In 2017, the temperature and air relative humidity of open spaces within and around mangrove at Nansha wetland, Guangzhou, and Qi’ao Island, Zhuhai, Guangdong Province were automatic investigated simultaneously every hour for everyday to estimate the ecological effects of mangrove at different habitats. During the whole year, the temperature within the mangrove both at Nansha and Qi’ao were lower than that around it, but the humidity was higher. Within the mangrove at Nansha, the daily maximum decreased temperature was 6.832 ℃ with the mean value of 0.733 ℃ in the average percentage of 3.092%, while the daily maximum increasing humidity was 23.416% with the mean value of 5.528% in the average percentage of 6.345%. Within the mangrove at Qi’ao, the daily maximum decreased temperature was 6.607 ℃ with the mean value of 1.722 ℃ in the average percentage of 7.011%, while the daily maximum increasing humidity was 45.044% with the mean value of 1.681% in the average percentage of 1.942%. For annual mean air temperature within mangrove, there was 0.126 ℃ higher at Nansha than that at Qi’ao, but for open spaces there was 0.862 ℃ higher at Qi’ao than that at Nansha. For annual mean humidity within mangrove, there was 4.427% higher at Nansha than that at Qi’ao, and for open spaces there was 0.581% higher at Nansha than that at Qi’ao. In total, the effects of decreased air temperature and increasing humidity were relative obvious, and much apparent at Qi’ao for decreasing temperature, while much apparent at Nansha for increasing humidity.
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