کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6302654 | 1618054 | 2012 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Vertical migration and distribution of added dissolved iron in Carex lasiocarpa marsh soil
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
بوم شناسی، تکامل، رفتار و سامانه شناسی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Vertical migration and distribution of added dissolved iron in Carex lasiocarpa marsh soil Vertical migration and distribution of added dissolved iron in Carex lasiocarpa marsh soil](/preview/png/6302654.png)
چکیده انگلیسی
Irrigating rice paddy fields with groundwater containing iron is standard practice for dry croplands replanted to rice in northeast China. To assess the impact of paddy field drainage on the receiving natural wetlands, vertical migration and distribution of dissolved iron in the soil-plant system with acidic dissolved iron addition were investigated in the Carex lasiocarpa marsh soil columns (diameter 35 cm, height 65 cm) of the Sanjiang Plain. The experiment was designed as four sequential stages: (1) iron-free leaching, (2) neutral iron addition using FeSO4 (100 mg Lâ1 of iron concentration), (3) acidic iron addition using FeSO4 and HCl (200 mg Lâ1 of iron concentration, pH adjusted to 3.56) and (4) iron-free leaching. After the experiment, the iron distribution within a natural wetland ecosystem was quantitatively observed. The results showed that pH and Eh in the soil columns were affected more by water table fluctuations than acidic addition. Effects of iron addition on the dissolved iron in soil solutions decreased with increasing soil depth, and the vertical migration rates in 20-30 cm layer (AG horizon) and 30-50 cm layer (G horizon) were 0.58 and 0.56 mm minâ1, respectively. Doubling the iron addition did not increase the iron in soil solutions significantly. Only a small part of added iron (5.7%) drained out, while the majority was retained in soil (69.4%) and plant biomass (24.8%). Soil manganese and nitrogen were positively affected by acidic iron addition, while the effects on carbon and phosphorus were not significant.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ecological Engineering - Volume 44, July 2012, Pages 36-43
Journal: Ecological Engineering - Volume 44, July 2012, Pages 36-43
نویسندگان
Yuan-chun Zou, Xiao-fei Yu, Xian-guo Lu, Ming Jiang,