As important items of global change, precipitation pattern change and nitrogen deposition are becoming serious, and have become vital factors influencing the ecological processes of global terrestrial ecosystem (Galloway et al., 2004; Zhou et al., 2012). Forest is a theme of terrestrial ecosystem, which plays an important role in regulating atmospheric CO2 concentration and relieving climate change. Xinyang is located at the transition area between subtropical and warm temperature zone, the unique climatic characteristics and vegetation groups provide an ideal site for studying the response of terrestrial vegetation to global climate change.
The experiment was conducted in a typical deciduous broadleaved forest (Quercus variabilis) since 2016, we simulated decreased precipitation and increased precipitation by artificial precipitation reduction shed and precipitation enhancement pipeline, respectively. The experiment was designed by latin square, all of precipitation enhancement (+50%), precipitation reduction (-50%) and control plot had 3 samples. The sample size was 20 m×20 m, each sample were divided into two halves, one half were carried out with nitrogen deposition (50 kgNha-1year-1).
Lei Su, Yanchun Liu, Xiaoya Li, Shiqiang Wan