Spatial Distribution Pattern of Epilithic Moss Homomallium simlaense Patches in Rocky Desertification Habitats in Zhongliang Mountain, Chongqing, Southwest China

doi:10.11983/CBB16191

Abstract

Abstract: The present study used O-ring Point Pattern Analysis to analyze the spatial distribution patterns of three sizes of moss patches in the Karst area of Zhongliang Mountain, Chongqing, to understand the ecological characteristics and process of the common epilithic moss species Homomallium simlaense. Data were from 0.75 hm² sample plots in three rocky desertification habitats (potential, slight, and medium rocky desertification). The total number of H. simlaense patches was higher in slight rocky desertification plots, then potential rock desertification plots; medium rock desertification plots had lower patch number. In the three habitats, the changes in patch number were from small patches>medium patches>large patches. Small and medium patches were significantly clustered at small scales but randomly distributed at other scales; however, the large patches randomly distributed at all scales. We found a positive correlation between medium and small patches at small scales in the three habitats and no significant correlation between large and medium patches at most scales, except small scales in potential rocky desertification plots. Relative humidity was the most important environmental factor affecting the moss patch distribution, and the slope and number of rock fracture also played a significant role. Small and medium patches tended to aggregate with increasing moisture and shade stress. Moss patch size and its distribution pattern are good predictors of the ecological restoration in Karst rocky desertification areas.

Key words: rocky desertification habitat, patch size, spatial distribution pattern, stress gradient hypothesis

Chengqiang Dang, Huimin Huang, Rong Dong, Miao Chen, Ting Gao, Jianping Tao. Spatial Distribution Pattern of Epilithic Moss Homomallium simlaense Patches in Rocky Desertification Habitats in Zhongliang Mountain, Chongqing, Southwest China[J]. Chinese Bulletin of Botany, 2017, 52(5): 598-607.

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URL: https://www.chinbullbotany.com/EN/10.11983/CBB16191

https://www.chinbullbotany.com/EN/Y2017/V52/I5/598

Figures/Tables 7

Table 1 Survey of three types of rocky desertification habitat

Item	Plots
Item	Potential rocky desertification (A)	Slight rocky desertification (B)	Medium rocky desertification (C)
Elevation (m)	552	564	585
Slope (°)	26.3	22.1	31.5
Shade degree	0.55	0.35	0.10
Aspect	South	Southeast	Northeast
Geographical coordinates	29°41′40″N 106°24′47″E	29°41′53″N 106°24′30″E	29°41′57″N 106°24′20″E
Vegetation type	Broadleaved deciduous forest Shrub	Thick growth of grass Shrub	Thick growth of grass Shrub

Figure 1 The quantitative relation of Homomallium simlaense patches in 3 types of rocky desertification habitat A: Potential rocky desertification; B: Slight rocky desertification; C: Medium rocky desertification

Figure 2 Scatterplot of spatial distributions of Homomallium simlaense patches in 3 types of rocky desertification habitat(A) Potential rocky desertification; (B) Slight rocky desertification; (C) Medium rocky desertification

Figure 3 Spatial distribution pattern of Homomallium simlaense patches in 3 types of rocky desertification habitat(A1)-(A3) Potential rocky desertification; (B1)-(B3) Slight rocky desertification; (C1), (C2) Medium rocky desertification

Figure 4 Spatial associations of different patches of Homomallium simlaense in 3 types of rocky desertification habitat(A1)-(A3) Potential rocky desertification; (B1)-(B3) Slight rocky desertification; (C1) Medium rocky desertification

Table 2 Statistical characteristics of the first 4 axes of the principal component analysis in 3 types of rocky desertification habitat

Plots
Plots		1	2	3	4
Potential rocky desertification (A)	Eigenvalues	0.515	0.329	0.123	0.028
Potential rocky desertification (A)	Cumulative percentage variance of species data	51.5	84.4	96.6	99.4
Slight rocky desertification (B)	Eigenvalues	0.527	0.398	0.057	0.016
Slight rocky desertification (B)	Cumulative percentage variance of species data	52.7	92.5	98.2	99.8
Medium rocky desertification (C)	Eigenvalues	0.461	0.385	0.141	0.011
Medium rocky desertification (C)	Cumulative percentage variance of species data	46.1	84.7	98.7	99.8

Figure 5 Different patches of Homomallium simlaense rela- tionship with environmental factors in 3 types of rocky desertification habitat(A) Potential rocky desertification; (B) Slight rocky desertification; (C) Medium rocky desertification. 1, 2, 3……No. of patches. SFS: Rock fracture; SJ: Microhabitat (stone facing, cliff, stony gully, stone pit, and grotto); PD: Gradient; YBD: Crown density; XDSD: Relative humidity

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