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Study on Dynamic Change of the Characteristics of Soil Fauna Community Structure in Tea Plantation and Its Effect Factor

Author: ShenYan
Tutor: LiTingXuan；ZhengZiCheng
School: Sichuan Agricultural University
Course: Plant Nutrition
Keywords: Tea garden Soil animals Community structure Dynamic changes
CLC: S154.5
Type: Master's thesis
Year: 2010
Downloads: 76
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Abstract


In this study, Mingshan mu of ecological tea garden as the object of study, the use of hand picking method and dry, wet funnel method to neighboring plantation controlled, fixed-point observation and typical sampling, the dynamic changes of the tea garden soil fauna and explore its influencing factors. The main findings are as follows: (1) The fourth quarter of the study area, a total of 11 720 soil animals (6203 tea plantations, plantation, 5517), under 5 15 classes, 32 orders, 36 classes. Tea garden soil animal communities Acarina Nematoda and bomb tail head for the dominant groups, the number of individuals accounting for the total number of 74.98%; Hymenoptera line earthworm Gang, integrated mesh Thysanoptera Araneae and Coleoptera mesh common groups, individuals The number accounted for 23.03% of the total; remaining 20 types of rare groups accounted for 4.08% of the total. The number of tea garden soil fauna, the Shannon-Wiener (H ') index, evenness index, density - group index and community complexity index was less than plantation land. Dominant tea plantations and plantation soil animals are omnivorous soil animals, followed saprophagous and predatory animals, respectively, 55.83% of the total catches, 30.55% and 5.75%, respectively. (2) The density of soil animals in the study area, the group number, the community diversity H 'and uniformity Pielou (J) index as the soil depth showed varying degrees of surface gathering. The number of soil fauna to litter layer and 0-5 cm majority of the total number of individuals of up to 8757 accounted for only 10.79% of the total 74.72% ,10-20 cm soil layer, the total allowable catch. The tea garden litter layer 5-10 cm ,10-20 cm soil community group number showed highly significant differences (P lt; 0.01), litter layer ,0-5 cm and 10-20 cm soil layer H 'index manifested as a significant difference (P LT; 0.05). (3) the number of tea garden soil fauna highest in autumn, winter and summer, followed by spring minimum; individual first increases and then to reduce the number of changes with the seasons, the peak in the autumn. C index, J index H 'index are spring tea garden soil animal community gt; summer gt; fall gt; the winter; density group index (DG) autumn gt; summer gt; winter gt; spring; complexity index of community (Cj) to fall gt; Spring gt; winter gt; summer. In addition to the individual, the similarity between the tea garden each season community were less than plantations. Tea garden soil animal community Acari / Collembola value between 1.83-4.53, were higher than the plantation land and the difference was significant (P lt; 0.05). The number of tea garden soil animal community groups, the number of individuals and communities in DG index governed by cold rain and snow affect significantly its value with the interannual was a \Tea garden community inter-annual variation in surface (0-5 cm) soil individual animals and groups of quantity, the number of small and medium-sized individual animals and a large number of animal groups by freezing weather most obvious. With the seasons and climate change, the tea garden soil animal community than plantations generate greater volatility. (4) tea garden soil fauna with plant tea service life extension of incremental density with life extension curve showed a single peak, 25 years old tea up to $ 9,775 / m2. Five plots, Nematoda always dominant groups in various communities, Hymenoptera, Collembola and Acarina part of the life of tea plantations in the dominant group. Tea garden soil animal diversity index H 'followed by eight years gt; 25 years gt; 4 years gt; 50 years gt; 16 years old tea; DG index performance for 25 years gt; 50 years gt; 8 years gt; 16 years gt; 4 years old tea; Cj index sorted by size: 25 years gt; 50 years gt; 16 years gt; 8 years gt; 4 years old tea. The Jaccard (q) coefficient between the different years of tea garden soil animal communities between 0.59-0.79, and and mostly moderately similar levels. (5) in the different years of tea garden to plant tea, and more between community characteristics and soil nutrient indicators, pH and natural moisture content showed a positive correlation with bulk density negatively correlated relationship. Soil animal community and soil total nitrogen, available phosphorus, available potassium, organic matter, and bulk density is closely related to (P lt; 0.05 or P lt; 0.01). Soil pH and soil water content and community indicators did not reach a significant correlation (P gt; 0.05).

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