Geographic variation of germination, growth, and mortality in sugar maple (Acer saccharum) : common garden and reciprocal dispersal experiments
Bioclimatology ; Biogeography ; Climatic change ; Eastern United States ; Experimentation ; Human impact ; Sugar maple ; Temperature ; United States of America
. Specifically, anthropogenic warming may affect germination success and growth of sugar maple. To evaluate this potential limitation, the AA. address 2 questions. The first involves a growth chamber: Do temperatures at and above (1°, 7°, and 14° C) sugar maple's
If current temperature trends continue and increase as predicted by general circulation models, the persistence and migration of sugar maple (Acer saccharum) at its northern limit will become crucial to its continued existence in North America
optimal germination temperature affect its germination? The second involves a common garden: Do sugar maple germination and subsequent growth and mortality rates show evidence of geographic variation under current climatic conditions?
Between 1907-1909, a large marsh was drained near Albert Lea, Minnesota. In 1922, Dutch people were encouraged to come and grow vegetables and sugar beets on the rich mucklands reclaimed from the marsh. The Dutch cultural presence is still felt
A comparison of the primary production of the leaf of corn, a C specie, and sugar beet, a C specie, is made. Models adapted to these two kinds of plants are developped. The main differences appear to be related to photorespiration and to the CO
transfer process from the cytoplasm of the mesophyll cells to the sites of carboxylation into the chloroplast. More over the C specie presents a better water use efficiency than the C one's. Finally the variations of the net assimilation rate of the leaves
Agrarian structure ; Agrosystem ; Argentina ; Economic history ; Land ; Land tenure system ; Legislation ; Property right ; Rural history ; Social inequality ; Sugar cane ; Tucumán
Agroindustry ; Brazil ; Land tenure system ; Living conditions ; Malnutrition ; Modernization ; Pernambuco ; Regional economy ; Rural outmigration ; Social structure ; State control ; Sugar cane ; Trade union ; Underemployment
(l'agglomération de Port of Spain, l'agglomération de San Fernando et la région pétrolière, la Sugar Belt, l'East Belt). Tobago est traitée à part. Le tome s'achève par une 4 partie qui aborde les problèmes économiques et sociaux du pays (distorsion entre