Earthworm communities in a wet agricultural landscape of the Seine Valley (Upper Normandy, France)
Earthworm communities in a wet agricultural landscape of the Seine Valley (Upper Normandy, France)
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DOI：
10.1016/s0031-4056(04)70226-7
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发表时间：
2003-01-01
期刊：
影响因子：
2.3
通讯作者：
Margerie, P
中科院分区：
文献类型：
--
作者：
Decaëns, T;Bureau, F;Margerie, P
本研究旨在描述法国上诺曼底塞纳河流域湿地蚯蚓群落结构的驱动因素。沿着1300米的样带选择了15个地块，代表了该地区主要的农业生态系统（即树木系统、果园、草地、作物）和土壤类型（即FLUVIOSOL、REDUCTISCIL、HISTOSOL和COLLUVIOSOL）。每个地块采用福尔马林提取和手工分选相结合的方法采集5个样本。对蚯蚓进行了种级鉴定，并进行了计数和称重。社区对农业集约化反应显著。中等强度系统的平均生物量、密度和多样性最高（果园分别高达119.7 g鲜重m（-2）、309.3 ind m（-2）和7.2 Sp m(-2)）。土壤类型仅对群落组成和多样性有显著影响。采用广泛的描述参数进行主成分分析。前两个轴占总惯量的50.8%。它将树木系统（内源性和表观性优势，低总密度，生物量和多样性）与果园和草地（内源性和/或轶事性优势，高多样性和密度）和作物（低多样性，生物量和密度）分开。根据土壤类型排序，将低洼土壤（内源性和外源性优势，低多样性，高密度）与排水良好的土壤（内源性优势，高密度和多样性）分开。在景观尺度上，农业活动和自然土壤异质性是影响群落组成和结构的环境过滤器。在土壤类型斑块尺度上，土壤类型主要决定蚯蚓群落组成，而在农业样地尺度上，农业实践对蚯蚓群落结构的影响更大。
This study was carried out to describe the driving factors responsible for earthworm community structure in a wet landscape of the Seine Valley (Upper Normandy, France). Fifteen plots were selected along a 1300 m transect, representing the main agroecosystems (i.e. wooded systems, orchards, grasslands, crops) and soil types (i.e. FLUVIOSOL, REDUCTISCIL, HISTOSOL and COLLUVIOSOL) in the area. Five samples were taken in each plot using a combination of formalin extraction and hand sorting. Earthworms were identified to species level, counted and weighed.Communities responded markedly to agricultural intensification. The highest mean biomass, density and diversity were observed in the medium intensity systems (up to 119.7 g fresh weight m(-2), 309.3 ind m(-2), 7.2 Sp m(-2) in orchards, respectively). Soil type only had significant effects on community composition and diversity. A principal component analysis was performed with broad descriptive parameters of communities. The first two axes accounted for 50.8 % of the total inertia. It separated wooded systems (endogeics and epigeics dominant, low total density, biomass and diversity) from orchards and grasslands (endogeics and/or anecics dominant, high diversity and density) and crops (low diversity, biomass and density). The ordination of plots according to soil type segregated ow-lying soils (endogeics and epigeics dominant, low diversity, high density) from better-drained soils (anecics dominant, high density and diversity).Agricultural activities and natural soil heterogeneity are environmental filters that shape community composition and structure at the landscape scale. In the present study, soil type mainly determined earthworm community composition at the scale of soil type patches, while agricultural practices had a stronger impact or, community structure at the scale of the agricultural plot.