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| Effects of straw and its application on different organic materials on the leaching effect of saline-alkali soils in an irrigation area in the South bank of the Yellow River |
| Received:April 07, 2023 |
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| KeyWord:corn stover;organic materials;saline-alkali soil;combine;soil column leaching |
| Author Name | Affiliation | E-mail | | YIN Guangsheng | Faculty of Land Science and Technology, China Agricultural University, Beijing 100193, China
Key Laboratory of Arable Land Conservation in North China, Ministry of Agriculture and Rural Affairs, Beijing 100193, China | | | LI Wei | Faculty of Land Science and Technology, China Agricultural University, Beijing 100193, China
Key Laboratory of Arable Land Conservation in North China, Ministry of Agriculture and Rural Affairs, Beijing 100193, China | | | PENG Yumei | Faculty of Land Science and Technology, China Agricultural University, Beijing 100193, China
Key Laboratory of Arable Land Conservation in North China, Ministry of Agriculture and Rural Affairs, Beijing 100193, China | | | CHEN Chong | Faculty of Land Science and Technology, China Agricultural University, Beijing 100193, China
Key Laboratory of Arable Land Conservation in North China, Ministry of Agriculture and Rural Affairs, Beijing 100193, China | | | SHANG Jianying | Faculty of Land Science and Technology, China Agricultural University, Beijing 100193, China
Key Laboratory of Arable Land Conservation in North China, Ministry of Agriculture and Rural Affairs, Beijing 100193, China | | | WANG Xiang | Faculty of Land Science and Technology, China Agricultural University, Beijing 100193, China
Key Laboratory of Arable Land Conservation in North China, Ministry of Agriculture and Rural Affairs, Beijing 100193, China | wangxiang@cau.edu.cn |
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| Abstract: |
| To analyze and compare the dynamic changes of salt and dissolved organic matter during the leaching of saline-alkali soils under the addition of different organic materials, control（CK）, 3% corn stover（W1）, 2% corn stover with 1% cow dung（W2）, and 2% corn stover with 1% biochar（W3）were applied to moderate and severe saline-alkali soils in an irrigation area in the south bank of the Yellow River. Subsequently, the soluble salt and dissolved organic carbon（DOC）content of the eluent, soil electrical conductivity（EC）and salt-based ions before and after leaching were analyzed, to explore the changes in soil salt and organic decomposition processes under the addition of different organic matter during the leaching process. The results showed that： the EC value and water-soluble salt ion content of the soil after the leaching of the two saline-alkali soils were significantly reduced by straw and its application on different organic materials. Compared with before leaching, under the treatment of W1, W2, and W3, the desalination rates of moderate saline-alkali soil were 65.02%, 67.22%, and 66.21%, and the heavily saline-alkali soil were 73.85%, 66.14% and 69.55%, respectively. Under the treatment of W1, W2, and W3, the reductions of water-soluble Na+, Ca2+, and Mg2+ in moderately saline-alkali soil ranged from 48.38%- 69.32%, 70.89%-75.86%, and 73.00%- 74.45%, respectively, and the reduction ranges of water-soluble K+, Na+, Ca2+, and Mg2+ in heavily saline-alkali soil were 14.86%- 23.39%, 70.98%-85.84%, 86.63%-92.39%, and 93.72%-95.42%, respectively. The input of organic materials increased the content of DOC in the two saline-alkali soils, but the degree of humification in the two saline-alkali soils was different under different treatments. In moderate saline-alkali soil, there were no significant differences between special UV absorbance of 254 nm（SUVA254）and spectra slope（SR）in eluents of different organic material treatment, and SUVA254 decreased with the increase in leaching frequency, while SR increased. In severe saline-alkali soil, SR of the dissolved organic matter under the treatment of added organic materials was low, but SUVA254 of the treatment with 3% straw was lower than that of the treatments with cow dung or biochar. The application of different organic materials to straw increased the soil ′ s water holding capacity. W1 was the best in moderate saline-alkali soil, with an increase of 31.00%; W1 and W2 in severe saline-alkali soil increased by 76.46% and 74.33%. In summary, the addition of exogenous organic materials in the same leaching condition reduced the soluble salt-based ion content of the two saline-alkali soils to varying degrees, and effectively reduced the salinity of the soil, especially the severe saline-alkali soil. Simultaneously, the addition of exogenous organic materials also increased the input source of soil DOC, improved the soil ′ s water holding capacity, and made up for the nutrient loss caused by leaching on saline-alkali soils. Under the given leaching conditions, W2 in desalination and Na+ reduction was the best in moderate saline-alkali soil, while W1 was better in severe saline-alkali soil. |
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