DENSITY IN ARTEMISIA ORDOSICA SUCCESSIONAL COMMUNITY IN RESPONSE TO SPATIAL HETEROGENEITY OF SOIL MOISTURE AND ORGANIC MATTER

doi:10.17521/cjpe.2007.0142

Abstract

Abstract:

Aims Using environmental spatial heterogeneity to explain the heterogeneity of vegetation is an important issue in ecology. We approached relationships between the spatial heterogeneity of soil moisture, organic matter and densities of Artemisia ordosica and A. frigida in a successional community of A. ordosica. Our objective was to discuss stability mechanisms of the plant community based on changes in spatial heterogeneity.

Methods The study area is located at Tengri Desert (arid zone), which belongs to Alashan League of Inner Mongolia. Our sample plot was 80 m× 80 m, which contained 400 quadrats (4 m×4 m). In every quadrat, we determined soil moisture at 40 cm depth (oven-drying method) and soil organic matter at 0-5 cm top soil (potassium dichromate volumetric method), and recorded density ofA. ordosica and A. frigida. We analyzed densities in response to the spatial heterogeneity of soil moisture and organic matter using statistics and geostatistics.

Important findings The spatial heterogeneities of densities of A. ordosica and A. frigida were related to soil moisture and organic matter at the plot-scale (80 m×80 m). There were a significant positive linear correlation between the heterogeneities of the density ofA. frigida and moisture and a significant positive power cortelation between heterogeneties of the density of A. ordosica and soil organic matter. We suggest that A. ordosica enriched the content of organic matter, thus promoting establishment of A. frigida. Both A. frigida and A. ordosica had clumped distributions, which enhanced soil spatial heterogeneity. Findings indicate a competitive displacement relationship between the two species. Thus, changes of soil spatial heterogeneity are factors in A. ordosica community succession in semi-desert zone.

Key words: Artemisia ordosica, soil moisture, organic matter, spatial heterogeneity, succession of community

WANG Hai-Tao, HE Xing-Dong, GAO Yu-Bao, LU Jian-Guo, XUE Ping-Ping, MA Di. DENSITY IN ARTEMISIA ORDOSICA SUCCESSIONAL COMMUNITY IN RESPONSE TO SPATIAL HETEROGENEITY OF SOIL MOISTURE AND ORGANIC MATTER[J]. Chin J Plant Ecol, 2007, 31(6): 1145-1153.

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URL: https://www.plant-ecology.com/EN/10.17521/cjpe.2007.0142

https://www.plant-ecology.com/EN/Y2007/V31/I6/1145

Figures/Tables 6

References 33

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分布格局 Distribution pattern	样方数 Quadrat number	总个体数 Total individuals	样方平均个体数 Mean individuals	方差 Variance	χ²检验 Chi-Square test			分布系数法 Method of distribution coefficient
分布格局 Distribution pattern	样方数 Quadrat number	总个体数 Total individuals	样方平均个体数 Mean individuals	方差 Variance	χ²	p	格局 Pattern	C	格局 Pattern
油蒿 Artemisia ordosica	400	5 388	13.99	134.37	372.79	0.00	非随机分布 Non-random distribution	9.60	集群分布 Clumped distribution
冷蒿 A. frigida	400	6 387	17.79	229.13	413.39	0.00	非随机分布 Non-random distribution	12.88	集群分布 Clumped distribution

分布格局 Distribution pattern	样方数 Quadrat number	总个体数 Total individuals	样方平均个体数 Mean individuals	方差 Variance	χ²检验 Chi-Square test			分布系数法 Method of distribution coefficient
分布格局 Distribution pattern	样方数 Quadrat number	总个体数 Total individuals	样方平均个体数 Mean individuals	方差 Variance	χ²	p	格局 Pattern	C	格局 Pattern
油蒿 Artemisia ordosica	400	5 388	13.99	134.37	372.79	0.00	非随机分布 Non-random distribution	9.60	集群分布 Clumped distribution
冷蒿 A. frigida	400	6 387	17.79	229.13	413.39	0.00	非随机分布 Non-random distribution	12.88	集群分布 Clumped distribution

属性 Attributes	计数 No.	平均 Mean	最小值 Min	最大值 Max	标准差 SD	峰值 Kurt	偏斜度 Skew
土壤湿度 Soil moisture (%)	400	0.60	0.22	1.31	0.20	1.60	1.02
有机质 Soil organic matter (g·kg^-1)	400	2.12	0.73	5.38	0.72	1.48	1.03
油蒿密度 Density of Artemisia ordosica (ind.·m^-2)	400	0.84	0	3.56	0.72	1.42	1.34
冷蒿密度 Density of A. frigida (ind.·m^-2)	400	1.00	0	4.06	0.94	0.30	0.98

属性 Attributes	计数 No.	平均 Mean	最小值 Min	最大值 Max	标准差 SD	峰值 Kurt	偏斜度 Skew
土壤湿度 Soil moisture (%)	400	0.60	0.22	1.31	0.20	1.60	1.02
有机质 Soil organic matter (g·kg^-1)	400	2.12	0.73	5.38	0.72	1.48	1.03
油蒿密度 Density of Artemisia ordosica (ind.·m^-2)	400	0.84	0	3.56	0.72	1.42	1.34
冷蒿密度 Density of A. frigida (ind.·m^-2)	400	1.00	0	4.06	0.94	0.30	0.98

参数 Parameters	自变量x Independent variable	因变量y Dependant variable	回归方程 Regression equation	R²
D	SM	DAF	y=190.5x³-1 062.3x²+1 971.4x-1 215.9	0.729 4
D	SM	DAO	y=-134.56x³+763.56x²-1 442.4x+908.88	0.590 7
PH	SM	DAO	y=-78.621x³+185.05x²-144.09x+38.038	0.556 2
ER	SM	DAO	y=0.040 4x³-2.142x²+33.413x-119.38	0.622 6
D	DAO	SOM	y=11.424x³-62.344x²+113.07x-66.201	0.515 2
ER	DAO	SOM	y=-0.539 3x²+36.809x-466.45	0.727 4
ER	DAF	SOM	y=0.137 7x²-6.339 3x+65.351	0.747 9
ER	TDOF	SOM	y=-0.043 3x³+2.829 7x²-49.431x+242.39	0.550 5