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Drought stress indexes of soil with different texture based on chlorophyll fluorescence parameters of Quercus variabilis seedling |
WANG Qian1, LI Mingwei1, LI Qiang1, CHEN Jingling1, YANG Xitian1, KOU Yuanbo1, ZHANG Jinsong2 |
1. College of Forestry, Henan Agricultural University, 450002, Zhengzhou, China; 2. Research Institute of Forestry, Chinese Academy of Forestry, 100091, Beijing, China |
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Abstract [Background] The drought stress index of Quercus variabilis is not perfect, and it can only be roughly divided into three levels: light, medium and heavy drought stress. In addition, it is not clear whether soil texture has a positive or negative effect on Q. variabilis seedlings. This work is to determine the texture effect of soil in the Xiaolangdi of the Yellow River on Q. variabilis seedlings photosynthesis and drought stress index. [Methods] Five different sample points(A, B, E, D and F) of soil and a soil sample point (C) in plain region were selected. 1-year old Q. variabilis seedlings were pot cultured.The pots were watered until saturated and then let dry naturely. Changes of chlorophyll fluorescence parameters of Q. variabilis seedling under different soil moisture were measured during the period. The chlorophyll fluorescence parameters of maximum quantum efficiency Fv/Fm and the actual quantum yield Y(Ⅱ) were used to analyze soil texture effect. The soil moistures of Fv/Fm and Y(Ⅱ) while starts decreasing and decreasing 50% were used as soil drought stress indices to analyze the differences among different soil texture types and then to determine the soil texture effect. [Results] 1) The changes of Fv/Fm and Y(Ⅱ) with the decrease of soil moisture content was simulated by power function, and the relationship coefficients of simulation were between 0.6 and 0.9. 2) The soil moistures θk of 6 sample points while Fv/Fm and Y(Ⅱ) started decreasing and θ50 while Fv/Fm and Y(Ⅱ) was decreasing 50% were determined. The significance test of ANOVA showed that the soil water stress indices of 6 sample points were divided into 2 categories, and passed the significance test of difference under the reliability of 0.05. The difference between A, B, D of sandy soil mountain land and C of plain area was not obvious. 3) Based on chlorophyll fluorescence parameters Fv/Fm and Y(Ⅱ), drought stress indexes of 6 sample points were obtained. The drought stress index of A, B, C and D was as follows: >13% no drought, >10%-13% mild drought, >8%-10% moderate drought, and >5%-8% severe drought. The drought stress index of E and F was: >19% no drought, >15%-19% mild drought, >13%-15% moderate drought, and >9%-13% severe drought. 4) θk and θ50 were closely correlated with clay and powder grains of soil grain size, and negatively correlated with sand grains. [Conculsions] The influence of soil texture on Q. variabilis seedlings soil moisture was "anti-texture effect", that is, the finer the soil texture is, the worse the soil water availability is, and higher the moisture index of soil under drought stress is higher. The higher the sand content is, the better the water availability is, and the lower the moisture index of soil drought is.
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Received: 06 May 2020
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