ANALYSIS OF NICHE FITNESS OF ARTEMISIA HALONDENDRON POPULATION ON HORQIN SANDY LAND

doi:10.17521/cjpe.2006.0078

Abstract

Abstract:

Background and Aims Niche fitness of Artemisia halondendron population, that fixes shifting and semi-fixed sandy soils in Horqin sandy land, rarely has been explored. This study addresses 1) spatial and temporal differences in niche fitness and composite vigor and 2) limiting factors of niche fitness in different habitats.
Methods Mathematical models were adapted to calculate composite vigor index (CVI) and niche fitness values of a population of A. halondendron inhabiting shifting, semi-fixed, and fixed sandy lands. Data on CVI and niche fitness were collected by measuring height, size of canopy, branches, and biomass of individuals, as well as soil moisture content, nutrient content, and bulk density.
Key Results CVI was remarkably low on fixed sandy land, indicating that the ecological function of the population was weakened. Composite niche fitness values for different soils during the growing season ranked: semi-fixed > fixed > shifting sandy land. Moisture fitness values ranked: shifting > semi-fixed > fixed sandy land. As the soil moisture content changed, the limiting layer also changed. It was 15-30 cm in the different sandy lands in July, but with the infiltration of rain water, the layer deepened to 45-60 cm in August. In September, it was 30-45 cm in semi-fixed and fixed sandy lands, but remained 15-30 cm in shifting sandy land. The limiting factors in different habitats were different: soil organic matter content was limiting on shifting sandy land and soil moisture content was limiting on semi-fixed and fixed sandy lands.
Conclusions This study indicated that soil moisture content and nutrient content affected composite niche fitness. The relationship of soil moisture content and nutrient content directly influences composite niche fitness. Their ratio could reflect the importance of organic matter to fine roots, and the population could adapt to the ratio by adjusting the growth of fine roots.

Key words: Horqin sandy land, Artemisia halondendron population, Niche fitness

PIAO Shun-Ji, WANG Zhen-Jie, YAN Xiu-Ling, ZHANG Bin-Cai, YIN Hang. ANALYSIS OF NICHE FITNESS OF ARTEMISIA HALONDENDRON POPULATION ON HORQIN SANDY LAND[J]. Chin J Plant Ecol, 2006, 30(4): 593-600.

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https://www.plant-ecology.com/EN/Y2006/V30/I4/593

Figures/Tables 5

References 19

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	流动沙地 Shifting sandy land	半固定沙地 Semi-fixed sandy land	固定沙地 Fixed sandy land	p值 p value
密度 Dencity (m^-2)	1.11±0.20^AB	0.74±0.12^A	0.18±0.05^B	0.005
株高 Height (cm)	46.07±3.05^a	40.62±2.64^a	32.92±1.03^b	0.012
冠幅 Size of canopy (cm×cm)	(60.78±13.93)×(46.54±11.64)	(53.53±7.62)×(39.53±6.12)	(45.74±11.25)×(31.40±8.18)	0.560
单株枝条数 Branches of single body	97.80±8.01^A	87.50±22.08^A	26.50±2.46^B	0.004
单株地上生物量 Biomass of single body (g)	115.23±10.86^A	44.87±5.89^B	12.35±1.44^C	0.000
综合活力指数 Value of CVI	0.62±0.04^A	0.39±0.04^B	0.22±0.01^C	0.000
综合活力指数^* Value of CVI^*	0.57±0.05^A	0.35±0.09^B	0.22±0.04^C	0.000

	流动沙地 Shifting sandy land	半固定沙地 Semi-fixed sandy land	固定沙地 Fixed sandy land	p值 p value
密度 Dencity (m^-2)	1.11±0.20^AB	0.74±0.12^A	0.18±0.05^B	0.005
株高 Height (cm)	46.07±3.05^a	40.62±2.64^a	32.92±1.03^b	0.012
冠幅 Size of canopy (cm×cm)	(60.78±13.93)×(46.54±11.64)	(53.53±7.62)×(39.53±6.12)	(45.74±11.25)×(31.40±8.18)	0.560
单株枝条数 Branches of single body	97.80±8.01^A	87.50±22.08^A	26.50±2.46^B	0.004
单株地上生物量 Biomass of single body (g)	115.23±10.86^A	44.87±5.89^B	12.35±1.44^C	0.000
综合活力指数 Value of CVI	0.62±0.04^A	0.39±0.04^B	0.22±0.01^C	0.000
综合活力指数^* Value of CVI^*	0.57±0.05^A	0.35±0.09^B	0.22±0.04^C	0.000

月份 Month	样地类型 Sample land type	NF	x₁/x_a₁	x₂/x_a₂	x₃/x_a₃	x₄/x_a₄	x₅/x_a₅
7月 July	流动沙地 Shifting sandy land	0.831 5±0.013 9	0.954 7	0.548 8	1.284 1	0.548 1^*	1.103 1
	半固定沙地 Semi-fixed sandy land	0.875 6±0.014 5	0.715 9^*	1.429	1.606 8	0.822 7	0.961 7
	固定沙地 Fixed sandy land	0.845 4±0.007 7	0.402 1^*	4.971 9	1.353 9	1.695 8	0.613 5
	p值 p value	0.066
8月 Aug.	流动沙地 Shifting sandy land	0.875 8±0.022 3	1.061 2	1.123 6	1.039 1	0.565 5^*	1.060 9
	半固定沙地 Semi-fixed sandy land	0.899 7±0.012 4	0.695 1^*	2.514 8	1.637 1	1.083 8	0.777 5
	固定沙地 Fixed sandy land	0.874 9±0.009 1	0.541 1^*	3.696 1	1.511 3	1.466 7	0.677 8
	p值 p value	0.465
9月 Sept.	流动沙地 Shifting sandy land	0.865 1±0.003 3^A	0.637 2	1.887 2	1.355 1	0.574 8^*	1.113 4
	半固定沙地 Semi-fixed sandy land	0.840 9±0.006 1^B	0.486 4^*	2.030 3	1.739 5	0.564 5	1.057 2
	固定沙地 Fixed sandy land	0.853 5±0.012 8^AB	0.207 7^*	4.449 3	1.717 4	1.374 3	0.745 4
	p值 p value	0.006

月份 Month	样地类型 Sample land type	NF	x₁/x_a₁	x₂/x_a₂	x₃/x_a₃	x₄/x_a₄	x₅/x_a₅
7月 July	流动沙地 Shifting sandy land	0.831 5±0.013 9	0.954 7	0.548 8	1.284 1	0.548 1^*	1.103 1
	半固定沙地 Semi-fixed sandy land	0.875 6±0.014 5	0.715 9^*	1.429	1.606 8	0.822 7	0.961 7
	固定沙地 Fixed sandy land	0.845 4±0.007 7	0.402 1^*	4.971 9	1.353 9	1.695 8	0.613 5
	p值 p value	0.066
8月 Aug.	流动沙地 Shifting sandy land	0.875 8±0.022 3	1.061 2	1.123 6	1.039 1	0.565 5^*	1.060 9
	半固定沙地 Semi-fixed sandy land	0.899 7±0.012 4	0.695 1^*	2.514 8	1.637 1	1.083 8	0.777 5
	固定沙地 Fixed sandy land	0.874 9±0.009 1	0.541 1^*	3.696 1	1.511 3	1.466 7	0.677 8
	p值 p value	0.465
9月 Sept.	流动沙地 Shifting sandy land	0.865 1±0.003 3^A	0.637 2	1.887 2	1.355 1	0.574 8^*	1.113 4
	半固定沙地 Semi-fixed sandy land	0.840 9±0.006 1^B	0.486 4^*	2.030 3	1.739 5	0.564 5	1.057 2
	固定沙地 Fixed sandy land	0.853 5±0.012 8^AB	0.207 7^*	4.449 3	1.717 4	1.374 3	0.745 4
	p值 p value	0.006

月份 Month	样地类型 Sample land type	NF	0~15 cm	15~30 cm	30~45 cm	45~60 cm	60~75 cm	75~90 cm
7月 July	流动沙地 Shifting sandy land	0.821 0±0.035 0^a	1.272 6	0.729 5^*	0.775 4	0.781 2	0.813 6	0.785 3
	半固定沙地 Semi-fixed sandy land	0.686 1±0.061 7^ab	1.215 7	0.598 2^*	0.633 2	0.598 6	0.616 9	0.649 8
	固定沙地 Fixed sandy land	0.581 7±0.079 5^b	0.912 2	0.367 9^*	0.380 0	0.629 0	0.602 7	0.604 8
	p值 p value	0.046
8月 Aug.	流动沙地 Shifting sandy land	0.798 6±0.082 1	1.769 6	1.210 9	0.662 4	0.589 5^*	0.631 8	0.936 1
	半固定沙地 Semi-fixed sandy land	0.760 5±0.231 5	1.342 9	1.226 0	0.715 1	0.496 7^*	0.561 0	0.642 5
	固定沙地 Fixed sandy land	0.742 4±0.084 0	1.762 1	1.030 5	0.344 4	0.338 9^*	0.375 7	0.471 8
	p值 p value	0.964
9月 Sept.	流动沙地 Shifting sandy land	0.577 8±0.030 3^A	0.582 2	0.427 1^*	0.558 7	0.609 8	0.641 4	0.575 3
	半固定沙地 Semi-fixed sandy land	0.471 4±0.032 1^B	0.497 9	0.381 3	0.327 4^*	0.394 8	0.501 4	0.544 7
	固定沙地 Fixed sandy land	0.266 7±0.016 4^C	0.329 7	0.253 1	0.227 6^*	0.238 2	0.249 7	0.286 1
	p值 p value	0.000