四翅滨藜和多枝柽柳对土壤干旱的响应差异

doi:10.13866/j.azr.2023.12.13

Abstract

Abstract:

To construct shelter forests in arid areas, selecting plant species with strong stress tolerance and adaptability is key. By simulating a pot water control experiment with different drought gradients, the ecological adaptability of the introduced plant Atriplex canescens and the native plant Tamarix ramosissima willow to drought stress were compared. The results showed that (1) With an increase in drought degree, the water content in the A. canescens and T. ramosissima leaves reduced gradually, and the water retention capacity, proline content, and relative conductivity gradually increased. The soluble sugar and malondialdehyde contents of A. canescens and T. ramosissima were the maximum in mild and severe drought, respectively, and the increase rate was greater in T. ramosissima. (2) The POD activity of A. canescens and T. ramosissima increased gradually, and under severe drought, the percentage increase of T. ramosissima compared with the control was approximatelythree times that of A. canescens; SOD activity was greatest under moderate drought, and the percentage increase in T. ramosissima compared with the control was approximatelyfive times that of A. canescens. The changes in the activity of both enzymes of T. ramosissima were greater than those of A. canescens. (3) The chlorophyll content of A. canescens and T. ramosissima were mildly dry > control > moderate drought > severe drought, the net photosynthetic rate, transpiration rate, stomatal conductance, and intercellular carbon dioxide concentration of T. ramosissima gradually decreased, and mild drought slightly promoted chlorophyll and photosynthetic capacity of A. canescens. (4) The correlation and principal component analysis results indicated that the relationship between the T. ramosissima traits was closer under drought stress, and the relationship between traits and traits was difficult to change in A. canescens, which was relatively conservative. Conclusion: A. canescens is less affected by drought stress, and its drought adaptability is slightly stronger than that of T. ramosissima.

Key words: Atriplex canescens, Tamarix ramosissima, physiological characteristics, drought adaptability

HU Huanqiong, LI Li, YU Jun, LIANG Hailian, LYU Ruiheng. Differences in the response to soil drought in Atriplex canescens and Tamarix ramosissima[J].Arid Zone Research, 2023, 40(12): 2007-2015.

Figures/Tables 8

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References 29

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水分处理	田间持水量/%	土壤含水量/%
CK(对照)	70~80	17~19
W₁(轻度干旱)	50~60	12~14
W₂(中度干旱)	30~40	7~10
W₃(重度干旱)	10~20	4~5

物种	土壤水分梯度	相对含水量/%	保水力/%
四翅滨藜	CK	88.19±1.19a	39.59±2.63c
	W₁	82.77±0.98b	47.96±3.10b
	W₂	81.49±1.10b	60.10±2.65a
	W₃	75.48±0.26c	60.55±0.58a
多枝柽柳	CK	80.74±0.0.38a	21.04±1.74a
	W₁	78.65±1.00b	27.92±0.80b
	W₂	76.33±1.07c	30.65±1.47b
	W₃	72.93±1.58d	35.36±1.96a

物种	土壤水分梯度	相对电导率/%	丙二醛含量/(nmol·g^-1 FW)	SOD活性/(U·g^-1 FW)	POD活性/(U·g^-1 FW)
四翅滨藜	CK	28.77±2.32b	10.65±1.06b	453.89±25.07b	2778.88±394.59b
	W₁	35.63±3.95a	12.41±1.36a	506.67±26.01b	2852.65±252.10b
	W₂	37.26±3.74a	12.39±0.07a	586.30±21.97a	3816.76±790.90ab
	W₃	39.24±3.41a	10.08±0.09ab	383.14±41.63c	4219.25±551.46a
多枝柽柳	CK	26.75±0.49c	5.56±0.01c	321.74±20.69b	8.90±1.93c
	W₁	32.32±3.38b	7.53±0.05b	783.42±98.13a	15.73±1.88b
	W₂	35.09±2.60b	7.31±0.56b	847.98±36.66a	17.68±2.22ab
	W₃	37.80±1.42a	14.18±1.33a	309.45±45.72b	23.00±4.84a

树种	土壤水分梯度	净光合速率/(μmol·m^-2·s^-1)	气孔导度/(mol·m^-2·s^-1)	蒸腾速率/(mmol·m^-2·s^-1)	水分利用效率/(μmol CO₂ ·mmol^-1H₂O)
四翅滨藜	CK	17.37±0.93b	0.10±0.01b	2.61±0.12b	6.66±0.42a
	W₁	18.80±0.43a	0.13±0.01a	2.77±0.02a	6.79±0.17a
	W₂	13.96±0.12c	0.07±0.02c	2.36±0.04c	5.91±0.14b
	W₃	9.43±0.23d	0.05±0.01c	1.43±0.04d	6.56±0.12a
多枝柽柳	CK	22.03±0.31a	0.16±0.01a	3.25±0.15a	6.80±0.36a
	W₁	15.77±0.64b	0.12±0.00b	2.40±0. 03b	6.57±0.20a
	W₂	9.88±0.33c	0.10±0.00c	2.02±0.03c	4.89±0.23b
	W₃	7.66±0.17d	0.10±0.00c	1.86±0.06d	4.12±0.23c

主成分指标	四翅滨藜			多枝柽柳
主成分指标	PC1	PC2	PC3	PC1	PC2
RWC	0.734	-0.66	0.092	0.955	0.062
WRC	-0.72	0.522	0.396	-0.943	0.096
RC	-0.52	0.692	0.103	-0.882	0.227
MDA	0.369	0.419	0.676	-0.830	-0.379
Chla	0.826	0.54	-0.039	0.938	0.241
Chlb	0.863	0.488	-0.046	0.916	0.320
Car	0.692	0.695	0.017	0.935	0.239
TC	0.837	0.528	-0.036	0.937	0.254
SOD	0.352	-0.026	0.838	-0.007	0.980
POD	-0.798	0.29	0.12	-0.863	0.052
PRO	-0.798	0.51	-0.091	-0.907	-0.057
SS	0.241	0.824	-0.242	-0.651	0.527
Pn	0.966	-0.175	0.048	0.979	-0.174
Gs	0.94	0.051	-0.089	0.883	-0.425
Tr	0.918	-0.235	0.287	0.926	-0.316
WUE	0.383	0.16	-0.855	0.964	0.121
特征值	8.333	3.791	2.245	12.259	2.059
贡献率/%	52.080	23.694	14.033	76.619	12.869
累积贡献率/%	52.080	75.774	89.807	76.619	89.488
权重	0.580	0.264	0.156	0.856	0.144

Differences in the response to soil drought in Atriplex canescens and Tamarix ramosissima

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