In residential developments, trees shall be planted throughout the site at a rate of one tree per 2,500 square feet of upland lot area or a fraction thereof. In nonresidential development, trees shall be planted throughout a site at a rate of one tree per 2,500 square fee of upland green space, or a fraction thereof. Of this quantity 60% shall be shade trees of 2.5 to 3.0 inches caliper and/or evergreen trees at 10 to 12 feet in height, and 40% shall be shade trees, a minimum of two to 2.5 inches caliper and/or evergreen trees at six to eight feet in height. Existing, mature upland forests (containing a predominance of four inches in diameter at breast height dbh) at the approval of the Township Landscape Architect (which are preserved and adequately protected and not injured during, and subsequent to, construction) may be deducted from the quantity of trees required at the rate of one tree for every 2,000 square feet of mature upland forests.