Let us make an in-depth study of the units of vegetation. After reading this article you will learn about: 1. Plant Communities and 2. Plant Formations. Plant Communities: Individual plants (the same is true for animals, including man) growing in the open under more or less natural conditions tend always to associate together in communities—plant communities. Each community has its [...]
According to Ecological Society of America (1952), "grassland is a community dominated by grasses or grass-like plants". Approximately 24 percent of total vegetation cover is grassland. Grasslands occupy about 45.0 million sq. km. area throughout the world in the tropics, temperate and alpine regions (Shantz, 1954). Natural grasslands occur in temperate zones with annual rainfall 25 to 80 cm, while [...]
Earth is a spherical planet of the solar system. It is differentiated into three main layers—crust, mantle and core. The core is the central portion of the earth containing nickel and iron in molten or vaporized state. This is about 3470 km from the centre. The mantle is the middle layer of the earth which extends about 2900 km above [...]