The experiment of sowing by stages can develop different conditions of climate change for maize （Zea mays ） growth in natural fields. Using method of statistic analyses, effect of climate change on maize growth and yield was researched according to 6 years＇ data of the experiment of sowing by stages in the middle of the maize belt of the Northeast China. Here climate change indicated mainly changes of temperature and humidity. The seedling emergence rate, growth rate, filling process, and accumulation of dry matter were indications of the situation of maize growth.
Changes of air temperature and humidity can influence obviously vegetative and reproductive growth and production of maize. Under the conditions of normal moisture, if air temperature stage of maize; about 6 days and 4 days will be reduced during rises 1 ~C , there will be 3 days ahead of time in sprouting the period of seedling emergence to tasseling stage and tasseling to mature stage respectively; the seedling emergence rate and growth rate after sprouting stage will increase by 17%. If relatively cumulative temperature increases by 10%, relative dry weight of 100 grains of maize will increase by 13 %. However, filling time will shorten obviously and grain weight will lighten if air humidity is low during filling period. If cumulative temperature of main growing season increases by 100 ℃· d, per unit area yield of maize will increase by about 6.3% ; and if mean temperature rises 1 ℃ during the period of tasseling to mature stage, per hectare yield of maize will increase by about 550 kg; but if aridity index increases 0.1 during the same time, per hectare yield will decrease about 860 kg. When temperature is above 22 ℃during the period of tasseling to mature stage, if aridity index is between 0.75 and 0. 9, maize yield will reach to the maximum, that means that cooperation between higher temperature and larger humidity is favorable to maize filling and mature and yield increase.
Under the conditions of suitable moisture, climate war
Acta Ecologica Sinica
maize （ Zea mays ）
experiment of sowing by stages
growth and yield
Northeastern of China