Effects of sand-buried on annual herbaceous plants in desert-oasis ecotone of Hexi Corridor Gansu， China

doi:10.7522/j.issn.1000-694X.2021.00009

Journal of Desert Research ›› 2021, Vol. 41 ›› Issue (3): 185-194.DOI: 10.7522/j.issn.1000-694X.2021.00009

Effects of sand-buried on annual herbaceous plants in desert-oasis ecotone of Hexi Corridor Gansu， China

Bing Song¹(), Guohua Wang¹^,²(), Qianqian Gou¹^,², Lulu Xi¹

^1.College of Geographical Sciences，Shanxi Normal University，Linfen 041000，Shanxi，China
^2.Linze Inland River Basin Research Station，Northwest Institute of Eco-Environment and Resources，Chinese Academy of Sciences，Lanzhou 730000，China

Received:2020-09-09 Revised:2021-01-29 Online:2021-05-26 Published:2021-05-26
Contact: Guohua Wang

Abstract

Abstract:

Annual herbaceous plants are the dominant plant groups in the herb layer of the artificial sand-fixing plant community in the desert-oasis ecotones. In order to assess the impact of the depth of sand burial on the emergence， growth and reproduction of annual herbaceous plants， the typical annual herbaceous plants Setaria viridis， Chloris virgata， Halogeton arachnoideus and Bassia dasyphylla were selected in a typical desert oasis ecotone of Hexi Corridor as the research object， through 7 sand burial depth experiments of 0 （CK）， 1， 2， 3， 5， 10 cm and 15 cm， aiming to explored the impact mechanism of sand burial on annual herb. The research results showed that：（1） Four kinds of annual herb plants had the highest emergence rate at a depth of 0-1 cm， the maximum emergence depth of S. viridis was 10 cm， C. virgata and B. dasyphylla 5 cm， and H. arachnoideus 3 cm；（2） Under different sand depths， the growth （plant height and total biomass） and reproduction （number of seeds and 100-seed weight） of the four annual herbaceous plants were high in 2-3 cm. After 3 cm， the survival rate of Chloris virgata and B. dasyphylla significantly decreased， and S. viridis still maintained a high survival rate. （3） Under different sand burial depths， the content of osmotic adjustment substances （soluble sugar， soluble protein and free proline） of four annual herbaceous plants reached the highest at 2-3 cm， and malondialdehyde （MDA）） the high content was mainly located at the depth of 3-5 cm， the chlorophyll content was the highest at 1-2 cm， and then started to decreased after 2 cm；（4） Correlation analysis showed that the growth and survival of annual herb plants are extremely significantly correlated with free proline and chlorophyll content The relationship showed that the two played a more critical role in maintaining plant leaf water balance， ensuring photosynthesis， and maintaining normal plant growth. The research can provide a scientific basis for the restoration of annual herbaceous plants in the desert-oasis ecotones.

Key words: desert-oasis ecotones, annual herbaceous plants, sand burial threshold, physiological characteristics, growth and survival

CLC Number:

Q948.11

Bing Song, Guohua Wang, Qianqian Gou, Lulu Xi. Effects of sand-buried on annual herbaceous plants in desert-oasis ecotone of Hexi Corridor Gansu， China[J]. Journal of Desert Research, 2021, 41(3): 185-194.

Figures/Tables 7

Fig.1 Seed photos of four annual herbs

Fig.2 The seedling emergence rate, plant height, total biomass and survival rate of four annual herbaceous plants (Setaria viridis, Chloris virgata, Halogeton arachnoideus, Bassia dasyphyll) under different sand-buried depths (Different letters indicate the same plant has significant differences in different sand burial depths. N represents no seedling)

Table 1 Propagation quality (the weight of 100 diaspore) and quantity (seed production) of four annual herbaceous plants under different sand burial depths

科	种	沙埋深度/cm	百粒重/mg	每株结种量/粒
禾本科 (Gramineae)	狗尾草 (Setaria viridis)	0	20.0±5.4^a	38.7±10.4^a
		1	26.9±5.3^a	75.8±23.1^ab
		2	22.6±7.9^a	109.7±32.9^b
		3	41.9±10.5^b	115.6±33.4^b
		5	24.7±2.4^a	108.9±21.3^b
		10	19.6±6.8^a	105.8±36.6^b
	虎尾草 (Chloris virgate)	0	12.0±3.1^a	170.8±44.4^b
		1	30.9±7.0^bc	214.2±48.7^b
		2	27.2±9.3^bc	410.8±54.1^c
		3	36.5±5.7^c	366.2±57.7^c
		5	20.0±3.5^ab	32.0±5.5^a
藜科 (Chenopodiaceae)	白茎盐生草 (Halogeton arachnoideus)	0	—	—
		1	—	—
		2	—	—
		3	—	—
	雾冰藜 (Bassia dasyphylla)	0	42.9±14.6^ab	11.7±4.7^a
		1	67.4±13.1^b	56.6±19.4^b
		2	71.5±21.8^b	174.2±37.4^c
		3	63.7±17.6^ab	69.8±20.2^b
		5	35.2±6.1^a	66.0±11.4^b

Fig.3 Changes of soluble sugar, soluble protein and free proline in the leaves of four annual herbaceous plants (Setaria viridis, Chloris virgata, Halogeton arachnoideus, Bassia dasyphyll) at different sand-burial depths（Different letters indicate the same plant has significant differences in different sand burial depths. N represents no seedling）

Fig.4 Changes of malondialdehyde (MDA) content in the leaves of four annual herbaceous plants (Setaria viridis, Chloris virgata, Halogeton arachnoideus, Bassia dasyphyll) at different sand-burying depths（Different letters indicate the same plant has significant differences in different sand burial depths. N represents no seedling）

Fig.5 Changes of chlorophyll content in leaves of four annual herbaceous plants (Setaria viridis, Chloris virgata, Halogeton arachnoideus, Bassia dasyphyll) at different sand-burying depths（Different letters indicate the same plant has significant differences in different sand burialdepths. N represents no seedling）

Table 2 Correlation analysis of growth and physiological indexes of four annual herbs.

植物种	指标	渗透调节物质			丙二醛	叶绿素
植物种	指标	可溶性糖	可溶性蛋白	游离脯氨酸	丙二醛	叶绿素
狗尾草	株高	0.310	-0.237	0.0449	0.455	-0.220
	总生物量	0.554^*	-0.226	0.303	0.339	0.377
	存活率	-0.393	-0.391	-0.491	-0.526	-0.653^**
虎尾草	株高	0.377	0.443	-0.041	-0.067	0.175
	总生物量	0.352	0.728^**	-0.716^**	-0.351	0.271
	存活率	0.283	0.245	-0.897^**	-0.405	0.745^**
白茎盐生草	株高	0.297	0.336	0.605^*	-0.614^*	0.399
	总生物量	-0.007	0.383	-0.299	0.359	0.049
	存活率	0.375	0.177	0.725^**	-0.189	0.156
雾冰藜	株高	0.283	-0.051	0.343	-0.514^*	0.134
	总生物量	0.154	-0.225	0.270	0.111	-0.048
	存活率	0.324	0.082	0.188	-0.761^**	0.668^**

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Effects of sand-buried on annual herbaceous plants in desert-oasis ecotone of Hexi Corridor Gansu， China

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