| Effects of nighttime warming and copper pollution on inorganic nitrogen pool in wheatland soil |
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| DOI：10.7606/j.issn.1000-7601.2023.02.29 |
| Key Words: nighttime warming soil copper pollution wheatland soil inorganic nitrogen pool Q10 value |
| Author Name | Affiliation | | CHEN Gang | College of Agriculture, Henan University of Science and Technology, Luoyang, Henan 471023, China | | CHENG Xianghan | College of Agriculture, Henan University of Science and Technology, Luoyang, Henan 471023, China | | KOU Taiji | College of Agriculture, Henan University of Science and Technology, Luoyang, Henan 471023, China | | XIA Dongfang | College of Agriculture, Henan University of Science and Technology, Luoyang, Henan 471023, China | | YUN Wangshu | College of Agriculture, Henan University of Science and Technology, Luoyang, Henan 471023, China | | SONG Zhenwei | Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, China |
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| Abstract: |
| Nighttime warming (2 levels, warming and no\|warming) and copper pollution \[four gradients, CK (6 mg·kg-1), LP (43 mg·kg-1), MP (155 mg·kg-1) and SP (209 mg·kg-1)\] dual\|factor positioning experiment in wheat field, combining with constant temperature culture (91 d, 20℃ and 30℃) indoors were carried out to analyze the changes and stability characteristics of soil nitrate nitrogen, ammonium nitrogen and inorganic nitrogen content. These results found that, a significant difference on nitrate nitrogen and ammonium nitrogen in soil were observed by two\|factor interaction of warming and copper pollution. With increase of amount of copper applied in soil, soil nitrate nitrogen, ammonium nitrogen and inorganic nitrogen had the characteristics of first increase and then decrease. Nighttime warming led to a significant decrease in soil nitrate nitrogen and inorganic nitrogen by 10.8% and 5.7%, respectively. Nitrate nitrogen significantly decreased by 17.4% and 15.2% under LP and MP treatments, respectively, while SP resulted in a higher content of soil nitrate nitrogen and ammonium nitrogen by 6.9% and 15.1%, respectively. Constant temperature cultivation at 20℃ and 30℃ increased the content of inorganic nitrogen by 1.6~4.6 times and the content of ammonium nitrogen by 5.2~13.3 times but reduced the content of nitrate nitrogen by 40.3%~65.1%. Compared to the constant temperature culture at 30℃, the constant temperature culture at 20℃ promoted a larger content of inorganic nitrogen and ammonium nitrogen and a higher ratio of ammonium to nitrate in the soil. The nighttime warming, enhanced the Q10 value of soil nitrogen net mineralization and ammonification but decreased the Q10 value of nitrification by 16.8%, respectively. Suitable copper content (LP: 43 mg·kg-1) in soil accelerated the rate of ammonification, mineralization and nitrification of soil nitrogen. Our findings revealed that nighttime warming boosted the temperature sensitivity of soil nitrogen mineralization in dryland wheat field and reduced the stability of inorganic nitrogen pools. The relationship between soil copper pollution and soil nitrogen pool transformation and response to nighttime warming had a concentration effect. |
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