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一、柑桔气候、土质、水分是影响柑桔生长发育的主要外界因素,地理上最冷月(可能是年均温—译者)15℃等温线是柑桔栽培的极限,这些地方约与地球南北纬35～40°相一致。赤道附近柑桔可在海拨2000公尺的地方生长,这一高度年均温约比海平面低10℃,即大约17℃。但热带地区气候平稳,这点和亚热带地区气候变化不定大不相同,因此不能只用年均温来衡量柑桔对气候的需求。
First, the citrus climate, soil, water is the main external factors that affect the growth and development of citrus, the coldest month (may be the annual average temperature - translator) 15 ℃ isotherm is the limit of citrus cultivation, these places about Earth’s latitude 35 ~ 40 ° consistent. Citrus near the equator can grow up to 2,000 meters above sea level, an average annual temperature of about 10 ° C below sea level, or about 17 ° C. However, the climate in the tropics is stable, which is not the same as that in the subtropical regions. Therefore, the annual average temperature can not be used to measure citrus demand for climate.