Responses of seedling growth and biomass allocation of Artemisia ordosica to precipitation and precipitation interval

doi:10.7522/j.issn.1000-694X.2021.00061

Journal of Desert Research ›› 2021, Vol. 41 ›› Issue (5): 183-191.DOI: 10.7522/j.issn.1000-694X.2021.00061

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Responses of seedling growth and biomass allocation of Artemisia ordosica to precipitation and precipitation interval

Yingying He¹(), Minghan Yu¹(), Guodong Ding¹, Guanglei Gao¹, Wei Liu², Ziyuan Zhou¹

^1.Key Laboratory of State Forestry Administration on Soil and Water Conservation / MOE Engineering Research Center of Forestry Ecological Engineering / Yanchi Ecology Research Station of the Mu Us Desert，Beijing Forestry University，Beijing 100083，China
^2.Shanxi Road and Bridge Construction Group Co. ，Ltd. ，Taiyuan 030006，China

Received:2021-04-05 Revised:2021-04-27 Online:2021-09-20 Published:2021-09-23
Contact: Minghan Yu

Abstract

Abstract:

Under the background of global climate change， the precipitation pattern in semi-arid areas in northern China will show the trend of increasing precipitation time fluctuation and extreme precipitation events， which will inevitably have a direct impact on the desert vegetation ecosystem. Artemisia ordosica is an important constructive species in semi-arid desert ecosystems. To study the response characteristics of its growth and biomass allocation under different rainfall patterns can provide a theoretical basis for exploring the adaptation mechanisms of desert plants in the context of global climate change. In this study， using artificial rain control methods， setting up a two-factor cross-experimental design of precipitation （increased by 30%， decreased by 30%， natural precipitation） and precipitation interval （5， 10， 15 d） to monitor the growth and development of A. ordosica response of growth and development morphological parameters and aboveground biomass and underground biomass distribution to the change of precipitation patterns. The results showed that：（1） the change of precipitation has a significant effect on plant height of A. ordosica （P<0.05）， and a 30% reduction in precipitation can significantly reduce the plant height of A. ordosica. Under the condition of consistent precipitation intervals， a 30% increase in precipitation can significantly promote the increase of aboveground biomass. （2） the precipitation interval had a significant impact on the plant height and crown width of Artemisia ordosica （P<0.05）， and the rain interval was extended from 5 d to 15 d. Plant height and crown width of A. ordosica were inhibited. When the total precipitation was fixed， the aboveground and underground biomass and total biomass of A. ordosica were significantly increased with the extension of precipitation interval （15 d）. （3） precipitation and precipitation interval have interactive effects on the root-shoot ratio of A. ordosica， the effect of total precipitation on the root-shoot ratio depends on the length of precipitation interval. Changing the biomass allocation pattern is an important strategy for A. ordosica to adapt to changing of water resources environment. Under the trend of changing rainfall pattern in the future， the dual effects of precipitation and precipitation interval should be paid more attention to in the vegetation construction and management of desert ecosystems.

Key words: precipitation, precipitation interval, biomass, root/shoot ratio

CLC Number:

Q948.15

Yingying He, Minghan Yu, Guodong Ding, Guanglei Gao, Wei Liu, Ziyuan Zhou. Responses of seedling growth and biomass allocation of Artemisia ordosica to precipitation and precipitation interval[J]. Journal of Desert Research, 2021, 41(5): 183-191.

Figures/Tables 6

Table 1 Total precipitation and precipitation interval setting in experiment

处理时间	月平均降雨量/mm	降雨间隔	平均每次降雨量/mm			月降雨频次
处理时间	月平均降雨量/mm	降雨间隔	W-	W	W+	月降雨频次
7月	69.75	T	8.14	11.63	15.11	6
		T+	16.2	23.25	30.23	3
		T++	24.41	34.88	45.34	2
8月	63.33	T	7.39	10.56	13.72	6
		T+	14.70	21.11	27.44	3
		T++	22.17	31.67	41.18	2
9月	52.76	T	6.16	8.79	11.43	6
		T+	12.30	17.59	22.86	3
		T++	18.40	26.38	34.29	2

Fig.1 Dynamics of tree height and crown of Artemisia ordosica seedlings in different precipitation patterns （Mean±SE）

Table 2 Results（F-values）based on Two-way ANOVA of the effects of precipitation and precipitation interval on tree height and crown of Artemisia ordosica seedlings

变量	株高	冠幅
W	26.532^***	0.028
T	8.191^**	76.380^***
W×T	0.625	2.791

Fig.2 Dynamics of leaf biomass，stem biomass，aboveground biomass， underground biomass， total biomass of Artemisia ordosica seedlings in different precipitation patterns （Mean±SE）

Fig.3 Dynamics of root/shoot ratio of Artemisia ordosica seedlings in different precipitation patterns （mean±SE）

Table 3 Results（F-values）based on Two-way ANOVA of the effects of precipitation and precipitation interval on aboveground biomass，belowground biomass and root/shoot ratio of Artemisia ordosica seedlings

变量	地上生物量	地下生物量	总生物量	根冠比
W	39.199^***	13.780^***	17.772^***	36.496^***
T	60.052^***	49.249^***	61.273^***	23.001^***
W×T	3.860^**	3.319^**	0.775	13.186^***

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Responses of seedling growth and biomass allocation of Artemisia ordosica to precipitation and precipitation interval

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