PJB-2018-318
Nutrient leaching of Chinese fir (Cunninghamia lanceolata) seedlings under simulated nitrogen deposition
Wenfei Liu, Yanyan Li, Guomin Huang, Jianping Wu, Honglang Duan, Yingchun Liao, Rongzhen Huang, Zhipeng Xu and Houbao Fan
Abstract
To investigate the impacts of nitrogen addition on soil nutrient leaching, a one-year greenhouse experiment was conducted on Chinese fir (Cunninghamia lanceolata) seedlings with five nitrogen addition treatments: N0 (Control), N1 (60 kg N ha-1 yr-1), N2 (120 kg N ha-1 yr-1), N3 (240 kg ha-1 yr-1) and N4 (480 kg ha-1 yr-1). Results showed that pH values of soil leaching solution were significantly decreased by the treatments of N2, N3 and N4, with respective decline of 15.6%, 19.1%, and 25.9%, compared with the N0 treatment. Nitrogen feritilization increased ammoniacal nitrogen and nitrate nitrogen in the soil leaching solution. Nitrogen loss due to soil leaching was also enhanced by nitrogen addition, amounting to 7.37, 20.71, 48.72 and 99.48 mg kg-1 for N1, N2, N3, and N4, respectively. Similarly, more K+, Ca2+ and Mg2+ were leached into the leaching solution with nitrogen addition. The annual loss of the five nutrient ions into the leaching solution ranked as follows: Ca2+﹥NO3-﹥NH4+﹥K+﹥Mg2+. The leaching losses of these five nutrient ions increased with across nitrogen gradients. Our study suggests that high-level nitrogen deposition may cause soil nutrient loss through leaching in subtropical forests.
To Cite this article:
Liu, W., Y. Li, G. Huang, J. Wu, H. Duan, Y. Liao, R. Huang, Z. Xu and H. Fan. 2019. Nutrient leaching of Chinese fir (Cunninghamia lanceolata) seedlings under simulated nitrogen deposition. Pak. J. Bot., 51(5): DOI: http://dx.doi.org/10.30848/PJB2019-5(35)
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