真红树和半红树植物叶片性状的比较研究

红树植物是一类生长在热带、亚热带海岸潮间带的乔木、灌木或草本植物,根据其分布特征可分为真红树植物植物和半红树植物。为了探究两者对海岸潮间带高盐、高光和缺氧等环境的生态适应策略的异同,该文选取5种真红树植物植物[卤蕨(Acrostichum aureum)、木榄(Bruguiera gymnorrhiza)、老鼠簕(Acanthus ilicifolius)、桐花树(Aegiceras corniculatum)、秋茄(Kandelia candel)]和4种半红树植物[银叶树(Heritiera littoralis)、水黄皮(Pongamia pinnata)、黄槿(Hibiscus tiliaceus)、杨叶肖槿(Thespesia populnea)]为研究对象,对叶片解剖和功能性状进行了对比研究。结果表明:(1)9种红树植物叶片的共同特征表现为均具有角质层、叶肉具有栅栏组织和海绵组织分化、气孔下陷等。(2)不同之处在于真红树植物植物叶片有蜡质层和内皮层、无表皮毛、气孔仅分布在下表皮,而半红树植物的叶片则较少有蜡质层,部分有表皮毛,无内皮层,气孔在上下表皮分布不完全一致。(3)真红树植物植物的气孔密度和比叶面积显著小于半红树植物(P<0.05),而叶片厚度、含水量、比叶重和鲜干重比则显著大于半红树植物(P<0.05)。以上结果说明真红树植物植物的叶片性状使其在维持盐度平衡及贮水保水能力方面强于半红树植物,从而能更好地适应海岸潮间带高盐环境。     

Trade-offs between plant leaf hydraulic and economic traits

Leaf is the most important organ for carbon-water coupling of a plant because it is the primary medium for photosynthesis. It also acts as the hydraulic bottleneck and safety valve against hydraulic catastrophic dysfunctions. The leaf economics spectrum, which reflects the balance between investments and returns of leaf economic traits, provides a useful framework for examining species strategies as shaped by their evolutionary history. Changes in leaf hydraulic traits will influence leaf economic traits as well as plant survival and growth. Exploring trade-offs between leaf hydraulic and economic traits is thus of significance for modeling carbon-water relations, understanding the mechanisms of water/carbon investments, and extending the leaf economic spectrum. In this review, we first examined the trade-offs between leaf hydraulic and economic traits. Specially, we analyzed the relationships between leaf hydraulic conductivity and hydraulic vulnerability, water potential at the turgor loss point, water capacitance, safety margin, and leaf morphological, structural and functional traits. We then discussed potential mechanisms regulating leaf hydraulic and economic traits from leaf morphology, anatomy, venation, and stomatal functions. Finally, we proposed future research to: (1) develop an integrated whole-plant economics spectrum, including carbon-nitrogen-water resources and root-stem-leaf hydraulic transport system that will help revealing ecophysiological mechanisms of plant structure-functional coupling, carbon sequestration and water use; (2) explore a generalized trade-offs among leaf hydraulic safety, hydraulic efficiency and carbon fixation efficiency to advance our understanding of the relationships between biophysical structure and physiological metabolism in plant leaf construction under drought stress; and (3) explore the carbon-water metabolic relationship and coupling of water transport and growth rate for the metabolic theory and predictions at community scale.     

植物叶片水力与经济性状权衡关系的研究进展

叶片既是植物光合产物形成的主要场所, 又是整株植物的水力瓶颈、应对灾难性水力失调的安全阀门, 是植物碳水耦合权衡的重要器官。叶经济型谱反映了叶片经济性状“投资-收益”的权衡, 为验证植物进化过程中形成的物种对策提供了适用的理论框架。叶片水力性状变化会影响叶片经济性状及植物存活和生长。因此, 探索植物叶片水力与经济性状的权衡关系, 对建立植物碳-水耦合模型、揭示植物水-碳投资机理、扩展植物性状型谱等均有重要意义。该文首先综述了叶片水力性状、经济性状及两者之间的权衡关系, 分析了叶片导水率与水力脆弱性、失膨点水势、水容、安全阈值等水力性状以及与叶片的形态、结构和气体交换功能性状之间的关系。然后, 从叶片形态、解剖和叶脉网络结构以及气孔功能方面探讨了叶片水力性状与经济性状的调节机制。最后, 提出今后应加强三方面的研究: (1)探索建立植物根-茎-叶水力输导系统的碳-氮-水资源的整株经济型谱, 以揭示植物功能结构耦合、高效固碳用水的生理生态学机制; (2)探索叶片水力安全、水力效率和固碳效率之间的普适性权衡关系, 以深入理解抗旱植物叶片构建的生物物理结构与生理代谢的关系; (3)探索个体水平碳水代谢关系、水分运输与生长速率的耦合, 为代谢推演理论和植物群落尺度预测提供基础。     

红树植物功能性状对盐和铜胁迫的响应

目前,室内通过人工控制方式开展红树林对环境胁迫的响应研究,忽视了不同红树植物物种的生长习性,且以单一胁迫为主。通过野外生长与人工控制相结合方式,研究5个时期(2018.6-2020.8)盐和铜胁迫对3种红树植物(秋茄、拉关木和木榄)11种功能性状的影响,使用单因素和双因素方差分析研究不同时期不同树种下盐和铜胁迫对叶片功能性状的影响,回答红树植物功能性状对盐和铜单一及复合胁迫响应的科学问题。结果表明,不同时期下,三种红树植物功能性状具有明显差异。随着时间增长,三种植物的碳含量和冠层高度均呈升高趋势,其他功能性状因物种不同而表现出不同趋势;与乡土红树植物(秋茄和木榄)相比,外来入侵物种(拉关木)具有更快的生长速度。不同时期下,拉关木比秋茄和木榄具有更好耐盐性,三个物种的植物生长发育对铜胁迫的响应均不敏感。大部分时期下,单一盐胁迫对拉关木的植物功能性状无显著影响(P < 0.05),对秋茄和木榄的碳含量、冠层高度和比叶面积有显著影响(P < 0.05);单一铜胁迫对三个物种的绝大多数功能性状无显著影响。另外,盐-铜复合胁迫对秋茄叶片碳、磷、氮磷比及冠层高度有显著影响(P < 0.05),对拉关木叶片碳、铜含量、冠层高度、比叶面积有显著影响(P < 0.05),仅对木榄SPAD值有显著影响(P < 0.05)。在红树林保护修复工作中,研究成果可为红树林退化原因和机理阐释、红树林生长监测评估、生境治理以及树种选择提供一定的理论依据。     

石斛属植物叶片生物量与叶片养分含量间的关联进化

叶片生物量和元素含量是显著影响叶片生理功能的两类重要的叶片经济性状, 且二者紧密相关。然而过去的研究多数关注C、N和P三种元素含量, 而对其他元素含量关注较少。维管附生植物不能直接从土壤中吸收养分而经常遭受养分胁迫, 养分含量与生物量之间的协同关系在这类植物中表现得尤为突出。选择维管附生石斛属植物为研究对象, 应用系统发育独立对比分析, 检测了叶片生物量和元素含量的系统发育保守性以及这些性状间的关联进化。结果表明, 叶片干物质含量、比叶重、C含量、N含量、P含量以及C/N具有较强的系统发育信号, 并且叶片干物质含量和比叶重与这四个元素含量性状间存在较强的关联进化。另外, 经系统发育校准后, Ca含量和Mg含量间存在显著正相关; P含量与Si含量间存在显著正相关; Zn含量与N含量、N/P以及Mn含量间存在显著正相关, 而与C/N间存在显著负相关。结果为探讨维管附生植物叶片生物量和元素含量的主要影响因素, 以及从进化角度探讨二者在植物进化适应过程中的生态协同功能提供案例, 对进一步了解维管附生植物的功能适应性具有重要意义。     

Lower marine fungi (labyrinthulomycetes) and the decay of mangrove leaf litter

This paper deals with the association of members of the Labyrinthulomycetes (Thraustochytriales and Labyrinthulales) with decaying or decayed leaves at an intertidal mangrove at Morib, Malaysia. Representatives of both orders of these obligately marine unicellular eukaryotes of unresolved taxonomic affinities (Chamberlain & Moss, 1998) were consistently isolated from leaves at all stages of decay from the recently fallen to those in an advanced stage of decay, but not from either green or senescent yellow leaves attached to trees. Baiting experiments using -irradiated leaf discs of Sonneratia and Rhizophora spp. immersed in the aquatic environment of the mangrove, revealed that leaf material was colonised by both labyrinthulids and thraustochytrids within 24 hours of immersion at the test site and these organisms were isolated from the leaf material throughout the 14 day study period. In vitro experiments using axenic cultures of three thraustochytrid genera inoculated onto sterile discs of Sonneratia leaves and incubated for 14 days caused loss of both biomass and structural integrity of the leaf material. Freeze fracture, followed by scanning electron microscopy of leaves inoculated with a thraustochytrid and a strain of Labyrinthula, revealed that penetration of the leaf occured after 4 days and that the thraustochytrid was associated with localised degradation of internal leaf tissues. Cellulase production by an isolate of Schizochytrium aggregatum was detected. The results of all the above investigations are discussed with reference to the role of members of the Labyrinthulomycetes in nutrient cycling in the mangrove.     

八个树种叶水力性状对水分条件的响应及其驱动因素

树木叶片的水力效率和安全性会对水分条件的改变做出一定的响应, 进而影响树木的生长和分布, 然而叶导水率(K_leaf)和叶水力脆弱性(P₅₀)对不同水分条件的响应模式及其影响因素尚不清楚。该研究选取了晋西北关帝山和黑茶山两种水分条件下的8种树种, 测量其水力性状、叶片导管和形态性状, 比较两地不同树种的K_leaf和P₅₀的变化, 分析叶片水力效率和安全性之间的权衡关系, 并探讨叶片水力性状在不同树种及水分条件下的响应模式及其驱动因素。结果表明: 对同一树种而言, 湿润的关帝山叶最大导水率(K_max)和P₅₀均高于干旱的黑茶山; 对同一地区而言, 从在高水分条件下生长的树种到在易干旱环境生长的树种, K_max和P₅₀均逐渐下降。K_max、P₅₀、膨压丧失点水势(TLP)之间均存在显著相关关系。两地叶片P₅₀与导管密度、导管塌陷预测值((t/b)³)、叶片厚度、比叶质量显著正相关, 与导管直径、叶面积显著负相关, 不同树种的K_leaf和P₅₀与叶导管性状的关系大于叶形态性状。同一树种的关帝山到黑茶山P₅₀变化量(δP₅₀)与比叶质量和叶干物质含量在两地的变化量显著正相关, 同一树种δP₅₀与叶形态性状变化量的关系大于与叶导管性状的。以上结果表明: 随着水分条件变差, 叶片水力效率降低, 水力安全性提高, 不同树种叶片水力效率与安全性之间存在一定的权衡关系, 不同树种叶水力性状的差别受叶导管性状影响的程度大于受叶形态性状的影响, 同一树种叶水力安全性对水分条件变化的响应主要依靠叶形态性状的驱动, 树木在提高自身叶水力安全的同时增加了叶构建的碳投资。     

人工控制条件下9种园林植物叶功能性状对短期NO2污染的响应

叶功能性状能反映植物对环境变化的适应策略,利用开顶式熏气法,对9种常见园林植物进行为期20天的NO₂熏气实验,分析不同NO₂浓度熏气下叶片形态结构指标（单叶干重、单叶面积、比叶面积）、光合生理指标（光合速率、荧光参数）及化学性状指标（叶N含量、叶P含量、N：P比值）的差异,从而探讨以上植物叶性状对NO₂污染的短期响应。结果表明,不同植物叶性状对不同浓度NO₂污染的响应存在显著差异,即不同植物应对NO₂污染的适应策略不同,同种植物在不同浓度NO₂熏气下叶性状指标变化趋势相同,但变化幅度不同,可见同种植物对不同NO₂浓度的响应策略也存在差异;大部分叶性状指标间表现出显著的相关性,但叶N含量与比叶面积间未发现显著相关性,表明叶经济谱性状间权衡机制的稳定性在个体尺度上可能会发生改变。研究结果揭示了不同植物对NO₂污染的适应与响应差异,对预测城市NO₂污染可能带来的植物功能性状的协同进化以及植物生态策略的改变具有重要意义。     

广东电白人工红树林大型底栖动物群落的功能特征及其影响因子

随着人们对红树林生态价值的重视,近年来全球范围内陆续开展了红树林人工造林活动。以往对红树林造林成效的评价,主要集中在面积、成活率等数量指标上,很少针对红树林的生态功能进行评价。本研究对华南沿海水东湾人工红树林大型底栖动物群落的功能特征进行了调查,并分析其与环境参数的关联性。结果表明:通过1年的野外采样,共记录了5门6纲40种大型底栖动物,不同树种、林型的红树林中大型底栖动物群落的栖息密度、生物量以及功能多样性存在显著差异,无瓣海桑(Sonneratia apetala)人工林与白骨壤(Avicennia marina)天然林的生态功能较为接近。与拉关木(Laguncularia racemosa)人工纯林相比,人工混交林能满足更多功能特征底栖动物的生境利用需求。水土理化性质与某些大型底栖动物的功能性状存在显著的相关性,红树林定居后引起生境中环境参数的改变,是造成大型底栖动物群落多样化的主要原因。     

The leaf economics spectrum’s morning coffee: plant size-dependent changes in leaf traits and reproductive onset in a perennial tree crop

Background and AimsSize-dependent changes in plant traits are an important source of intraspecific trait variation. However, there are few studies that have tested if leaf trait co-variation and/or trade-offs follow a within-genotype leaf economics spectrum (LES) related to plant size and reproductive onset. To our knowledge, there are no studies on any plant species that have tested whether or not the shape of a within-genotype LES that describes how traits covary across whole plant sizes, is the same as the shape of a within-genotype LES that represents environmentally driven trait plasticity.MethodsWe quantified size-dependent variation in eight leaf traits in a single coffee genotype (Coffea arabica var. Caturra) in managed agroecosystems with different environmental conditions (light and fertilization treatments), and evaluated these patterns with respect to reproductive onset. We also evaluated if trait covariation along a within-genotype plant-size LES differed from a within-genotype environmental LES defined with trait data from coffee growing in different environmental conditions.Key ResultsLeaf economics traits related to resource acquisition – maximum photosynthetic rates (A) and mass-based leaf nitrogen (N) concentrations – declined linearly with plant size. Structural traits – leaf mass, leaf thickness, and leaf mass per unit area (LMA) – and leaf area increased with plant size beyond reproductive onset, then declined in larger plants. Three primary LES traits (mass-based A, leaf N and LMA) covaried across a within-genotype plant-size LES, with plants moving towards the ‘resource-conserving’ end of the LES as they grow larger; in coffee these patterns were nearly identical to a within-genotype environmental LES.ConclusionsOur results demonstrate that a plant-size LES exists within a single genotype. Our findings indicate that in managed agroecosystems where resource availability is high the role of reproductive onset in driving within-genotype trait variability, and the strength of covariation and trade-offs among LES traits, are less pronounced compared with plants in natural systems. The consistency in trait covariation in coffee along both plant-size and environmental LES axes indicates strong constraints on leaf form and function that exist within plant genotypes.     

Links between leaf anatomy and leaf mass per area of herbaceous species across slope aspects in an eastern Tibetan subalpine meadow

Leaf anatomy varies with abiotic factors and is an important trait for understanding plant adaptive responses to environmental conditions. Leaf mass per area (LMA) is a key morphological trait and is related to leaf performance, such as light‐saturated photosynthetic rate per leaf mass, leaf mechanical strength, and leaf lifespan. LMA is the multiplicative product of leaf thickness (LT) and leaf density (LD), both of which vary with leaf anatomy. Nevertheless, how LMA, LT, and LD covary with leaf anatomy is largely unexplored along natural environmental gradients. Slope aspect is a topographic factor that underlies variations in solar irradiation, air temperature, humidity, and soil fertility. In the present study, we examined (1) how leaf anatomy varies with different slope aspects and (2) how leaf anatomy is related to LMA, LD, and LT. Leaf anatomy was measured for 30 herbaceous species across three slope aspects (south‐, west‐, and north‐facing slopes; hereafter, SFS, WFS, and NFS, respectively) in an eastern Tibetan subalpine meadow. For 18 of the 30 species, LMA data were available from previous studies. LD was calculated as LMA divided by LT. Among the slope aspects, the dominant species on the SFS exhibited the highest LTs with the thickest spongy mesophyll layers. The thicker spongy mesophyll layer was related to a lower LD via larger intercellular airspaces. In contrast, LD was the highest on NFS among the slope aspects. LMA was not significantly different among the slope aspects because higher LTs on SFS were effectively offset by lower LDs. These results suggest that the relationships between leaf anatomy and LMA were different among the slope aspects. Mechanisms underlying the variations in leaf anatomy may include different solar radiation, air temperatures, soil water, and nutrient availabilities among the slope aspects.     

辽东栎(Quercus liaotungensis )叶特性沿海拔梯度的变化及其环境解释

植物对环境的适应一直是生态学研究的核心问题之一。山地由于海拔剧烈变化造成显著的环境差异,成为研究植物对环境适应性变化的理想对象。为阐明辽东栎（Quercus liaotungensis Koidz.）叶对环境的适应性变化,在北京东灵山地区辽东栎海拔分布范围（1000~1800m）内研究了叶特性的变化规律及其与地形和土壤养分的关系。回归分析发现：辽东栎气孔密度、气孔长度和叶面积随海拔的升高呈现曲线变化形式。在海拔约1400m处,气孔密度最小而气孔长度和叶面积最大;气孔密度和长度成反比;叶长宽比没有明显变化;叶绿素（a＋b）含量和单位干重叶氮、磷和钾含量沿海拔梯度呈上升趋势,同时叶绿素含量和叶氮含量有较弱的正相关。偏相关分析显示：叶绿素含量和坡位有显著的相关关系,叶磷含量与坡度关系显著,但叶养分与土壤养分之间未表现出明显的相关关系;地形和土壤养分与气孔密度、长度和叶面积等形态指标的关系均不显著。方差分析表明上坡位与中、下坡位的叶绿素含量有显著差异,上坡位的叶绿素含量最高。辽东栎大部分叶特性在其海拔分布范围内有显著的变化,并且形态特征和养分特征的变化形式不同,海拔1400m左右是辽东栎叶形态特征变化最显著的范围。这些叶特征的变化与土壤养分的关系不明显。     

三峡水库消落带植物叶片光合与营养性状特征

自2007年三峡大坝试运行以来,其独特的人工水位调度节律给当地的水库消落带生态系统带来了巨大的负面影响。植物功能性状可以反映某一特殊生境植物的生理生态过程特殊性,是指示生态系统结构与功能的有效指标。因此,在三峡水库消落带形成2a后,于2009年调查了消落带的42种适生植物以及对照带33种植物的6个叶片功能性状:最大净光合速率(Amax)、叶片气孔导度(Gs)、比叶重(LMA)、叶片全氮含量(Nmass)、全磷含量(Pmass)和全钾含量(Kmass)。运用标准化主轴回归分析对消落带植物叶片各功能性状之间关系进行分析,并对照全球尺度叶片功能性状数据库,旨在说明反季节淹水对消落带植物叶片功能性状之间关系与全球尺度对比发生了哪些变化。同时,运用成对方差t检验的分析方法,对比了在消落带和对照带都存在的33个种的叶片光合与营养性状之间的差异,以阐明消落带植物对消落带特殊生境的生理响应。结果表明:(1)消落带植物叶片各性状关系呈现出与全球尺度基本一致的格局,表现出植物叶性状之间关系的趋同性;(2)消落带植物Amass、Nmass、Pmass和Kmass显著高于全球尺度,而LMA则显著低于全球尺度。处于驯化阶段的消落带植物各叶片性状处在全球叶片经济型谱"低投入-快速回收"的一端。(3)消落带植物叶片Amass与对照带相比,有显著提高。表明三峡水库消落带植物叶片光合能力得到显著提高,这可能是其适应消落带特殊生境的关键生理生态对策之一。     

Strategies of leaf water uptake based on anatomical traits

• The ability of leaves to absorb fog water can positively contribute to the water and carbon balance of plants in montane ecosystems, especially in periods of soil water deficit. However, the ecophysiological traits and mechanisms responsible for variations in the speed and total water absorption capacity of leaves are still poorly known.
• This study investigated leaf anatomical attributes of seven species occurring in seasonal tropical high‐altitude ecosystems (rocky outcrop and forest), which could explain differences in leaf water uptake (LWU) capacities. We tested the hypothesis that different sets of anatomical leaf attributes will be more marked in plant individuals living under these contrasting environmental conditions. Anatomical variations will affect the initial rate of water absorption and the total storage capacity, resulting in different strategies for using the water supplied by fog events.
• Water absorption by leaves was inferred indirectly, based on leaf anatomical structure and visual observation of the main access routes (using an apoplastic marker), the diffusion of water through the cuticle, and non‐glandular or glandular trichomes in all species.
• The results suggest that three LWU strategies coexist in the species studied. The different anatomical patterns influenced the speed and maximum LWU capacity. The three LWU strategies can provide different adaptive advantages to adjust to temporal and spatial variations of water availability in these tropical high‐altitude environments.

     

基于多源遥感的红树林监测

红树林是生长在热带以及亚热带海岸潮间带上的生态群落, 其生产力高, 固碳能力强, 对保持海岸带生物多样性具有十分重要的价值。本文介绍了利用多源遥感数据监测红树林的一些主要研究内容, 分为3个方面: (1)在时空模式研究方面, 利用高空间分辨率影像像素和对象结合的方法对红树林树种进行分类以及利用Landsat影像对红树林进行动态变化监测并分析其驱动因素; (2)在结构参数研究方面, 利用无人机多光谱数据及地面激光雷达数据对红树林叶面积指数进行反演; (3)在生理生化参数研究方面, 探讨了红树林叶绿素含量对淹没状况的响应、互花米草(Spartina alterniflora)入侵是否影响红树林光能利用率, 以及光化学反射指数(photochemical reflectance index, PRI)与光能利用率(light use efficiency, LUE)的关系。上述系列研究为提取红树林相关信息要素时如何选择合适的分析方法提供了有力的参考, 强调了遥感在研究红树林时空模式, 提取结构参数和生物生化参数监测的有效性, 从而更好地促进红树林生态系统的生物多样性保育工作。     

辽东栎（Quercus liaotungensis ）叶特性沿海拔梯度的变化及其环境解释

植物对环境的适应一直是生态学研究的核心问题之一。山地由于海拔剧烈变化造成显著的环境差异,成为研究植物对环境适应性变化的理想对象。为阐明辽东栎(Quercus liaotungensis Koidz.)叶对环境的适应性变化,在北京东灵山地区辽东栎海拔分布范围(1000~1800 m)内研究了叶特性的变化规律及其与地形和土壤养分的关系。回归分析发现：辽东栎气孔密度、气孔长度和叶面积随海拔的升高呈现曲线变化形式。在海拔约1400m处,气孔密度最小而气孔长度和叶面积最大;气孔密度和长度成反比;叶长宽比没有明显变化;叶绿素(a+b)含量和单位干重叶氮、磷和钾含量沿海拔梯度呈上升趋势,同时叶绿素含量和叶氮含量有较弱的正相关。偏相关分析显示：叶绿素含量和坡位有显著的相关关系,叶磷含量与坡度关系显著,但叶养分与土壤养分之间未表现出明显的相关关系;地形和土壤养分与气孔密度、长度和叶面积等形态指标的关系均不显著。方差分析表明上坡位与中、下坡位的叶绿素含量有显著差异,上坡位的叶绿素含量最高。辽东栎大部分叶特性在其海拔分布范围内有显著的变化,并且形态特征和养分特征的变化形式不同,海拔1400 m左右是辽东栎叶形态特征变化最显著的范围。这些叶特征的变化与土壤养分的关系不明显。     

胡杨叶功能性状与土壤因子的关系

探究荒漠植物叶功能性状对土壤环境因子的响应格局,对理解干旱荒漠区优势植物适应干旱贫瘠逆境的权衡策略至关重要。以塔里木河干流上游胡杨为研究对象,研究不同生境胡杨叶功能性状变异格局及其与土壤因子的相互关系,以揭示胡杨适应干旱荒漠环境的生态策略。结果表明：(1)胡杨叶功能性状在不同地下水埋深(GWD, groundwater depth)之间差异显著(P<0.05),比叶面积(SLA, specific leaf area)、叶宽(LW, leaf width)、叶面积(LA, leaf area)随GWD增加而显著下降(P<0.05),叶长(LL, leaf length)、叶干物质含量(LDMC, leaf dry mass)、叶组织密度(LTD, leaf tissue density)则显著增大(P<0.05);其中LW、LA变异系数较高(48.6%、39.4%),对GWD变化较敏感。(2)浅GWD生境土壤有机碳(SOC, soil organic carbon)、全氮(TN, total nitrogen)、全磷含量(TP, total phosphorus)与氮...     

八种红树植物幼苗的叶片可溶性蛋白和抗氧化酶活性对光强的响应

红树林湿地生态系统的恢复与重建是我国南方海岸带生态恢复研究的重点领域之一。为明确红树植物光适应的生理生态策略，该文选取无瓣海桑(Sonneratia apetala)、秋茄(Kandelia obovata)、木榄(Bruguiera gymnorhiza)、桐花树(Aegiceras corniculatum)、老鼠簕(Acanthus ilicifolius)、卤蕨(Acrostichum aureum)、银叶树(Heritiera littoralis)和黄槿(Hibiscus tiliaceus)作为研究对象，通过遮荫控制试验，探究这8种红树植物一年生幼苗在不同光照强度(自然光强的100%、45%、30%、10%)处理下的叶片可溶性蛋白含量和抗氧化酶活性的响应特征。结果表明：(1)随光照强度下降，木榄、老鼠簕和卤蕨的叶片可溶性蛋白含量受到的影响较小，而无瓣海桑、秋茄、桐花树、银叶树和黄槿的叶片可溶性蛋白含量则表现出下降趋势。(2)木榄、老鼠簕和卤蕨的超氧化物歧化酶(SOD)和抗坏血酸过氧化物酶(APX)等抗氧化酶活性在10%光照强度处理下的活性与对照无显著差异，而无瓣海桑、秋茄...