Spatial pattern of Psammochloa villosa population in patch landscape in dune habitat

doi:10.7522/j.issn.1000-694X.2021.00206

Journal of Desert Research ›› 2022, Vol. 42 ›› Issue (4): 89-98.DOI: 10.7522/j.issn.1000-694X.2021.00206

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Spatial pattern of Psammochloa villosa population in patch landscape in dune habitat

Heng Ren¹^,²(), Wenzhi Zhao¹, Zhitao Wang³, Jiang Zhao⁴

^1.Linze Inland River Basin Research Station，Institute of Eco-Environment and Resources，Chinese Academy of Sciences，Lanzhou 730000，China
^2.University of Chinese Academy of Sciences，Beijing 100049，China
^3.College of Geography and Environment Science，Northwest Normal University，Lanzhou 730070，China
^4.Jianshan Primary School of Wenxian County，Wenxian 746400，Gansu，China

Received:2021-10-09 Revised:2021-11-26 Online:2022-07-20 Published:2022-08-29

Abstract

Abstract:

The spatial distribution pattern of populations is the result of the interaction between the biological characteristics of plant populations and environmental factors， which has always been a hot spot of ecological research. Using the methods of community investigation and point pattern analysis， the spatial distribution patterns of Psammochloa villosa populations in patch landscape under different dune habitats were studied. The result shows：（1）Populations of P. villosa have a pattern of aggregation in different sand dune habitats， and the aggregation scale decreases first and then increases. （2） Populations of P. villosa in the semi-fixed dunes deviates from the poisson agglomeration model at the scale of 2-37 cm positively， and deviates from the Poisson agglomeration model at the scale of 95-168 cm negatively. （3）Populations of P.villosa in mobile dunes and fixed dunes are accordance with the nested double-cluster process， in semi-mobile dunes deviate from the nested dual-cluster model at the scale of 0-50 cm negatively， in semi-fixed dunes deviate from the nested double-cluster process at the scale of 0-3 cm， 98-105 cm， 110-123 cm and 130-168 cm scales negatively. Studies have shown that patchy distribution and intraspecific and interspecific competition are the key to the transformation of the spatial distribution pattern of P. villosa populations. Ensuring the high concentration of individuals within the patch and sacrificing the individuals outside the patch is one of the ecological adaptation strategies in the spatial layout and the resources occupancy of the P. villosa population.

Key words: Psammochloa villosa, spatial distribution pattern, sand dune habitat, reproduction strategy, Badain Jaran Desert

CLC Number:

Q948

Heng Ren, Wenzhi Zhao, Zhitao Wang, Jiang Zhao. Spatial pattern of Psammochloa villosa population in patch landscape in dune habitat[J]. Journal of Desert Research, 2022, 42(4): 89-98.

Figures/Tables 6

References 37

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沙丘类型	植被指征		群落特征		地表覆土或结皮情况
沙丘类型	植被盖度/%	植被和流沙特征	优势种	主要伴生种	地表覆土或结皮情况
流动沙丘(A)	0—10	零星分布沙鞭小斑块，沙鞭地上分株较少，地表基本上被流沙覆盖	沙鞭	—	沙丘上无结皮或只有物理性结皮
半流动沙丘(B)	10—30	有多个沙鞭小斑块，出现沙米等一年生草本植物，流沙面积大于70%	沙鞭	沙米、虫实	沙丘上有10%—30%的生物结皮和较多的物理结皮
半固定沙丘(C)	30—60	出现沙蒿等多年生草本，群落由沙鞭与沙蒿等物种构成，流沙面积大于20%	沙鞭	沙蒿、沙米、虫实	沙丘30%—80%被生物结皮覆盖
固定沙丘(D)	60—100	出现泡泡刺、霸王等灌木，沙鞭与泡泡刺、霸王、沙蒿、沙米等多物种形成较稳定群落结构，流沙面积低于20%	沙鞭	泡泡刺、霸王、沙蒿、沙米	沙丘80%以上被生物结皮覆盖

沙丘类型	植被指征		群落特征		地表覆土或结皮情况
沙丘类型	植被盖度/%	植被和流沙特征	优势种	主要伴生种	地表覆土或结皮情况
流动沙丘(A)	0—10	零星分布沙鞭小斑块，沙鞭地上分株较少，地表基本上被流沙覆盖	沙鞭	—	沙丘上无结皮或只有物理性结皮
半流动沙丘(B)	10—30	有多个沙鞭小斑块，出现沙米等一年生草本植物，流沙面积大于70%	沙鞭	沙米、虫实	沙丘上有10%—30%的生物结皮和较多的物理结皮
半固定沙丘(C)	30—60	出现沙蒿等多年生草本，群落由沙鞭与沙蒿等物种构成，流沙面积大于20%	沙鞭	沙蒿、沙米、虫实	沙丘30%—80%被生物结皮覆盖
固定沙丘(D)	60—100	出现泡泡刺、霸王等灌木，沙鞭与泡泡刺、霸王、沙蒿、沙米等多物种形成较稳定群落结构，流沙面积低于20%	沙鞭	泡泡刺、霸王、沙蒿、沙米	沙丘80%以上被生物结皮覆盖

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Spatial pattern of Psammochloa villosa population in patch landscape in dune habitat

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