盐碱胁迫下松嫩草地2种生态型羊草根际效应及光合生理响应

doi:10.3864/j.issn.0578-1752.2020.13.007

Abstract

Abstract:

【Objective】 This study was designed to explore differences in rhizosphere effects and photosynthetic physiological activities between the grey green (GG) and yellow green (YG) ecotypes of Leymus chinensis (L. chinensis) in Songnen plains in response to saline-alkali stress, and to provide a theoretical basis for selecting the ecotype of L. chinensis suitable for the restoration of degraded saline-alkali grasslands. 【Method】 Using a pot experiment, the changes of soil and plant under the control, moderate salt-alkaline stress and severe salt-alkaline stress treatments for 30 days were studied, including pH, electrical conductivity, total organic carbon content, total nitrogen content, NH₄ ⁺-N content, NO₃^--N content, microbial biomass carbon content and microbial biomass nitrogen content of rhizosphere soil and bulk soil, as well as leaf net photosynthetic rate, leaf proline content, leaf soluble sugar content and plant height, aboveground biomass and belowground biomass of the two ecotypes of L. chinensis. The moderate saline-alkali stress was achieved by mixing 40 mmol·L ^-1 NaCl solution, 40 mmol·L^-1 Na₂CO₃ solution, 360 mmol·L^-1 Na₂SO₄ solution and 360 mmol·L^-1 NaHCO₃ solution at 1﹕1﹕1﹕1. The severe saline-alkali stress treatment was reached by mixing 200 mmol·L^-1 NaCl solution, Na₂SO₄solution, NaHCO₃ solution and Na₂CO₃ solution at 1﹕1﹕1﹕1. 【Result】 The NH₄⁺-N content, NO₃^--N content, available nitrogen content, microbial biomass carbon content and microbial biomass nitrogen content of rhizosphere and bulk soil under the moderate salt-alkaline stress treatment were significantly higher than those under the severe salt-alkaline stress treatment. For both ecotypes, the rhizosphere soil had a significantly lower pH value than that of the bulk soil. Moreover, the rhizosphere soil had greater available nitrogen content, microbial biomass carbon content and microbial biomass nitrogen content relative to the bulk soil. The rhizosphere effects of pH in the GG ecotype of L. chinensis were significantly higher than that of the YG ecotype under the control and moderate salt-alkaline stress treatment. The rhizosphere effects of available nitrogen content and microbial biomass carbon content in the GG ecotype of L. chinensis were significantly higher than those of the YG ecotype. For both ecotypes, the net photosynthetic rate, leaf soluble sugar content and leaf proline content under the moderate salt-alkaline stress treatment were significantly higher than those under the severe salt-alkaline stress treatment. The aboveground biomass, belowground biomass and total biomass under the salt-alkaline stress treatments were significantly lower than those under the control treatment. The loss rate of plant height and belowground biomass, and harm percentage of net photosynthetic rate in the YG ecotype of L. chinensis were significantly higher than them in the GG ecotype. Compared to the YG ecotype, the GG ecotype had significantly higher sensitive indexes of leaf proline content, leaf soluble sugar content and osmotic pressure. 【Conclusion】 The GG ecotype of L. chinensis could more effectively alleviate the adverse effects of saline-alkali stress on soil physical and chemical properties and showed stronger saline-alkali resistance than the YG ecotype.

Key words: salt-alkaline stress, grey green ecotype of L. chinensis, yellow green ecotype of L. chinensis, rhizosphere effect, photosynthetic physiology

YAO Yuan,XU YueQiao,WANG Gui,SUN Wei. Salt-Alkalinze Stress Induced Rhizosphere Effects and Photosynthetic Physiological Response of Two Ecotypes of Leymus chinensis in Songnen Meadow Steppe[J].Scientia Agricultura Sinica, 2020, 53(13): 2584-2594.

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Figures/Tables 6

Table 1

The response of soil physicochemical properties of bulk soil and rhizosphere soil of grey green (GG) and yellow green (YG) ecotypes of L. chinensis to the salt-alkaline stress"

土壤理化性质 Soil physicochemical property	处理 Treatment	灰绿型羊草 (GG)		黄绿型羊草 (YG)
土壤理化性质 Soil physicochemical property	处理 Treatment	非根际土 Bulk soil	根际土 Rhizosphere soil	非根际土 Bulk soil	根际土 Rhizosphere soil
pH	对照组CK	8.46±0.01Ca	8.27±0.02Cb	8.53±0.03Ca	8.44±0.02Cb
	中度盐碱MS	9.22±0.05Ba	8.98±0.05Bb	9.20±0.04Ba	8.99±0.04Bb
	重度盐碱SS	9.87±0.04Aa	9.66±0.02Ab	9.77±0.04Aa	9.62±0.04Ab
电导率 Electrical conductivity (μs·cm^-1)	对照组CK	174.25±27.92Ca	135.5±9.37Ba	133.25±9.11Cb	213.50±12.14Ba
	中度盐碱MS	1191.25±11.27Bb	1248.0±16.7Aa	1229.75±7.55Ba	1259.50±25.65Aa
	重度盐碱SS	1270.25±10.96Aa	1181.5±64.85Aa	1318.50±14.75Aa	1198.25±68.38Aa
总有机碳含量 Total organic carbon content (g·kg^-1)	对照组CK	6.08±0.07Aa	6.19±0.07Aa	6.15±0.05Aa	6.30±0.05Aa
	中度盐碱MS	6.06±0.05Aa	6.15±0.08Aa	5.82±0.23Ba	6.03±0.05Aa
	重度盐碱SS	6.06±0.03Aa	6.1±0.06Aa	5.71±0.16Ba	5.88±0.06Aa
总氮含量 Total nitrogen content (g·kg^-1)	对照组CK	1.40±0.1Aa	1.53±0.13Aa	1.08±0.1Aa	1.17±0.06Aa
	中度盐碱MS	1.16±0.07ABb	1.4±0.03Aa	0.84±0.05Aa	0.92±0.02Ba
	重度盐碱SS	0.85±0.16Bb	1.28±0.02Aa	0.83±0.09Aa	0.87±0.03Ba
铵态氮含量 NH₄⁺-N content (mg·kg^-1)	对照组CK	0.96±0.04Ab	3.33±0.24Aa	1.86±0.12Ab	6.51±0.42Aa
	中度盐碱MS	0.79±0.05Bb	3.06±0.4Aa	1.37±0.06Bb	6.02±0.35Aa
	重度盐碱SS	0.44±0.03Cb	1.37±0.19Ba	0.89±0.04Cb	3.31±0.22Ba
硝态氮含量 NO₃^--N content (mg·kg^-1)	对照组CK	3.76±0.32Aa	4.03±0.12Aa	4.02±0.09Aa	4.43±0.26Aa
	中度盐碱MS	2.46±0.33Ba	3.17±0.1Ba	2.78±0.3Ba	2.84±0.31Ba
	重度盐碱SS	0.59±0.02Cb	0.82±0.02Ca	0.35±0.02Ca	0.44±0.05Ca
有效氮含量 Available nitrogen content (mg·kg^-1)	对照组CK	4.37±0.19Ab	7.28±0.5Aa	6.1±0.28Ab	10.70±0.21Aa
	中度盐碱MS	3.36±0.16Bb	6.02±0.22Ba	3.56±0.2Bb	8.32±0.42Ba
	重度盐碱SS	1.09±0.04Cb	1.97±0.14Ca	1.23±0.08Cb	3.39±0.14Ca

Table 1

Fig. 1

Fig. 3

Table 2

Fig. 4

Fig. 2

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生长及生理指标 Physiology and growth indicator	羊草类型 L. chinensis ecotypy	处理Treatment
生长及生理指标 Physiology and growth indicator	羊草类型 L. chinensis ecotypy	对照组CK	中度盐碱MS	重度盐碱SS
株高Plant height (cm/plant)	灰绿型 (GG)	44.9±0.91a	40.65±0.82b	36.19±0.81c
株高Plant height (cm/plant)	黄绿型 (YG)	46.44±0.78a	38.17±0.54b	34.74±0.34c
地上生物量 Aboveground biomass (g/pot)	灰绿型 (GG)	9.89±0.22a	7.32±0.31b	7.02±0.23b
地上生物量 Aboveground biomass (g/pot)	黄绿型 (YG)	10.02±0.25a	8.22±0.35b	7.6±0.51b
地下生物量 Belowground biomass (g/pot)	灰绿型 (GG)	6.05±0.29a	4.43±0.14b	4.12±0.25b
地下生物量 Belowground biomass (g/pot)	黄绿型 (YG)	5.5±0.2a	4.05±0.2b	3.66±0.3b
总生物量 Total biomass (g/pot)	灰绿型 (GG)	15.94±0.37a	11.75±0.4b	11.14±0.42b
总生物量 Total biomass (g/pot)	黄绿型 (YG)	15.52±0.36a	12.27±0.5b	11.26±0.79b
根冠比 Root/shoot ratio	灰绿型 (GG)	0.61±0.03a	0.61±0.02a	0.59±0.03a
根冠比 Root/shoot ratio	黄绿型 (YG)	0.55±0.02a	0.49±0.02ab	0.48±0.02b
净光合速率 Net photosynthetic rate (μmol CO₂·m^-2·s^-1)	灰绿型 (GG)	21.13±0.4a	16.62±0.19b	12.2±0.56c
净光合速率 Net photosynthetic rate (μmol CO₂·m^-2·s^-1)	黄绿型 (YG)	21.85±0.36a	14.93±0.5b	11.1±0.23c
叶片可溶性糖含量 Leaf soluble sugar content (mg·g^-1 DW)	灰绿型 (GG)	81.09±4.6b	97.15±4.22ab	109.21±6.8a
叶片可溶性糖含量 Leaf soluble sugar content (mg·g^-1 DW)	黄绿型 (YG)	73.96±1.49c	83.17±1.1b	89.8±1.32a
叶片脯氨酸含量 Leaf proline content (μmol·g^-1 DW)	灰绿型 (GG)	0.57±0.07c	1.41±0.14b	1.89±0.2a
叶片脯氨酸含量 Leaf proline content (μmol·g^-1 DW)	黄绿型 (YG)	0.61±0.10c	1.33±0.12b	1.59±0.15a

Salt-Alkalinze Stress Induced Rhizosphere Effects and Photosynthetic Physiological Response of Two Ecotypes of Leymus chinensis in Songnen Meadow Steppe

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