To explore coupled management mode of water and light intensity for tropical economic crop-coffea arabica L. tree, the effects of irrigation and light intensity levels on light response curve, photosynthetic, transpiration, stomatal conductance and others indexes are studied on coffea arabica L. leaf by using three levels of irrigation(WH-high water content level, WM-moderate level, WL-low water)and three levels of light intensity(S0-no shading, S1-slight shading, S2-severe shading). The results show that the effects of shading on the chlorophyll content and carotenoid pigment in coffea arabica L leaf are greater than those of irrigation. Compared with no shading, an increased shading intensity can raise the total chlorophyll and chlorophyll b by 13. 53%-260. 21% and 31.10%-412.91%, respectively. Compared with the low water content level, an increased irrigation level can increase the chlorophyll a, and b, total chlorophyll by 13.30%-110.65%, 92.11%-148.36% and 39.85%-124.30%, respectively, under non-shading and slight shading conditions. Compared with the low water content level, an increased irrigation level can increase the maximum net photosynthetic rate under no shading and slight shading conditions; under severe shading condition, however, the maximum net photosynthetic rate on longer increases with the increasing irrigation level steadily. Compared with the low water level, the increased shading degree can increase the maximum net photosynthetic rate by 10.73%-103.73%. The diurnal variations of net photosynthetic rate, transpiration rate and stomatal conductance all exhibit a double-peak curve under different irrigation and light intensity conditions. Compared with the no shading case, the increased shading degree can increase the net photosynthetic rate and stomatal conductance by 12.36%-57.4% and 4.56%-42.66%, respectively, unfortunately the daily transportation rate is deduced significantly. Compared with the low water level case, an increased irrigation level can substantially increase the average stomatal conductance and net photosynthetic rate. The highest water and light use efficiencies and the maximum net photosynthetic rate are achieved at a high water level and under slight shading condition. Thus the combination S1WH is the best for efficient use of water and light for coffea arabica L. leaf.
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