Photosynthetica 2016, 54(4):598-610 | DOI: 10.1007/s11099-016-0647-2

Ecophysiological responses of Cunninghamia lanceolata to nongrowing-season warming, nitrogen deposition, and their combination

L. Yu1,3, T. F. Dong2, Y. B. Lu1,3, M. Y. Song1,3, B. L. Duan1,*
1 Key Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, China
2 Key Laboratory of Southwest China Wildlife Resources Conservation of Ministry of Education and College of Life Sciences of China West Normal University, Nanchong, Sichuan, China
3 University of Chinese Academy of Sciences, Beijing, China

Warming winter and atmospheric nitrogen (N) deposition are expected to have effects on net primary production (NPP) of Chinese fir (Cunninghamia lanceolata) plantation and implications for plantation carbon sequestration. The effects of nongrowing-season warming on plant morphological and physiological traits were investigated in a greenhouse experiment with two-year-old C. lanceolata seedlings. Elevated temperature (ET) during the nongrowing season significantly increased the net photosynthetic characteristics. The strongest effects occurred during warming period from 1 December 2014 to 1 February 2015 (W1). Moreover, the carbohydrate concentration was elevated due to the warming during W1, but it declined during four months of the warming (from 1 December 2014 to 1 April 2015, W2). The seedlings kept under N deposition (CN) showed a positive effect in all the above-mentioned parameters except δ13C. Significant interactions between ET and N deposition were observed in most parameters tested. At the end of the experiment (W2), the seedlings exposed to a combined ET and N deposition treatment exhibited the highest carbon contents. Our results showed that N deposition might ameliorate the negative effects of the winter warming on the carbon content.

Keywords: chlorophyll fluorescence; fructose; gas exchange; malondialdehyde; reactive oxygen species; starch

Received: November 15, 2015; Accepted: June 17, 2016; Published: December 1, 2016Show citation

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Yu, L., Dong, T.F., Lu, Y.B., Song, M.Y., & Duan, B.L. (2016). Ecophysiological responses of Cunninghamia lanceolata to nongrowing-season warming, nitrogen deposition, and their combination. Photosynthetica, 54(4), 598-610. doi: 10.1007/s11099-016-0647-2.
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