|
Base on 27-year(from 1980 to 2006) observations, including meteorological data, grassland yield, height, coverage and phenology, the correlationship between climate factor and grassland condition(yield, height, coverage) was analysed by SPSS and Excel soft, To talk about the effect of climate factor on grassland condition. The results showed:1. By analyzing the caorrelationship between climate factor and grassland yield on the interannual timescale, we can see it indicate remarkable positive correlation between rainfall, sun light, temperature, relative humidity and grassland yield, and negative correlation with ET. At the same time it indicated that rainfall, temperature, and ET is main effect factor on grassland yield by Principal Components Analysis based on SPSS and Excel.2. It indicated remarkable positive relationship between rainfall and yield in May, August and December(P<0.05), and it did not indicate remarkable relationship with other month; it indicated remarkable positive relationship between yield and temperature of January, February, March, April and December; and it showed remarkable negative relationship between yield and ET of May, June, July, August and September.3. Enclosure can improve quality of grassland, including yield, height, vegetation coverage and plant water content etc; climate factor indicated coherence effect on grassland in enclosure and graze; by analyzing the relationship between water content and climate factor, it showed higher correlation with rainfall and temperature, and it indicated negative relationship with ET and wind speed.4. By the research of plant phenology, we can see that the green stage and yellow stage are delaying, and the heading date, Florescence; Seed maturity indicated is not significant variety order.
|