Showing papers on "Undergrowth published in 1964"
01 Jan 1964
TL;DR: The present paper is to substantiate through experiments and investigations the senior author's patient observation on red-pine forests in Korea and his presumption that thered-pine tree be secreting substances inhibiting the germination and growth of different species.
Abstract: The vegetation under Pinus and Abies is, as we usually observe, thin and sparse. But we fail to realize the repulsive effects with which Pinus and Abies work against the natural growth of a fair number of other species, because we generally attribute this to the insufficient light, or become confused with a few different species growing there. A frank evidence in this regard is the phenomenon that weeds which grow thick in crop field cannot invade the adjoining red-pine forest where the light condition is thought rather favorable because of a relative light intensity of 28 to 35 °o with the thin canopy. A closer, continuous observation will discover that some plants in the undergrowth of pine trees lead but an abnormal life, flowerless or barren. Hereupon we recall Knapp'sl' emphasis on the importance of chemical secretion of plants in the experimental sociology, and Bonner's chemical sociology among the plants2' . Such interaction between two plants through chemical secretion was named by Molisch3' allelopathy. Recently a comprehensive review on allelopathy, or chemical influences of other plants was given by Evenari4>, and the details will be discussed later. The present paper is to substantiate through experiments and investigations the senior author's patient observation on red-pine forests in Korea and his presumption that the red-pine tree be secreting substances inhibiting the germination and growth of different species. To remark parenthetically, 60 to 70% of the forest land in South Korea is occupied with red-pine trees, developing a thin, sparse vegetation as well.
32 citations
TL;DR: The distribution and biology of Lophuromys flavopunctatus Thomas in Nyasaland is given, the species was always found in areas which at one time supported broad-leaved evergreen forest, the favored habitat being dense undergrowth at the edge of forest.
Abstract: An account is given of the distribution and biology of Lophuromys flavopunctatus Thomas in Nyasaland. Comparative study revealed differences between populations in the north and south of Nyasaland. The species was always found in areas which at one time supported broad-leaved evergreen forest, the favored habitat being dense undergrowth (bracken scrub) at the edge of forest. It may be active at all hours but is chiefly nocturnal. Population structure, seasonal fluctuations in numbers, reproductive condition and color change were analyzed for the period March 1962 through May 1963. Breeding took place only during the warm wet season between October and early May; litter size varied between one and 4, three being the most usual. Data on the feeding habits, disease rate and parasites are presented. Lophuromys feeds chiefly upon insects and worms and does not usually excavate tunnels. About 9% of the specimens trapped were diseased, the disease rate being highest during the wet season.
23 citations