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Optimization of Ecological Recovery Model for Arid Region in Loess Plateau Based on the Eco-indicating Effect of Soil Fauna

Author: WangYi
Tutor: YangXingZhong
School: Northwestern University
Course: Zoology
Keywords: Soil animals Environment Indication Loess Plateau Ecological restoration
CLC: S154.5
Type: Master's thesis
Year: 2011
Downloads: 54
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Abstract


In this study, the indication of the role of the loess plateau soil macrofauna emplaced 16 field plots , two years of survey sampling and laboratory experimental work in the study area in Dingxi City , Gansu Province , Longtan small watershed . Study the distribution characteristics of soil animal , and environmental conditions , the building used for the arid environmental remediation evaluation methodology , and preferred a drought-tolerant tree species , the final selection of the drought recovery mode suitable for the study area , the study results show that : ( 1) The study area is very dry , the vegetation is very scarce soil animal food sources are limited, and the quantities and types of soil animals is relatively scarce . The collected soil animals belonging to a two outlines , eight orders, 23 families . The dominant groups Formicidae paederus Branch, Flower Pentatomidae common groups Cicadellidae flower firefly Division , Carabidae Section . The horizontal distribution of different soil animals ability to adapt to the environmental conditions showed significant differences , five different vegetation types of soil animals : the number of individuals of the group number of performance : Caragana microphylla gt ; wild apricot gt ; P. tabulaeformis gt; oriental arborvitae gt; mountain peaches . Vertical distribution has obvious surface characteristics , that is , the number of groups and individuals have shown to ( 0 - 5 cm ) gt ; ( 5 -10cm ) gt ; ( 10 -15cm ) . ( 2 ) of the five species of different drought physiological indicators analysis results show that , for each species a significant difference in the presence of physiological responses to drought stress subordination method of fuzzy mathematics comprehensive evaluation of five species of drought-tolerant , and sort the results for : Caragana microphylla gt ; oriental arborvitae gt ; P. tabulaeformis gt ; wild apricot gt ; mountain peaches , based on gray correlation degree method for calculation of the value of each and drought indicators of the the drought degree of association : proline gt ; chlorophyll gt ; bound water / free water gt; glutathione gt; malondialdehyde gt ; soluble sugar . (3) evaluation of the ecological benefits of different vegetation restoration patterns based environment indicates the role of soil animals Sort results : Caragana microphylla gt ; wild apricot gt ; P. tabulaeformis gt ; oriental arborvitae gt ; mountain peaches , and description of Caragana microphylla recovery mode is not only able to adapt arid environment , but also to produce a better eco-efficiency , and therefore is the preferred mode of the semi- arid region of the Loess Plateau ecological Restoration . Mountain the peaches mode not only poor adaptability , its ecological benefits not as other modes .

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CLC: > Agricultural Sciences > Agriculture as the foundation of science > Soil > Soil Biology > Soil Zoology
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