LAI Xuehui,LI Dan,YU Bofeng,et al.Effects of Soil Temperature and Water Content on Soil Respiration Rate During the Crop Growing Season in a Farm of Northern China[J].Research of Soil and Water Conservation,2016,23(01):117-122.
东北农场农作物生长季土壤呼吸对温度和含水量的响应
- Title:
- Effects of Soil Temperature and Water Content on Soil Respiration Rate During the Crop Growing Season in a Farm of Northern China
- Keywords:
- soil respiration rate; soil temperature; Q10; soil water content
- 分类号:
- S152
- 摘要:
- 通过静态碱液吸收法测定了东北典型农场水稻和玉米两种农作物在生长期（4—7月）的土壤呼吸速率及其变化规律，分析了不同深度的土壤呼吸速率对土壤温度和土壤含水量的响应。结果表明：在作物生长期，水稻样地的土壤呼吸速率高于玉米样地。水稻和玉米样地在0—15 cm深度的土壤呼吸速率明显高于15—30 cm和30—60 cm。随着土壤深度的增加，土壤呼吸速率逐渐减小。水稻土壤的呼吸速率最大值为580.6 μg/（kg·h），最小值为160.4 μg/（kg·h）；而玉米的土壤呼吸速率最大值为565.3 μg/（kg·h），最小值为137.5 μg/（kg·h）。水稻和玉米样地土壤呼吸速率与土壤温度呈现极显著相关关系（p<0.01），土壤温度曲线在4月到6月初明显上升，而土壤呼吸速率曲线在这一时段也呈相同态势；6月下旬到7月初土壤温度变化平稳，土壤呼吸速率与土壤温度的同步变化趋势不明显。同时，两种作物的土壤含水量与土壤呼吸速率间的相关性也极为显著（p<0.01），说明土壤含水量也能够解释生长期水稻和玉米的土壤呼吸速率变化。
- Abstract:
- Soil respiration rates of rice and maize fields during the growing season (from April to July) were measured by static alkali absorption method, and the effects of soil temperature and water content on soil respiration rates of a typical farm in Northern China were also examined. The results showed that the soil respiration rates of paddy field were higher than maize filed during the crop growing season, and soil respiration rates in 0—15 cm depth were significantly higher than that in 15—30 cm and 30—60 cm depths. Soil respiration rate decreased with the increase of soil depth. The maximum and minimum soil respiration rates of paddy field were 580.6 μg/(kg·h) and 160.4 μg/(kg·h), respectively, and the maximum and minimum values of maize field were 565.3 μg/(kg·h) and 137.5 μg/(kg·h), respectively. Soil respiration rates of rice and maize fields were found to be positively related to soil temperature (p<0.01). Soil temperature had been rising from April to June and the soil respiration rate also presented the same escalating trend; while soil temperature varied smoothly from late June to early July and the synchronous change trend between soil respiration and temperature was not obvious. Meanwhile, there was obvious correlation between soil respiration rate and water content in rice and maize fields (p<0.01), which indicated that soil water content can explain soil respiration rate change in rice and maize growing season.
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备注/Memo
收稿日期:2015-08-07;改回日期:2015-09-07。
基金项目:山西省高等学校科技创新项目“农业活动影响下的寒地土壤氮和有机碳运移机制及规律研究”（2014151）；山西省重点学科建设经费
作者简介:来雪慧(1984-),女,山西大同人,博士,讲师,主要从事农业面源、环境规划研究。E-mail:laixuehui@mail.bnu.edu.cn