|
| Effects of addition of different types of straw on soil CO2 emission and soil chemical properties |
| Received:September 02, 2021 |
| View Full Text View/Add Comment Download reader |
| KeyWord:straw return;CO2 emission rate;cumulative CO2 emission;soil nutrient |
| Author Name | Affiliation | E-mail | | LI Huan | College of Resources and Environment Science, Yunnan Agricultural University, Kunming 650201, China | | | ZHAO Ping | College of Resources and Environment Science, Yunnan Agricultural University, Kunming 650201, China
Yunnan Scientific Observation Station for Cultivated Land Conservation of the Ministry of Agriculture and Rural Affairs, Kunming 650201, China | | | CHEN Linkang | College of Resources and Environment Science, Yunnan Agricultural University, Kunming 650201, China | | | LI Lianhua | College of Resources and Environment Science, Yunnan Agricultural University, Kunming 650201, China | | | XIANG Rui | College of Resources and Environment Science, Yunnan Agricultural University, Kunming 650201, China | | | LONG Guangqiang | College of Resources and Environment Science, Yunnan Agricultural University, Kunming 650201, China
Yunnan Scientific Observation Station for Cultivated Land Conservation of the Ministry of Agriculture and Rural Affairs, Kunming 650201, China | ynaulong2316@163.com |
|
| Hits: 1591 |
| Download times: 1684 |
| Abstract: |
| Straw composition and soil properties are the important factors effecting straw decomposition, and they thus affect the soil CO2 emission and nutrient dynamics. In this study, three types of straw [maize（MS）, potato（PS）, and maize–potato mixed straw（CS）] were selected and added into three cropping pattern soils [maize monoculture（MM）, potato monoculture（MP）, and maize–potato intercropping （I）], respectively. A 105-day, indoor, constant temperature culture experiment was conducted to explore the CO2 emission and soil chemical properties changes of the straw types in the different sub-environments. The results showed that the soil cropping pattern significantly affected the cumulative CO2 emission after incorporating MS straw but that it had no significant effect on PS or CS straw. Compared with the weighted average（WM）of MS and PS single straw, CS increased the cumulative CO2 emission and the net cumulative CO2 emission in MM soil by 19.2% and 19.9%, respectively. Compared with the before-culture condition, MS increased the soil pH and dissolved organic carbon content by the end of the culture, but it had little effect on available P and available K and had a significantly lower effect than PS or CS. When the same straw was added to the soils with the different cropping patterns, the increases of available P, available K, and ammonium N were higher in MP soil（relative to before culture）than in I or MM soil. In conclusion, straw decomposition and carbon emission in soil are firstly affected by straw autacoids, and the influence of the soil cropping pattern is lower. These factors have an important influence on soil chemical properties during the decomposition process. |
|
|
|
