Scholarly article on topic 'Study on the Relationship Between Scirpus Planiculmis Grow and Soil Water Content'

Study on the Relationship Between Scirpus Planiculmis Grow and Soil Water Content Academic research paper on "Biological sciences"

CC BY-NC-ND
0
0
Share paper
Academic journal
Procedia Environmental Sciences
OECD Field of science
Keywords
{"Scirpus planiculmis" / growth / "water content" / "Momoge wetland"}

Abstract of research paper on Biological sciences, author of scientific article — Shu-rong Hui, Qiang Liu, Zhi Song, Gui-hong Tao

Abstract Abstract. Through study on the relationship between scirpus planiculmis growth and soil in momoge wetland, It is discovered that the relationship between the average plant height and soil water content is: Y = b 0 + b 1 x + b 2 x 2 + b 3 x 3, relationship between aboveground biomass and soil water content is when it is in the key point of growth, each target of the Scirpus planiculmis such as the height, ground biomass and water content are 30.1cm, 28.5g, 22.696%, respectively; when it is in the risk center point of growth, each target of growth of Scirpus planiculmis is lower,their height, ground biomass, water content are 28.2cm, 19.1g and 20.546%, respectively; when it is in the critical point of the growth, each target of growth of Scirpus planiculmis is the lowest, their height, ground biomass, water content are 22.6cm, 2.809g and12.917%, respectively.

Academic research paper on topic "Study on the Relationship Between Scirpus Planiculmis Grow and Soil Water Content"

Available online at www.sciencedirect.com

SciVerse ScienceDirect

Procedia Environmental Sciences 10 (2011) 2022 - 2028

2011 3rd International Conference on Environmental Science and Information Application Technology (ESIAT 2011)

Study on the relationship between scirpus planiculmis grow

and Soil water content

Shu-rong Hui1a, Qiang Liu 2, Zhi Song1 and Gui-hong Tao1 a*

College of Science, Shenyang Agricultural University, Shenyang 110161 China 2College of information and electric engineering, Shenyang Agricultural University, Shenyang, 110866 China

ShishunZhu069@126.com

Abstract

Abstract. Through study on the relationship between scirpus planiculmis growth and soil in momoge wetland, It is discovered that

the relationship between the average plant height and soil water content is:

Y=b0 + bx+b2X + b3xX

, relationship between

aboveground biomass and soil water content is: ' v J ; when it is in the key point of growth, each target of the Scirpus

planiculmis such as the height, ground biomass and water content are 30.1 cm, 28.5 g, 22.696%, respectively; when it is in the risk center point of growth , each target of growth of Scirpus planiculmis is lower ,their height, ground biomass, water content are 28.2cm, 19.1g and 20.546%, respectively; when it is in the critical point of the growth , each target of growth of Scirpus planiculmis is the lowest, their height, ground biomass, water content are 22.6cm, 2.809g and12.917%, respectively.

© 2011 Published by Elsevier Ltd. Selection and/or peer-review under responsibility of Conference ESIAT2011 Organization Committee.

Keywords: Scirpus planiculmis, growth, water content, Momoge wetland

l.Introduction

Xiang hai, momoge, zha long, horqin in the Songnen plain, etc. nature reserve is for the White crane (Grus leucogeranus) spring and autumn seasons on North-South and from the migratory routes of transit, in which momoge wetland nature reserve the maximum residence time, up to 30 ~ 40d; count the most, the population is stable at around 1000, only about world population by 20% , home of the world's migration to the head, as the Global Environment Facility (GEF) in our selected 5 "White crane global protection project" implementation of the land. Through field trips and white crane waste analyses,the underground plant bulbs of scirpus planiculmis etc are the main food origin of white crane. However, the

* Corresponding author. Tel.: +0-000-000-0000 ; fax: +0-000-000-0000 . E-mail address: a ShishunZhu069@126.com

1878-0296 © 2011 Published by Elsevier Ltd. Selection and/or peer-review under responsibility of Conference ESIAT2011 Organization Committee. doi: 10.1016/j.proenv.2011.09.317

grow condition of scirpus planiculmis is destroyed. White cranes in the region of the outage and food trends of declining year by year, threatening their survival. Study on the relationship between dynamic growth of Scirpus Planiculmis and the key environmental factors is very necessary and helpful in both wetland recovery and Grus leucogeranus conservation.

2.material and method

2.1. Research district profile

Momo lattice wetland locates in zhen Lai county, eastern bai cheng city ,jilin province, which is 14.4 million hm2, accounting for zhen Lai county town of 26 % area. Its geographic latitude 45°45 46°10' and east longitude 122°27' ~ 124°04'; Its annual average temperature, average annual rainfall frost-free period relative humidity annual evaporation are 4.4°C, 412mm,135d , 59%, 1553mm respectively, which is temperate continental climate.

2.2. Test method and design

Choose white crane feeding and periphery vegetation community distribution obvious grass as the research sample ruffle meadow, which is from the shore, water depth began around 25cm according to the decline trend of scirpus planiculmis , around to randomly selected representative 1-m x 1-m .Record the height,density,grow status etc(randomly selected 5 strains for average),scissor 4~6 scirpus planiculmis , after survey about 10cm deep soil in this location. (scirpus planiculmis roots mainly distributed in about 10cm).

2.3. Data acquisition

Growth indices of scirpus planiculmis: plant height with tape measure, density with mesh method , Take the scirpus planiculmis in 80 °C to get the dry average weight.Determination of soil water content: method of drying and weighing.

Fig. 1 The relationship between the average height of the Scirpus planiculmis and soil water content. ; Fig. 2 The relations between biomass of the Scirpus planiculmis and soil water content.

3. Results and analysis

Relationship between growth of scirpus planiculmis and soil water content.Modeling and analysis:Select average height and above-ground biomass per unit area dry weight as its growth targets for research.

3. ¡Relationship between soil water content and growth indices: average plant height, above-ground biomass and soil moisture content of the original scatter chart (Fig. ¡, 2).

© o °0 n O 04 0oo Q

° 8 ° §P° %>° o ° ° o °0 ° ° o ° ° ° ° ° c?

Soil water content (g/g)

0 i i o

o Os ^

o O ° O © °

o ° O ° o° „o° O

8 ° o „ ® °rCoO(S, QcQ O O °

0 o 9> ° o °00 CT 0®o0 oe

Soil water content (g/g)

Fig. 3 The scatter chart of coordinate system system between the risk height and soil water content;Fig. 4 The scatter chart of coordinate between the risk biomass and soil water content.

between the risk height and soil water content. between the risk biomass and soil water content. By analysis of average plant height, above-ground biomass and soil moisture content of the original scatter chart, reach the model of average height and soil water content as well as model of above-ground biomass and soil water content which are cubic equations and the Logistic curve, respectively : Yah = 26.611 - 0.222xwc - 0.038xWc + 0.0024xWc,R = 0.787, p < 0.01,

Yab = 1/ (j1 +16.799x 0.739xw j,R = 0.700, p < 0.01.

By scatter charts 1, 2: when the soil water content of maximum, above-ground biomass fluctuations are very large, and as the water content reduces this wave gradually weakened and achieve a balance ;Explain this phenomenon: mainly external factors interfere with the normal growth of scirpus planiculmis.Through images and combined with theory to know: The cubic equation that soil water content and average height of scirpus planiculmis fit has a extremum value.After analysis of growth and surrounding communities we call this inflection point as critical point of scirpus planiculmis and get its limit value (12.917%,22.6); When soil moisture is less than 12.917%, scirpus planiculmis will no longer grow which lose the ability to restore the good growth under the separate case of soil water content. And logistic curve in Figure 2 of soil water content and aboveground biomass of scirpus planiculmis fit has a inflexion point(u /2 ),whose value (22.696%,28.5). scirpus planiculmis biomass fluctuations of the most dramatic at this point that is the key to growth. This means that once the soil water content is less than 22.696%, scirpus planiculmis growth capacity will decline rapidly. while under the critical point scirpus planiculmis cannot refresh; Considering the related equations,the growth could be calculated:the above-ground biomass is 2.809g per unit area and average height is 30.1cm under the critical point.

3.2Soil water content and growth of scirpus planiculmis risk index:

To study scirpus planiculmis growth, we will select the scatter points between growth point and critical point for individual research. (coordinate system of risk biomass and soil water content scatter chart in Fig. 3; coordinate system of height and soil water content risk scatter chart in Fig. 4). In order to distinguish it from previous research, for the fall in the key points and growth critical point of scatter we give a new definition: growth risks scatter (certain degree of risk in the region).Respectively analysis of risk biomass and risk height: take soil water content for 20% near of points, corresponding appropriate above-ground biomass and strains high as original point of new coordinate system. Almost all the scatter points fall in the first, second and third quadrant, few in forth quadrant. Points falling in one or two quadrant reach smooth steep curve and third quadrant of points as water content of decline overall present smooth decline trend. Such can be explained: as soil water content fell to growth key points, growth state of scirpus planiculmis sharp decline. Some with strong ability could contain their original state under the point soil water content, but others do not. All must die out as the soil water content below the critical point. In order to quantify this trend and identify the new coordinates of the origin of the above mentioned, one and two quadrant scatter points are select to fit analysis (normal growth in the third quadrant, omitted); Through the observation for scatter charts, dry weight of plant height, above-ground biomass and soil water content in one and two quadrants are fitted using quadratic equation. (plant height , aboveground biomass and soil water content of raw numbers and fitting model in Figure 5 and Figure 6 respectively).

19.000 20.000

21.000 22.000 23.000

Soil water content (g/g) Soil water content (g/g)

Fig.5 The relationship between the height in the 1, 2 quadrants and soil water content;Fig.6 The relationship between the biomass in the 1, 2 quadrants and soil water content

In order to quantify this trend and identify the new coordinates of the origin of the above mentioned, one and two quadrant scatter points are select to fit analysis (normal growth in the third quadrant, omitted); Through the observation for scatter charts, dry weight of plant height, above-ground biomass and soil water content in one and two quadrants are fitted using quadratic equation.

We present the inflection point of the quadratic equation fitted: inflection point of plant height and soil water content in one or two quadrant is (20.183%,28.1),and inflection point of one and two quadrant biomass and soil water content is (20.546%,19.100); The two inflection points coordinates should be the new coordinate origin we are looking for, and now we give the definition for Scirpus planiculmis midpoint on the growth of risk. But considering their growth conditions overall, you should select water content as midpoint coordinates that is inflexion aboveground biomass and water content; Then biomass is 19.100g and plant height is 28.2cm by the equation of plant height.

3.3.To more detail effect of soil water content on the growth of Scirpus planiculmis, Hazard Function is defined: the growth state function from growth key points to growth critical point, h (x).

Hh (xwc )

Hab (xwc ) =

402.879-37.138xwc +0.920x1 (20.138% < x^ <22.696%), 26.611-0.222xwc -0.038x:^ +0.0024x3, (22.696%< x^ <12.917).

954.578 -91.059x + 2.216x2 (20.546% < x < 22.696%),

WC WC V WC

-1-(22.696% < xwc < 12.917%).

— +16.799 x 0.739x 57

4. Results and discussion

4.1Relationship between growth and soil water content

In the overall analysis, average height, dry weight of the aboveground biomass unit area and soil water content significantly related, the coefficient of determination is 0.787, 0.770, respectively. At risk in the region of plant height and aboveground biomass , indicate by a piecewise function from the growth of the key points to growth risks used quadratic equations to fit it, they are also a significant correlation, the determination coefficient 0.667,0.815; Regression equations are used for growth risks to growth critical point.By regression analysis, growth State with three fluctuations points has four stages, these points respectively : growth key points, and growth risk midpoint, and growth critical point; and correlated growth index : growth key points (average height 30.1cm, above-ground biomass of unit area 28.5G, soil water content 22.696%); growth risk midpoint (average height 28.2cm, above-ground biomass of unit area 19.1g, soil water content for 20.546%); growth critical point (average height 22.6cm, above-ground biomass of unit area 2.809g, soil water content for 12.917%).The hazard function are presented ;Through the functions, the growth state could be got for the renew of Scirpus planiculmis.

4.2Observations and recommendations for scirpus planiculmis recover

Good of wetland ecological depends on the quantity and quality of water supply, without adequate water resources, wetland ecological survival is impossible, and water is an effective means of controlling soil salinity. Therefore, the reasonable development and utilization of water resources and seek to develop

new water resources are the most important.Under limited water resources, restore good growth should satisfy the condition that soil salinity drops below the critical value and get the maximum profit.Some protected area management measures should be strengthened to minimize interference from the outside world to prevent degeneration.

Acknowledgments

The authors would like to thank the Liaoning province Science Fund (20102201) and the department of Liaoning university research project (2008626) for their financial support of this research.

References

[1]H.J.Bai,et al. Spatial Distribution of Nitrogen and Phosphorus in Soil of Momoge Wetland, Journal of Soil and Water Conservation.2001, 15(4):79~81.

[2] H.M.Li,and J.F.Wang. A Study on the model for dimulating single species population affected by ecological strategy , Journal of Biomathematics.1994,9(4):207~213.

[3]K.H.Li,et al. Relationships between aboveground biomass and environmental factors along an altitude gradient of alpine grassland, Chinese Journal of Applied Ecology.2007,18(9):2019~2024.

[4]Y.Qu. Amelioration on a growth model of plants in a wetland and its dynamic computer simulation and analysis, Acta Botanica Boreali-Occidentalia Sinica.2004,24(3):418~423.

[5]Q.Q.Liu,et al. Effect of soil moisture on biomass of meadow steppe, Journal of Arid Land Resources and Environment.2005,19(7).

[6]Q.S.Li,et al. Sodium bicarbonate soil management and utilization in songnen plain , Resources Science.2003, 25(1):15-201.

4. Results and discussion

4.1Relationship between growth and soil water content

In the overall analysis, average height, dry weight of the aboveground biomass unit area and soil water content significantly related, the coefficient of determination is 0.787, 0.770, respectively. At risk in the region of plant height and aboveground biomass , indicate by a piecewise function from the growth of the key points to growth risks used quadratic equations to fit it, they are also a significant correlation, the determination coefficient 0.667,0.815; Regression equations are used for growth risks to growth critical point.By regression analysis, growth State with three fluctuations points has four stages, these points respectively : growth key points, and growth risk midpoint, and growth critical point; and correlated growth index : growth key points (average height 30.1cm, above-ground biomass of unit area 28.5G, soil water content 22.696%); growth risk midpoint (average height 28.2cm, above-ground biomass of unit area 19.1g, soil water content for 20.546%); growth critical point (average height 22.6cm, above-ground biomass of unit area 2.809g, soil water content for 12.917%).The hazard function are presented ;Through the functions, the growth state could be got for the renew of Scirpus planiculmis.

4.2Observations and recommendations for scirpus planiculmis recover

Good of wetland ecological depends on the quantity and quality of water supply, without adequate water resources, wetland ecological survival is impossible, and water is an effective means of controlling soil salinity. Therefore, the reasonable development and utilization of water resources and seek to develop new water resources are the most important.Under limited water resources, restore good growth should satisfy the condition that soil salinity drops below the critical value and get the maximum profit.Some protected area management measures should be strengthened to minimize interference from the outside world to prevent degeneration.

Acknowledgments

The authors would like to thank the Liaoning province Science Fund (20102201) and the department of Liaoning university research project (2008626) for their financial support of this research.

References

[1]H.J.Bai,et al. Spatial Distribution of Nitrogen and Phosphorus in Soil of Momoge Wetland, Journal of Soil and Water Conservation.2001,15(4):79~81.

[2] H.M.Li,and J.F.Wang. A Study on the model for dimulating single species population affected by ecological strategy , Journal of Biomathematics.1994,9(4):207~213.

[3]K.H.Li,et al. Relationships between aboveground biomass and environmental factors along an altitude gradient of alpine grassland, Chinese Journal of Applied Ecology.2007,18(9):2019~2024.

[4]Y.Qu. Amelioration on a growth model of plants in a wetland and its dynamic computer simulation and analysis, Acta Botanica Boreali-Occidentalia Sinica.2004,24(3):418~423.

[5]Q.Q.Liu,et al. Effect of soil moisture on biomass of meadow steppe, Journal of Arid Land Resources and Environment.2005,19(7).

[6]Q.S.Li,et al. Sodium bicarbonate soil management and utilization in songnen plain , Resources Science.2003, 25(1):15-201.