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An abrupt ecotone in the vicinity of Valparaiso, Indiana, which separates forest communities consisting principally of beech and sugar maple from those dominated by black oak and white oak, coincides with the western margin of the LaPorte, Indiana precipitation anomaly. This ecotone is spatially related to a subsoil texture gradient. but its relationship to the precipitation pattern is doubtful. Tree-ring variation in living tree near LaPorte reveals patterns of cross-dating and climatic correlation which might be expected if the described precipitation pattern is real. Subsident mesoseale air flows (the lake breeze) from Lake Michigan in summer might contribute to occasional unexpected rainfall in northwestern Indiana. [ABSTRACT FROM AUTHOR]

The article deals with the variability in seedling management of sugar maple and the mortality rates of the seedling over the first decade in three climatic regions in Wisconsin. The authors claim that the use of age relationships in the study of plant populations or communities is limited. They add that to be able to determine the probability of a plant individual surviving to the next year, the species being considered should have a stable age distributions. Based on the article, sugar maple has a stable age structure because it has a continuous reproductive input into the youngest age class.

The article presents a study on the botanical conditions of the Morgan Aboretum in southern Quebec Province. One quadrat for each of the three woodland areas were established, where different plant species were measured and listed. Observations showed that in the Fagetum consociation, an area hardly disturbed and locally developed on dry podsolic terrain, the Fagus grandifolia was dominant. The Aceretum sacchari quadrat was generally mixed but unstable and was dominated by sugar maples. The Pinetum strobi-Tsugosum quadrat, a mature woodland located on a raised sandy terrain, was dominated by the Pinus strobus and Tsuga canadensis.

Sugar maple (Acer saccharum Marsh.) seedlings were grown in a nursery for three years in 13, 25, 45 and 100 per cent of full daylight. During the third year of growth, the rates of their apparent photosynthesis and respiration were measured periodically with an infra-red gas analyzer at various light intensities and normal CO2 concentration. In addition, the rates of apparent photosynthesis of a single attached leaf of the same seedlings were measured at saturating light intensity, but varying CO2 concentrations. An increase in the light intensity in which seedlings were grown had no effect on their height or mean leaf area, but resulted in thicker leaves, an increase in the total leaf area per seedling due to an increase in the number of leaves, an increase in the dry weight especially of roots and a decrease in the chlorophyll content of leaves. Throughout the growing season seedlings grown in full daylight, as compared with those grown in lower light intensities, had the lowest rates of apparent photosynthesis measured at standard conditions (21,600 lux light intensity and 300 μl/l of CO2), when this was expressed per unit leaf area, but the highest rates on a per seedling basis. Thus dry matter production attained at the end of the growing season correlated positively with the photosynthetic rate per seedling, but not per unit leaf area. The rates of apparent photosynthesis of seedlings grown at lower light intensities were more responsive to changes in light intensity or CO2 concentration than those of seedlings grown in full daylight intensity. [ABSTRACT FROM AUTHOR]

The article features the maple tree, a woody tree which is numerous in the pavements and sidewalks in the cities of New England. It is considered to be one of the earliest sign of spring in the region which usually appear in February. It is common as a tree shade tree in some of the coasts. The red maple has a polygamous genus. The sugar or rock maple is a superb tree which is delicate, apparently fragile and transitory.

The article offers information on the sugar industry in the U.S. It is claimed that sugar comes from four sources and these are sugar cane, sugar beet, sugar maple and sorghum. However, the great bulk of the world's crop comes from the sugar cane and sugar beet. The part of the U.S. that produce cane are Louisiana, Hawaii, Porto Rico and Philippines. Sugar is also said to be the largest of all American imports.

The article describes the signs of the spring season. The bleeding of certain trees, such as sugar maples, is one of the earliest indications of the season. It is also the time to look out for the Cambernell beauty, Morningbride or Vanessa Antiopa butterfly, aside from the snow-drops and the sparrows.

A list of large trees suitable for street planting is presented. They include basswood tree, sugar maple tree, Norway maple tree, wild black cherry, white oak tree, common chestnut tree, black willow tree, butternut tree and northern pitch pine. Information on the length and width of the trees are also included.

The article offers information related to the maple tree. The rock or sugar maple tree can be found everywhere in the latitude of New England and far to the south. The maple tree is a tree of very erect habit, the head remarkably well balance, assuming various degrees of spread, according to exposure to the winds. The branches naturally strike out low and at sharp angles with the main stem. They are without crooks, maintaining their straight habit to extremities.