Soil respiration of a Moso bamboo forest significantly affected by gross ecosystem productivity and leaf area index in an extreme drought event

PeerJ

article

Yuli Liu¹  Guomo Zhou¹  Huaqiang Du¹  Frank Berninger²  Fangjie Mao¹  Xuejian Li¹  Liang Chen¹  Lu Cui¹  Yangguang Li¹  Di’en Zhu¹ 

[1] State Key Laboratory of Subtropical Silviculture, Zhejiang Agricultural and Forestry University, Lin’an, Hangzhou city, Zhejiang province;Key Laboratory of Carbon Cycling in Forest Ecosystems and Carbon Sequestration of Zhejiang Province, Zhejiang Agricultural and Forestry University, Lin’an, Hangzhou city, Zhejiang province;School of Environmental and Resources Science, Zhejiang Agricultural and Forestry University, Lin’an, Hangzhou city, Zhejiang province;Department of Forest Ecology, University of Helsinki

关键词: Moso bamboo forest;    Environmental determiners;    Soil respiration;    Leaf area index;    Gross ecosystem productivity;   

DOI  :  10.7717/peerj.5747

学科分类：社会科学、人文和艺术（综合）

来源: Inra

【 摘 要 】

Moso bamboo has large potential to alleviate global warming through carbon sequestration. Since soil respiration (Rs) is a major source of CO2 emissions, we analyzed the dynamics of soil respiration (Rs) and its relation to environmental factors in a Moso bamboo (Phllostachys heterocycla cv. pubescens) forest to identify the relative importance of biotic and abiotic drivers of respiration. Annual average Rs was 44.07 t CO2 ha−1 a−1. Rs correlated significantly with soil temperature (P < 0.01), which explained 69.7% of the variation in Rs at a diurnal scale. Soil moisture was correlated significantly with Rs on a daily scale except not during winter, indicating it affected Rs. A model including both soil temperature and soil moisture explained 93.6% of seasonal variations in Rs. The relationship between Rs and soil temperature during a day showed a clear hysteresis. Rs was significantly and positively (P < 0.01) related to gross ecosystem productivity and leaf area index, demonstrating the significance of biotic factors as crucial drivers of Rs.

【 授权许可】

CC BY