生物炭对植烟土壤氮素形态迁移及微生物量氮的影响

doi:10.16843/j.sswc.2017.03.004

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Abstract [Background] This paper studies the effect of applied biochar on the nitrogen (N) transformation under different N levels in the tobacco-planting soil, because the C/N ratio in the soil for continuous planting tobacco in Henan province is not balanced, resulting in the tobacco quality reduced. [Methods] The field experiment was carried out with different N levels under the biochar application; it is located in Daguo town of Linying County, Henan province (E113°81', N33°79'). Five treatments were set as:1) no N no biochar (CK); the other four applied with 1 600 kg/hm² biochar, with four N levels:2) 0 kg/hm² (N0); 3) 37.5 kg/hm² (N1); 4) 52.5 kg/hm²(N2); 5) 67.5 kg/hm²(N3). Based on the five sample points, the total N (TN), available N (AN), nitrate N (NO₃^--N) and ammonium N (NH₄⁺-N) in three soil layers (i.e. 0-20 cm, 20-40 cm, and 40-60 cm) as well as the soil microorganism biomass N (SMBN) in 0-20 cm soil layer were measured and analyzed. [Results] The biochar application reduced the N content in the deep layer, which indicated that it elevated N sequestration in top soil layer. Compared with the CK, the decrement of TN, AN, NO₃^--N, and NH₄⁺-N content was 11.21%, 49.07%, 42.29% and 31.35%, respectively under the no treatment. The AN, NO₃^--N, and NH₄⁺-N content mainly existed in 0-20 cm soil layer, and all of them increased with N application rate. The highest content of TN, AN, NH₄⁺-N occurred under N3 treatment, which was 2.10 g/kg, 261.86 g/kg, 264.90 mg/kg, and 49.80 mg/kg, respectively. While the NO₃^--N content reduced with the soil layer increased, and it concentrated in 0-20 cm layer with the highest level as 264.90 mg/kg in N3 treatment. Moreover, the NO₃^--N content in 20-40 cm soil layer was significantly different from that of other soil layer under different N level. The effect of N application rate on its transformation presented before 30 d after the tobacco transplanted. The biochar application increased the SMBN after tobacco transplanted 60 d, while the effect of the amount of N fertilizer on the microbial biomass nitrogen entropy was mainly reflected after tobacco transplanted 30 d. [Conclusions] The effect of N application rate on soil N content mainly in 0-20 cm soil layer, and it was significantly affected during the early stage of tobacco growth. The biochar restrained the N transformation in soil with lower N application rate, but with little effect under higher N application rate. It is suggested that the biochar combined with 67.5 kg/km² N application is the optimal practice to improve soil N content in central area of Henan province.

Key words： tobacco-planted soil nitrogen biochar nitrogen application rate transformation

Received: 20 December 2016

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S158

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	ZHANG Hong
	LI Ying
	ZHANG Yujun
	ZHU Jinfeng
	LIU Shiliang
	LIU Fang
	JIANG Guiying

Cite this article:

ZHANG Hong,LI Ying,ZHANG Yujun, et al. Effects of biochar on nitrogen transformation and the microbial biomass nitrogen under different nitrogen application rates[J]. SSWC, 2017, 15(3): 26-35.

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http://journal12.magtechjournal.com/Jweb_stbc/EN/10.16843/j.sswc.2017.03.004 OR http://journal12.magtechjournal.com/Jweb_stbc/EN/Y2017/V15/I3/26

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