摘要
研究非生物环境条件如何影响植物间相互作用及其诱导的形态可塑性,有利于揭示喀斯特适生植物物种同时应对多种环境因素变异的策略。本研究以鬼针草(Bidens pilosa)和大叶醉鱼草(Buddleja davidii)为对象,分别在养分施加和不施加两种处理下,对植物进行单独生长(对照)、种内和种间相互作用3种处理,探讨养分可用性对种内、种间相互作用诱导的生物量和形态特征可塑性的影响。结果表明:不加养分处理中,鬼针草和大叶醉鱼草种内相互作用下的总生物量分别减少9.2%和14.4%,主要导致竞争效应,种间竞争不显著;加养分处理中种内促进作用占主导,二者分别增加35.1%和41.3%,大叶醉鱼草表现为种间促进作用,增加34.6%,鬼针草不显著。与对照相比,种内相互作用不加养分处理降低大叶醉鱼草根生物量和鬼针草的叶生物量,养分增加时提高大叶醉鱼草茎生物量,降低鬼针草比叶面积;种间相互作用不加养分处理提高大叶醉鱼草根冠比等特征,降低茎、叶生物量,增加鬼针草的茎生物量并减少其根生物量,加养时提高大叶醉鱼草根冠比和根生物量以及鬼针草的地径。这些结果说明,非生物环境条件可以通过影响种内与种间相互作用的强度而作用于植物的可塑响应。种内与种间相互作用诱导的可塑性之间的鲜明反差反映了两个物种生长和适应策略的显著差异:大叶醉鱼草和鬼针草分别是地下生长和地上生长占优势,种内相互作用分别导致更剧烈的地下竞争和地上竞争,而种间相互作用下二者可以避开各自的生长优势,实现资源利用的互补,因此竞争减弱,促进作用增强。这种策略有利于喀斯特生境适生植物物种在应对非生物环境挑战中更好地共存。
Investigating how nutrient conditions influence morphological plasticity induced by plantplant interactions can help reveal the adaptation strategies of karstadaptive plant species in coping with variations of environmental factors.In this study,we explored the effects of nutrient availability on the plasticity in biomass and morphological traits induced by intraspecific or interspecific interactions by treating Bidens pilosa and Buddleja davidii with and without intraspecific and interspecific interactions under two conditions of nutrient addition and no addition(control).In the nonutrient condition,the total biomass of B.pilosa and B.davidii under the intraspecific interaction decreased by 9.2%and 14.4%,respectively,which mainly resulted in competition effect,with little interspecific competition.When nutrients were added,intraspecific facilitative effect became dominant,increasing by 35.1%and 41.3%respectively.B.davidii showed interspecific facilitative effect,increasing by 34.6%,but not in B.pilosa.Compared to control,intraspecific interaction decreased root biomass of B.davidii and leaf biomass of B.pilosa in low nutrient conditions.When nutrients were added,it increased stem biomass of B.davidii and decreased specific leaf area of B.pilosa.By contrast,interspecific interaction increased root∶shoot ratio of B.davidii,decreased root biomass,and increased stem biomass for B.pilosa under low nutrient conditions.When nutrients were added,it increased root∶shoot ratio and root biomass for B.davidii,and increased ground diameter of B.pilosa.These results suggested that abiotic factors can affect the plastic response of plants through mediating the strength of intraspecific and interspecific interactions.The distinct contrast between trait plasticity induced by intraspecific and interspecific interactions reflected striking differences in growth and adaptation strategies between the two species,with belowground growth and aboveground growth being dominant for B.davidii and B.pilosa,respectively.Intraspecific interactions can lead to more intense belowground and aboveground competition for the two species,respectively.Under interspecific interactions,however,they may be able to avoid growth advantages,complementing each other in resource utilization,thus competition weakened and the facilitation pronounced.Such a strategy would be beneficial for the better coexistence of karstadaptive plant species in coping with the abiotic challenges.
作者
陈林丽
王姝
陈家兴
尹任娅
侯夏丽
杨庆祝
CHEN Linli;WANG Shu;CHEN Jiaxing;YIN Renya;HOU Xiali;YANG Qingzhu(Forest College,Guizhou University,Research Center of Forest Ecology,Guizhou University,Guiyan 550025,China)
出处
《生态学杂志》
CAS
CSCD
北大核心
2024年第3期773-782,共10页
Chinese Journal of Ecology
基金
国家自然科学基金项目(32171511)资助。
关键词
地上竞争
地下竞争
促进作用
表型可塑性
植物间相互作用
适应策略
aboveground competition
belowground competition
facilitative effect
phenotypic plasticity
plantplant interaction
adaptive strategy
