Our objective was to identify combinations of irrigation and fertiliser application that promoted
the photosynthetic productivity and water use efficiency (WUE) of Catalpa bungei. Using response surface
methodology based on a rotatable central composite design, we conducted a pot experiment with C. bungei
clone 004-1 seedlings. The experiment quantified the effects of interactions between soil water content
(W), nitrogen application rate (N), and phosphorus application rate (P) on leaf net photosynthetic rates
(Pn), SPAD values (SPAD-502 meter readings of leaf chlorophyll), and carbon isotope composition
(δ13C). N had significantly positive effects on the all three leaf parameters, while W had significantly negative
effects on leaf δ13C signatures but positive effects on leaf Pn and SPAD values. The magnitude of the N
effect exceeded that of the W effect. P had no significant effects on any of the three leaf parameters. The W
× N interaction had significant positive effects on Pn and SPAD, but significant negative effects on leaf δ13C.
Thus, irrigation and nitrogen application had different effects on seedling growth and WUE, and the two
effects were interactive. Catalpa bungei growth was promoted by appropriately increasing nitrogen application
and irrigation, but WUE was improved by increasing N and decreasing irrigation. Therefore, strategies
for the irrigation and fertilisation of C. bungei plantations should be designed to appropriately balance plant
growth and WUE.
Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies
Informacja
SZANOWNI CZYTELNICY!
UPRZEJMIE INFORMUJEMY, ŻE BIBLIOTEKA FUNKCJONUJE W NASTĘPUJĄCYCH GODZINACH:
Wypożyczalnia i Czytelnia Główna: poniedziałek – piątek od 9.00 do 19.00