| 袁胜南,商雨晴,王俊.不同温度下添加绿肥对旱作农田土壤有机碳矿化的影响[J].干旱地区农业研究,2020,38(5):45~50 |
| 不同温度下添加绿肥对旱作农田土壤有机碳矿化的影响 |
| Effects of green manure on soil organic carbon mineralization in dry land soil under different temperature |
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| DOI：10.7606/j.issn.1000-7601.2020.05.07 |
| 中文关键词: 绿肥 土壤有机碳矿化 温度变化 旱作农田 |
| 英文关键词:green manure soil organic carbon mineralization temperature variation dry land soil |
| 基金项目:国家自然科学基金（31570440） |
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| 中文摘要: |
| 为揭示气候变暖背景下绿肥添加对旱作农田土壤有机碳矿化的影响，采用室内恒温培养法，研究了添加长武怀豆（S）、黑麦草（R）、长武怀豆与黑麦草混合（M）在5℃、15℃、25℃下的土壤有机碳矿化过程。结果表明：培养温度和绿肥种类及其二者交互作用对土壤有机碳矿化速率均具有显著影响。在15℃和25℃下有机碳矿化速率峰值均出现在培养开始后第2天，然后快速下降并分别在第17天和第22天后趋于稳定；而在5℃下有机碳矿化速率峰值则推迟至第8天出现，然后缓慢下降至第42天后趋于稳定。在为期79 d的培养期间，土壤有机碳平均矿化速率和累积矿化量均随着温度升高而增加。与不添加绿肥的对照（CK）相比， S、M和R处理土壤有机碳累积矿化量提高了10.5~11.6倍（P<0.05），绿肥处理间变化趋势为S>M>R，与其本身含碳量相一致。与CK相比，S、M和R处理土壤温度敏感性（Q10）分别降低了11.0%、11.2%和11.8%。绿肥添加和增温同时还提高了土壤有机碳矿化动力学参数，其中S处理在不同温度下均较其他处理具有更高的土壤有机碳矿化速率常数。与CK相比，土壤碳素和氮素水平在培养结束后分别增加了36.0%~46.2%和39.3%~47.4%。表明添加绿肥尤其是豆科绿肥能够显著促进农田土壤有机碳矿化，改善土壤养分。 |
| 英文摘要: |
| In order to reveal the influence of green manure on soil organic carbon (SOC) mineralization in the context of global warming, soils with three green manures of Changwu Soyean (S), Ryegrass (R), the combination of them (M), and a control without green manure (CK) were incubated at 5℃, 15℃, and 25℃ for 79 d. The SOC mineralization as indicated by CO2 emission was measured dynamically and modeled by using a first\|order kinetic model. Soil CO2 emissions was significant for green manure species, incubation temperature, and their interaction. The SOC mineralization rate peaked at 2 d after the incubation and then decreased rapidly and stabilized after 17 d and 22 d when incubated at 15℃ and 25℃, respectively. However, the mineralization rate peaked at 8 d after incubation and decreased and stabilized after 42 d when incubated at 5 ℃. The mean mineralization rate and cumulative SOC mineralization increased with increasing temperature. Compared to CK, treatments S, M, and R increased the cumulative mineralization by 10.5~11.6 times with a trend of S>M>R (P<0.05), which was in consistent to the soil C and N contents in them. The temperature sensitivities (Q10) of SOC mineralization decreased by 11.0%, 11.2%, and 11.8% with S, M, and R than CK, respectively. Both green manure addition and increasing of incubation temperature improved the parameters of SOC mineralization kinetics model, especially for t that with S. Compared to CK, treatments S, M, and R increased soil carbon and nitrogen contents by 36.0%~46.2% and 39.3%~47.4%, respectively. Overall, green manure addition, especially, legumes, could stimulate SOC mineralization and improve soil nutrient cycling in dryland cropping systems. |
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