Scholarly article on topic 'Study on the relationship between scirpus planiculmis grow and Soil salinity'

Study on the relationship between scirpus planiculmis grow and Soil salinity Academic research paper on "Agriculture, forestry, and fisheries"

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Procedia Environmental Sciences
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{"scirpus planiculmis" / "growth threshold" / salinity / "momoge wetland"}

Abstract of research paper on Agriculture, forestry, and fisheries, author of scientific article — Qiang Liu, Zhi Song

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 salt content is:, relationship between aboveground biomass and soil salt content:; The critical growth value of the Scirpus planiculmis without or with small outside interference is relatively small; their height, ground biomass, salinity content are 24.4cm, 4.745g and 1.100%, respectively; when there is outside interference in a certain time, the critical value of growth of Scirpus planiculmis is high,their height, ground biomass, salinity content are 23.2cm, 4.179g and 0.977%, respectively.

Academic research paper on topic "Study on the relationship between scirpus planiculmis grow and Soil salinity"

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Procedia Environmental Sciences 10 (2011) 2016 - 2021

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

Study on the relationship between scirpus planiculmis grow

and Soil salinity

Qiang Liu1a,Zhi Song2b a*

1College of Science, Shenyang Agricultural University, Shenyang 110161 China 2College of information and electric engineering, Shenyang Agricultural University, Shenyang, 110866 China

gqliuwhu62@sohu.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 salt content is: , relationship between aboveground biomass and soil salt content: ; The critical growth value of the Scirpus planiculmis without or with small outside interference is relatively small; their height, ground biomass, salinity content are 24.4cm, 4.745g and 1.100%, respectively; when there is outside interference in a certain time, the critical value of growth of Scirpus planiculmis is high ,their height, ground biomass, salinity content are 23.2cm, 4.179g and 0.977%, respectively.

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

Key words: scirpus planiculmis, growth threshold; salinity; 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 1 000, 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 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 of..

* Corresponding author. Tel.: +0-000-000-0000 ; fax: +0-000-000-0000 . E-mail address: aliuqlh@sina.com.cn, bsongzhi666666@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.2011.09.316

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

The determination of soil salinity: get 5 g dry soil sample and 25 g water in the tube, using oscillator concussion 20min, after 24h measure conductance values with dry mercury electrode. According to the conductivity temperature correcti onvalues ,calculate the salt content (percentage).

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.

3. Results and analysis

3. 1Survey to community types and evolution

Types of sequence evolution is Echinochloa and Phragmites communis-- scirpus planiculmis and Suaeda glauca connected to moisture conditions.By the transition of scirpus planiculmis, it is distributed in shallow water area and shore mudflats. Scirpus planiculmis may be disappeared with decline of moisture and salt optimization.

3. 2Relation of soil salinity and scirpus planiculmis growth indices

Determine dry weight as indices with the average height and unit area.©Through the scatterplot chart analysis, fit three times equation and composite curve with average height, dry weight and soil salinity, and show with negative correlation(P<0.01), judgement coefficients are 0.620, 0.720. The model is reliable through F test.

Return of the cubic equation models: 7 = b°+ bx+b2+ b3; Growth curve model:

7 ~ e (abscissa: average plant height; ordinate: biomass and soil salinity of raw numbers Fig.1, Fig.2; regression equation table 1)

60 u 50

"g 30 o

M k ♦

* *MNw 4 %

500 1000

soil salinity content(g/kg)

Fig. 1 relation of average height and salt salinity Fig. 2 relation of biomass and salt salinity

Table 1 regression equation of maximum plant height mh ,maximum biomass mb and soil salinity ss

Equation Correlation significance level

coefficient

Ymh = 46.989- -7L415Xss + 72305X2ss - 24.680X3 0.620 <0.01

Y mb - e"(3.953 - 2.528Xss) 0.720 <0.01

By regression analysis, the grow is depend on soil salinity .Through images and combined with theoretical know: Composite series we are fitting curve without exist inflection points, however cubic equation contains a significant inflection point.After analysis and investigation on the growth and surrounding communities of scirpus planiculmis, call this turning point as growth change tipping point, through the derivation of the cubic equation numerical solution for the inflection point: Average plant height and inflection points, respectively the salinity equation 0.977%,23.2.Salt content description in a separate consideration of circumstances,When the salt content is greater than 0.977%, scirpus planiculmis will no longer grow; Computed from the equation of aboveground biomass, biomass is 4.179g at this time.Through the scatterplot Fig. 1, 2 observe a phenomenon: When soil salinity available for scirpus planiculmis best, the growth of fluctuations is very large, but along with the salinity increases the wave weaken gradually, finally reach a minimum balance.After analysis and combining field investigations to explain this phenomenon: Investigation of scirpus planiculmis has been in some disturbance factors undermining,for example:cattle, condition etc,in which cattle is the main reason. Growth fluctuation along with increase in salinity to weaken and ultimately achieve balance .©For accurate research of scirpus planiculmis, we will select some representative samples with few interfere,then, reorder the soil salinity from small to large, Determination of salinity minimum starting every 5 salt content is divided into a group, salt content from each group of 5 to find their corresponding average aboveground biomass of plant height and the maximum value,and then fit analysis (Fig.3,Fig.4) .Through maximum height, maximum biomass for samples and analysis of the relationship between soil salinity, followed by cubic equations and Growth curve fitting and significant correlated (P<0.01) .The coefficients of determination are respectively 0.876, 0.829. Through the F-test, models reached a significant level with

reliability; three regression models is: Y ~b0 + bx+bx + bx ; growth curve model

Y — e( a +a1x)

models is: regression equation is in table 2.

♦V ♦

500 1000

soil salinity content(g/kg)

Fig. 3 relation of maximum height and salt salinity;Fig. 4 relation of maximum biomass and salt salinity

Table 2 regression equation of average plant height ah , biomass ab and soil salinity ss

Equation Correlation coefficient significance level

Yau = 53.971- -76907Xss + 68216X2» -20.672X3 0.876 <0.01

Y 1 ab - e* (4.406 - 2.59) 0.829 <0.01

4.4 By fitting to the equation, the inflection points of the cubic equation are 100%, 24.4, when the soil salinity is greater than 1.1%, flat rods scirpus planiculmis would lose the ability to recover good growth conditions, at which time the aboveground biomass is 4.745g.

Select those better (smaller by outside interference),From Figure 4 you can see the fluctuations and overall analysis of the data is different:Starting without fluctuation, began to appear when the salt content slightly increased fluctuations in subsequent waves gradually increased, and to a certain degree of fluctuation and began to slow, and has stabilized; This situation is likely to be caused by competition between the vegetation. Because the found in field surveys: in shallow water or the water's edge, scirpus planiculmis is a leading community, almost no other vegetation appears, in which case, it is free to absorb nutrients; While leaving the shallow waters near, there have been some other vegetation, such as: Setariae Viridis, Chenopodium hybridum producing a certain degree of competition; The effect of strong growth capacity of scirpus planiculmis is small, but weaker anti-interference ability would have been larger, then forms different growth. At last,more distance competition will be fierce. But when arrived at a distance because the soil conditions, its own growth will decline, at which point it is already dominant species change gradually for vulnerable populations. Therefore, effects of competition will not be great, its volatility has stabilized. Fluctuations not as obvious as in Figure 4 in Figure 3, is most likely because in the area of competition, other main effect of scirpus planiculmis vegetation density,

relatively little influence on plant height, so fluctuations in biomass and plant height fluctuation of relatively small.

By regression equations or images we can see: Under the same conditions of salt content, Small disturbance of growth is better than those who have been destroyed, And that they are able to withstand the salinity minimum must be above the average, Description of external noise of scirpus planiculmis is better than the destruction of scirpus planiculmis. Whether serious interference by the outside world or are subject to less interference, we can only be said to have lost the ability to restore good growth conditions, cannot be said that they had wither deaths. Growth fluctuations because it has stabilized description within a certain stage , it can still maintain this level of growth, This may be due to the long term under the influence of local soil habitats, Has been part of scirpus planiculmis adapted to this environment, improving the adaptability of the ecological, which makes it possible to also appear in the wet and dry vegetation and vegetation.

4.Results and discussion

4.1.In the study community

study area types mainly according to the "Echinochloa and Phragmites communis — Typha angusttifolia and scirpus planiculmis— scirpus planiculmis-- scirpus planiculmis and Suaeda glauca into the order of five communities in areas, scirpus planiculmis belonging to the community group.

4.2.Relation of scirpus planiculmis grow and Soil salinity:

overall average height of the upper flat bars of scirpus planiculmis, aboveground biomass of dry weight per unit area and soil salinity as a significant negative correlation, the coefficient of determination are 0.620> 0.720, respectively.Noise analysis of scirpus planiculmis of relatively flat, they have become a significant negative correlation, and the coefficient of determination are reached, 0.876 > 0.829.

Through the regression analysis, scirpus planiculmis growth we can used to estimate soil salinity content, or you can forecast scirpus planiculmis growing through the soil salinity; Increased soil salinity would limit plant growth, and the limited extent by fitting equation can be analyzed.

Determine the inflection points: In the case of certain interference, scirpus planiculmis to soil salinity 'maximum is 0.977%, height is 23.2cm, and aboveground biomass is 4.179 g; In the case of relatively little interference, its capacity has increased, salinity is 1.1%, plant height is 24.4cm, the biomass is 4.745g.

4.3.Some of the observations and recommendations for scirpus planiculmis recover

Good wetlands are dependent on the supply of water to maintain the quality and quantity of» Water is the basis , Without adequate water resources» Wetland ecology is unlikely to survive. Also, water is an effective means to control soil salinization. Therefore, rational exploitation and utilization of water resources and seeks to develop new water resources is to restore the growth of the most important. Under conditions of limited water resources, At least will be able to restore the good growth of scirpus planiculmis growth fall below critical values for the following regional soil salinity, maximum area so that you can restore scirpus planiculmis. Management measures should be strengthened in a number of protected areas to minimize the adverse interference from the outside world to prevent scirpus planiculmis population degradation.

Acknowledgement

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.

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