Soil respiration characteristics and its relationship with environmental factors of four typical forests in Jinyun Mountain, Chongqing
Zhu Nan,Wang Bin,Wang Yunqi, Sun Suqi,Wu Chao,Liu Liziyuan
Key Lab. of Soil & Water Conservation and Combating Desertification of Ministry of Education,College of Soil and Water Conservation, Beijing Forestry University, 100083, Beijing, China
Abstract Soil respiration rates of four typical forest types including evergreen broadleaf forest, bamboo forest, mixed forest and coniferous forest were observed by LI-8100 soil carbon flux measurement system in Jinyun Mountain Nature Reserve of Chongqing during the growing season in 2012 (April to August). Meanwhile, soil temperature and soil moisture, soil pH at 5 and 10 cm depth were measured. Temporal variation of soil respiration rate of the four typical forests and the related environmental factors were analyzed. Results showed that: 1) Diurnal soil respiration rate of four typical forest types were different, the ranges of diurnal soil respiration rate for the mixed forest and coniferous forest in May and July were higher than that of evergreen broadleaf forest and bamboo forest. 2) The monthly soil respiration rate changed regularly, increasing from April to July and decreasing from July to August. 3)At 5 cm and 10 cm soil depth, soil respiration rate had an exponential relationship with soil temperature, and temperature sensibility of evergreen broadleaf forest (5 cm Q10 = 2.054, 10 cm Q10 = 2.117) was higher than others. 4) There was no significant correlation between soil respiration rate and soil moisture in the evergreen broadleaf forest, and the other three types of forests showed a quadratic relationship. 5) For the evergreen broadleaf forest, soil respiration rate and pH showed a significant correlation at 5 cm and 10 cm depth, and bamboo forest only presented a significant correlation at 5 cm depth. There was no significant correlation in the other two types of forests.
ZHU Nan,WANG Bin,WANG Yun-Qi, et al. Soil respiration characteristics and its relationship with environmental factors of four typical forests in Jinyun Mountain, Chongqing[J]. SSWCC, 2014, 12(2): 16-23.
