Photosynthetic Characteristics of Sorghum sudanense Under Different Water-retaining Treatments

doi:10.11924/j.issn.1000-6850.casb20200100035

Abstract

Abstract:

To study the physiological response of plants to different water-retaining measures in ecological restoration of mining area, the authors used CIRAS-2 (PP-Systems) photosynthesis instrument to determine the photosynthetic index of Sorghum sudanense, which often used to repair plant, and discussed the physiological response of Sorghum sudanense to different water-retaining measures under high temperature. The results showed that the daily change of photosynthetic rate Pn and instantaneous water use efficiency WUE presented a “W” curve, and the Tr diurnal change of transpiration rate was a “M” curve. The Pn of Sorghum sudanense had the phenomenon of lunch break, which was mainly affected by non-stomatal factor. The main environmental factors affecting the Sorghum sudanense Pn and Tr were atmospheric CO₂ concentration Ca, atmospheric temperature Tc and atmospheric relative humidity RH. Covering burning stone on the soil and adding fly ash could both significantly increase the Pn and WUE of Sorghum sudanense and enhance the adaptability of Sorghum sudanense to high temperature environment. From the index of Pn, the treatment of soil surface covered with burning stone was better than the treatment of adding fly ash in soil, but the effect of the both at the same time was slightly lower than that of using burning stone alone, and the reason needs to be further studied.

Key words: water retaining, Sorghum sudanense, net photosynthetic rate, mining area, ecological restoration

CLC Number:

Li Yun, Wang Meng, Ma Yili, Luo Yanli, Zhang Jiwei, Shi Wei, Ma Hao. Photosynthetic Characteristics of Sorghum sudanense Under Different Water-retaining Treatments[J]. Chinese Agricultural Science Bulletin, 2020, 36(36): 44-49.

Figures/Tables 8

References 25

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样品	pH	速效磷/(mg/kg)	速效钾/(mg/kg)	有机质/(g/kg)	总盐/(g/kg)	全钾/(g/kg)	全磷/(g/kg)	全氮/(g/kg)
荒漠土	8.62	1.00	1010.55	7.98	7.33	2.13	0.12	0.06
粉煤灰	9.63	0.85	302.08	8.63	3.87	0.89	0.62	0.06

样品	pH	速效磷/(mg/kg)	速效钾/(mg/kg)	有机质/(g/kg)	总盐/(g/kg)	全钾/(g/kg)	全磷/(g/kg)	全氮/(g/kg)
荒漠土	8.62	1.00	1010.55	7.98	7.33	2.13	0.12	0.06
粉煤灰	9.63	0.85	302.08	8.63	3.87	0.89	0.62	0.06

编号		PAR	RH	Ca	Tc	Tl	VPD	ω
Pn	W1	-0.380^*	-0.144^*	0.604^**	-0.113	-0.077	-0.086	0.846^**
	W2	0.514^**	0.476^**	0.666^**	0.129	-0.038	-0.452^**	0.723
	W3	-0.098	0.130	0.664^**	-0.300^*	-0.443^**	-0.437^**	0.756
	W4	0.531^**	0.091	0.740^**	-0.171	-0.192	-0.202	0.380
Tr	W1	0.231	0.726^**	-0.549^**	0.685^**	0.446^**	0.122	0.845^*
	W2	0.240	0.679^**	-0.286	0.844^**	0.527^**	-0.298^*	-0.668
	W3	0.582^**	0.824^**	-0.584^**	0.789^**	0.611^**	-0.355^*	0.047
	W4	0.193	0.774^**	-0.519^**	0.680^**	0.439^**	-0.253	-0.585

编号		PAR	RH	Ca	Tc	Tl	VPD	ω
Pn	W1	-0.380^*	-0.144^*	0.604^**	-0.113	-0.077	-0.086	0.846^**
	W2	0.514^**	0.476^**	0.666^**	0.129	-0.038	-0.452^**	0.723
	W3	-0.098	0.130	0.664^**	-0.300^*	-0.443^**	-0.437^**	0.756
	W4	0.531^**	0.091	0.740^**	-0.171	-0.192	-0.202	0.380
Tr	W1	0.231	0.726^**	-0.549^**	0.685^**	0.446^**	0.122	0.845^*
	W2	0.240	0.679^**	-0.286	0.844^**	0.527^**	-0.298^*	-0.668
	W3	0.582^**	0.824^**	-0.584^**	0.789^**	0.611^**	-0.355^*	0.047
	W4	0.193	0.774^**	-0.519^**	0.680^**	0.439^**	-0.253	-0.585