水分和养分添加对内蒙古荒漠草原沙生针茅生长与生理特性及其敏感性的影响

doi:10.13866/j.azr.2021.02.20

Abstract

Abstract:

To explore the adaptive responses of dominant species in a desert steppe to environmental changes,we tested the effects of six treatments with two water levels (natural precipitation andartificial irrigation) and three nutrient levels (no nutrient addition, N addition and NPK addition) on the growth and physiology of Stipa glareosain Inner Mongolia. The results of two-wayANOVAshowed that the main factors(water andnutrients) and water × nutrientinteraction had significant effects on some of the growth and physiological parametersof S. glareosa (P<0.05). Water supplementation significantly increased the leaf fresh weight, leaf dry weight, plant height and relative electrical conductivity but decreased superoxide dismutase (SOD) activity. Both N and NPK addition increased leaf area. N addition increased malondialdehyde content, whereasNPK addition decreased chlorophyll a/b and SOD activity. The water × nutrient interaction factor had significant effects on leaf area, leaf thickness, chlorophyll a, proline and protein contents and SOD activity. Moreover, the leaf area and chlorophyll a content of S. glareosawere more sensitive to water and NPK addition, whereas thechlorophyll a/bwas more sensitive to water addition treatments. In conclusion, our results suggest that S. glareosacould adapt to fluctuations in water and nutrient availability by changing specific growth and physiological characteristics, which is important for revealingthe response mechanism of plantsin a desert steppe to climate changes.

Key words: nutrient addition, water addition, nitrogen, sensitivity, desert steppe

HU Ya,GUO Xinxin,YUE Ping,LI Xiangyun,ZHAO Shenglong,GUO Aixia,ZUO Xiao’an. Effects of water and nutrient addition on the growth and physiology of Stipa glareosa in a desert steppe in Inner Mongolia[J].Arid Zone Research, 2021, 38(2): 487-493.

Figures/Tables 4

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变量	水分	养分	水分×养分
面积	0.23	6.42^*	8.90^**
叶鲜重	12.68^**	0.13	1.82
叶干重	31.89^***	2.14	0.28
叶厚度	0.62	0.30	3.94^*
株高	10.27^**	0.47	2.47
叶绿素a(Ca)	0.06	0.44	5.60^*
叶绿素b(Cb)	0.28	1.43	0.88
类胡萝卜素(Cx)	0.25	0.75	2.13
叶绿素a/b(Ca/Cb)	2.70	3.59^*	0.22
脯氨酸	2.55	3.05	4.08^*
蛋白质	0.26	0.90	5.27^*
相对电导率(REC)	15.09^**	3.00	1.00
超氧化物歧化酶(SOD)	11.38^**	10.50^**	15.22^***
过氧化物酶(POD)	3.91	0.43	1.52
丙二醛(MDA)	0.09	5.850^**	0.210

Effects of water and nutrient addition on the growth and physiology of Stipa glareosa in a desert steppe in Inner Mongolia

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