کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8487897 | 1552066 | 2014 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Understanding and analysing spatial variability of nitrous oxide emissions from a grazed pasture
ترجمه فارسی عنوان
درک و تجزیه و تحلیل تغییرات فضایی انتشار اکسید نیتروژن از یک مرتع پرورش یافته
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کلمات کلیدی
تنوع فضایی، اکسید نیتروژن، مرتع گاو
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
علوم زراعت و اصلاح نباتات
چکیده انگلیسی
The distribution of the sample mean remained skewed even up to 40 chambers per sample. However, the standard deviation and the 95% confidence interval reduced with increasing numbers of chambers. For random sampling with 16 chambers there was a 95% chance that the sample mean would be within â62% to 109% of the true mean. Stratifying the sampling, either by plot, urine patch/non-urine patch, or both factors combined reduced the skewness and narrowed the 95% confidence interval of the mean. The greatest improvement was seen with the combined plot/urine stratification. Stratifying by urine/non-urine patch produced a greater improvement than stratifying by plot. Therefore if it is possible to identify either urine patches or regions of high N2O production potential accurately then sampling errors could be reduced using a stratified sampling scheme. However, care would be needed to ensure that systematic errors were not introduced.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Agriculture, Ecosystems & Environment - Volume 186, 15 March 2014, Pages 1-10
Journal: Agriculture, Ecosystems & Environment - Volume 186, 15 March 2014, Pages 1-10
نویسندگان
Donna L. Giltrap, Peter Berben, Thilak Palmada, Surinder Saggar,