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cje ›› 2012, Vol. 31 ›› Issue (07): 1633-1638.

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Distribution characteristics of soil temperature within and outside a subtropical evergreen broadleaved forest in Ailao Mountains, Yunnan Province of Southwest China.

YU Lei1,3, ZHANG Yi-ping1,2**, SHA Li-qing1,2, TAN Zheng-hong1, SONG Qing-hai1,3, ZHOU Wen-jun1,3, WU Chuan-sheng2   

  1. (1Key Laboratory of Tropical Forest Ecology (Xishuangbanna Tropical Botanical Garden), Chinese Academy of Sciences, Kunming 650223,  China; 2Ailaoshan Station for Subtropical Forest Ecosystem Studies, Chinese Academy of Sciences, Jingdong 676209, Yunnan, China; 3Graduate University of Chinese Academy of Sciences, Beijing 100049, China)
  • Online:2012-07-10 Published:2012-07-10

Abstract: Soil temperature is an important environmental factor of forest climate, which closely relates to plant growth. To deeply understand the variations of soil temperature in forest is beneficial to reveal the functions of forest ecosystem and to assess the environmental benefit of forest. Our analysis on the observation data of soil temperature within a subtropical evergreen broadleaved forest and in an open area nearby in the Ailao Mountains showed that the diurnal variations of soil temperature within and outside the forest presented a singlepeak curve. Compared with that in nearby open area, the diurnal variation of soil temperature in the forest was presented in shallower depths (less than 20 cm). The depth of the diurnal variation of soil temperature in the forest was deeper in spring and autumn (20 cm) than in summer and winter (15 cm). The soil temperature in the forest was lower than that in the open area at each depth, and the diurnal and annual variations of soil temperature in the forest were smaller than those in the open area. Overall, both the diurnal and the annual variation ranges of soil temperature were larger outside the forest than within the forest.  

Key words: organic matter, budget of nitrogen, phosphorus, potassium, biomass, straw.