сервис вопросов и ответовдоклад на тему flowers, the influence of plants с переводом заранее спасибо
5-9 класс|
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Maksim322
20 янв. 2015 г., 16:28:46 (9 лет назад)
Irinalog12312
20 янв. 2015 г., 19:00:26 (9 лет назад)
Abstract
The primary objective of this study was to clarify the influence of crop plants on atmospheric methane (CH4) in an agriculture-dominated landscape in the Upper Midwest of the United States. Measurements were carried out at two contrasting scales. At the plant scale, CH4 fluxes from soybean and corn plants were measured with a laser-based plant chamber system. At the landscape scale, the land surface flux was estimated with a modified Bowen ratio technique using measurements made on a tall tower. The chamber data revealed a diurnal pattern for the plant CH4 flux: it was positive (an emission rate of 0.4 ± 0.1 nmol m-2 s-1, average of soybean and corn, in reference to the unit ground area) during the day, and negative (an uptake rate of -0.8 ± 0.8 nmol m-2 s-1) during the night. At the landscape scale, the flux was estimated to be 14.8 nmol m-2 s-1 at night and highly uncertain during the day, but the available references and the flux estimates from the equilibrium methods suggested that the CH4 flux during the entire observation period was similar to the estimated nighttime flux. Thus, soybean and corn plants have a negligible role in the landscape-scale CH4 budget.
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The climate in Great Britain is generally mild and temperate due to the influence of the Gulf Stream. The south-western winds carry the warmth and moisture into Britain. The climate in Britain is usually described as cool, temperate and humid.
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тема или топик (кто как называет)
на тему keeping fit 15-20 предложений можно короткие
заранее спасибо=)
просто срочно надо
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