Linear features and butterflies: the importance of green lanes

Green lanes are unmetalled tracks between fields of variable width, which may be sunk below or raised above field level, and bounded on both sides by ‘grass’ banks, hedgerows or dry-stone walls. In the UK they have no unique planning status and have been overlooked as discrete landscape elements. Green lanes were surveyed for butterflies in 1997 on lowland arable farmland on the Trafford/north Cheshire border (Warburton) and on upland grassland in the Yorkshire Dales (Ribble Valley). At the lowland site the green lanes were bounded by vegetation and were compared with grass banks and single hedgerow field boundaries; at the upland farm, the green lanes were bounded by dry-stone walls and were compared with grass banks and single dry-stone walls. Data from earlier work on a largely arable farm (Manydown) in Hampshire in 1987 and 1988 were re-analysed to make comparisons between a green lane, the rides and glades of two coppiced woodlands, and the grass banks and single hedgerows surrounding arable fields. Green lanes, whether bounded by vegetation or stone were superior to other common farmland biotopes with the exception of woodland, in terms of both butterfly abundance and species richness.Multiple regression of the Warburton data indicated the importance of green lanes, adjacent habitat type, and nectar sources for species richness and butterfly abundance. The interior of green lanes had lower windspeeds, and more bramble nectar sources than hedgerows or grass banks. By their nature they occupy a larger area of uncropped land, and are subject to a reduced disturbance regime and reduced inputs of agrochemicals and fertilisers. Their value as biodiversity reservoirs in intensively managed land is likely to be high.     

Effects of landscape complexity on farmland birds in the Baltic States

Data on birds occurring in farmland in the Baltic States of Estonia, Latvia and Lithuania were related to the spatial organisation of farmed habitats in three different agricultural landscape types. Species richness, abundance, and diversity of farmland bird communities, as well as abundance of the most frequently observed species were positively related to the number of residual non-cropped elements within farmland, the local mixture of annual crop and grass fields, and the variety of field types. The positive association of the species richness and abundance of the farmland bird community with richness in residual habitats and crops was most prominent in open landscapes. The results suggest that, by simplifying farmland structure and making it more homogenous, EU agricultural policies will have a detrimental effect on farmland bird populations in Eastern Europe. Ways of better targeting of the agri-environment schemes are suggested.     

Effects of management cessation on grassland butterflies in southern Poland

The effects of natural succession and invasions of indigenous reed Phragmites australis and alien goldenrods Solidago sp. on butterfly communities of wet grassland were investigated in Kraków (southern Poland) after management cessation.The total number of species and individuals, mean number of species per survey and a species diversity (Shannon-Wiener index) were highest in fallow lands, old fallow lands and young forests, and the lowest in fallow lands invaded by reed and goldenrod and in mature forests. These results (1) reveal the importance of extensively mown meadows and fallow land for butterflies, (2) indicate that meadow restoration is still possible even several decades after abandonment and (3) show that invasion of reed and non-native goldenrods should be prevented.A few very rare species included in the Habitat Directive (Lycaena dispar, Lycaena helle, Maculinea teleius and Maculinea nausithous) were common on the wet grasslands in Krakow, thus the area should be protected. Moreover, it was shown that the presence and relative abundance of Maculinea butterflies were good indicators of general butterfly species richness and abundance in the investigated wet grasslands.     

Community richness and stability in agricultural landscapes: The importance of surrounding habitats

In this paper, the role played by habitat diversity in the landscape on species richness and on the stability of farmland bird communities was investigated. Species richness was estimated on 374 samples monitored in farmland by the French breeding bird survey during the 2001–2005 period. A capture–recapture approach was used to estimate species richness accounting for the variation in detection probability among species of the 100 most common species detected in farmland. Landscape structure and composition were measured both in farmland and in adjacent habitats. The independent effect of each variable on community richness and stability was further assessed using hierarchical variance partitioning and taking spatial autocorrelation into account. A strong matrix effect was detected: non-cropped land deeply influenced richness and stability of bird assemblages.     

Breeding birds in short-rotation coppices on farmland in central Sweden—the importance of Salix height and adjacent habitats

Plantations of short-rotation coppice (SRC) have a potential for being a useful measure to stop the ongoing impoverishment of farmland biodiversity by increasing structural diversity, and decreasing cultivation intensity and use of pesticides in intensively managed farmland landscapes. The aim of this study was to investigate the relative importance of the structure of the plantation and composition of adjacent habitats for breeding birds in 41 SRCs (meansize±S.E.=9.4±1.6 ha). Mean number of species per ha in the SRCs was 2.8±0.3 species and there were more farmland birds (32 species, 808 territories) than forest birds (22 species, 400 territories). A major result of the present study was the strong influence of adjacent habitats on bird community composition (18 of 22 analysed species affected). There were large differences in bird communities between forest-bordered and open-bordered sites, but occurrence of residual habitats (i.e. other habitats than forest, pastures, shrub areas and arable fields) was also associated with occurrence of several species. The second factor of major importance for the bird fauna was the height of the plantations. Most species (14) were associated with tall plantations (>2 m), seven species were associated with plantations of intermediate (1–2 m) height, and six species were associated with plantations of low height (<1 m). A comparison of ecological traits between species classified as preferring SRC and species classified as avoiding SRC suggests that nest height was the only ecological character associated with a preference for Salix habitats, i.e. species with nests on the ground or in shrubs were more abundant in Salix habitats than in farmland landscapes in general. However, a broad spectrum of species was found in the SRCs and many of these seemed to be dependent on habitat features outside the plantations. Planting of Salix in intensively managed farmland plains will have positive effects on bird diversity by increasing the structural diversity of the landscape. In contrast, plantations on infields in forest-dominated landscapes will have negative effects, since the mosaic structure (i.e. mixture of open and forested habitats) positive for most farmland birds will disappear, and Salix plantations favour relatively few forest species. Additionally, Salix could be planted along sharp edges between coniferous plantations and open farmland in order to increase the complexity of the ecotone in intensively managed forest-farmland landscapes.     

新疆鸟类和哺乳动物物种丰富度空间异质性及其多尺度效应

基于新疆维吾尔自治区鸟类和哺乳动10km×10km物种空间分布数据及1km×1km土地利用数据,引入NDVI、海拔和地理纬度等辅助数据,分别对物种和土地利用数据进行尺度变换,计算分析了1～10km尺度下的景观指数,并进一步在生态系统层面进行尺度效应研究,以探究表征物种多样性空间异质性的合理尺度.结果表明:新疆总体的景观...     

密云水库底泥和库滨区土壤中氨氧化细菌的多样性和丰度

采用分子生物学方法（T-RFLP、定量PCR）研究了密云水库底泥沉积物和库滨带土壤中氨氧化细菌（AOB）的多样性和丰度特征,并使用Canoco for Windows 4.5软件和皮尔森相关系数法,探究了环境因子对AOB群落的影响.结果表明,沉积物和库滨区土壤中AOB的多样性和数量都存在较大的差异.其中,AOB群落被聚成两大类：沉积物与土壤.沉积物样品中AOB群落结构与其它样品差异较大.沉积物中AOB的多样指数最低,而在农田土壤中AOB多样性指数最高.农田土壤中的amoA基因拷贝数最大,是底泥沉积物中的48倍.此外,RDA（Redundancy Analysis）分析表明,在沉积物和水陆交错带土壤中,AOB的优势种与NH₄⁺-N、NO₃^--N、TOC、pH成正相关关系,而在陆相土壤和农田土壤中,AOB的优势种与这些环境因子成负相关关系.其中,TOC是影响AOB的群落结构的关键理化因子.     

滇西北与滇东南干热河谷植物群落物种多样性研究

环境变迁下生物多样性格局形成及维持机制研究是生物多样性研究的核心科学问题之一. 滇西北和滇东南两地曾在地质历史上具有相似森林植被,随着板块运移,两地出现明显环境区化,植被类型亦产生巨大变化,仅在两地干热河谷生长着相似外貌和类型的植物群落,而其物种组成和生物多样性格局有何异同尚不清晰. 该研究分别在怒江和元江干热河谷设置100 km样带,每间隔4 km布设样地,对其植被进行群落学调查. 通过计算两地不同生活型植物重要值、Alpha及Beta多样性指标,拟阐明起源相近、外貌相似的两地植被在环境变迁后群落物种组成及生物多样性的变化规律. 结果表明:①滇西北干热河谷共调查到维管植物125种(51科104属),滇东南干热河谷共调查到114种维管植物(44科102属). 滇西北乔木和灌木物种丰富度均略高于滇东南,草本反之. 滇西北乔木多度极显著高于滇东南(P<0.01),灌木多度未出现显著性差异,草本多度滇东南显著高于滇西北(P<0.05). ②从科水平分析,滇西北和滇东南乔木和草本优势科组成种类相似,但灌木优势科组成种类差异性较大. 从种水平分析发现,两地乔木优势种种类差异较大,而灌木和草本组成相似. ③滇西北植物群落Shannon-Wiener指数、Simpson指数均略低于滇东南,但无显著性差异,而Pielou指数显著低于滇东南(P<0.05). 滇西北干热河谷植物群落中优势种单一,物种分布具有聚集性;滇东南植物群落物种分布较均匀,物种多样性丰富. ④两地植物群落之间相异性系数较高,处于极不相似水平,群落间生境差异性较大,不同生活型植物Beta多样性差异极显著(P<0.001),其中以灌木物种组成的相异性最大. 研究显示,起源相近、外貌相似的滇西北与滇东南干热河谷的植物群落物种组成存在明显差异,Alpha多样性差异不明显,Beta多样性存在显著性差异,环境变迁后区域环境差异改变了植物群落结构.      

Endemic pollinator response to organic vs. conventional farming and landscape context in the Cape Floristic Region biodiversity hotspot

The effects of organic management and landscape context on two highly endemic and important pollinator taxa (bees and monkey beetles) were studied in the Cape Floristic Region (CFR) biodiversity hotspot, where a quarter of the land is intensively managed mostly for grape production. This functional group was chosen as there is concern worldwide over pollinator decline, particularly in regions of high levels of endemism of both flora and fauna such as the CFR. Species richness and abundance of bees and monkey beetles were sampled and compared between organic and conventional vineyards, with natural vegetation as reference habitat. Species richness of monkey beetles, but not the species richness of bees, benefited from organic compared to conventional vineyard management. Our findings support the hypothesis that the effects of landscape context and management may be taxon dependent. Monkey beetles have been suggested as strong indicators of disturbance. These beetles are among the most important pollinator guilds in the CFR, as they help to sustain the endemic vegetation of this region. Protection of the remaining natural habitat in close proximity to farmland is an imperative conservation strategy in this region.     

Fractal properties of patch perimeters in a disturbed montane landscape, Beijing, China

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东苕溪鱼类生物完整性评价河流健康体系的构建与应用

以东苕溪流域为研究区域,建立基于鱼类生物完整性指数(IBI)的河流健康评价指标体系.采样点来自2个不同的生态区,共建立了2套不同的IBI评价指标体系和标准.上游支流样点均来自浙闽山地常绿阔叶林生态区,从而建立了东苕溪上游支流的IBI指标体系:即鱼类总物种数(M1)、平鳍鳅科鱼类物种数百分比(M5)、中国土著鱼类物种数百分比(M6)、Shannon-Wiener多样性指数(M7)、无脊椎动物食性鱼类个体百分比(M13)、植食性鱼类个体百分比(M14)、敏感性鱼类个体百分比(M1)7个参数指标.中下游样点均来自长江三角洲城镇及城郊农业生态区,建立了东苕溪中下游区域的IBI指标体系:即鱼类总物种数(M1)、虾虎鱼科鱼类物种数百分比(M4)、中国土著鱼类物种数百分比(M6)、Shannon-Wiener多样性指数(M7)、上层鱼类物种数百分比(M8)、中上层鱼类物种数百分比(M9)、植食性鱼类个体百分比(M14)、借助贝类产卵鱼类物种数百分比(M21)、鱼类总个体数(M22)、畸形、患病鱼类个体数百分比(M23)等10个参数指标.河流健康状态划分为5个健康等级:即“健康”、“一般”、“较差”、“极差”和“无鱼”.应用IBI指标体系评价东苕溪流域的45个观测点的河流健康状况,结果显示东苕溪流域绝大多数河段的健康状况处于“一般”和“较差”水平.2011年,东苕溪中下游河段的健康状态较2010年有所改善,然而上游支流的健康状态较2010年有所下降.     

增氧模式对水稻根际微生物多样性和群落结构的影响

为探讨不同增氧模式对水稻根际土壤微生物数量和群落结构的影响特征,以密阳46（MY）和珍汕97B （ZS）为材料,设置干湿交替（AWD）、长淹充氧（CFA）和长淹（CF）这3种根际氧处理模式,采用Illumina MiSeq高通量测序技术结合土壤理化性质,分析不同氧环境下水稻根际土壤细菌和真菌群落多样性特征及其与土壤理化因子的关系.结果表明,水稻根际土壤中细菌优势菌群为绿弯菌门（Chloroflexi）、放线菌门（Actinobacteriota）、酸杆菌门（Acidobacteriota）、变形菌门（Proteobacteria）和厚壁菌门（Firmicutes）;真菌优势菌群为子囊菌门（Ascomycota）和担子菌门（Basidiomycota）.不同增氧模式下水稻根际土壤微生物群落组成存在明显差异.各生育期,Chloroflexi和Acidobacteriota在AWD处理时,Actinobacteriota在CFA处理时的相对丰度高于其他处理;Firmicutes在AWD处理下相对丰度低于其他处理.增氧影响根际微生物物种多样性和丰富度.如AWD处理显著增加细菌物种多样性,降低其丰富度;AWD和CFA处理后真菌物种多样性和丰富度均显著增加.土壤理化性质也受增氧模式的影响.不同处理土壤氧化还原电位（Eh）大小表现为：AWD>CFA>CF,处理间差异达显著水平;与CF处理相比,增氧处理（AWD和CFA）显著增加根际土壤NO₃^--N含量,降低NH₄⁺-N含量.相关性分析表明,根际土壤pH和Eh与细菌物种多样性正相关,与丰富度负相关;与真菌物种多样性和丰富度正相关.冗余分析发现,全生育期的Chloroflexi相对丰度与pH和NH₄⁺-N均呈正相关;分蘖期和齐穗期的Chloroflexi相对丰度与Eh和NO₃^--N呈正相关,成熟期则负相关.pH和Eh与Acidobacteriota、Proteobacteria和Basidiomycota相对丰度正相关,与Firmicutes和Ascomycota相对丰度负相关.Ascomycota相对丰度与NO₃^--N负相关,与NH₄⁺-N正相关,Basidiomycota与之相反.综上,增氧模式改善根际土壤氧环境,改变土壤理化性质,影响微生物群落多样性和丰富度,从而优化微生物群落结构.     

科尔沁沙地不同沙漠化阶段植物种多样性与沙地草场地上生物量关系研究

论文从植被的种丰富度和功能多样性两个方面研究不同沙漠化阶段科尔沁沙地植物种多样性与沙地草场地上生物量的关系。相关分析表明,在科尔沁沙地不同沙漠化阶段,植物种多样性和沙地草场地上生物量的关系与多样性指数计算的基本单位有关。研究结果显示:①依据一年生、多年生和灌木等生活型为划分标准的功能多样性,在固定沙丘、半流动沙丘和流动沙丘阶段与沙地草场地上生物量的关系最密切,关联系数分别为-0.534、-0.574和-0.431。以豆科植物、C₃植物和C₄植物为划分标准的功能多样性,在半固定沙丘阶段与沙地草场地上生物量的关系最密切,关联系数为0.722。②在不同的沙漠化阶段,生活型多样性与地上生物量的关系呈负相关。说明在不同沙漠化程度的草场中,植物生活型组成的不均匀,有利于提高沙地草场地上生物量。③从不同生活型在各个沙漠化阶段中的种丰富度特征来看,一年生植物最高,多年生植物次之,灌木最低,平均值分别为9(±6.0)、3(±2.6)和1.8(±1.0),说明一年生植物在沙地植被组成中占主导地位。同时,研究结果表明,在不同沙漠化阶段中,以豆科植物、C₃植物和C₄植物划分的功能类型组的平均重要值以C₄植物最高,C₃植物次之,豆科最低,分别为48(±12.3)、39.7(±3.6)和12.3(±14.3),说明C₄类植物在科尔沁沙地植     

Diversity of cereal aphid parasitoids in simple and complex landscapes

Structurally complex landscapes may enhance local species richness and interactions, which is possibly due to a higher species pool in complex landscapes. This hypothesis was tested using cereal aphid parasitoids (Hymenoptera, Aphidiidae) by comparing 12 winter wheat fields in structurally complex landscapes (>50% semi-natural habitats; n = 6) and structurally simple landscapes dominated by agricultural lands (>80% arable land; n = 6). Surprisingly, landscape structural complexity had no effect on aphid parasitoid species diversity. In complex landscapes 12 and in simple landscapes 11 species were found; 9 species occurred in both landscape types. Hence, arable fields in high-intensity agricultural landscapes with little non-crop area can support a similar diversity of cereal aphid parasitoids as structurally complex landscapes. This finding suggests that cereal aphid parasitoids may find necessary resources even in simple landscapes, making generalisations concerning the relationship between landscape composition and biodiversity in arable fields difficult.     

How does agricultural intensification modulate changes in plant community composition?

Agricultural intensification, at local and landscape scales, has caused a decrease in plant diversity and changes in species composition in cereal fields. To better understand the role of landscape complexity and farming systems in shaping plant assemblages, it is of interest to focus on functional traits rather than on floristic composition, which may help to highlight trends in vegetation patterns. We analysed the relative abundance of various functional attributes (different life forms, growth forms, wind-pollinated species and wind-dispersed species) at three contrasted field positions (boundary, edge and centre) of 29 organic and 29 conventional cereal fields distributed in 15 agrarian localities of NE Spain. Agricultural intensification affected the biological attributes of the vegetation in dryland Mediterranean cereal fields; local factors (farming system and position) had a more prominent role in affecting plant functional composition than the surrounding landscape. Local factors were important for life form distribution, growth form and pollination type, whereas landscape complexity mainly affected the proportion of wind-dispersed species. Therefore, depending on the objective of the study, it is important to select functional attributes sensitive to the different scales of agricultural intensification, especially because landscape complexity and land-use intensity are commonly related.     

重庆市主城区景观格局演变的样带响应与驱动机制差异

为深入研究地形地貌和经济背景对快速城市化地区景观格局演变进程与时空差异的影响程度,以重庆市主城区为研究对象,借助于ArcGIS 9.3和Fragstats 4.2软件,采用样带梯度分析和景观格局分析相结合方法,基于研究区独特地貌特征和不同经济环境,设置南北向和东西向等7条样带,对1995-2014年研究区景观格局演变的样带响应和驱动机制进行对比分析。结果表明：1）就相同时期同向样带景观破碎度和景观多样性整体变化特征而言,靠近城市中心的南北向样带c和东西向样带f的斑块密度PD和香农多样性指数SHDI值分别呈最低值和最高值,远离城市中心的样带却恰好相反,可见各样带整体景观特征差异受同期城市化水平、地形因素、政策驱动影响明显;2）随着与城区中心（或丘陵、台地）距离的增加,南北向样带和东西向样带景观破碎度和景观多样性不断提高,景观聚集度却不断降低,斑块之间的连通性变差。2001年之后城市化对研究区景观格局影响程度增强,地形因素减弱,以耕地景观为主导的景观格局也逐步向以城市景观为优势的方向转变;3）在1995-2014年期间,南北向c样带南段18 km和东西向f样带西段8 km附近城乡居民点最大斑块指数LPI值均为最高,随城市向外蔓延,c样带北段6 km处LPI值出现100%,由于2001年之后老城区内部改造,南北向c样带南段18 km和东西向f样带西段8 km附近的面积加权平均斑块分维数AWMPFD也多由波峰值降为最低值（接近于1）,且城市化空间推进过程中不均匀性特征显著。     

随机森林算法在新疆物种丰富度影响因素研究中的应用

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