Ground-active arthropod responses to rainfall-induced dune microhabitats in a desertified steppe ecosystem,China

Different microhabitats along dune slope were found to affect the distribution of plant performances and soil properties in desertified ecosystems. However, the ground-active arthropod responses to rainfall-induced dune microhabitats were largely unknown in desertified regions. At dune top, midslope and bottom, ground-active arthropods were sampled by the method of pitfall traps in addition to the herbaceous and soil measurements during spring, summer and autumn from 2012 to 2013. Ground-active arthropod had a strong dynamics in time, seasonally and yearly in responses to rainfall-induced dune microhabitats and the variations were significant higher than those of soil and herbaceous properties. The abundance distribution of dominant taxa （i.e. Melolonthidae, Carabidae, Glaphyridae, Tenebrionidae and Formicidae families） among dune microhabitats was similar between seasons within the same year, whereas they differed markedly between two sampling years with varying rainfall patterns. A significant （P〈0.05） difference in total abundance, taxa richness and Shannon index among dune microhabitats was found only in certain season time, particularly in 2013; however, no significant （P〉0.05） differences were found among dune microhabitats when averaged on three sampling seasons within the year of either 2012 or 2013. In all, the taxonomical structure differed considerably from the community structure in ground-active arthropod response to rainfall-induced dune microhabitats. The spatial distribution of taxonomical groups among dune microhabitats was significantly affected by inter-annual rainfall changes, whereas that of community structure was affected by both intra- and inter-annual rainfall changes in desertified ecosystems.

Micro-Arthropods in the Surroundings of Nests of Messor arenarius Ants in the Negev Desert in Israel

The present research investigated a segment of the micro-arthropod populations residing within nests of Messor arenarius ants in the Negev Desert of Israel. The total frequencies of micro-arthropods in the chaff of those ants’ nests were found to be higher than in the surrounding soil of the same nests. Acari (mites) were observed to be more abundant during the spring season, whereas their presence decreased during the summer months. Springtails (Collembola) were found to follow the Acari pattern, commonly found within the nests of those ants during spring but were absent during summer. Psocoptera order inhabiting soil habitats were infrequently encountered during spring, but their prevalence increased significantly during summer, particularly within the chaff of the ants’ nests, suggesting that chaff is their primary food source in the Negev Desert. Our research suggests that shifts in seasonality have important consequences on the distribution of soil invertebrate communities with implications on nutrient cycling.

Taxonomic and community composition of epigeal arthropods in monoculture and mixed tree species plantations in a deciduous forest of Ghana

Tropical forests provide several ecosystem services and functions and support approximately two-thirds of the world’s biodiversity but are seriously threatened by deforestation.Approaches to counteract this menace have revolved around aff orestation with several or a single tree species.We thus investigated how plantation forests with either a single or several tree species infl uenced arthropod taxonomic and community composition using pitfall traps to sample selected groups of epigeal arthropods(Araneae,Coleoptera,Orthoptera and Hymenoptera)and with environmental variables assessed simultaneously.Our results revealed 54 taxonomic groups with signifi cantly higher taxonomic richness,activity density,and diversity in the mixed stands than in the monoculture stands.The significant differences in community composition were mainly driven by families including Lycosidae,Formicidae,Staphylinidae,Scotylidae,Hydrophilidae,Gryllidae and Scarabaeidae and were explained by distinct habitat characteristics(canopy openness,litter depth,deadwood volume,and tree height).While the diverse tree communities and heterogeneous vegetation structure off ered food and habitat resources for diverse arthropod groups,the allelopathic nature coupled with homogenous stand characteristics of the Tectona grandis stands in the monoculture suppressed the growth of understorey vegetation that could otherwise serve as food and habitat resources for arthropods,which might have led to limited activities and diversity of arthropods in the monoculture plantation stands.The fi ndings thus highlight the need to promote mixed tree plantations in degraded tropical areas,especially when restoring biodiversity is the prime management focus.

腾格里沙漠东南缘人工固沙植被演替地面节肢动物群落多样性分布特征

在腾格里沙漠东南缘选取2、5、8、34 a和57 a的不同年限人工固沙植被区为研究样地,以流动沙地为对照,利用陷阱诱捕法调查了不同样地地面节肢动物的群落组成及多样性特征,阐明了固沙植被区地面节肢动物多样性对植被演替的响应规律。结果表明:(1)此次调查共获得地面节肢动物15685头,隶属于15目40科44个类群。随固沙年限的增加,地面节肢动物优势类群数基本无变化,常见类群数和稀有类群数分别增加了0.5—2.5倍和0.25—2.75倍;捕食性、植食性和杂食性地面节肢动物类群数均呈上升趋势,分别增加了0.5—3倍、0.2—4.2倍和0.3—1.67倍。(2)地面节肢动物总个体数表现为8 a和57 a固沙植被区显著高于流动沙地(P<0.05),分别是流沙地的3.85倍和3.03倍;类群数和多样性指数均表现为57 a和34 a固沙植被区显著高于其他年限固沙植被区(P<0.05),且57 a固沙植被区地面节肢动物类群数显著高于34 a固沙植被区(P<0.05)。(3)草本植物密度、土壤有机碳和灌木高度是影响固沙植被区地面节肢动物群落组成及多样性分布的主要因子,解释率分别为48.1%、25.2%和9.1%。草本密度、土壤有机碳与地面节肢动物个体数、类群数和多样性指数均呈显著正相关(P<0.05);灌木高度与地面节肢动物个体数呈显著正相关,与类群数和多样性指数呈显著负相关(P<0.05)。综上所述:地面节肢动物对固沙植被不同演替阶段环境条件的选择和适应性不同。流动沙地经人工固沙后,可以提高地面节肢动物的多样性,且34 a固沙时间是地面节肢动物多样性保持相对稳定的关键时间节点。

转Cry1Ah基因抗虫玉米HGK60对田间节肢动物多样性的影响

在常规作物中引入有益目的基因得到的转基因作物,可以为人类社会提供可持续的农业和经济效益,但其大面积种植可能带来的环境安全问题也得到了越来越多的关注。以转Cry1Ah基因玉米HGK60和对照常规玉米郑58为研究对象,采用直接观测法、陷阱调查法和扫网法,在2019—2021连续3年对苗期、喇叭口期、抽穗期和完熟期玉米田间节肢动物进行调查,分析其群落组成、生态指标、群落相似性及稳定性等。结果表明:(1)调查共获得124种48746个体,隶属于11目40科,除中性类群个体数在2019年抽穗期存在显著差异(P<0.05),HGK60与郑58在植食性、捕食性、寄生性以及中性4个类群的个体数量和种数没有显著差异(P>0.05),且不同类群的个体数和物种数在3年各生育期所占比重基本一致。(2)对丰富度指数、Shannon指数、优势度指数和均匀度指数的分析显示,HGK60和郑58在3年各生育期均未表现出显著差异(P>0.05),认为HGK60的种植对田间节肢动物各生态指标无显著影响。(3)从整体及各营养类群来看,HGK60与郑58相似系数较高,认为二者田间节肢动物群落组成相似。(4)HGK60种植对节肢动物群落的相对稳定性没有显著影响(P>0.05)。整体上,HGK60种植对田间节肢动物群落生物多样性的影响很小。研究结果为进一步研究转基因作物的环境风险提供了数据支撑。

滨海稻区节肢动物天敌种类调查分析

为明确滨海稻区天敌情况,2021~2023年,于滨海稻区调查了水稻节肢类捕食性天敌的种类,结果表明,滨海稻区共捕获水稻节肢类捕食性天敌57种,隶属5目,21科。其中蜘蛛目12科,43种;蜻蜓目1科,2种;脉翅目1科,3种;半翅目3科,3种;鞘翅目4科,7种,以期为稻田害虫生物防治提供科学数据。

江汉平原稻田主要害虫与天敌关系分析

【目的】本研究旨在调查分析江汉平原稻田节肢动物群落的物种组成以及主要害虫与天敌相互作用的关系,为制定水稻害虫绿色防控技术体系提供科学依据。【方法】2019-2020年通过吸虫器法和扫网法在水稻的分蘖期、孕穗期、齐穗期调查江汉平原监利市、潜江市、江陵县等市(县)28块稻田节肢动物物种种类与个体数量,采用主成分分析和灰色关联度分析法分析了各主成分对稻田节肢动物群落的影响以及主要害虫与天敌种群数量之间的关系。【结果】2019-2020年调查的江汉平原稻田节肢动物种类共169种,按照营养取食关系,将稻田节肢动物群落划分为4个亚群落,其中植食类6目33科57种,捕食类7目30科50种,寄生类2目15科44种,中性类5目16科18种。稻田节肢动物群落中对第1主成分贡献大的是白背飞虱Sogatella furcifera和黑尾叶蝉Nephotettix bipunctatus;对第2主成分贡献大的是淡翅小花蝽Orius tantillus和青翅蚁形隐翅虫Paederus fuscipes;对第3主成分贡献大的是稻纵卷叶螟Cnaphalocrocis medinalis和灰飞虱Laodelphax striatellus。与主要害虫稻纵卷叶螟种群数量关联度大的前3位天敌依次为:草间钻头蛛Hylyphantes graminicola>拟环纹豹蛛Pardosa pseudoannulata>三突花蛛Misumenops tricuspidatus。与主要害虫白背飞虱种群数量关联度大的前3位天敌依次为:华丽肖蛸Tetragnatha nitens>黑肩绿盲蝽Cyrtorhinus lividipennis>拟环纹豹蛛。【结论】稻田节肢动物群落构成差异主要是由优势植食性昆虫和优势捕食性天敌数量决定的。捕食动物草间钻头蛛种群数量与稻纵卷叶螟种群数量追随关系最为密切,对稻纵卷叶螟具有一定控制作用,华丽肖蛸的种群数量与白背飞虱种群数量追随关系最为密切,对白背飞虱具有一定控制作用。

猕猴桃园中6种植被生境节肢动物群落结构特征分析

为探究猕猴桃(Actinidia chinensis)园不同植被生境类型对节肢动物群落的影响.利用扫网和黄板诱集2种取样方法对猕猴桃园内鼠茅草(Vulpia myuros)、白三叶(Trifolium repens)、紫云英(Astragalus sinicus)、豌豆(Pisum sativum)、毛苕子(Vicia villosa)、百景一号(混播品种)6种生境中节肢动物种类和数量进行调查,并通过比较不同生境所得样本分析节肢动物群落的丰富度、多样性、相似性、均匀度等群落结构特征.此次调查共采集节肢动物136种共计5909头,分属2纲10目48科.综合评价各生境采集的个体数量,发现优势类群为昆虫纲(Insecta),半翅目(Hemiptera),盲蝽科(Mirada).不同生境中昆虫个体数量由多到少依次为百景一号>毛苕子>白三叶>鼠茅草>紫云英>豌豆;昆虫种类由多到少依次为百景一号>白三叶>鼠茅草>毛苕子>紫云英>豌豆.群落结构特征分析结果显示:各生境多样性指数H′值无显著性差异(P=0.357);紫云英与豌豆生境丰富度显著低于其他4种生境(P<0.001),大小依次为百景一号>白三叶>鼠茅草>毛苕子>紫云英>豌豆;均匀度指数J值无显著性差异(P=0.875).毛苕子生境与鼠茅草生境结构相似性系数为0.5625,呈中等相似.不同植被生境类型对猕猴桃园节肢动物群落结构组成有较明显影响,百景一号生境对昆虫群落数量和个体数量均最有利,且节肢动物多样性指数也最高.

Study on the Comparison of Arthropod Communities in Three Kinds of Cruciferous Vegetable Fields at High Mountainous Area

[Objective]This research aimed to compare arthropod communities in different cruciferous vegetable fields at high mountainous area and provide guidance for pest control. [Method] The main arthropod species in 3 kinds of erueiferous vegetable fields at high mountainous area were investigated, the composition of arthropod community in different vegetable fields were analyzed. [Result] The main arthropod species in erueiferous vegetables fields at high mountainous area were similar, but had different quantity compositions. The richness was the highest in radish field. [Conclusion] Crop species had great influence on biological community; we should focus on the main pests in the process of pest control.

祁连山国家公园煤矿修复对地表节肢动物多样性的影响

高寒山区煤矿覆土回填和种植草本植物能够快速改善环境,强烈影响地表节肢动物多样性及其生态功能,地表节肢动物对煤矿修复的响应还会因海拔及放牧扰动强度的变化而异。选择祁连山国家公园甘肃片区中部西营河和东大河保护站煤矿修复区和毗邻草地(对照区)为研究对象,利用陷阱法调查煤矿修复区及对照区地表节肢动物的种类组成和数量变化,解析地表节肢动物群落及关键类群对煤矿修复的响应模式,确定影响地表节肢动物多样性变化的关键要素。结果表明,煤矿修复缩小了修复区和对照区地表节肢动物群落差异,但煤矿修复区和对照区地表节肢动物群落组成明显不同并存在地域差异。西营河煤矿修复显著提高了地表节肢动物活动密度,而东大河保护站煤矿修复导致地表节肢动物活动密度略有降低,地表节肢动物类群丰富度、多样性和均匀度指数变化与活动密度相反。主要地表节肢动物科对煤矿矿区修复的响应模式不同并存在区域差异,西营河保护站煤矿修复显著提高了平腹蛛科、微蛛亚科和隐翅虫科的活动密度,但显著降低了硬体盲蛛科和象甲科的活动密度;东大河保护站煤矿修复显著提高了步甲科活动密度,但降低了蚁科和狼蛛科的活动密度。pRDA排序结果表明,海拔高度和全氮含量解释了西营河保护站煤矿修复区和对照区20.8%的地表节肢动物群落变异;草本地上生物量和海拔高度解释了东大河保护站煤矿修复区和对照区24.3%的地表节肢动物群落变异。总之,高寒山区人工覆土和植被建设引起的植被和土壤环境变化强烈影响地表节肢动物多样性,地表节肢动物对煤矿修复的响应存在明显的区域差异,地表节肢动物多样性可以指示和评估煤矿修复效果。

绿肥植物对咖啡园节肢动物功能团多样性的影响

为探讨绿肥植物对咖啡园节肢动物功能团多样性的影响,分别于2021年7月和11月采用目光搜寻法对常规种植(CK)、大翼豆种植(ML)、新诺顿豆种植(NW)3种类型咖啡园的节肢动物群落进行了调查,分析了各功能团的多样性和群落稳定性。结果表明:在常规种植咖啡园采集到节肢动物22种161头,大翼豆种植咖啡园采集节肢动物34种108头,新诺顿豆种植咖啡园采集节肢动物27种101头。绿肥种植模式咖啡园各功能团的Margalef、Shannon-Wiener、Pielou指数均高于常规种植咖啡园捕食性功能团的,而常规种植咖啡园天敌功能团的Simpson指数显著高于绿肥种植模式咖啡园各功能团的;绿肥种植模式咖啡园节肢动物群落的Ss/Si和Sa/Sp指数均高于常规种植咖啡园的。典型对应分析表明,绿肥种植模式咖啡园捕食性节肢动物的物种数和个体数更多;绿肥种植模式咖啡园节肢动物群落的稳定性更高,天敌与植食性害虫的相互制约关系更明显,更有利于有害生物的绿色防控。

天津武清区稻田节肢动物群落多样性

明确稻田节肢动物多样性,发挥自然生态系统对害虫的调控作用是制定水稻害虫生态控制策略前提和基础。本研究调查了天津市武清区稻田节肢动物群落多样性,采集了8 262个节肢动物样本,隶属3纲、12目、59科、127种。其中,害虫41种、中性节肢动物29种和天敌57种。其中天敌包括捕食性天敌49种及寄生性天敌8种。天津稻田节肢动物群落Shannon-Wiener多样性指数和Pielou均匀性指数分别为3.1513和0.6505,Simpson优势集中性指数为0.1193。天津稻田害虫优势种为灰飞虱Laodelphax striatellus,中性节肢动物以铜色长角沼蝇Sepedon aenescens数量最多,捕食性天敌主要有黄尾小蟌Agriocnemis pyqmaea、褐斑异痣蟌Ischnura sengalensis、黄蜻Pantala flavescens、圆尾肖蛸Tetragnatha vermiformis、锥腹肖蛸Tetragnatha maxillosa、异色瓢虫Harmonia axyridis等。寄生性天敌主要以黑腹单节螯蜂Haplogonatopus oratorius占优势,且在天津首次报道。本研究明确了天津武清稻田节肢动物群落的多样性,为开发应用天敌昆虫及害虫生态控制提供借鉴。

基于多功能耦合的潮汐流稻田湿地生态净化系统研究

构建了基于多功能耦合的潮汐流稻田湿地生态净化系统,处理罗氏沼虾陆基养殖尾水,研究水质净化效果、CH_(4)排放情况、稻田节肢动物多样性和水稻生长状况,并探讨潮汐流稻田湿地系统的综合效益.结果表明:潮汐流稻田湿地能够有效地净化陆基水产养殖尾水,对溶解性无机氮和总氮的平均去除率分别为54.3%和44.9%,对溶解性无机磷和总磷的平均去除率分别为42.9%和43.0%;潮汐流稻田湿地的CO_(2)和CH4排放通量与常规稻田相比分别减少了5.4%和92.5%;与处于淹水期的常规稻田相比,潮汐流稻田湿地的产甲烷功能基因mcrA基因丰度减少了82.3%;潮汐流稻田湿地提高了节肢动物多样性及其天敌的种类数以及天敌多度/害虫多度,抑制了害虫爆发,具有较好的综合效益.

思茅松林下黄精田节肢动物群落组成结构及多样性分析

【目的】研究思茅松林下黄精田节肢动物群落组成结构及多样性,为林下黄精上害虫的综合治理和天敌资源的保护利用提供参考。【方法】2022年1—12月,以云南省普洱市澜沧县大塘子村思茅松林下黄精种植基地为调查点,采用目测法、陷阱法、黄蓝板诱捕法、马氏网诱捕及夜晚踏查相结合的方法对思茅松林下黄精田节肢动物群落进行调查,并对节肢动物群落的多样性指数、优势集中性指数、均匀度指数和丰富度指数进行分析。【结果】在思茅松林下黄精田共采集到节肢动物7纲23目98科157属192种15423头,蜱螨目节肢动物为优势类群,其个体数有3899头,相对多度为25.28%。不同功能团类群中,在个体数上表现为害虫亚群落>中性节肢动物亚群落>天敌亚群落,害虫亚群落的个体数占节肢动物群落物种个体总数的51.41%。林下黄精田节肢动物群落多样性指数、优势集中性指数、均匀度指数和丰富度指数分别为3.488、0.095、0.663和19.806。林下黄精田主要害虫有红叶螨(Tetranychus pueraricola)、黄蓟马(Thrips flavus)、螽斯类和叶蝉类等;其中,红叶螨发生期为8—12月,9月为暴发期;黄蓟马主要发生在3—6月,4月为暴发期;主要天敌为姬蜂类、茧蜂类和蜘蛛类,姬蜂类和蜘蛛类均在5月种群数量最高。【结论】云南省普洱市澜沧县思茅松林下黄精田节肢动物群落多样性丰富。应加强对红叶螨等优势害虫的监测和防控,同时加强对寄生蜂类和蜘蛛类等天敌资源的保护和利用。

基于改进YOLOv4-tiny的节肢动物目标检测模型

针对自然环境下节肢动物背景复杂、形态万千、遮挡目标和目标尺度多样等因素,导致模型检测效率不高、边界框定位不准确的情况,提出一种基于改进YOLOv4-tiny的节肢动物目标检测模型。首先,结合空间、通道卷积注意力机制(CBAM),抑制背景噪声;其次,引入可变形卷积(DCN)以及改进的加权双向特征金字塔,重塑卷积和特征融合方式进行多尺度预测;最后,在FPN网络中引出一层Feat@3,嵌入空间金字塔池化结构,有效提取节肢动物的各种显著特征,使模型泛化能力更强,将改进后的模型命名为YOLOv4-tiny-ATO。实验结果表明,该模型在大小仅为54.6 Mb的前提下,很好地平衡了检测速度和检测精度,检测精度为0.725,检测速度达到89.6帧·s-1,召回率为0.585,较改进前相比YOLOv4-tiny模型,检测精度提高0.426,模型在模型大小、检测速度上更适用于移动端部署,模型检测精度也能达到应用标准,满足对节肢动物的检测需求。

不同品系黑老虎田间节肢动物的群落结构与多样性

为探究不同品系黑老虎田间节肢动物群落的结构和多样性,本研究以黑老虎虎绿1号、粉红1号和紫黑1号3个品系为研究对象,采用网捕、糖醋液诱集和黄、蓝板诱集等方法,于2021年对林下药用植物应用技术湖南省工程研究中心黑老虎科研示范基地田间节肢动物进行了系统调查,调查期间共收集到节肢动物6441头,隶属于4纲15目54科67种。研究结果表明,尽管不同品系黑老虎田间节肢动物各类群多样性表现不一,但差异不显著;不同品系黑老虎田间节肢动物群落的多样性指数与节肢动物总类群的变化基本一致;黑老虎田间节肢动物群落以害虫为主导,其变化趋势决定了黑老虎田间整个节肢动物群落的变化趋势,而天敌昆虫有紧随其后伴随害虫的变化而变化的现象。黑老虎田间节肢动物群落结构总体较为稳定,不同品系黑老虎田间节肢动物群落在同一地域、同一时期、相同生长环境下差异不明显。

烟田节肢动物群落生态学研究进展

本研究旨在探讨生态系统中节肢动物群落的组成结构与多样性,这对于了解节肢动物群落的生态功能至关重要。烟田作为一种特殊的农田生态系统,其生物多样性和群落结构对农业生态系统的可持续发展具有显著影响。研究首先报告了烟田节肢动物群落组成的现状,包括中国不同烟区优势害虫和天敌的组成情况、动态、多样性及其测度方法;其次,对烟田节肢动物群落多样性的影响因素进行概述,如农业栽培管理措施、化学药剂使用、有机农业和生物防治等这些因素对烟田节肢动物群落的物种多样性和丰富度产生直接或间接的影响。最后,分析了当前研究中存在的问题和挑战,讨论了DNA条形码技术和人工智能在节肢动物种类快速准确鉴定中的应用,并展望了使用无人机高光谱影像实时动态测量等技术在节肢动物多样性调查中的未来应用。通过对烟田节肢动物群落生态学的综合分析和总结,为烟田生态系统的保护和管理提供科学依据和指导。

武汉地区砂梨园节肢动物识别图谱及两种主要发生害虫概况

【目的】为了解武汉地区砂梨园区中节肢动物的发生危害情况。【方法】采用人工鉴定的方式鉴别节肢动物所属类别,并将其取样拍照制成图谱。【结果】共调查到节肢动物种类有11目43科74种,两种主要发生害虫分别是梨瘿蚊和梨小食心虫,梨瘿蚊一年有3次发生高峰,分别在4月上旬、5月上旬和6月上旬,梨小食心虫一年有4次发生高峰,分别在5月下旬、6月下旬、8月中旬、9月中旬。【结论】武汉地区砂梨园区中节肢动物发生种类丰富,梨瘿蚊和梨小食心虫2种主要害虫是当地监测和防控的主要对象,应选用化学药剂或综合应用措施进行防治。

沼液替代化肥对冬小麦田节肢动物群落结构与小麦产量的影响

为了研究等氮条件下沼液按不同比例替代化肥对冬小麦产量和麦田节肢动物群落结构的影响,2021—2022年在安徽农业大学农萃园设置大田试验,试验共设置5个处理:单施化肥、沼液替代20%、50%、80%和100%化肥,分别分析小麦产量和三类节肢动物的变化。结果显示:随着沼液替代化肥量的增多,害虫数量呈现减少趋势,天敌数量呈现先增后减的趋势。当沼液替代20%化肥时,土壤节肢动物密度最高。当沼液替代50%化肥时,多样性指数、均匀度指数以及天敌优势集中性指数最高。当沼液替代化肥达50%及以上时,小麦各产量指标均显著低于单施化肥。结论表明改厕沼液替代化肥比例宜控制在50%到20%之间,可为改厕沼液科学比例替代化肥提供理论参考。

Litter quality and decomposer complexity co-drive effect of drought on decomposition

Litter decomposition is key to ecosystem carbon(C)and nutrient cycling,but this process is anticipated to weaken due to projected more extensive and prolonged drought.Yet how litter quality and decomposer community complexity regulate decomposition in response to drought is less understood.Here,in a five-year manipulative drought experiment in a Masson pine forest,leaf litter from four subtropical tree species(Quercus griffthii Hook.f.&Thomson ex Miq.,Acacia mangium Willd.,Pinus massoniana Lamb.,Castanopsis hystrix Miq.)representing different qualities was decomposed for 350 d in litterbags of three different mesh sizes(i.e.,0.05,1,and 5 mm),respectively,under natural conditions and a 50%throughfall rain exclusion treatment.Litterbags of increasing mesh sizes discriminate decomposer communities(i.e.,microorganisms,microorganisms and mesofauna,microorganisms and meso-and macrofauna)that access the litter and represent an increasing complexity.The amount of litter C and nitrogen(N)loss,and changes in their ratio(C/N_(loss)),as well as small and medium-sized decomposers including microorganisms,nematodes,and arthropods,were investigated.We found that drought did not affect C and N loss but decreased C/N_(loss)(i.e.,decomposer N use efficiency)of leaf litter irrespective of litter quality and decomposer complexity.However,changes in the C/N_(loss)and the drought effect on C loss were both dependent on litter quality,while drought and decomposer complexity interactively affected litter C and N loss.Increasing decomposer community complexity enhanced litter decomposition and allowing additional access of meso-and macro-fauna to litterbags mitigated the negative drought effect on the microbial-driven decomposition.Furthermore,both the increased diversity and altered trophic structure of nematode due to drought contributed to the mitigation effects via cascading interactions.Our results show that litter quality and soil decomposer community complexity co-drive the effect of drought on litter decomposition.This experimental finding provides a new insight into the mechanisms controlling forest floor C and nutrient cycling under future global change scenarios.