Abstract:

In order to clarify the influence of meteorological factors on potential productivity, the key factor was found which restricted crop growth, based on the meteorological data in the last 50 years in southwestern Shandong Province, by using linear-trend method, the climate change trends and potential productivity were analyzed, respectively.The results showed that the temperature increased with a change rate by 0.16℃/10 a, the annual precipitation was no obvious change with a change rate by 3.0 mm/10 a, the annual sunshine duration decreased with a change rate by 112.05h/10a.The photosynthetic, the photo-temperature and the photo-temperature-water potential productivities were estimated, which reached at 22.6×104 kg/hm2, 17.6×104 kg/hm2 and 7.4×104 kg/hm2 respectively. The trend of the climatic potential productivity in the last 50 years showed that the photosynthetic and the photo-temperature potential reduced generally, but the reduced trend of the photo-temperature-water potential was not significant. The temperature had negative effect on potential climate productivity, while precipitation had positive effect, prefer to temperature, the water was the key factor of restricted climatic potential productivity.