Effects of forest gap size and light intensity on herbaceous plants in Pinus koraiensisdominated broadleaved mixed forest. Effects of Forest Gap Size on the Growth of Quercus variabilis Seedlings on North Slopes of The Qinling Mountains Effects of gap size in Pinus massoniana plantations on different soil labile organic carbon fractions Effects of forest gap size on litter recalcitrant components of two tree species in Pinus massoniana plantations