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Effects of Soil Temperature, Water Content, Species, and Fertilization on Soil Respiration in Bamboo Forest in Subtropical China

1
Forestry College, Fujian Agriculture and Forestry University, Fuzhou 350002, Fujian Province, China
2
State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, 210008 Nanjing, Jiangsu Province, China
*
Author to whom correspondence should be addressed.
Forests 2020, 11(1), 99; https://doi.org/10.3390/f11010099
Received: 17 December 2019 / Revised: 6 January 2020 / Accepted: 11 January 2020 / Published: 13 January 2020
(This article belongs to the Section Forest Ecology and Management)
Abstract: Understanding the change pattern of soil respiration (SR) and its drivers under different bamboo species and land management practices is critical for predicting soil CO2 emission and evaluating the carbon budget of bamboo forest ecosystems. A 24-month field study was performed in subtropical China to monitor SR in experimental plots of local bamboo (Phyllostachys glauca) without fertilization (PG) and commercial bamboo (Phyllostachys praecox) with and without fertilization (PPF and PP, respectively). The SR rate and soil properties were measured on a monthly timescale. Results showed that the SR rate ranged from 0.38 to 8.53 µmol CO2 m−2s−1, peaking in June. The PPF treatment had higher SR rates than the PP and PG treatments for most months; however, there were no significant differences among the treatments. The soil temperature (ST) in the surface layer (0–10 cm) was found to be the predominant factor controlling the temporal change pattern of the monthly SR rate in the PG and PP treatments (i.e., those without fertilization). A bivariate model is used to show that a natural factor—comprised of ST and soil water content (SWC)—explained 44.2% of the variation in the monthly SR rate, whereas biological (i.e., bamboo type) and management (i.e., fertilization) factors had a much smaller impact (less than 0.1% of the variation). The annual mean SR showed a significant positive correlation with soil organic matter (SOM; r = 0.51, P<0.05), total nitrogen (TN; r = 0.47, P<0.05), total phosphorus (TP; r = 0.60, P<0.01), clay content (0.72, P<0.05) and below-ground biomass (r = 0.60*), which altogether explain 69.0% of the variation in the annual SR. Our results indicate that the fertilization effect was not significant in SR rate for most months among the treatments, but was significant in the annual rate. These results may help to improve policy decisions concerning carbon sequestration and the management of bamboo forests in China.
Keywords: red soil; Phyllostachys glauca; Phyllostachys praecox; partial canonical correspondence analysis red soil; Phyllostachys glauca; Phyllostachys praecox; partial canonical correspondence analysis
MDPI and ACS Style

Zhang, H.; Qian, Z.; Zhuang, S. Effects of Soil Temperature, Water Content, Species, and Fertilization on Soil Respiration in Bamboo Forest in Subtropical China. Forests 2020, 11, 99.

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