Leaf functional traits of four typical forests along the altitudinal gradients in Mt. Shennongjia Leaf anatomical characteristics of the plants of grasslands in the Tibetan Plateau Plant specific leaf areas of Cyclobalanopsis glauca-Pteroceltis tatarinowii community in karst region, northern Guangxi The relationship between the content of cotton leaf chlorophyll and waxiness and leaf thickness and the cotton resistance to Apolygus lucorum