Dominance of different plant life forms in the typical steppe evidenced from impacts of environmental factors on chlorophyll

doi:10.17521/cjpe.2021.0267

Abstract

Abstract:

Aims This study aimed to understand whether the coupling between environmental factors and chlorophyll contents is related to the dominance of plant life forms in the grasslands.

Methods In July 2020, we measured chlorophyll contents in 185 plant samples from 50 forage species of 11 sampling plots of a typical steppe in Xilinhot. Through correlation analysis, single factor analysis of variance, redundancy analysis (RDA), stepwise regression analysis and path analysis, we analyzed the effects of multiple environmental factors on indices of plant chlorophyll and the mechanism underlying the competition advantage of different plant species.

Important findings 1) The contents of chlorophyll a and chlorophyll b were significantly positively correlated with that of total chlorophyll, with the correlation coefficients of 0.807 and 0.936, respectively. The contents of total chlorophyll were more affected by that of chlorophyll b. 2) The contents of chlorophyll a, chlorophyll b, and total chlorophyll of the four life forms followed an order of semi-shrubs > perennial grasses > annual or biennial plants > perennial forbs. 3) The variations of chlorophyll contents among plant life forms were differently explained by environmental factors. The RDA results showed that the explanatory degree of semi-shrubs was the highest (28.0%), followed by annual or biennial plants (18.3%) and perennial forbs (17.7%), and that of perennial grasses was the lowest (12.7%). 4) The chlorophyll index of plant life forms were affected by various environmental factors. The chlorophyll b contents in semi-shrubs were affected by soil organic carbon content and relative air humidity, while their total chlorophyll contents were mainly influenced by relative air humidity. Chlorophyll b contents of perennial forbs were mainly restricted by surface temperature. The contents of chlorophyll a, chlorophyll b, and total chlorophyll of annual or biennial species were mainly affected by soil pH. 5) Path analysis results showed that chlorophyll a contents of grasses were mainly affected by soil factors, chlorophyll b and total chlorophyll contents were mainly impacted by atmospheric factors in the grassland habitats. Comparatively, perennial grasses were not susceptible to environmental factors so that they become more tolerant to environmental changes than the other life forms. Therefore, these plants gradually became dominant during community succession and evolution.

Key words: typical steppe, environmental factor, chlorophyll content, redundancy analysis, plant types

ZHENG Ning, LI Su-Ying, WANG Xin-Ting, LÜ Shi-Hai, ZHAO Peng-Cheng, ZANG Chen, XU Yu-Long, HE Jing, QIN Wen-Hao, GAO Heng-Rui. Dominance of different plant life forms in the typical steppe evidenced from impacts of environmental factors on chlorophyll[J]. Chin J Plant Ecol, 2022, 46(8): 951-960.

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URL: https://www.plant-ecology.com/EN/10.17521/cjpe.2021.0267

https://www.plant-ecology.com/EN/Y2022/V46/I8/951

Figures/Tables 5

References 28

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植物生活型 Plant life form	物种(采样数) Species (sampling number)
小/半灌木 Dwarf/semi-shrub	小叶锦鸡儿(6)、木地肤(4)、兴安胡枝子(4)、冷蒿(4)、狭叶锦鸡儿(1) Caragana microphylla (6), Kochia prostrata (4), Lespedeza davurica (4), Artemisia frigida (4), Caragana stenophylla (1)
多年生禾草 Perennial grass	糙隐子草(10)、羊草(10)、西北针茅(8)、芨芨草(4)、冰草(4)、大针茅(3) Cleistogenes squarrosa (10), Leymus chinensis (10), Stipa sareptana var. krylovii (8), Achnatherum splendens (4), Agropyron cristatum (4), Stipa grandis (3)
多年生杂类草 Perennial forb	银灰旋花(8)、细叶韭(7)、花苜蓿(7)、阿尔泰狗娃花(5)、黄囊薹草(4)、野韭(4)、菊叶委陵菜(3)、米口袋(3)、砂韭(2)、二裂委陵菜(2)、黄花黄芩(2)、瓣蕊唐松草(2)、兴安天门冬(2)、麻花头(1)、达乌里芯芭(1)、北芸香(1)、知母(1)、黄花葱(1)、展枝唐松草(1)、防风(1) Convolvulus ammannii (8), Allium tenuissimum (7), Melissitus ruthenicus (7), Aster altaicus (5), Carex korshinskyi (4), Allium ramosum (4), Potentilla tanacetifolia (3), Gueldenstaedtia verna (3), Allium bidentatum (2), Potentilla bifurca (2), Scutellaria viscidula (2), Thalictrum petaloideum (2), Asparagus dauricus (2), Klasea centauroides (1), Cymbaria daurica (1), Haplophyllum dauricum (1), Anemarrhena asphodeloides (1), Allium condensatum (1), Thalictrum squarrosum (1), Saposhnikovia divaricata (1)
一/二年生植物 Annual or biennial plant	狗尾草(9)、栉叶蒿(8)、猪毛菜(8)、猪毛蒿(6)、藜(6)、虎尾草(5)、尖头叶藜(5)、蒺藜(4)、刺穗藜(4)、大籽蒿(3)、雾冰藜(2)、画眉草(2)、荨麻(1)、鹤虱(1)、黄花草木犀(1)、苍耳(1)、独行菜(1)、反枝苋(1)、野亚麻(1) Setaria viridis (9), Neopallasia pectinata (8), Salsola collina (8), Artemisia scoparia (6), Chenopodium album (6), Chloris virgata (5), Chenopodium acuminatum (5), Tribulus terrestris (4), Dysphania aristata (4), Artemisia sieversiana (3), Bassia dasyphylla (2), Eragrostis pilosa (2), Urtica fissa (1), Lappula myosotis (1), Melilotus officinalis (1), Xanthium strumarium (1), Lepidium apetalum (1), Amaranthus retroflexus (1), Linum stelleroides (1)

植物生活型 Plant life form	物种(采样数) Species (sampling number)
小/半灌木 Dwarf/semi-shrub	小叶锦鸡儿(6)、木地肤(4)、兴安胡枝子(4)、冷蒿(4)、狭叶锦鸡儿(1) Caragana microphylla (6), Kochia prostrata (4), Lespedeza davurica (4), Artemisia frigida (4), Caragana stenophylla (1)
多年生禾草 Perennial grass	糙隐子草(10)、羊草(10)、西北针茅(8)、芨芨草(4)、冰草(4)、大针茅(3) Cleistogenes squarrosa (10), Leymus chinensis (10), Stipa sareptana var. krylovii (8), Achnatherum splendens (4), Agropyron cristatum (4), Stipa grandis (3)
多年生杂类草 Perennial forb	银灰旋花(8)、细叶韭(7)、花苜蓿(7)、阿尔泰狗娃花(5)、黄囊薹草(4)、野韭(4)、菊叶委陵菜(3)、米口袋(3)、砂韭(2)、二裂委陵菜(2)、黄花黄芩(2)、瓣蕊唐松草(2)、兴安天门冬(2)、麻花头(1)、达乌里芯芭(1)、北芸香(1)、知母(1)、黄花葱(1)、展枝唐松草(1)、防风(1) Convolvulus ammannii (8), Allium tenuissimum (7), Melissitus ruthenicus (7), Aster altaicus (5), Carex korshinskyi (4), Allium ramosum (4), Potentilla tanacetifolia (3), Gueldenstaedtia verna (3), Allium bidentatum (2), Potentilla bifurca (2), Scutellaria viscidula (2), Thalictrum petaloideum (2), Asparagus dauricus (2), Klasea centauroides (1), Cymbaria daurica (1), Haplophyllum dauricum (1), Anemarrhena asphodeloides (1), Allium condensatum (1), Thalictrum squarrosum (1), Saposhnikovia divaricata (1)
一/二年生植物 Annual or biennial plant	狗尾草(9)、栉叶蒿(8)、猪毛菜(8)、猪毛蒿(6)、藜(6)、虎尾草(5)、尖头叶藜(5)、蒺藜(4)、刺穗藜(4)、大籽蒿(3)、雾冰藜(2)、画眉草(2)、荨麻(1)、鹤虱(1)、黄花草木犀(1)、苍耳(1)、独行菜(1)、反枝苋(1)、野亚麻(1) Setaria viridis (9), Neopallasia pectinata (8), Salsola collina (8), Artemisia scoparia (6), Chenopodium album (6), Chloris virgata (5), Chenopodium acuminatum (5), Tribulus terrestris (4), Dysphania aristata (4), Artemisia sieversiana (3), Bassia dasyphylla (2), Eragrostis pilosa (2), Urtica fissa (1), Lappula myosotis (1), Melilotus officinalis (1), Xanthium strumarium (1), Lepidium apetalum (1), Amaranthus retroflexus (1), Linum stelleroides (1)

植物生活型 Plant life form	叶绿素含量 Chlorophyll content	回归方程 Equation of regression	R²	p
小/半灌木 Dwarf/semi-shrub	叶绿素b Chlorophyll b	C_b = 15.036 - 0.054SOC - 27.925RH	0.414	0.014
小/半灌木 Dwarf/semi-shrub	总叶绿素 Total chlorophyll	C_a+b = 1.495 - 0.040RH	0.211	0.048
多年生杂类草 Perennial forb	叶绿素b Chlorophyll b	C_b = 0.376 - 0.011LST	0.068	0.048
一/二年生植物 Annual or biennial plant	叶绿素a Chlorophyll a	C_a = 0.772 - 1.228pH	0.082	0.017
	叶绿素b Chlorophyll b	C_b = 2.164 - 0.244pH	0.114	0.005
	总叶绿素 Total chlorophyll	C_a+b = 3.741 - 0.380pH	0.117	0.004

植物生活型 Plant life form	叶绿素含量 Chlorophyll content	回归方程 Equation of regression	R²	p
小/半灌木 Dwarf/semi-shrub	叶绿素b Chlorophyll b	C_b = 15.036 - 0.054SOC - 27.925RH	0.414	0.014
小/半灌木 Dwarf/semi-shrub	总叶绿素 Total chlorophyll	C_a+b = 1.495 - 0.040RH	0.211	0.048
多年生杂类草 Perennial forb	叶绿素b Chlorophyll b	C_b = 0.376 - 0.011LST	0.068	0.048
一/二年生植物 Annual or biennial plant	叶绿素a Chlorophyll a	C_a = 0.772 - 1.228pH	0.082	0.017
	叶绿素b Chlorophyll b	C_b = 2.164 - 0.244pH	0.114	0.005
	总叶绿素 Total chlorophyll	C_a+b = 3.741 - 0.380pH	0.117	0.004