentation (Williams et al., 1994). On the basis of our prior studies [QuSheng Li, ZhiFeng Wu, et al, 2007; QuSheng Li, Bei Chu, Lei Shi, et al, 2007.], tidal flat soil in Pearl River estuary is contaminated gravely by heavy metals. This poses a health risk because the heavy metals in sediments may enter into crops when the tidal flats are reclaimed.......Previous study showed that Pb and Cd in reclaimed tidal flat soils were mainly in exchangeable forms, accounting(·Ö´ÊÐÎʽ) for 38.3% and 43.2% of the total, respectively. And the contaminated region of soil profile begins from(´ÓÄĵ½ÄÄ) the top of the soil to more than 1 meter depth. Whereas in such circumstances, soil leaching can be conducted in situ to reduce the threats from heavy metals.
4Â¥2012-10-23 08:31:09
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