| Effect of surface mulching on soil nitrogen mineralization in dry farmland |
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| DOI：10.7606/j.issn.1000-7601.2018.03.01 |
| Key Words: soil\|surface mulching nitrogen mineralization dry farmland maize |
| Author Name | Affiliation | | SHI Bing-jie | College of Resources and Environmental Science, Northwest A & F University, Yangling, Shannxi 712100, China | | LI Shi-qing | College of Resources and Environmental Science, Northwest A & F University, Yangling, Shannxi 712100, China
State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Northwest A & F University, Yangling, Shaanxi 712100, China |
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| Abstract: |
| The effect of straw mulching and plastic mulch on soil net N mineralization in dryland croplands of Loess Plateau was studied by resin core technique method. The results showed the net immobilization of the soil mineral N with three treatments of bare ploughing , straw mulching and plastic mulching was 27.4, 20.9, 43.1 mg·kg-1 in the first two periods of maize (PT~V6 stages ). And the net mineralization was 26.3, 31.8 mg·kg-1 and 13.7 mg·kg-1 at the rest of maize stages. The three treatments of 0~20 cm soil layer showed a net soil retention combined the two stages and the net immobilization were 27.4, 20.9, 43.0 mg·kg-1 at all culture stages. In addition, straw mulching significantly increased the soil net N mineralization and net N mineralization rate and plastic film mulching increased soil surface temperature and water content, but it did not influence the net N mineralization and net N mineralization rate, implying that plastic mulching should not affect soil organic matter mineralization. The study also revealed that when the soil temperature was between 22℃ and 25℃ and the soil moisture content was about 20%, the soil nitrogen mineralization rate reached a maximum, indicating the promoting effect of dry\|wet alternation on mineralization. |
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