Characteristics of leaf element contents for eight nutrients across 660 terrestrial plant species in China Relationships between foliar stable carbon isotope composition and environmental factors and leaf element contents of Pinus tabulaeformis in northwestern China Studies on the Characteristic of Element Contents in the Dominant Plant Species of the Threegorges Region in China Chemical Element Contents in Leaves of 16 Dominant Species from Evergreen Broad-leaved Forest at Nanling Nature Reserve Studies on the characteristics of element contents of altifrigetic subnival vegetation at the source area of Urumqi River Characteristics of Element Contents in Plant Species of the Karakorum and Kunlun Mountains The Content Levels of Chemical Elements of Plants in the Castanozems Typical Steppe Zone of Nei Monggol Effects of exogenous nitric oxide on photosynthetic, bioluminescent characteristics and mineral element contents in tomato under copper stress