Researches on Photosynthetic Efficiency of cassava-peanut Intercropping Impacted by Total Solar Eclipse

Abstract On July 22nd, 2009, the total solar eclipse spectacle occurred in Yangtze River in central China. By setting cassavaand- peanut intercropping, we used LI-6400 to study the diurnal variation of photosynthetic efficiency impacted by total solar eclipse. The results showed that: (1) Diurnal variation of atmospheric temperature (Ta), photosynthetic active radiation (PAR) and field CO2 concentration (Ca) reduced sharply, while atmospheric relative humidity (RH) went up. (2) The intercropping showed a higher resistibility than monoculture did. Bes ides, cassava and peanut showed a different resistibility, which also verified the theory of intermediate disturbance hypothesis. (3) When the total solar eclipse was over, the net photosynthetic efficiency (Pn) of both cassava and peanut demonstrated a similar declining trend, and the resilience of monoculture was stronger than that of intercropping. Furthermore, in monoculture, the resilience of cassava was stronger than that of peanut.