Different responses of ecosystem carbon exchange to warming in three types of alpine grassland on the central Qinghai-Tibetan Plateau.

摘要: Climate is a driver of terrestrial ecosystem carbon exchange, which an important product function. The Qinghai-Tibetan Plateau has recently been subjected to marked increase in temperature as consequence global warming. To explore the effects warming on exchange grassland ecosystems, we conducted whole-year experiment between 2012 and 2014 using open-top chambers placed alpine meadow, steppe, cultivated central Plateau. We measured gross primary productivity, net CO 2 (NEE), respiration, soil respiration chamber-based method during growing season. results show that after 3 years warming, there was significant stimulation assimilation emission but both these processes declined steppe grassland. Under conditions, water content more stimulating meadow than temperature. In negatively correlated with exchange. found ambient significantly magnitude warming-induced change NEE. high moisture condition, positive effect NEE, while it negative under low condition. Our highlight NEE have responses warming; reclamation, natural would subject loose C warmer Therefore, future overextension should be avoided scientific planning achieved.