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为探讨农田土壤不同组分呼吸及其对温度变化的响应,选取山东平邑旱耕土和湖南桃江水稻土为供试土壤,设置4个温度水平(5、15、25、35℃),对两种土壤的轻组、重组及全土进行63 d的培养试验.结果表明:两种土壤全土的呼吸均高于轻组和重组.旱耕土重组的呼吸高于轻组,水稻土重组和轻组的呼吸在5~25℃温度水平下无显著差异,但35℃下重组高于轻组.在不同温度水平下,旱耕土轻组、重组和全土累积呼吸量分别占其初始碳的0.3%~2.8%、0.4%~3.7%和0.6%~7.0%,水稻土分别占其初始碳的0.4%~3.0%、0.3%~3.8%和0.7%~5.3%.两种土壤全土及轻、重组呼吸的温度敏感性(Q10)均随温度升高和培养时间延长而降低;水稻土重组的Q10高于轻组,旱耕土重组和轻组Q10的差异无明显规律.在5~25℃温度水平下,旱耕土全土Q10显著高于水稻土,但在25~35℃下低于水稻土.说明平邑旱耕土有机碳矿化强度高于桃江水稻土,且对温度变化的响应总体比水稻土更敏感.
In order to investigate the respiration of different components of farmland soils and their responses to temperature changes, four soil temperature levels (5, 15, 25 and 35 ℃) were selected for paddy soils in Pingyi, Shandong Province and Taojiang paddy soils in Hunan Province. The results showed that the respiration of the two soils was higher than that of the light group and the reorganization.The respiration of the reorganized dry land was higher than that of the light group and the resumption of the paddy soil reorganization and light group Respiration did not show significant difference at 5-25 ℃, but was higher at 35 ℃ than light group. At different temperature levels, the cumulative respiration rate of light, restructured and whole soil in dryland was 0.3% -2.8% %, 0.4% -3.7% and 0.6% -7.0%, respectively, and paddy soil accounted for 0.4% -3.0%, 0.3% -3.8% and 0.7% -5.3% of their initial carbon respectively. (Q10) decreased with the increase of temperature and culture time.The Q10 of paddy soil reorganization was higher than that of light group, but there was no obvious difference in Q10 between dry land and light group.Under the temperature of 5-25 ℃, The content of Q10 in dryland soil was significantly higher than that in paddy soil, but lower than paddy soil at 25 ~ 35 ℃, indicating that the organic carbon mineralization intensity of dryland soil in Pingyi was higher than that of peach River paddy soil, and the overall response to temperature changes more sensitive than paddy soil.