Effect of Different Organic Materials on Photosynthetic Characteristics at Fruit Setting Stage of Korla Fragrant Pear
Representative Korla fragrant pear (Pyrus bretschneideri) trees with low fertility were selected to be applied 3 different contents of biological black carbon and sheep excrement under field condition. The diurnal variation of photosynthetic characteristics at its fruit setting stage was measured by portable photosynthesis system CIRAS -2. The results showed that the diurnal variation curve of leaf net photosynthetic rate (Pn) presented double-apex with a phenomenon of photosynthetic "noon breaking". The diurnal variation curves of stomatal conductance (Gs) and stomatal limitation value ( Ls ) also showed double-apex. The diurnal variation curve of intercellular CO2 concentration (Ci) showed double-valley. The diurnal variation curve of leaf transpiration rate (Tr) presented single-apex while that of water use efficiency (WUE) presented single-valley. The results showed that organic materials applied in soil could impact obviously on Chl content, leaf area index (LAI) and photosynthetic characteristics. Chl content, LAI, Pn, Tr, Gs and WUE were improved by both biological black carbon and sheep excrement. The fertilizer effects on Chl content , LAI and photosynthetic characteristics were sheep excrement > biological black carbon.
NETL
NSTL
万方数据
维普
