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保水剂与基质水分对侧柏水分利用特征的影响
刘潇阳1, 王进鑫2
1.西北农林科技大学 水土保持研究所, 陕西 杨凌 712100;2.西北农林科技大学 资源环境学院, 陕西 杨陵 712100
摘要:
[目的] 研究基质含水量和保水剂浓度对侧柏水势、水分利用效率和蒸腾速率的影响,为不同降雨地区铅锌尾矿库植被重建与生态恢复中保水剂的科学施用提供理论依据和技术支撑。[方法] 以一年生侧柏为研究对象,采用二次通用旋转组合设计,测定侧柏水势、净光合速率、蒸腾速率,计算水分利用效率,建立侧柏水势(ψ)、水分利用效率(WUE)、蒸腾速率(Tr)与保水剂浓度和基质含水量之间的回归模型,分析基质含水量和保水剂浓度对侧柏水势、水分利用效率、蒸腾速率的影响。[结果] ①水势和蒸腾速率的回归模型主效应顺序为:基质含水量>保水剂浓度;水分利用效率的回归模型中保水剂浓度>基质含水量;②水势最高时保水剂浓度为0.1%,基质含水量为19.73%;水分利用效率最大时保水剂浓度为0.1%,基质含水量为7.89%,蒸腾速率最小时保水剂浓度为1%,基质含水量为7.89%。[结论] 使用0.1%~0.23%低保水剂浓度,有利于侧柏从改良铅锌尾矿基质中获取水分,起到促进叶片二氧化碳固定,提高水分利用效率的作用。
关键词:  铅锌尾矿  改良尾矿砂基质  侧柏  水势  蒸腾速率  水分利用效率
DOI:10.13961/j.cnki.stbctb.2020.02.030
分类号:S152.7;S728
基金项目:陕西省科技统筹计划项目"铅锌矿区尾矿库生态修复关键技术研究与示范"(2016KTCL03-18)
Effects of Super Absorbent Polymer and Substrate Water Content on Water Use Characteristics of Platycladus Orientalis
Liu Xiaoyang1, Wang Jinxin2
1.Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, China;2.College of Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China
Abstract:
[Objective] The effects of substrate water content and super absorbent polymer on the water potential, water use efficiency and transpiration rate of Platycladus orientalis were studied, in order to provide theoretical basis and technical support for the application of super absorbent polymer in vegetation reconstruction and ecological restoration of lead-zinc tailings ponds in areas with different rainfall.[Methods] The test used a quadratic general rotation combination design. The measured indicators included the water potential, net photosynthetic rate, transpiration rate, and water use efficiency of the annual Platycladus orientalis. A regression model between the water potential(ψ) of the leaf, the water use efficiency (WUE), transpiration rate (Tr) and the concentration of super absorbent polymer and substrate water content was fitted.[Results] ① The main effect sequence of the regression model of water potential and transpiration rate was:substrate water content > concentration of super absorbent polymer; the main effect sequence for the regression model of water use efficiency was:concentration of super absorbent polymer > substrate water content. ② When the water potential reached the highest point, the concentration of super absorbent polymer applied was 0.1%, the substrate water content was 19.73%; when the water use efficiency was highest, the concentration of super absorbent polymer applied was 0.1%, the substrate water content is 7.89%; when the transpiration rate was the minimum optimal, the concentration of super absorbent polymer applied was 1%, and the substrate water content was 7.89%.[Conclusion] Low super absorbent polymer application amount (0.1%~0.23%) is beneficial to the extraction of water from the modified lead-zinc tailings matrix, which also promotes the fixation of carbon dioxide in the leaves and improves the water use efficiency.
Key words:  lead-zinc tailings  improved tailings sand matrix  Platycladus orientalis  water potential  water use efficiency  transpiration rate