| Variation trends in decomposition rate of corn straw and in temperature and relative humidity of straw returned layer when returning straw to blank strips above plastic film |
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| DOI：10.7606/j.issn.1000-7601.2016.02.06 |
| Key Words: straw return to blank strips above cover plastic film corn straw decomposition rate soil temperature soil humidity path analysis hexi oasis irrigation |
| Author Name | Affiliation | | LU Bing-lin | College of Resources and Environmental Sciences, Gansu Agricultural University, Lanzhou, Gansu 730070, China
Institute of Soil, Fertilizer and Water Saving Agricultural, Gansu Academy of Agricultural Sciences, Lanzhou, Gansu 730070, China
Gansu Scientific Observing and Experiment Station of Ageo-Environment and Arable Land Conservation, Ministry of Agriculture, P.R. China, Lanzhou, Gansu 730070, China | | BAO Xing-guo | Institute of Soil, Fertilizer and Water Saving Agricultural, Gansu Academy of Agricultural Sciences, Lanzhou, Gansu 730070, China
Gansu Scientific Observing and Experiment Station of Ageo-Environment and Arable Land Conservation, Ministry of Agriculture, P.R. China, Lanzhou, Gansu 730070, China | | CHE Zong-xian | Institute of Soil, Fertilizer and Water Saving Agricultural, Gansu Academy of Agricultural Sciences, Lanzhou, Gansu 730070, China
Gansu Scientific Observing and Experiment Station of Ageo-Environment and Arable Land Conservation, Ministry of Agriculture, P.R. China, Lanzhou, Gansu 730070, China | | ZHANG Jiu-dong | Institute of Soil, Fertilizer and Water Saving Agricultural, Gansu Academy of Agricultural Sciences, Lanzhou, Gansu 730070, China
Gansu Scientific Observing and Experiment Station of Ageo-Environment and Arable Land Conservation, Ministry of Agriculture, P.R. China, Lanzhou, Gansu 730070, China | | YANG Xin-qiang | Institute of Soil, Fertilizer and Water Saving Agricultural, Gansu Academy of Agricultural Sciences, Lanzhou, Gansu 730070, China
Gansu Scientific Observing and Experiment Station of Ageo-Environment and Arable Land Conservation, Ministry of Agriculture, P.R. China, Lanzhou, Gansu 730070, China | | WANG Ping | College of Resources and Environmental Sciences, Gansu Agricultural University, Lanzhou, Gansu 730070, China |
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| Abstract: |
| To provide a theoretical basis and technical support for returning corn straw to field in local areas, variation trends in decomposition rate of corn straw, and temperature and relative humidity of straw returned layer when returning straw to blank strips above plastic film were studied by using nylon net bags in Hexi oasis irrigation. The results showed that straw returning could increase topsoil temperature at around 8 am but alleviate the soil temperature decline at around 8 pm. Daily average relative humidity, maximum relative humidity and minimum relative humidity at the straw returned layer under straw-buried to blank strips above the plastic film were higher than those with the straw-mulching treatment, but the diurnal relative humidity was lower. Meanwhile, daily minimum temperature at the straw returned layer by the straw-buried treatment was higher than that by straw-mulching, but the average daily temperature, maximum temperature and diurnal temperature were lower than those by straw-mulching to blank strips above cover plastic film. The temperature, relative humidity and decomposition time of straw returning layer were the main influencing factors for corn straw decomposition. Temperature at the straw returned layer had the greatest effect on the decomposition of corn straw, followed by relative humidity and decomposition time. The temperature and relative humidity at the straw returned layer played major roles in the decomposition of straw and the decomposition time played a secondary role under straw-mulcheing to blank strips above plastic film. The temperature, relative humidity and decomposition time played major roles in the decomposition rate of corn straw under straw-buried to blank strips above cover plastic film model. Straw-buried treatment entered the peak stage of straw decomposition after 30 days, while the monthly decomposition rate of corn straw reached to 15％～16%. Straw-mulched treatment entered the peak stage of straw decomposition after 60 days, while the monthly decomposition rate of corn straw reached to 11％～16%. After 180 days decomposition, cumulative decomposition rate of straw-buried reached 72.5%, and cumulative decomposition rate of straw-mulched reached to 56.0%. Therefore, straw-buried to blank strips above cover plastic film and separating it from seed rows model is better than straw-mulching in the Hexi oasis irrigation area. |
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