To study the effects of precipitation change and nitrogen deposition on morphological traits and growth of China's subtropical evergreen broad-leaved forest, we set up a controlled-experiment in Gutian Mountain of Zhejiang province in China with two factors: 1) nitrogen (control and nitrogen addition with dose of 10 g m-2 yearly) and 2) precipitation (natural precipitation as control and reduction of 30 %). We periodically investigated the tree species’ traits of morphology, biomass and their allocation in the following three years.
Results/Conclusions
The results were shown that 1) nitrogen significantly promoted the growth in height , stem basal diameter and biomass of Elaeocarpus sylvestris(Lour.)Poir, Liquidamba formosana and Schima superba, but only increase branch and leaf biomass of Pinus massoniana and branches of Cyclobalanopsis glauca; 2) after two years’ treatment, nitrogen increased leaf weight ratio of S . superba and E . sylvestris , also increased branch weight ratio of L . formosana and C . glauca, decreased leaf weight ratio of C . glauca. With extension of the treatments to theer years, nnitrogen increased stem weight ratio of E . sylvestris, L . formosana and S . superba and branch weight ratio of P . massoniana and C . glauca. The increase of the aboveground weight ratio is at the cost of the decrease of underground weight ratio. Nitrogen reduced the root weight ratio of C . glauca ,S . superba,L . formosana and E . sylvestris; 3) Reducing precipitation through three years significantly promoted the growth in stem base diameter and whole plant biomass of L .formosana, increasing its root weight ratio and root/shoot ratio, reducing its leaf weight ratio.
