Vegetation responses to sand source and supply volume in Caragana microphylla shrubland

doi:10.11686/cyxb2022003

Abstract

Abstract:

This research targeted Caragana microphylla nebkhas located in three sites in residual-depositional land （endogenous sand source）， downwind of alluvial fans and cultivated land （exogenous sand source） in the eastern sector of the northern foot of Yinshan Mountain. Three sampling areas were set up along a transect at each sample site， and three sample quadrats were set up in each sample area， making a total of 27 sample quadrats across the three sample sites. The aim was to investigate the vegetation of C. microphylla nebkhas and inter-dunes， and to study the plant community characteristics of the C. microphylla shrubland under the different sand sources and sand supply volumes. It was found that： 1） C. microphylla-Leymus chinensis was a ubiquitous plant species association of C. microphylla nebkhas at all three study sites， despite the different soil depositional processes. 2） The species number within nebkhas was much greater than that of inter-dune areas in the three sites， and the species number was maximized in nebkhas located downwind of the alluvial fans with the most sand. Comparing the three sites， the species similarity was the highest between the downwind of the alluvial fans and cultivated land （38%-42%）. The similarity between the nebkhas and inter-dunes at each site was the highest in the residual-depositional land （80%） and lowest in the cultivated land （53%）. 3） Six plant species appeared in all three sites： Stipa krylovii， L. chinensis， Cleistogenes squarrosa， Artemisia frigida， Allium tenuissimum and Salsola ruthenica. 4） In downwind direction， as the increase （residual-depositional land） or decrease （downwind of alluvial fans and cultivated land） of sand supply volumes， the species number increased initially and then decreased on the inter-dune area， while within nebkhas， the numbers of species near the sand source were higher in the downwind of the alluvial fans and cultivated land than that in residual-depositional site， and were gradually close to that in the residual-depositional land with the decrease of sand supply volume. In conclusion， the sand supply volume and sand source greatly influenced species diversity of C. microphylla shrubland， while the major plant species association categories were almost unaffected.

Key words: Caragana microphylla, nebkhas, plant association, species diversity, sand supply

Ya-ling HU, Eerdun HASI, Liang MAN, Yi YANG, Ping ZHANG. Vegetation responses to sand source and supply volume in Caragana microphylla shrubland[J]. Acta Prataculturae Sinica, 2023, 32(1): 26-35.

Figures/Tables 6

References 40

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沙源类型 Type of sand source	群丛特征 Cluster characteristics	灌丛沙堆 Nebkhas	堆间地 Inter-dunes
坡积地 Residual-depositional land	类型Type	小叶锦鸡儿-羊草+蒺藜C. microphylla-L. chinensis+T. terrester	糙隐子草+羊草+并头黄芩C. squarrosa+L. chinensis+S. scordifolia
	盖度Coverage	50%~70%	15%~35%
	物种数Number of species	32 （36）	31 （36）
洪积扇 The alluvial fans	类型Type	小叶锦鸡儿-羊草+狗尾草C. microphylla-L. chinensis+S. viridis	羊草+克氏针茅+冷蒿L. chinensis+S. krylovii+A. frigida
	盖度Coverage	50%~70%	10%~50%
	物种数Number of species	50 （55）	37 （55）
农耕地 The cultivated land	类型Type	小叶锦鸡儿-羊草+糙隐子草 C. microphylla-L. chinensis+C. squarrosa	糙隐子草+羊草+冷蒿 C. squarrosa+L. chinensis+A. frigida
	盖度Coverage	50%~80%	20%~35%
	物种数Number of species	42 （47）	30 （47）

沙源类型 Type of sand source	群丛特征 Cluster characteristics	灌丛沙堆 Nebkhas	堆间地 Inter-dunes
坡积地 Residual-depositional land	类型Type	小叶锦鸡儿-羊草+蒺藜C. microphylla-L. chinensis+T. terrester	糙隐子草+羊草+并头黄芩C. squarrosa+L. chinensis+S. scordifolia
	盖度Coverage	50%~70%	15%~35%
	物种数Number of species	32 （36）	31 （36）
洪积扇 The alluvial fans	类型Type	小叶锦鸡儿-羊草+狗尾草C. microphylla-L. chinensis+S. viridis	羊草+克氏针茅+冷蒿L. chinensis+S. krylovii+A. frigida
	盖度Coverage	50%~70%	10%~50%
	物种数Number of species	50 （55）	37 （55）
农耕地 The cultivated land	类型Type	小叶锦鸡儿-羊草+糙隐子草 C. microphylla-L. chinensis+C. squarrosa	糙隐子草+羊草+冷蒿 C. squarrosa+L. chinensis+A. frigida
	盖度Coverage	50%~80%	20%~35%
	物种数Number of species	42 （47）	30 （47）

沙源类型 Sand source type	群落特征 Community characteristics	灌丛沙堆 Nebkhas			堆间地 Inter-dunes
沙源类型 Sand source type	群落特征 Community characteristics	L₁	L₂	L₃	L₁	L₂	L₃
坡积地 Residual -depositional land	植被盖度Vegetation cover	无显著差异No significant difference			15%~40%	10%~25%	10%~20%
	盖度最大Maximum coverage	蒺藜T. terrester	蒺藜T. terrester	蒺藜T. terrester	蒺藜T. terrester	蒺藜T. terrester	蒺藜T. terrester
	盖度其次Second in coverage	羊草，地锦L. chinensis， E. humifusa	羊草，地锦L. chinensis， E. humifusa	羊草，地锦L. chinensis， E. humifusa	并头黄芩，地锦，糙隐子草S. scordifolia， E. humifusa， C. squarrosa	并头黄芩，地锦S. scordifolia， E. humifusa	地锦，糙隐子草E. humifusa， C. squarrosa
洪积扇 The alluvial fans	植被盖度Vegetation cover	无显著差异No significant difference			10%~50%	10%~20%	15%~40%
	盖度最大Maximum coverage	羊草L. chinensis	羊草L. chinensis	羊草L. chinensis	羊草L. chinensis	冰草A. cristatum	冷蒿A. frigida
	盖度其次Second in coverage	狗尾草，黄囊薹草S. viridis， C. korshinskyi	狗尾草，虫实S. viridis， C. hyssopifolium	克氏针茅，刺沙蓬、糙隐子草S. krylovii， S. ruthenica， C. squarrosa	二裂委陵菜，黄囊薹草P. bifurca， C. korshinskyi	克氏针茅，刺沙蓬，栉叶蒿S. krylovii， S. ruthenica， N. pectinata	克氏针茅，刺沙蓬，糙隐子草S. krylovii， S. ruthenica， C. squarrosa
农耕地 The cultivated land	植被盖度Vegetation cover	无显著差异No significant difference			20%~30%	30%~40%	20%~25%
	盖度最大Maximum coverage	羊草L. chinensis	羊草L. chinensis	黄囊薹草C. korshinskyi	糙隐子草C. squarrosa	糙隐子草C. squarrosa	糙隐子草C. squarrosa
	盖度其次Second in coverage	糙隐子草，糙苏 C. squarrosa， P. umbrosa	糙隐子草 C. squarrosa	糙隐子草，糙苏C. squarrosa， P. umbrosa	羊草，克氏针茅，冷蒿L. chinensis， S. krylovii， A. frigida	羊草，克氏针茅，冷蒿L. chinensis， S. krylovii， A. frigida	羊草，黄囊薹草，冷蒿L. chinensis， C. korshinskyi， A. frigida

沙源类型 Sand source type	群落特征 Community characteristics	灌丛沙堆 Nebkhas			堆间地 Inter-dunes
沙源类型 Sand source type	群落特征 Community characteristics	L₁	L₂	L₃	L₁	L₂	L₃
坡积地 Residual -depositional land	植被盖度Vegetation cover	无显著差异No significant difference			15%~40%	10%~25%	10%~20%
	盖度最大Maximum coverage	蒺藜T. terrester	蒺藜T. terrester	蒺藜T. terrester	蒺藜T. terrester	蒺藜T. terrester	蒺藜T. terrester
	盖度其次Second in coverage	羊草，地锦L. chinensis， E. humifusa	羊草，地锦L. chinensis， E. humifusa	羊草，地锦L. chinensis， E. humifusa	并头黄芩，地锦，糙隐子草S. scordifolia， E. humifusa， C. squarrosa	并头黄芩，地锦S. scordifolia， E. humifusa	地锦，糙隐子草E. humifusa， C. squarrosa
洪积扇 The alluvial fans	植被盖度Vegetation cover	无显著差异No significant difference			10%~50%	10%~20%	15%~40%
	盖度最大Maximum coverage	羊草L. chinensis	羊草L. chinensis	羊草L. chinensis	羊草L. chinensis	冰草A. cristatum	冷蒿A. frigida
	盖度其次Second in coverage	狗尾草，黄囊薹草S. viridis， C. korshinskyi	狗尾草，虫实S. viridis， C. hyssopifolium	克氏针茅，刺沙蓬、糙隐子草S. krylovii， S. ruthenica， C. squarrosa	二裂委陵菜，黄囊薹草P. bifurca， C. korshinskyi	克氏针茅，刺沙蓬，栉叶蒿S. krylovii， S. ruthenica， N. pectinata	克氏针茅，刺沙蓬，糙隐子草S. krylovii， S. ruthenica， C. squarrosa
农耕地 The cultivated land	植被盖度Vegetation cover	无显著差异No significant difference			20%~30%	30%~40%	20%~25%
	盖度最大Maximum coverage	羊草L. chinensis	羊草L. chinensis	黄囊薹草C. korshinskyi	糙隐子草C. squarrosa	糙隐子草C. squarrosa	糙隐子草C. squarrosa
	盖度其次Second in coverage	糙隐子草，糙苏 C. squarrosa， P. umbrosa	糙隐子草 C. squarrosa	糙隐子草，糙苏C. squarrosa， P. umbrosa	羊草，克氏针茅，冷蒿L. chinensis， S. krylovii， A. frigida	羊草，克氏针茅，冷蒿L. chinensis， S. krylovii， A. frigida	羊草，黄囊薹草，冷蒿L. chinensis， C. korshinskyi， A. frigida

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