Effects of water stress on life history strategy of Salsola nitraria in Zhundong， Xinjiang

doi:10.11686/cyxb2020224

Abstract

Abstract:

In arid areas， water is the key factor limiting plant growth. In this study， we determined the effects of water deficit on Salsola nitraria， the dominant species in the arid desert area of Zhundong， Xinjiang. The results of this field experiment will provide a reference for vegetation reconstruction in large open-pit mining areas in this region. The results showed that， at different growth stages， water deficit had a significant impact on biomass allocation in S. nitraria. The root∶shoot ratio increased with increasing severity of water deficit， and the aboveground biomass decreased faster than did the underground biomass. We used a membership function analysis of fuzzy mathematics to analyze the growth status of S. nitraria. The water content of S. nitraria differed significantly among different growth stages， and was highest at the seedling stage， followed by the growth stage， and then the reproductive stage. The water content of S. nitraria decreased with increasing severity of water deficit. The contents of carbon and nitrogen， but not phosphorus， in S. nitraria differed significantly among the seedling， vegetative growth， and reproductive stages. The nitrogen：phosphorus ratio was less than 14 at the seedling and vegetative growth stages but more than 16 at the reproductive stage. The results indicated that there is an energy trade-off favoring below-ground parts over above-ground parts at the seedling stage and vegetative growth stages. At the reproductive stage， the trade-off favors above-ground parts under low stress and below-ground parts under high stress. S. nitraria under drought stress has similar survival strategies at the seedling stage and growth stage. Under low stress， the survival strategy of S. nitraria at the reproductive stage is consistent with that at the seedling and growth stages， while under high stress， its survival strategy is different at the reproductive stage.

Key words: Salsola nitraria, water stress, biomass allocation, water content, energy trade-off

Lei PENG, Li ZHANG, Xiao-long ZHOU, Yan-bo WAN, Qing-dong SHI. Effects of water stress on life history strategy of Salsola nitraria in Zhundong， Xinjiang[J]. Acta Prataculturae Sinica, 2021, 30(5): 65-74.

Figures/Tables 8

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生长时期 Growth period	处理 Treatments	根冠比 Root to crown ratio （%, mean±SD）	根冠比胁迫指数 Root to crown ratio stress index
幼苗期 Seedling period	CK	8.78±1.04a	1.00
	T₁	7.89±1.92a	0.90
	T₂	8.38±1.95a	0.95
	T₃	8.70±2.46a	0.99
	T₄	8.98±0.60a	1.02
生长期 Growth period	CK	15.24±0.63b	1.00
	T₁	10.11±1.13c	0.66
	T₂	15.28±0.57b	1.00
	T₃	17.73±0.77a	1.16
	T₄	18.84±0.63a	1.24
繁殖期 Reproductive period	CK	9.75±1.10c	1.00
	T₁	7.29±0.57d	0.75
	T₂	11.71±0.80b	1.20
	T₃	14.35±0.88a	1.51
	T₄	15.82±1.03a	1.62

生长时期 Growth period	处理 Treatments	根冠比 Root to crown ratio （%, mean±SD）	根冠比胁迫指数 Root to crown ratio stress index
幼苗期 Seedling period	CK	8.78±1.04a	1.00
	T₁	7.89±1.92a	0.90
	T₂	8.38±1.95a	0.95
	T₃	8.70±2.46a	0.99
	T₄	8.98±0.60a	1.02
生长期 Growth period	CK	15.24±0.63b	1.00
	T₁	10.11±1.13c	0.66
	T₂	15.28±0.57b	1.00
	T₃	17.73±0.77a	1.16
	T₄	18.84±0.63a	1.24
繁殖期 Reproductive period	CK	9.75±1.10c	1.00
	T₁	7.29±0.57d	0.75
	T₂	11.71±0.80b	1.20
	T₃	14.35±0.88a	1.51
	T₄	15.82±1.03a	1.62

生长时期 Growth period	处理 Treatments	株高 Height （cm）	基径 Base diameter （mm）	冠幅 Crown （cm）	根长 Root length （cm）	地上生物量 Aboveground biomass （g）	地下生物量 Underground biomass （g）	隶属函数值 Average membership function value	评价 Evaluation
幼苗期 Seedling period	CK	0.503	0.243	0.440	0.517	0.450	0.600	0.459	2
	T₁	0.576	0.602	0.555	0.633	0.429	0.600	0.566	5
	T₂	0.584	0.485	0.615	0.614	0.540	0.300	0.523	3
	T₃	0.605	0.454	0.412	0.434	0.500	0.300	0.451	1
	T₄	0.624	0.630	0.500	0.448	0.433	0.600	0.539	4
生长期 Growth period	CK	0.470	0.390	0.403	0.540	0.461	0.333	0.433	1
	T₁	0.470	0.488	0.420	0.405	0.374	0.444	0.433	2
	T₂	0.490	0.581	0.629	0.589	0.565	0.467	0.553	5
	T₃	0.389	0.549	0.590	0.453	0.464	0.333	0.463	3
	T₄	0.370	0.467	0.600	0.506	0.478	0.600	0.504	4
繁殖期 Reproductive period	CK	0.494	0.617	0.508	0.511	0.662	0.532	0.554	5
	T₁	0.493	0.532	0.569	0.510	0.573	0.632	0.552	4
	T₂	0.508	0.465	0.517	0.540	0.633	0.444	0.518	3
	T₃	0.250	0.537	0.553	0.526	0.387	0.580	0.472	1
	T₄	0.500	0.639	0.403	0.531	0.400	0.444	0.486	2

生长时期 Growth period	处理 Treatments	株高 Height （cm）	基径 Base diameter （mm）	冠幅 Crown （cm）	根长 Root length （cm）	地上生物量 Aboveground biomass （g）	地下生物量 Underground biomass （g）	隶属函数值 Average membership function value	评价 Evaluation
幼苗期 Seedling period	CK	0.503	0.243	0.440	0.517	0.450	0.600	0.459	2
	T₁	0.576	0.602	0.555	0.633	0.429	0.600	0.566	5
	T₂	0.584	0.485	0.615	0.614	0.540	0.300	0.523	3
	T₃	0.605	0.454	0.412	0.434	0.500	0.300	0.451	1
	T₄	0.624	0.630	0.500	0.448	0.433	0.600	0.539	4
生长期 Growth period	CK	0.470	0.390	0.403	0.540	0.461	0.333	0.433	1
	T₁	0.470	0.488	0.420	0.405	0.374	0.444	0.433	2
	T₂	0.490	0.581	0.629	0.589	0.565	0.467	0.553	5
	T₃	0.389	0.549	0.590	0.453	0.464	0.333	0.463	3
	T₄	0.370	0.467	0.600	0.506	0.478	0.600	0.504	4
繁殖期 Reproductive period	CK	0.494	0.617	0.508	0.511	0.662	0.532	0.554	5
	T₁	0.493	0.532	0.569	0.510	0.573	0.632	0.552	4
	T₂	0.508	0.465	0.517	0.540	0.633	0.444	0.518	3
	T₃	0.250	0.537	0.553	0.526	0.387	0.580	0.472	1
	T₄	0.500	0.639	0.403	0.531	0.400	0.444	0.486	2

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