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| Effect of conservation practices on soil organic matter in medium or low fertility black soil |
| Received:January 30, 2020 |
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| KeyWord:no-tillage;straw return;manure;meta-analysis |
| Author Name | Affiliation | E-mail | | LI Bei | College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China | | | DING Guang-ge | Siping Municipal Commission of Development and Reform, Siping 136000, China | | | ZHAO Peng-fei | Lishu County Agricultural Technology Extension Station, Lishu 136500, China | | | ZHOU Dan | Lishu County Agricultural Technology Extension Station, Lishu 136500, China | | | ZHAO Chuang | Lishu County Agricultural Technology Extension Station, Lishu 136500, China | | | MI Guo-hua | College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China | | | ZHANG Wei-feng | College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China | wfzhang@cau.edu.cn |
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| Abstract: |
| In order to explore the effect of conservation practices on soil organic matter in the black soil area of northeast China, the soil organic matter(SOM)from 341 sites across 19 townships of Lishu County were tracked in 2008 and 2015, and the SOM change was analyzed which was affected by three conservation practices, including no-tillage, straw return and manure application. Compared to the initial in 2008, the average SOM content decreased by 10.5% with an average of 18.8 g·kg-1 in 2015. The higher the initial organic matter content was, the more obvious the decrease was. Significant decrease were found in the groups of initial SOM>20 g·kg-1. However, in groups of initial SOM ≤ 20 g·kg-1, the SOM increased by 4.5% compared with that in 2008(15.3 g·kg-1). The main reason is that the proportion of conservation practices adopted by farmers in the groups of SOM ≤ 20 g·kg-1 was as high as 63.2%, which was much higher than that in the groups of SOM>20 g·kg-(1 49.3%). Furthermore, the soil fertility could be improved by the combination of two practices in areas with low initial SOM, and SOM was significantly enhanced by three measures using together. But in areas with high initial SOM, these two practices contributed only to maintaining soil fertility. Now, SOM of black soil area of Lishu could keep up and even increase by using conservation practices, but we need to strengthen technological integration and continuous adoption. |
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