Response of structure of plant community to extreme drought in fixed dunes and grassland in the Horqin Sandy Land

doi:10.7522/j.issn.1000-694X.2020.00065

Journal of Desert Research ›› 2021, Vol. 41 ›› Issue (1): 129-136.DOI: 10.7522/j.issn.1000-694X.2020.00065

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Response of structure of plant community to extreme drought in fixed dunes and grassland in the Horqin Sandy Land

Yimei Sun¹(), Qing Tian¹(), Peng Lv²^,³, Aixia Guo³, Pingping Li¹, Liqin Zhu¹, Xiaoan Zuo²

^1.College of Forestry，Gansu Agricultural University，Lanzhou 730070，China
^2.Naiman Desertification Research Station，Northwest Institute of Eco-Environment and Resources，Chinese Academy of Sciences，Lanzhou 730000，China
^3.University of Chinese Academy of Sciences，Beijing 100049，China

Received:2020-03-09 Revised:2020-07-07 Online:2021-01-29 Published:2021-01-29
Contact: Qing Tian

Abstract

Abstract:

In order to investigate the response of structure of plant community to extreme drought in different habitats in sandy land， the effects of extreme drought （rain reduction 60% and 60 days drought in growing season） on vegetation community characteristics and leaf traits in sandy grassland and fixed dunes were studied. The results showed that：（1） Habitat change has a significant impact on the above-ground biomass and leaf dry matter content （LDMC） of plant communities （P<0.05）. Above-ground biomass and LDMC in grasslands are significantly higher than in fixed dunes， while species numbers， vegetation coverage， height and specific leaf area （SLA） no significant difference between the two habitats （P>0.05）；（2） Extreme drought treatment significantly affected plant community coverage， above-ground biomass， and LDMC （P<0.05）， 60% rainfall reduction significantly reduced plant community coverage and above-ground biomass， and 60 days of drought significantly reduced plant community coverage， above-ground biomass， height and LDMC； there were no significant differences in vegetation characteristics and traits between 60% rainfall reduction and 60 days drought treatment （P>0.05）；（3） 60% rainfall reduction and 60 days of drought significantly reduced the vegetation coverage and above-ground biomass of grassland and fixed dunes， and 60 days of drought also reduced the plant height and LDMC of fixed dunes （P<0.05）；（4） Correlation analysis showed that above-ground biomass of sandy plant communities was significantly positively correlated with coverage， height， and LDMC （P<0.05）. Vegetation in different habitats of sandy land adapts to extreme drought through changes in plant community composition， dominant species and their leaf dry matter content.

Key words: extreme drought, habitat types, vegetation characteristics, leaf traits

CLC Number:

Q948.15

Yimei Sun, Qing Tian, Peng Lv, Aixia Guo, Pingping Li, Liqin Zhu, Xiaoan Zuo. Response of structure of plant community to extreme drought in fixed dunes and grassland in the Horqin Sandy Land[J]. Journal of Desert Research, 2021, 41(1): 129-136.

Figures/Tables 5

References 40

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物种	重要值/%
	沙质草地			固定沙丘
	CK	减雨60%	干旱60 d	CK	减雨60%	干旱60 d
白草(Pennisetum centrasiaticum)	10.20±0.64	7.75±3.22	2.92±0.97	5.42	4.82
糙隐子草(Cleistogenes squarrosa)	25.78±1.65	14.72±4.31	17.26±3.88	15.08±3.74	15.17±1.29	16.09±4.47
大果虫实(Corispermum macrocarpum)		5.43	11.48	3.59±1.26
达乌里胡枝子(Lespedeza davurica)	14.13±3.02	10.38±2.55	15.88±4.31		1.13±0.02	16.27
地锦(Euphorbia humifusa)				1.81±0.21	0.43±0.07
地稍瓜(Cynanchum thesioides)	6.00	4.05	3.17±0.53	13.43
防风(Saposhnikovis divaricate)				5.63	3.39±0.20	7.14±0.54
锋芒草(Tragus racemosus)	9.60			2.64±1.45	6.08±1.89	2.18±0.84
狗尾草(Setaria viridis)	8.87±3.22	10.09±2.39	4.04±1.13	8.05±2.18	2.27±0.85	4.75±2.19
虎尾草(Chloris virgate)			0.92	7.17		5.41±3.16
画眉(Eragrostis pilosa)	2.90		2.49±1.22	7.88±2.61	2.19	2.77±0.59
黄蒿(Artemisia scoparia)	19.85±2.43	26.02±6.75	26.65±5.44	16.65±3.51	22.92±3.97	22.44±4.26
蒺藜(Tribulus terrester)	3.50	4.63±1.68	6.21±1.51	1.31±0.13	8.84±2.26	11.49±5.70
尖头叶藜(Chenopodium acuminatum)	3.95±0.05	5.85±1.86	2.97±1.52	11.51±4.50	25.52±4.49	25.84±12.23
麻黄(Ephedra sinica)				6.15	8.86	17.99±5.82
马齿苋(Portulaca oleracea)				2.86	0.84±0.30	0.82
沙葱(Allium mongolicum)				6.39±3.23	8.77±2.20	7.77±2.44
砂蓝刺头(Echinops gmelini)	23.18±2.78	20.56±2.76	26.14±3.12	20.95±3.74	14.53±5.33	30.67±4.20
牻牛儿苗(Erodium stephanianum)	7.00±2.19	14.64±3.37	10.06±4.07	9.14
五星蒿(Bassia dasyphylla)	1.30	6.65	3.04±2.46	4.94±0.77	3.46
猪毛菜(Salsola collina)	3.70±1.12	11.15±4.98	5.03±2.84	5.18±2.32	4.35±1.10	4.04
总物种数	14	14	16	20	18	15

物种	重要值/%
	沙质草地			固定沙丘
	CK	减雨60%	干旱60 d	CK	减雨60%	干旱60 d
白草(Pennisetum centrasiaticum)	10.20±0.64	7.75±3.22	2.92±0.97	5.42	4.82
糙隐子草(Cleistogenes squarrosa)	25.78±1.65	14.72±4.31	17.26±3.88	15.08±3.74	15.17±1.29	16.09±4.47
大果虫实(Corispermum macrocarpum)		5.43	11.48	3.59±1.26
达乌里胡枝子(Lespedeza davurica)	14.13±3.02	10.38±2.55	15.88±4.31		1.13±0.02	16.27
地锦(Euphorbia humifusa)				1.81±0.21	0.43±0.07
地稍瓜(Cynanchum thesioides)	6.00	4.05	3.17±0.53	13.43
防风(Saposhnikovis divaricate)				5.63	3.39±0.20	7.14±0.54
锋芒草(Tragus racemosus)	9.60			2.64±1.45	6.08±1.89	2.18±0.84
狗尾草(Setaria viridis)	8.87±3.22	10.09±2.39	4.04±1.13	8.05±2.18	2.27±0.85	4.75±2.19
虎尾草(Chloris virgate)			0.92	7.17		5.41±3.16
画眉(Eragrostis pilosa)	2.90		2.49±1.22	7.88±2.61	2.19	2.77±0.59
黄蒿(Artemisia scoparia)	19.85±2.43	26.02±6.75	26.65±5.44	16.65±3.51	22.92±3.97	22.44±4.26
蒺藜(Tribulus terrester)	3.50	4.63±1.68	6.21±1.51	1.31±0.13	8.84±2.26	11.49±5.70
尖头叶藜(Chenopodium acuminatum)	3.95±0.05	5.85±1.86	2.97±1.52	11.51±4.50	25.52±4.49	25.84±12.23
麻黄(Ephedra sinica)				6.15	8.86	17.99±5.82
马齿苋(Portulaca oleracea)				2.86	0.84±0.30	0.82
沙葱(Allium mongolicum)				6.39±3.23	8.77±2.20	7.77±2.44
砂蓝刺头(Echinops gmelini)	23.18±2.78	20.56±2.76	26.14±3.12	20.95±3.74	14.53±5.33	30.67±4.20
牻牛儿苗(Erodium stephanianum)	7.00±2.19	14.64±3.37	10.06±4.07	9.14
五星蒿(Bassia dasyphylla)	1.30	6.65	3.04±2.46	4.94±0.77	3.46
猪毛菜(Salsola collina)	3.70±1.12	11.15±4.98	5.03±2.84	5.18±2.32	4.35±1.10	4.04
总物种数	14	14	16	20	18	15

处理	物种数	盖度	地上生物量	高度	比叶面积	叶干物质含量
生境	0.043	1.335	5.455^*	2.239	0.125	24.332^***
极端干旱	0.639	29.854^***	21.056^***	2.607	0.168	4.914^*
生境×极端干旱	0.447	2.603	2.240	0.605	3.986^*	0.084

处理	物种数	盖度	地上生物量	高度	比叶面积	叶干物质含量
生境	0.043	1.335	5.455^*	2.239	0.125	24.332^***
极端干旱	0.639	29.854^***	21.056^***	2.607	0.168	4.914^*
生境×极端干旱	0.447	2.603	2.240	0.605	3.986^*	0.084

	物种数	盖度	地上生物量	高度	比叶面积
盖度	0.46^**
地上生物量	0.08	0.56^**
高度	-0.29	0.21	0.34^*
比叶面积	-0.29	-0.14	0.18	0.01
叶干物质含量	0.21	0.48^**	0.40^*	-0.08	-0.02

Response of structure of plant community to extreme drought in fixed dunes and grassland in the Horqin Sandy Land

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