Interactive effects of soil temperature and moisture on Concord grape root respiration

摘要: Root respiration has important implications for understanding plant growth as well terrestrial carbon flux with a changing climate. Although soil temperature and moisture often interact, rarely have these interactions on root been studied. This report is the individual combined effects of respiratory responses single branch roots 1-year-old Concord grape (Vitis labruscana Bailey) vines grown in greenhouse. Under moist conditions, increased exponentially to short-term (1 h) increases between 10 degrees C 33 C. Negligible occurred 38 By contrast slowly decreasing Q10 from increases, when were exposed constant temperatures 3 d, 30 diminished steeply an increase temperature. Above C, declined Membrane leakage was 89-98% higher nitrogen concentration about 18% lower 35 d than those 25 15 There strong interaction combination elevated drying. At low (10 C), little influenced by drying, while at moderate high (20 exhibited rapid declines decreases moisture. Roots drying also membrane reduced N. These findings acclimation are modelling under different regimes.