利用植物气体交换参数确定萎蔫系数的方法
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1.西北农林科技大学黄土高原侵蚀与旱地农业国家重点实验室;2.中国科学院水利部水土保持研究所

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国家自然科学基金(41977016)


Determination of Wilting Coefficient by Using the Plant Gas Exchange Parameters
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1.State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A &2.F University;3.Institute of Soil and Water Conservation, CAS

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the National Natural Science Foundation of China (No.41977016)

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    摘要:

    萎蔫系数是确定土壤有效水范围、储量和对植物有效性的关键因子,但现有的基于植物形态变化测定的萎蔫系数存在生理意义不明确及难以在田间原位测定的缺陷。为此,本研究利用自然干旱下的盆栽试验,测定了2种土壤质地(黄土高原区黄绵土和南方丘陵区红壤)下4种植物(大豆Glycine max L.、向日葵Helianthus annuus L.、苜蓿Medicagosativa L、羊草Leymuschinensis (Trin.) Tzvel)幼苗的萎蔫系数及叶片气体交换参数对土壤水分含量变化的动态响应过程,探讨了基于植物气体交换参数确定的土壤水分下限阈值与萎蔫系数的关系。结果表明:(1)土壤质地和植物抗旱性显著影响萎蔫系数,且影响在永久萎蔫时对应的土壤水势。4种植物在黄绵土下的萎蔫系数分别为0.083 cm3·cm-3(向日葵)>0.081 cm3·cm-3(大豆)>0.072 cm3·cm-3(羊草)>0.060 cm3·cm-3(苜蓿),在红壤下的萎蔫系数表现为0.188 cm3·cm-3(向日葵)>0.180 cm3·cm-3(大豆)>0.174 cm3·cm-3(羊草)>0.172 cm3·cm-3(苜蓿)。4种植物在红壤上的萎蔫系数均大于黄绵土,且植物抗旱性越强,其萎蔫系数越低。(2)利用三次函数模拟气孔导度变化确定的土壤水分下限阈值与萎蔫系数存在高度一致性,提出了一种间接估算萎蔫系数的方法。

    Abstract:

    【Objective】The wilt coefficient is a key factor in determining the effective soil water range, reserves and availability to plants. However, the existing wilting coefficient based on plant morphological changes has the disadvantages of unclear physiological significance and is difficult to determine in the field. 【Method】To this end, this study used a pot experiment under dry-down drought to determine the wilting coefficients of 4 plant seedlings (Glycine max L, Helianthus annuus L, Medicagosativa L, and Leymuschinensis (Trin.) Tzvel) grown under two soil textures (Loess soil in the Loess Plateau and Red soil in the southern hilly area). We evaluated the dynamic response of leaf gas exchange parameters to changes in soil moisture content, the relationship between the lower threshold of soil moisture determined based on plant gas exchange parameters, and the wilting coefficient. 【Result】The results showed that: (1) Soil texture and plant drought resistance significantly affected the wilting coefficient of plants and the corresponding soil water potential at permanent wilting. The wilting coefficients of all four plants were greater on the Red than on Loessial soil. Importantly, the stronger the drought resistance of a plant, the lower its wilting coefficient. The wilting coefficients of the four plants under Loessial soil were 0.083 cm3·cm-3 (Helianthus annuus L)> 0.081 cm3·cm-3 (Glycine max L.)> 0.072 cm3·cm-3 (Leymuschinensis (Trin.) Tzvel)> 0.060 cm3·cm-3 (Medicagosativa L). Also, the wilting coefficient under Red soil were 0.188 cm3·cm-3 (Helianthus annuus L)> 0.180 cm3·cm -3 (Glycine max L.)> 0.174 cm3·cm-3 (Leymuschinensis (Trin.) Tzvel)> 0.172 cm3·cm-3 (Medicagosativa L). (2) The soil moisture lower threshold determined by using a cubic function to simulate the change of stomatal conductance was highly consistent with the measured wilting coefficient. Thus, this presents an indirect method for estimating the wilting coefficient.

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引用本文

周谷,李秧秧,樊军.利用植物气体交换参数确定萎蔫系数的方法[J].土壤学报,,[待发表]
Zhou Gu, Li Yang Yang, Fan Jun. Determination of Wilting Coefficient by Using the Plant Gas Exchange Parameters[J]. Acta Pedologica Sinica,,[In Press]

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