OBJECTIVE FORESTRY

Detailed explanation-1: -The correct answer is Pore Space. Pore Space: Porosity or pore space refers to the volume of soil voids that can be filled by water and/or air. It is inversely related to bulk density .

Detailed explanation-2: -Pore space is defined by porosity of a material possessing free space between the mineral grains, expressed as percentage (Rebollo et al., 1996), and depends on size and sorting of the particles as a cubic or hexagonic package.

Detailed explanation-3: -Water-filled pore space (WFPS) is the ratio of volumetric soil water content to total soil porosity. A soil’s WFPS is determined simply from its bulk density and moisture content, because particle and water densities are stable at  2.6 and 1 kg/l respectively. Preferred Units: percent.

Detailed explanation-4: -Porosity is the percentage of void space in a rock. It is defined as the ratio of the volume of the voids or pore space divided by the total volume. It is written as either a decimal fraction between 0 and 1 or as a percentage. For most rocks, porosity varies from less than 1% to 40%.

Detailed explanation-5: -Furthermore, in the ideal soil, half of the pore space would be macropores (air filled) and half would be micropores (water filled) because the grass roots need both air and water to survive. The micropores hold the available water for the plant roots, while the macropores allow gravitational water to drain through.