Effect on Photosynthetic Characteristics of Korla Fragrant Pear in Fruit Enlargement Stage under Different Organic Materials

The diurnal variation curves of photosynthetic characteristics of fruit enlargement stage of korla fragrant pear under different organic materials were measured by portable photosynthesis system CIRAS-2 in the field conditions. The results showed that the diurnal variation curves of Pn of Korla Fragrant Pear presented double-apex curves,and had a phenomenon of photosynthetic‘noon breaking'. The diurnal variation curves of Gs and Ls were same as Pn,they also showed double-apex curves. The diurnal variation curves of Ci were contrary with Pn,they showed double-valley curves. The diurnal variation curves of Tr presented single-apex curves,but the diurnal variation curves of WUE showed single-valley ones. It could cause obvious impacts on Chl content,LAI and photosynthetic characteristics of Korla Fragrant Pear to apply organic materials in soil. It can improve the Chl content,LAI,Pn,Tr,Gs and WUE of Korla Fragrant Pear to apply biological black carbon and sheep excrement in soil. The effect of fertilizer to Chl content,LAI,Pn,Tr and Gs of Korla Fragrant Pear were in order of sheep excrement biological black carbon,but WUE of Korla Fragrant Pear was in order of biological black carbon sheep excrement.