[Effects of Various Combinations of Fertilizer, Soil Moisture, and Temperature on Nitrogen Mineralization and Soluble Organic Nitrogen in Agricultural Soil]

Fei-Fei Tian; Hong-Fei Ji; Le-Yun Wang; Xi-Lai Zheng; Jia Xin; Hui Nai

doi:10.13227/j.hjkx.201801040

[Effects of Various Combinations of Fertilizer, Soil Moisture, and Temperature on Nitrogen Mineralization and Soluble Organic Nitrogen in Agricultural Soil]

Huan Jing Ke Xue. 2018 Oct 8;39(10):4717-4726. doi: 10.13227/j.hjkx.201801040.

[Article in Chinese]

Authors

Fei-Fei Tian¹, Hong-Fei Ji¹, Le-Yun Wang¹, Xi-Lai Zheng^{1

2}, Jia Xin^{1

2}, Hui Nai¹

Affiliations

¹ College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China.
² Key Laboratory of Marine Environmental Science and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China.

PMID: 30229620
DOI: 10.13227/j.hjkx.201801040

Abstract

An 84-day laboratory incubation experiment was conducted to investigate the effects of different fertilizers (urea; manure), moisture conditions (60%, 75% and 90% water holding capacity) and temperatures (15, 25 and 35℃) on nitrogen mineralization. The experiment included 3 treatments:①CK, unfertilized control; ② Ur, adding urea at N 120 mg·kg^-1; 3 UM, adding urea and manure (equal to adding N 120 mg·kg^-1). Total inorganic nitrogen and soluble organic nitrogen (SON) were determined at different times throughout the experiment. The results showed that soil temperature and fertilization type had significant impacts on the net mineralization rates, cumulative mineralization, and the potentially mineralizable nitrogen (N₀) (P<0.01). In addition, the soil net N mineralization rates and cumulative mineralization significantly (P<0.05) increased by 1.46-8.17 and 2.00-8.15 times, respectively, when fertilizers were added into soils. The soil net N mineralization rates and cumulative mineralization increased with the increase of temperature. Compared with CK treatment, Ur and UM treatments could significantly increase the content of soil soluble organic nitrogen(SON). There was a significant negative correlation between the content of SON and cumulative mineralization. It indicated that SON was involved in soil nitrogen mineralization as a non-negligible component. Increasing the temperature could significantly increase the mineralization rate and mineralization intensity of SON in soil, but the water content had no significant influence on the SON of the soils. Moreover, the authors found that fertilization treatment worked significantly in decreasing the Q₁₀ value for soil N mineralization compared with CK treatment. Further, the Q₁₀ value was significantly lowest in UM treatment(Q₁₀=1.01). The results showed that the application of organic manure significantly reduced the sensitivity of the rate of nitrogen mineralization to temperature changes, which was beneficial in slowing down the release rate of mineral nitrogen under high temperatures and improving the nitrogen utilization efficiency of crops.

Keywords: organic fertilizer; soil moisture; soil nitrogen mineralization; soluble organic nitrogen; temperature sensitivity (Q10).

Publication types

English Abstract