Effect of water stress on N₂O emission rate of 5 tree species

Abstract

The N₂O emission rates, photosynthesis, respiration and stomatal conductance of the dominant tree species from broadleaf/Korean pine forest in Changbai Mountain were measured by simulated water stress with the closed bag-gas chromatography. A total of five species seedlings were involved in this study, i.e.,Pinus koraiensis Sieb. et Zucc,Fraxinus mandshurica Rupr,Juglans mandshurica Maxim,Tilia amurensis Rupr, andQuercus mongolica Fisch. ex Turcz.. The results showed that the stomatal conductance, net photosynthetic rate and N₂O emission of leaves were significantly reduced under the water stress. The stoma in the leaves of trees is the main pathway of N₂O emission. N₂O emission in the trees mainly occurred during daytime. N₂O emission rates were different in various tree specie seedlings at the same water status. In the same tree species, N₂O emission rates decreased as the reduction of soil water contents. At different soil water contents (MW, LW) the N₂O emission rates ofPinus koraiensis decreased by 34.43% and 100.6% of those in normal water condition, respectively. In broadleaf arbor decreased by 31.93% and 86.35%, respectively. Under different water stresses N₂O emission rates in five tree species such asPinus koraiensis, Fraxinus mandshurica, Juglans mandshurica, Tilia amurensis, andQuercus mongolica were 38.22, 14.44, 33.02, 16.48 and 32.33 ngN₂O·g⁻¹DW·h⁻¹, respectively.

Keywords

Trees / N₂O emission rate / Soil water stress / broadleaf/Korean pine forest / Changbai Mountain / S718.55 / A

References

[1] Chang C., Janzen H.H., Cho C.M., Nakonechny E.M. Nitrous oxide emission through plants [J]. Soil Science Society of America Journal, 1998, 62: 35-38.

[2] Guanxong Chen, Chuhui Shang, Kewei Yu et al. Investigation on the emission of N₂O by plants Chinese Journal of Applied Ecology [J], 1990, 1: 94-96. (in Chinese)

[3] Chen X., Boeckx P., Shen S.M., Van Cleemput O.V. Emission of N₂O from rye grass (Lolium perenne L.) [J]. Biology and Fertility of Soils, 1999, 28: 393-396.

[4] Zhenwen Chi, Fengshan Zhang, Xiaoyan Li The primary study on water-heat conditions of forest ecosystem on northern slope of Changbai Mountain [J]. Research of Forest Ecosystem, 1981, 11: 167-178. (in Chinese)

[5] Rusch F., Renneberg H. Black alder (Alnus glutinosa (L.) Gaertn.) tress mediate methane and nitrous oxide emission from the soil to the atmosphere [J]. Plant and Soil, 1998, 201: 1-7.

[6] Sinha, S.K. & Nicholas, D.J.D. 1981. Nitrate reductase [M]. Paleg and Aspinall, p145–171.

[7] Yuesi Wang, Baoming Ji, Yao Huang Effect of grazing and cultivating on emission of nitrous oxide, carbon dioxide and uptake of methane from grasslands [J]. Environmental Science, 2001, 22(6): 7-13.

[8] Hui Xu, Xiujun Zhang, Chengxin Ma A preliminary study on N₂O and CH₄ emission from different soils on northern slope of Changbai Mountain [J]. Chinese Journal of Applied Ecology, 1995, 6: 373-377. (in Chinese)

[9] Changai Xu, Jishan Ni The regulations of upper transportation of NO₃ ⁻ and outflow of NO₃ ⁻ in a vacuole on nitrate reductase activity [J]. Acta Phytophysiologica Sinca, 1990, 16: 337-340. (in Chinese)

[10] Sihe Yang, Guanxong Chen, Jihui Lin et al. N₂O emission from woody plants and its relation to their physiological activities [J]. Chinese Journal of Applied Ecology, 1995, 6: 337-340. (in Chinese)

[11] Xiujun Zhang, Hui Xu, Guanxong Chen Effect of soil moisture and temperature on CH₄ and N₂O emission of forest soil [J]. Journal of Forestry Research, 2001, 11(3): 203-206.

[12] Xiujun Zhang, Hui Xu, Guanxong Chen N₂O emission rate from trees [J]. Acta Phytoecilogica Sinica, 2002, 62(5): 538-542.