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| 1 | UV-B has larger negative impacts on invasive populations of Triadica sebifera but ozone impacts do not vary显示文摘Aims Abiotic stresses may interact with each other to determine impacts on plants so that their combined impact is less than or more than additive.Increasing UV-B radiation and surface ozone(O3)are two major components of global change that may have such interactive impacts.Moreover,invasive and native populations of plants may respond differently to stresses as they can vary in primary and secondary metabolism.Methods Here,we conducted a factorial field experiment with open-top chambers assigned to an ozone treatment(ambient,100 ppb,or 150 ppb)and UV-B treatment(ambient or increased 20%).We grew seedlings of native and invasive populations of Triadica sebifera in these chambers for one growing season.Important Findings Invasive plants grew faster than native plants in ambient UV-B but they did not differ significantly in elevated UV-B.Litter production of invasive plants was especially sensitive to UV-B in a way that increased with UV-B for native plants but decreased for invasive plants which may be important for nutrient cycling.In ambient UV-B,total mass decreased as ozone increased.Total mass was lower with elevated UV-B but there was no additional impact of increasing ozone.Leaf area did not decrease with UV-B so SLA and LAR were lowest at ambient ozone levels.These results suggest that the effects of ozone will depend on UV-B conditions perhaps due to changes in foliar traits.The traits that allow invasive populations of plants to be successful invaders may make them especially sensitive to UV-B which may reduce their success in future climatic conditions. | Hong Wang Xiaochi Ma Ling Zhang Evan Siemann Jianwen Zou | 2016 | Journal of Plant Ecology2016，9，1： | 3 |
| 2 | Soil Respiration and Litter Decomposition Increased Following Perennial Forb Invasion into an Annual Grassland显示文摘Exotic plant invasions may alter ecosystem carbon processes, especially when native plants are displaced by plants of a different functional group. Forb invasions into grasslands are common, yet little is known about how they impact carbon cycling. We conducted a field study over 2 years from April 2010 to March 2012 in China to examine changes in soil respiration(R_(soil)) following invasion of exotic perennial forb species(Alternanthera philoxeroides or Solidago canadensis) into an annual grassland dominated by a native annual graminoid(Eragrostis pilosa). Measurements of R_(soil)were taken once a week in stands of the native annual graminoid or one of the forb species using static chamber-gas chromatograph method. Aboveground litterfall of each of the three focal species was collected biweekly and litter decomposition rates were measured in a 6-month litterbag experiment. The monthly average and annual cumulative R_(soil)increased following invasion by either forb species. The increases in cumulative R_(soil)were smaller with invasion of Solidago(36%)than Alternanthera(65%). Both invasive forbs were associated with higher litter quantity and quality(e.g., C:N ratio) than the native annual graminoid. Compared to the native annual graminoid, the invasive forbs Alternanthera(155%) and Solidago(361%) produced larger amounts of more rapidly decomposing litter, with the litter decay constant k being 3.8, 2.0 and 1.0 for Alternanthera, Solidago and Eragrostis, respectively. Functional groups of the invasive plants and the native plants they replaced appear to be useful predictors of directions of changes in R_(soil), but the magnitude of changes in R_(soil)seems to be sensitive to variations in invader functional traits. | ZHANG Ling MA Xiaochi WANG Hong LIU Shuwei Evan SIEMANN ZOU Jianwen | 2016 | Pedosphere2016，26，4： | 2 |
| 3 | The effects of elevated ozone and CO_(2) on growth and defense of native,exotic and invader trees显示文摘Aims Elevated ozone and CO_(2) can differentially affect the performance of plant species.Variation among native,exotic and invader spe-cies in their growth and defense responses to CO_(2) and ozone may shape CO_(2) and ozone effects on invasions,perhaps in part also due to variation between native and invasive populations of invaders.Methods We manipulated ozone(control or 100 ppb)and CO_(2)(ambient or 800 ppm)in a factorial greenhouse experiment in replicated cham-bers.We investigated growth and defense(tannins)of seedlings of Triadica sebifera from invasive(USA)and native(China)populations and pairs of US and China tree species within three genera(Celtis,Liquidambar and Platanus).Important Findings Overall,ozone reduced growth in ambient CO_(2) but elevated CO_(2) limited this effect.T.sebifera plants from invasive populations had higher growth than those from native populations in control con-ditions or the combination of elevated CO_(2) and ozone in which invasive populations had greater increases in growth.Their perfor-mances were similar in elevated CO_(2) because native populations were more responsive and their performances were similar with elevated ozone because invasive populations were more suscep-tible.Compared to other species,T.sebifera had high growth rates but low levels of tannin production that were insensitive to vari-ation in CO_(2) or ozone.Both China and US Platanus plants reduced tannins with increased CO_(2) and/or ozone and US Liquidambar plants increased tannins with the combination of elevated CO_(2) and ozone.The growth results suggest that intraspecific variation in T.sebifera will reduce the effects of CO_(2) or ozone alone on inva-sions but increase their combined effects.The tannin results suggest that defense responses to CO_(2) and ozone will be variable across native and exotic species.The effects of CO_(2) and ozone on growth and defense of native and exotic species indicate that the benefit or harm to species from these global change drivers is an idiosyncratic combination of species origin and genus. | Hong Wang Ling Zhang Xiaochi Ma Jianwen Zou Evan Siemann | 2018 | Journal of Plant Ecology2018，11，2： | 1 |
| 4 | Differences in seed properties and germination between native and introduced populations of Triadica sebifera显示文摘很多入侵植物的种子比原产地植物的种子萌发的更快,这可能有利于它们成功入侵。为了理解生物入侵过程,对入侵植物的入侵种群和原产地种群的种子特性和萌发特征同时进行评估极为必要。本研究中,我们以乌桕(Triadica sebifera)为研究对象探究种子萌发和种子特征的种内差异。我们利用采于2017年的乌桕种子,来自中国的12个原产地种群和美国的12个引入地种群,测定种子的物理性状(体积、重量、种皮硬度和种皮厚度)和化学特性[种仁的粗脂肪、可溶性蛋白质、糖、赤霉素(GA)和脱落酸(ABA)],并在中国的温室中测定种子的发芽率和萌发时间。此外,我们在美国用采自2016年和2017年的种子开展了研究地点(中国和美国)和种子采集年份(2016年和2017年)对种子萌发影响的比较实验。来自引入地的种子要比来自原产地的种子萌发更快。种子的物理和化学特性测定结果表明:与原产地种子相比,引入地种子更大、种仁内含有的赤霉素浓度以及GA:ABA比更高,但粗脂肪含量较低。种子重量、种皮硬度、种皮厚度、种仁脱落酸、可溶性蛋白质和糖含量在引入地和原产地之间没有显著差异。在中国和美国温室间的种子萌发率具有相关性,但种群的萌发率具有年际变化。我们的研究结果表明,体积较大和赤霉素含量较高的种子可能有助于快速萌发,这可能也有利于乌桕在引入地的入侵。 | Jialiang Zhang Evan Siemann Baoliang Tian Wei Huang Jianqing Ding | 2020 | Journal of Plant Ecology2020，13，1： | 1 |
| 5 | 外来入侵物种在青藏高原的入侵性和生态影响不一致显示文摘在全球变化背景下,管控入侵物种是一项具有挑战性的工作。这主要由于从入侵物种的入侵性推断它们的生态危害存在很大的不确定性。更确切地说,入侵性和生态危害的关系可能依赖于所研究的生态系统,同时这种关系还没有在像青藏高原这样独特的高寒生态系统中被研究过。在这项研究中,我们在青藏高原东南部的一个样带上调查了32种入侵植物。我们将这些入侵物种的生态危害分解为分布范围(R)、局部丰度(A)和个体对本地植物群落的影响(E)3个组分,并研究了植物性状对这些组分的相对贡献。研究结果表明,入侵植物的入侵性(R×A)和其所产生的危害(R×A×E)没有相关性。这表明这些入侵植物的入侵性不能反映它们对本地群落生态危害的严重性。在青藏高原,R和A共同驱动了入侵性,而R单独驱动了生态危害。植物性状并没有通过这3个组分驱动入侵性和生态危害,只有果实类型(主要是浆果)影响了E。我们的结果表明,驱动入侵性和生态危害的组分的不匹配导致了入侵植物的入侵性不能反映它们的生态危害。因此,关于入侵物种的管控应该优先考虑那些分布广泛的物种或者已经被证实会对本地物种产生负面影响的物种。 | Shuping Guan Pengdong Chen Xingle Qu Xiaolan Wang Shuopeng Wang Haiying Li Jiangping Fang Yi Wang Jiarui Chen Wei Huang Evan Siemann | 2023 | Journal of Plant Ecology2023，16，6： | 0 |
| 6 | Tallow tree allocates contrasting secondary chemicals in response to varying environments along elevational gradients显示文摘了解树木如何沿海拔梯度调节多种类型的次生代谢产物对于阐明植物如何采用生理和生态策略来应对各种生物及非生物环境变化至关重要。本研究旨在探索乌桕如何分配不同的次生代谢产物来响应海拔梯度上的环境变化。我们在中国沿海拔梯度对乌桕不同取食类型的植食性昆虫及其对乌桕叶片的危害率进行了野外实地调查,并对健康叶片和虫害叶片中的次生代谢产物(单宁和黄酮类)进行了测定分析。研究结果表明,乌桕叶片被危害(咀嚼或潜叶式危害)的可能性随海拔的升高而减小。遭受虫害叶片和未遭受虫害的健康叶片中黄酮类化合物的浓度随海拔梯度变化呈现相反的趋势,即随着海拔的升高,健康叶片和遭受虫害叶片受不同的生物和非生物因素驱动,健康叶片中黄酮类化合物浓度增加,而遭受虫害叶片中黄酮类化合物浓度下降,其中槲皮苷对黄酮类化合物随海拔梯度变化的贡献最大。单宁浓度随海拔梯度的变化未发生显著变化,高海拔地区乌桕健康叶片中单宁与黄酮类化合物的比例与低海拔相比相对较低。我们的研究揭示了沿海拔梯度昆虫植食性以及不同植物次生代谢产物的变化趋势,并强调了在理解植物的生理和生态策略中同时考虑多种次生代谢物质的重要性。 | Li Xiao Jialiang Zhang Wei Huang Juli Carrillo Evan Siemann Jianqing Ding | 2020 | Journal of Plant Ecology2020，13，3： | 0 |
| 7 | 凋落物年龄和氮、磷添加交互作用对杉木林土壤N_(2)O排放的影响显示文摘氧化亚氮(N_(2)O)是一种重要的温室气体,增温潜势较大,其浓度增加影响全球气候变化。由于凋落物分解影响碳和养分循环,土壤N_(2)O排放受凋落物分解作用,而凋落物年龄和氮、磷添加影响凋落物分解,潜在影响土壤N_(2)O的排放。然而,凋落物年龄和养分添加对土壤N_(2)O排放的交互作用及其机制目前还没有报道,这限制了凋落物分解对N_(2)O排放的影响评价。本研究以杉木(Cunninghamia lanceolata)不同年龄凋落物为研究对象,通过氮、磷添加处理,研究了养分和凋落物年龄对N_(2)O排放的影响及其机制。研究结果显示,幼龄凋落物主要通过调节碳氮比来影响N_(2)O排放。氮添加主要通过调节凋落物碳氮比、土壤pH以及与N_(2)O产生相关的微生物功能基因所编码的土壤酶活性来影响N_(2)O排放,整体上促进N_(2)O排放。磷添加显著降低凋落物碳氮比,进而作用于N_(2)O排放,该途径促进N_(2)O排放。同时,磷添加提高土壤有效磷水平,潜在降低N_(2)O排放,整体上降低土壤N_(2)O排放。凋落物年龄和养分添加交互作用于土壤N_(2)O排放。因此,在森林经营管理中,评价不同管理措施,尤其是间伐和选择性砍伐等导致不同凋落物输入的管理活动对土壤N_(2)O排放的影响时,应同时考虑养分输入和凋落物年龄的潜在影响。 | Shuli Wang Xi Yuan Ling Zhang Fusheng Chen Xiangmin Fang Xiaojun Liu Bangliang Deng Nasir Shad Wenyuan Zhang Xiaofei Hu Xiaomin Guo Evan Siemann | 2022 | Journal of Plant Ecology2022，15，4： | 0 |
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