| 水分减少与增温处理对冬小麦生物量和土壤呼吸的影响 |
| 摘要点击 2136 全文点击 1244 投稿时间：2015-04-24 修订日期：2015-08-10 |
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| 中文关键词 水分减少 增温 冬小麦 生物量 土壤呼吸 |
| 英文关键词 reduced water diurnal warming winter wheat biomass soil respiration |
| 作者 | 单位 | E-mail | | 吴杨周 | 南京信息工程大学气象灾害预报预警与评估协同创新中心, 南京 210044
南京信息工程大学应用气象学院, 南京 210044 | yangzhou_wu@163.com | | 陈健 | 南京信息工程大学应用气象学院, 南京 210044 | | | 胡正华 | 南京信息工程大学气象灾害预报预警与评估协同创新中心, 南京 210044
江苏省农业气象重点实验室, 南京 210044
南京信息工程大学应用气象学院, 南京 210044 | zhhu@nuist.edu.cn | | 谢燕 | 南京信息工程大学应用气象学院, 南京 210044 | | | 陈书涛 | 江苏省农业气象重点实验室, 南京 210044
南京信息工程大学应用气象学院, 南京 210044 | | | 张雪松 | 江苏省农业气象重点实验室, 南京 210044
南京信息工程大学应用气象学院, 南京 210044 | | | 申双和 | 南京信息工程大学气象灾害预报预警与评估协同创新中心, 南京 210044
江苏省农业气象重点实验室, 南京 210044 | yqzhr@nuist.edu.cn | | 陈曦 | 南京信息工程大学应用气象学院, 南京 210044 | |
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| 中文摘要 |
| 通过田间控制试验,设置对照(CK)、水分减少30%(W)、增温2℃(T)、水分减少30%+增温2℃(TW)这4种不同处理,利用静态箱-气相色谱法测定土壤呼吸,研究水分减少与增温处理对冬小麦生物量和土壤呼吸的影响. 结果表明,在拔节-孕穗期,T和TW显著增加了冬小麦地上生物量,增幅分别为46.0% (P=0.002)和19.8% (P=0.032); T和TW也显著增加了收获的地上生物量,增幅分别为19.8% (P=0.050)和34.6% (P=0.028); 而W对地上生物量无显著影响; W、T和TW处理都没有显著改变地下生物量. 相比于CK,T和W对土壤呼吸平均速率没有显著影响(P > 0.05); TW使土壤呼吸平均速率降低了22.4% (P=0.049). T降低了土壤呼吸温度敏感性系数(Q10). 本研究表明水分与增温的复合处理对农田生态系统产生了与单一因子处理不同的生态效应. |
| 英文摘要 |
| Field experiments were conducted in winter wheat-growing season to investigate the effect of reduced water and diurnal warming on wheat biomass and soil respiration. The experimental treatments included the control (CK), 30% reduced water (W), diurnal warming (T, enhanced 2℃), and the combined treatment (TW, 30% reduced water plus diurnal warming 2℃). Soil respiration rate was measured using a static chamber-gas chromatograph technique. The results showed that in the winter wheat-growing season, compared to CK, T and TW treatments significantly increased shoot biomass by 46.0% (P=0.002) and 19.8% (P=0.032) during the elongation-booting stage, respectively. T and TW treatments also significantly increased the harvested shoot biomass by 19.8% (P=0.050) and 34.6% (P=0.028), respectively. On the other hand, W treatment had no significant effect on shoot biomass, and W, T, and TW treatments didn't significantly change the root biomass. T and W treatments had no significant effect on the mean respiration rate (MRR) of soil (P > 0.05). TW treatment significantly decreased soil MRR by 22.4% (P=0.049). We also found T treatment decreased the temperature sensitivity coefficients of soil respiration (Q10). The results of our study suggested that compared to the single treatment (reduced water or diurnal warming), the combined treatment (reduced water plus diurnal warming) may have different effects on agroecosystem. |
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