کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4389595 1618035 2014 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Phosphorus budget and land use relationships for the Lake Okeechobee Watershed, Florida
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک بوم شناسی، تکامل، رفتار و سامانه شناسی
پیش نمایش صفحه اول مقاله
Phosphorus budget and land use relationships for the Lake Okeechobee Watershed, Florida
چکیده انگلیسی

Eutrophication of Lake Okeechobee in southern Florida has been a great concern for decades. Previous studies in the Lake Okeechobee Watershed indicate that net phosphorus (P) import was primarily in the form of pasture fertilizers and dairy feeds, whereas total P export was primarily in the form of milk, cows, and crops. This study is an update of P import and export analyses in the Lake Okeechobee Watershed. The net import P coefficient obtained from the budget analysis was applied to the appropriate land use area for calculating a basin-wide P budget using a Geographic Information System (GIS). The runoff P was estimated with the Watershed Assessment Model (WAM). The P loads to the lake were simulated at discharge structures from each basin. On-site P storage and wetland assimilation values were estimated using a mass balance approach for each basin. Overall, there was a 25% decrease in net P imports and a 29% decrease in onsite P storage, as compared to the previous analyses. The differences in the net P coefficients relative to previous P budgets may be partially the result of better available information. The net P imports for improved pasture increased by 15%, primarily due to the land application of residuals, which had not been included in the previous P budgets. The increase in P import for citrus production may have resulted from changed coefficients in the Lake Istokpoga and Upper Kissimmee regions where citrus was previously found to be a net P exporter. These results indicate that nutrient management practices may have played a role in reducing P loads to the Lake.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ecological Engineering - Volume 64, March 2014, Pages 325–336
نویسندگان
, , , , , ,