静风下土壤水分胁迫的栓皮栎幼苗气候空间上限列线

doi:10.16843/j.sswc.2017.06.009

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Abstract [Background] The Series Lines of Climate Space Up Limit (SLCSUL) of Quercus variabilis seedlings are important characteristics which may reflect more accurate temperature index of heat stress of high temperature. We had determined the serial lines of climate space of Q. variabilis seedlings in conditions of fully water supplied and different wind speeds. In this study we explored the leaf temperature of Q. variabilis seedlings changing with solar radiation, air temperature in condition of different soil moistures.[Methods] In the sunny weather conditions, controlling microclimate factor of wind speed under 0.2 m/s, and controlling different soil moisture conditions, the leaf and air temperature difference (LATD) of Q. variabilis seedlings were measured and the relation between LATD and the solar radiation were analyzed. Because leaf temperature index plus LATDs are leaf temperatures corresponding to different LATDs, the linear relation of LATD and the solar radiation was transformed into relation of leaf temperature and the solar radiation. According to the linear relation of leaf temperature and the solar radiation, leaf temperature increases with solar radiation increasing. This means solar radiation contracts climate space of Q. variabilis seedlings. Consulting D. M. Gates' climate space graphical method, overturn the regression line of leaf temperature and solar radiation, the SLCSUL of Q. variabilis seedlings were drawn.[Results] 1) The solar radiation was main factor of LATD, and LATD increased with solar radiation in clear and no wind weather. The relationship of LATD and solar radiation was remarkably linear relation. 2) The slope of linear relation of LATD and solar radiation decreased with soil moisture increasing. 3) In noon time, and in serious soil drought condition (soil moisture was 5%), the leaf temperature of Q. variabilis seedlings was 3℃ higher than in appropriate soil moisture condition.[Conculsions] We concluded that in different soil moisture conditions the leaf temperature of Q. variabilis seedlings increased with solar radiation increasing and the slope of LATD of different solar radiation decreased with soil moisture increasing. The LATD of different soil moisture changing with solar radiation was quite similar to the results of our former studies in different wind speed conditions, and it had the similar SLCSUL. Combining results of this paper with SLCSUL of different wind speed, the characteristics of climate space of Q. variabilis seedlings of 4 factors such as solar radiation, air temperature, soil moisture, and wind speed will be obtained. Therefore, the results of this paper may provide the basis for determining precise leaf temperature index of heat stress with multiple agro-meteorological factors. This paper enriches plant climate space theory and provides guidance for heat stress leaf temperature index determination of other plants, including crops, when multiple agro-meteorological factors are needed to be analyzed.

Key words： Quercus variabilis LATD climate space solar radiation soil moisture

Received: 26 December 2016

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S157

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	WANG Qian
	LIU Linqi
	WANG Peishu
	CAO Jing
	CHEN Jingling
	ZHANG Jingshong
	KOU Yuanbo

Cite this article:

WANG Qian,LIU Linqi,WANG Peishu, et al. Series lines of climate space up limit of Quercus variabilis seedlings in static wind and different soil water stress[J]. SSWC, 2017, 15(6): 73-80.

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http://journal12.magtechjournal.com/Jweb_stbc/EN/10.16843/j.sswc.2017.06.009 OR http://journal12.magtechjournal.com/Jweb_stbc/EN/Y2017/V15/I6/73

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