Abstract: Soil fauna plays a crucial role in plant litter decomposition. However, if and how increasing nitrogen (N) deposition and plant functional type jointly affect the contribution of soil mesofauna to litter decomposition remains poorly understood. A litterbag experiment with two meshed sizes (0.1 and 2 mm) was conducted to examine the effects of soil mesofauna on litter decomposition of ...

Abstract: Projected changes in winter climate can have large implications for the functioning of terrestrial ecosystems. In particular, increased soil frost associated with reduced insulating snow cover can affect the structure and activity of soil microbial communities in cold ecosystems, but little known about the variability of these effects among the fractions of soil aggregates. We used a ...

Abstract: ​Information about the seasonal changes in soil enzyme activity along altitudinal gradients is key for understanding the responses of soil biochemical processes to ongoing climate change. Therefore, a 3-year in situ soil core incubation experiment was conducted along a 2431-m altitudinal gradient in an alpine-gorge region on the eastern Qinghai-Tibet Plateau, which includes dry valle...

AbstractAims The redistribution of forest gaps based on solar radiation and precipitation (mainly rainfall and snowfall) can create heterogenous microenvironments inside and outside the gaps. Here, we investigated the effects of forest gaps on carbon (C), nitrogen (N) and phosphorus (P) stoichiometry in decaying logs by altering the microenvironments. Methods Minjiang fir (Abies faxoniana) logs...

摘 要 生态化学计量是认识植物与环境间养分循环和物质流动的重要渠道，受不同立地因子调控. 为揭示不同立地和龄组对巨桉叶C、N、P含量及比值的影响并从化学计量角度筛选适宜巨桉人工林培育的优良立地类型，在四川省巨桉主要引种区选择了77个标准样地采集叶片分析其C、N、P含量及计量比. 结果显示，研究区样地可划分为2个小区4个组，6个亚组，17个立地类型. 四川省巨桉叶C、N和P含量分别为507.44 ± 23.14、11.08 ± 0.68和1.41 ± ...

Abstract​: Biodiversity loss likely occurs in alpine ecosystems under climate warming. However, little is known about the effect of plant functional type loss on the litter decomposition rate and microbial community composition. To test whether single functional type loss has a significant impact on the litter decomposition and microbial community composition, we conducted a litterbag exper...

AbstractBackground: The terminal branch orders of plant root systems are increasingly known as an ephemeral module. This concept is crucial to recognize belowground processes. However, it is unknown if root modules still exist after they die?Methods: The decomposition patterns of the first five root orders were observed for 3 years using a branch-order classification, a litter-bag method and se...

摘要：叶片的有机组分特征不仅是植物光合产物分配策略和养分回收的重要参数,而且是衡量凋落叶分解难易程度的重要指标.为探究不同植物群落叶片间有机组分的差异,以华西雨屏区人工林的优势乔,灌,草植物作为对象,收集其成熟叶及凋落叶,研究其水溶性组分(Water soluble component,WSC),有机溶性组分(Organic solvent soluble component,OSC),酸溶性组分(Acid-soluble extractive,ASE)和酸不溶性组分(Acid-insoluble residue,AIR)含...

摘要：土壤动物群落结构和多样性可能随凋落物分解进程和基质质量的变化不断改变。为了解亚热带森林凋落叶分解过程中土壤节肢动物群落变化特征，以四川盆地亚热带森林麻栎（Quercus acutissima）和柳杉（Cryptomeria fortunei）凋落叶为对象，于2011—2015年采用分解袋法研究了2种凋落叶分解过程中土壤节肢动物组成、结构和多样性动态变化。整个研究期间，柳杉和麻栎凋落叶分解袋中共捕获土壤节肢动物3855只，分属于16目51科，且...

AbstractBackground: Soil fungi play crucial roles in ecosystem functions. However, how snow cover change associated with winter warming affects soil fungal communities remains unclear in the Tibetan forest.Methods: We conducted a snow manipulation experiment to explore immediate and legacy effects of snow exclusion on soil fungal community diversity and composition in a spruce forest on the eas...

摘要：【目的】探讨川西高山峡谷区不同类型彩叶林生态系统的养分循环和系统稳定机制。【方法】采用野外调查与室内分析相结合的方法，研究了川西高山峡谷区不同类型彩叶林-针叶纯林（落叶松Larix gmelinii）、针阔混交林（糙皮桦Betulautilis-岷江冷杉Abies faxoniana和白桦Betula platyphylla-云杉Picea asperata-川滇长尾槭Acer caudatumvar. prattii）、阔叶纯林（橿子栎Quercus baronii）和阔叶混交林（亮叶桦Betula luminif...

Abstract: Walnut anthracnose is one of the most serious diseases of walnut globally. In this study, the pathogen was identified as Colletotrichum gloeosporioides by morphological and molecular approaches. Then, the resistance of 18 walnut genotypes was evaluated by field investigation as well as field and detached leaflet inoculation. A field inoculati​on assay was used as a benchmark for comp...

摘要：植物根系分解是养分元素进入土壤的重要途径之一。为了解径级对根系分解过程中养分元素释放的潜在影响，本研究以川西亚高山针叶林中的粗枝云杉（Picea asperata）为研究对象，采用原位分解试验，研究了云杉3个径级（0-2 mm，2-5 mm和5-10 mm）根系分解过程中钾（K）、钠（Na）、钙（Ca）和镁（Mg）元素浓度、残留率和释放率动态特征。结果表明：4种元素在冬季和生长季节释放模式不同，除Na和Ca外，其它2种元素冬季的释放率...

​Abstract: Pinus massoniana plantations have been established around the southern part of China to provide timber or fuelwood. In recent years, widely distributed monoculture P. massoniana forests have been transformed into mixed forests due to various ecological problems, such as the decrease in biodiversity in the forests and the lack of soil nutrients. However, how soil microbial diversity ...

​Abstract: Winter snowpack maintains a relatively warm environment for soil microorganisms and modulates soil biogeochemical cycles in cold ecosystems; however, snowpack reduction induced by climate warming may change soil dissolved nutrient leaching and microbial biomass. Here, we performed a snow depth manipulation experiment in an alpine forest on the eastern Tibetan Plateau. We assessed th...

Abstract: Walnut blight caused by Xanthomonas arboricola pv. juglandis (Xaj) is one of the most detrimental diseases affecting walnut quality and production. A screen of 18 walnut genotypes for leaf resistance to Xaj suggested species independent variation and revealed four highly resistant (HR) cultivars (‘96’, ‘91’, ‘Chuanzao2’ and ‘Qingxiang’), while ‘Yanyuanzao’ and ‘Xiangling’ ...

​Abstract: Plant litter-derived dissolved compounds leaching is an important process for soil carbon (C) sequestration and nutrient cycling. However, knowledge of the biotic and abiotic drivers of dissolved compound release from litter mixture remains limited. Here, we evaluated the loss of soluble C, N, and P during litter mixtures decomposition across an alpine treeline ecotone, and we sough...

摘要：【目的】评价不同核桃品种/无性系的炭疽病抗性强弱，探讨不同抗性材料受到炭疽病菌胁迫后的生理响应差异，为选育抗病品种提供理论依据。【方法】以18个核桃品种/无性系为材料，通过田间人工接种炭疽病菌鉴定其抗性强弱，测定炭疽病菌侵胁迫下不同抗性材料的过氧化物酶（POD）、多酚氧化酶（PPO）、超氧化物歧化酶（SOD）和几丁质酶活性及丙二醛（MDA）、脯氨酸和可溶性糖含量的差异。【结果】不同核桃品种/无性系间炭疽病...

摘要：为鉴定引起四川盆地地区核桃黑斑病的病原菌，采用组织分离法对病原菌进行分离，利用柯赫氏法则验证其致病性,依据菌株形态学和基于16S rDNA 基因序列分析对病原菌进行鉴定；同时，利用分离的菌株对18个栽培品种(无性系)进行抗病性评价。结果表明，分离菌株的菌落形态与黄单胞杆菌属(Xanthomonas)相似，其16S rDNA 序列与树生黄单胞杆菌(X. arboricola)的(登录号为KP340804.1)同源性高达99%，因此，将引起四川盆地地区核桃...

摘要：土壤微生物群落组成及酶活性是反映土壤肥力的重要指标，且与地貌特征和植被群落密切相关. 为了解岩溶断陷盆地典型植被下土壤生物特征，以云南建水县典型岩溶断陷盆地的4种植被类型—玉米、柑橘、石榴和马尾松为研究对象，采用磷脂脂肪酸生物标记法和酶标板法，对比分析不同植被类型土壤微生物群落和酶活性差异. 结果显示，相比3种人工种植植被，马尾松人工林土壤的有机质、全氮和全磷含量均相对较高. 4种植被土壤磷脂脂肪...

 Abstract: Soil fauna are crucial decomposers in terrestrial ecosystems, but how the role of soil fauna varies among climatic conditions and litter substrates remains poorly understood. Here, we conducted a four-year litter decomposition experiment along an elevational gradient (453 m, 945 m, 3058 m and 3582 m) in southwestern China. Two dominant tree species with contrasting leaf traits (conif...

摘要：丛枝菌根真菌（arbuscularmycorrhizal fungi, AMF）在森林土壤养分吸收和转化过程中具有十分重要的作用与地位，其群落结构对森林植被更新和演替敏感响应。为了解亚高山森林转换对AMF 多样性的影响，以川西亚高山岷江冷杉（Abiesfaxoniana）采伐后形成的次生林和粗枝云杉（Piceaasperate）人工林为对象，采用高通量测序法研究了2 种森林土壤有机层（半分解层和分解层）和矿质层AMF 组成和多样性的特征。结果表明：2 种森林...

Abstract: The decomposition of litter carbon (C) fraction is a major determinant of soil organic matter pool and nutrient cycling. However, knowledge of litter chemical traits regulate C fractions release is still relatively limited. A litterbag experiment was conducted using six plant functional litter types at two vegetation type (coniferous forest and alpine shrubland) in a treeline ecotone....