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[1]WANG Yajun,YU Shanshan.Soil Respiration and Impact Factors of Tropical Seasonal Rainforests in Xishuangbanna, Yunnan Province[J].Research of Soil and Water Conservation,2016,23(01):133-138,144.

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Soil Respiration and Impact Factors of Tropical Seasonal Rainforests in Xishuangbanna, Yunnan Province

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 23 Number of periods: 2016 01 Page number: 133-138,144 Column: Public date: 2016-02-28

Title:: Soil Respiration and Impact Factors of Tropical Seasonal Rainforests in Xishuangbanna, Yunnan Province

Author(s):: WANG Yajun¹, YU Shanshan²; 1. College of Architecture, Fuzhou University, Fuzhou 350108, China;
2. College of Architecture and Civil Engineering, Xiamen University, Xiamen, Fujian 361005, China

Keywords:: Xishuangbanna; tropical seasonal rainforests; soil respiration rate; impact factors

CLC:: S714.2

DOI:: -

Abstract:: In order to explore soil respiration and impact factors of tropical seasonal rainforests in Xishuangbanna, measurements of soil respiration, soil temperature and moisture content, soil nutrients (0—10 cm) during different seasons in 2014 by Li-6400, and characteristics of the daily and seasonal variations of soil respiration and their controlling factors were presented, and exponential model and linear model were used to analyze the relations between soil respiration and soil temperature and humidity. The results showed that daily air temperature of tropical seasonal rainforests showed the single peak curve, and daily atmospheric moisture had a V-shape variation trend, soil temperature in 0—10 cm depth had the same variation trend as the atmospheric temperature, which the peak occurred at 14:00, and soil moisture had the V-shape variation trend with local fluctuation. The daily soil respiration rate showed a single peak curve which the daily maximum of soil respiration rate occurred at 14:00 and the minimum occurred at 6:00, and at same time, evergreen monsoon forest soil respiration rate was higher than that in the deciduous monsoon forest. These two tropical seasonal rainforest soil respiration rates had the significant seasonal differences (p < 0.05), which showed the order: autumn > summer > spring > winter. We found that soil respiration was extremely significant correlated with soil temperature in 0—10 cm depth, which could be describled by exponential equation (p < 0.01), the exponential regression model could explain 53.7%～71.0% of the soil respiration, and soil respiration was extremely significant correlated with soil moisture content in 0—10 cm depth, which followed the linear equation (p < 0.01), the exponential regression model could explain 52.1%～52.2% of the soil respiration. Through the partial correlation analysis to exclude other environment factors, we found that soil respiration had the extremely significantly correlation with soil organic matter and soil available nutrients (p < 0.01), had significantly correlation with soil nitrogen content (p < 0.05) and no significantly correlation with soil phosphorus (p > 0.05), of which the correlation coefficients in the evergreen monsoon forest were higher than those in the deciduous monsoon forest.

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