Influence of edaphic factors on the spatial structure of inland halophytic communities: a case study in China

Journal of Vegetation Science - Tập 9 Số 6 - Trang 797-804 - 1998
Daiyuan Pan1,2, André Bouchard1,2, Pierre Legendre1, Gérald Domon3
1Département de sciences biologiques, Université de Montréal, C.P. 6128, succ. Centre-ville, Montréal, Québec H3C 3J7, Canada
2Institut de recherche en biologie végétale, Université de Montréal, 4101 rue Sherbrooke est, Montréal, Québec H1X 2B2, Canada
3École d'architecture de paysage, Université de Montréal, C.P. 6128, Succ. Centre-Ville, Montréal, Québec, H3C 3J7, Canada

Tóm tắt

Abstract. In order to understand the influence of edaphic factors on the spatial structure of inland halophytic plant communities, a 2.6 km2 study site, located on the lower fringe of the alluvial fan of the Hutubi River, in an arid region of China, was sampled and mapped. 105 patches were found to be homogeneous in species composition. Plant species and their coverage were recorded in each patch. 45 patches were randomly selected for the measurement of edaphic variables. A map with quadrat locations and boundaries of patches was digitized into a GIS and related to the vegetation and edaphic data matrices. CCA was used to evaluate the relative importance of edaphic factors in explaining the variation of the species assemblages and to identify the ecological preferences of species. The spatial structure of the communities and the main edaphic factors were analyzed using correlograms, Mantel correlograms and clustering under constraint of spatial contiguity.Gradient analysis showed that there are two distinct vegetation gradients in the study area, one of which is determined mainly by soil moisture (determined by depth to the water table), and the other by soil salinity (determined by electrical conductivity and hydrolytic alkalinity of the first soil layer). However, spatial analyses showed that at the sampling scale the halophytic communities in the study area are structured along one main spatial gradient determined by the water table level. Similar spatial autocorrelation structures between the factors related to the first soil layer and the communities, given our sampling scale, could not be detected. Our results suggest that the relative importance of the effects of different edaphic factors on the spatial structure of halophytic communities is scale‐dependent. The partitioning of species variation indicates that in addition to edaphic factors, other factors, such as biotic interactions, may play an important role in structuring these communities.

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Tài liệu tham khảo

Anon., 1978, The vegetation of Xinjiang and its utilization

10.1007/978-1-4612-3062-5_3

10.2307/2389731

10.2307/2423730

10.1007/BF00349995

10.1007/BF00714196

10.2307/1940179

10.1139/b91-098

Carnevale N.J., 1990, The relevance of physical factors on species distributions in inland salt marshes (Argentina), Coenoses, 5, 113

10.1016/B978-0-12-586450-3.50006-8

10.1086/285270

10.1086/415032

Johnson C.A., 1993, Environmental modelling with GIS, 276

10.1139/b91-310

Legendre L., 1983, Evolutionary biogeography of the marine algae of the North Atlantic, 9

10.1007/BF00048036

Legendre P., 1991, The R package: multidimensional analysis, spatial analysis

10.2307/1941447

10.2307/3237336

10.2307/1310176

10.2307/1939575

10.1086/284161

10.1007/978-94-009-8037-2

10.1007/978-3-642-80929-3_4

10.2307/1938672

10.1007/BF00038688

Braak C.J.F., 1987, CANOCO ‐ a FORTRAN program for canonical community ordination by [partial] [detrended] [canonical] correspondence analysis, principal component analysis and redundancy analysis (version 2.1)

10.1097/00010694-199509000-00007

10.1016/B978-0-12-586450-3.50010-X

10.2307/1937662

Waisel Y., 1972, Biology of halophytes

10.2307/2389612

Thông tin
Thông tin xuất bản

Journal of Vegetation Science

Tập 9 Số 6

797-804

Thông tin tác giả