The Impact of Green Manure Planting on Carbon and Nitrogen Content of Freshwater Salinized Soil and Leaching Solution in Saline-alkali Winter Fallow Farmland

doi:10.7668/hbnxb.20194507

Abstract

Abstract:

To investigate the influence of green manure cultivation on the carbon and nitrogen content of saline-alkali soil under freshwater leaching,a field experiment was conducted from October 2021 to May 2022.Three treatments were set up:winter fallow(T1),Dongmu 70 rye(T2),and rape(T3).The spatial distribution of soil organic carbon(SOC),nitrate nitrogen($\mathrm{NO}_{3}{ }^{-}-\mathrm{N}$),and ammonium nitrogen($\mathrm{NH}_{4}^{+}-\mathrm{N}$)in the soil and leachate were measured.The results revealed that in the 0—30 cm soil layer,the soil organic carbon content of T1,T2,and T3 increased from 6.20,6.58,7.24 g/kg before leaching to 6.48,7.39,8.06 g/kg after leaching,representing an increase of 4.41%,12.20%,and 11.23%,respectively.After freshwater leaching,the nitrate nitrogen content in the 0—60 cm soil layer of T1 was significantly higher than that of T2 and T3.In the 0—30 cm soil layer,the respective reductions for each treatment were 42.42%,3.85%,and 10.84%.In the 60—90 cm soil layer,the reductions were 1.38%,7.96% and 18.11%.There were no significant differences in ammonium nitrogen content among the different treatments before leaching,but after leaching,the highest ammonium nitrogen content was observed in T2.In conclusion,after leaching irrigation,the soil organic carbon content in different soil layers increased compared to before leaching,while soil nitrogen showed a significant decrease.Analysis of nitrogen content in the soil and leachate indicated that the main nitrogen loss caused by leaching irrigation was in the form of nitrate nitrogen.Compared to winter fallow farmland,the cultivation of rapeseed green manure had a significant effect on increasing soil nitrogen content,while Dongmu 70 green manure was the the most effective in reducing soil nitrogen loss.

Key words: Saline-alkali land, Winter fallow farmland, Green manure, Freshwater pillar salt, Organic carbon, Nitrate nitrogen, Ammonium nitrogen

WANG Yuhao, WANG Jingkuan, DU Haiyan, JI Xiaohui, LIU Xinwei. The Impact of Green Manure Planting on Carbon and Nitrogen Content of Freshwater Salinized Soil and Leaching Solution in Saline-alkali Winter Fallow Farmland[J]. Acta Agriculturae Boreali-Sinica, 2024, 39(1): 143-149. doi: 10.7668/hbnxb.20194507.

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Figures/Tables 8

Fig.1 Underground water level dynamics during the test period

Tab.1 Basic physical and chemical nature of test soil

土层/cm Soil depth	土壤pH Soil pH	全盐量/ (g/kg) Total salt quantity	有机质含量/ (g/kg) Organic matter content	全氮含量/ (g/kg) Total nitrogen content	速效磷含量/ (mg/kg) Available phosphorus content	速效钾含量/ (mg/kg) Available potassium content
0~30	8.38±0.02	1.46±0.03	11.78±0.45	0.82±0.13	7.26±0.75	284.27±8.60
30~60	8.59±0.03	1.77±0.05	4.63±0.15	0.56±0.06	4.59±0.16	201.85±6.01
60~90	8.78±0.03	2.22±0.02	2.70±0.08	0.39±0.01	2.43±0.16	185.39±6.34

Fig.2 Changes in organic carbon content of freshwater salinized soil after different treatments A.Before salt leaching with freshwater;B.After salt leaching with freshwater.Different lowercase letters indicate significant differences among treatments in the same depth(P<0.05);different capital letters indicate significant differences among different depths of the same treatment(P<0.05).The same as Fig.3—4.

Fig.3 Changes in nitrate nitrogen content of freshwater salinized soil after different treatments

Fig.4 Changes in ammonium nitrogen content of freshwater salinized soil after different treatments

Fig.5 Changes in organic carbon concentration of soil leaching solution after different treatments

Fig.6 Changes in nitrate nitrogen concentration of soil leaching solution after different treatments

Fig.7 Changes in ammonium nitrogen concentration of soil leaching solution after different treatments

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