WU Xiaofei,YANG Fan,YAN Xiaoying,et al.Response of Hydraulic Resistances of Soil-Robinia pseudoacacia System to Water Stress[J].Research of Soil and Water Conservation,2022,29(02):274-280.
土壤-刺槐系统水流阻力对水分胁迫的响应
- Title:
- Response of Hydraulic Resistances of Soil-Robinia pseudoacacia System to Water Stress
- 文章编号:
- 1005-3409(2022)02-0274-07
- Keywords:
- soil-Robinia pseudoacacia system; water stress; transpiration rate; water potential; hydraulic resistance
- 分类号:
- S152.7+5
- 文献标志码:
- A
- 摘要:
- 为探究土壤-刺槐系统水流阻力对水分胁迫的响应情况,通过盆栽试验方法设置8个水分梯度(田间持水量的30%～100%),研究了两年生刺槐在生长季内的蒸腾速率、根水势、叶水势及土壤-刺槐系统水流阻力等的变化。结果表明:(1)刺槐蒸腾速率、根水势及叶水势随水分含量的增加表现出先增大后保持稳定的趋势。蒸腾速率在30%～70%的田间持水量范围随水分含量的增加而迅速增大,根、叶水势在30%～50%的田间持水量范围增长最快,此后基本稳定;(2)土壤阻力、根系总阻力、植物传导阻力及叶-气阻力均随水分含量的增加而减小,均在30%～50%的田间持水量范围减小最快,其在生长季内大小为7月>10月>8月>9月;(3)土壤-刺槐系统总阻力的变化趋势与叶-气阻力相近,是由于叶-气阻力占总阻力的96.0%以上,并对总阻力的调节起主导作用。根据我们的研究结果推测刺槐在大于50%田间持水量范围,可保持健康、可持续生长。
- Abstract:
- To explore the response of hydraulic resistances in the soil-Robinia pseudoacacia system to water stress, changes of transpiration rate, root water potential, leaf water potential of the 2-year-old Robinia pseudoacacia and hydraulic resistances of soil-Robinia pseudoacacia system were identified and calculated by pot experiments under 8 water gradients which were 30%, 40%,…, and 100% of field capacity. The results showed that:(1)transpiration rate, root water potential, and leaf water potential of Robinia pseudoacacia showed a trend of increasing and then remaining stable with the improvement of soil water content, and transpiration rate increased in the range of 30%～70% of field capacity, while root water potential and leaf water potential increased in the range of 30%～50% of field capacity;(2)soil resistance, total root resistance, plant transportation resistance and leaf-air resistance decreased with the increment of the water content, especially in the range of 30%～50% of field capacity, and they changed slightly when the soil water content was above 50%; the values of each resistance decreased in the order: July>October>August>September;(3)the total hydraulic resistance of the soil-Robinia pseudoacacia system was similar to leaf-air resistance, as leaf-air resistance accounted for more than 96.0% of its value and played a predominant role in the adjustment of total hydraulic resistance. According to these results of the research, we speculate the plants of Robinia pseudoacacia can ensure heathy and sustainable growth in the soil with greater than 50% of field capacity.
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备注/Memo
收稿日期:2021-03-03 修回日期:2020-03-19
资助项目:中国科学院先导性项目B类子课题“黄土高原植被-水分相互作用及其对气候变化的响应过程”(XDB20020202)
第一作者:武小飞(1995—),男,陕西榆林人,硕士研究生,研究方向为土壤物理。E-mail:wuxiaofei@nwafu.edu.cn
通信作者:黄明斌(1968—),男,湖北荆门人,博士,研究员,主要从事生态水文和土壤物理研究。E-mail:hmbd@nwafu.edu.cn