Abstract:

Based on linear trend analysis and correlation analysis, we studied the height, coverage, yield, turning green period and yellow withering period of herbage and the influencing factors of climate change on herbage in Qinghai. The results show that the height and coverage of forages increase at different rates from July to August, the herbage production increases at different rates in June and July. The herbage production presents a decreasing trend in August. The rejuvenation period is advanced at a rate of -0.65 d/10 a. The yellow withering period is delayed at the rate of 0.15 d/10 a. The growth period of herbage is prolonged. In Banma, Gande, Jiuzhi, Maqên, Haiyan, Qingshuihe, Tianjun and Tongde, the growing period of herbage is extended, and in other areas, the growing season is shortened. Winter temperature, temperature in late June and wind speed in August are the main factors influencing herbage in the Tuotuo River area. Evaporation in September, the minimum air temperature in autumn and the accumulated temperature in June ≥10℃ are the main factors affecting herbage in Gande area. The air temperature, the ground temperature of 0cm in February and the accumulated temperature of ≥0℃ in September are the main factors affecting the forage in Tianjun area.

Key words: herbage, Qinghai, climate change, response, growth season, linear trend