夏玉米苗期主要生长指标的土壤水分临界点确定方法

生态学杂志

• 方法与技术 • 上一篇

夏玉米苗期主要生长指标的土壤水分临界点确定方法

麻雪艳^1,2,周广胜^1,3*

（¹中国气象科学研究院, 北京 100081； ^2南京信息工程大学应用气象学院, 南京 210044； ³南京信息工程大学气象灾害预警协同创新中心, 南京 210044）

出版日期:2017-06-10 发布日期:2017-06-10

A method to determine the critical soil moisture of growth indicators of summer maize in seedling stage.

MA Xue-yan^1,2, ZHOU Guang-sheng^1,3*

(¹ Chinese Academy of Meteorological Sciences, Beijing 100081, China; ^2 Nanjing University of Information Science and Technology, Nanjing 210044, China; ³ Collaborative Innovation Center on Forecast Meteorological Disaster Warning and Assessment, Nanjing University of Information Science & Technology, Nanjing 210044, China).

Online:2017-06-10 Published:2017-06-10

摘要/Abstract

摘要： 土壤水分不足是引起作物干旱的最主要因素。准确确定作物响应土壤水分的临界点对客观辨识、监测作物干旱的发生发展具有重要意义。本研究基于6个初始土壤水分的夏玉米持续干旱模拟试验，利用多元方差分析确定了较早响应土壤水分变化的玉米生长指标，并提出了基于正态总体统计容忍下限确定引起各指标发生显著性变化的临界土壤湿度的方法。结果表明：夏玉米苗期茎含水率、叶含水率、蒸腾速率、光合速率、气孔导度和叶面积较早响应土壤水分，其临界土壤水分(0～30 cm平均土壤相对湿度)分别为72%、65%、62%、60%、58%、46%，反映出随着土壤水分降低、干旱发生发展，玉米的茎含水率、叶含水率、蒸腾速率、光合速率、气孔导度和叶面积会依次受到影响。研究结果可为夏玉米苗期干旱发生发展的监测和定量评估提供依据，也为生态系统响应阈值的确定提供了思路。

关键词: 生物标志物, 分子水平, 减少降雨, 土壤有机质

Abstract: Deficit in soil moisture is the main cause of drought to crops. Accurate determination of crops’ responding thresholds to soil water is of great importance for identification and monitoring of the occurrence and development of crop drought. Based on the data of a progressive drought simulation experiment with six initial soil water levels on summer maize, oneway MANOVA was performed to identify maize growth indicators that respond earlier to soil water variations, and a way to identify their responding thresholds to soil water by using the statistic tolerance limits for normal populations was proposed. The results showed that the stem and leaf water content, transpiration rate, net photosynthetic rate, stomatal conductance, and leaf area of summer maize responded earlier to soil water in the seedling stage, and their corresponding critical soil moistures in terms of relative soil moisture at 0-30 cm depth were 72%, 65%, 62%, 60%, 58%, and 46%, respectively, indicating that the stem water content, leaf water content, transpiration rate, net photosynthetic rate, stomatal conductance, and leaf area would be affected successively as the soil water decreased and drought occurred. These results could provide reference to the monitoring and quantitative assessment of the development of drought to summer maize during the seedling stage, and also a way to determine responding thresholds of ecosystems.

Key words: precipitation reduction, molecular level, biomarker, soil organic matter

麻雪艳1,2,周广胜1,3*. 夏玉米苗期主要生长指标的土壤水分临界点确定方法[J]. 生态学杂志.

MA Xue-yan1,2, ZHOU Guang-sheng1,3*. A method to determine the critical soil moisture of growth indicators of summer maize in seedling stage.[J]. cje.

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夏玉米苗期主要生长指标的土壤水分临界点确定方法

A method to determine the critical soil moisture of growth indicators of summer maize in seedling stage.

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