文献类型：期刊文献

中文题名：干旱和遮荫对马尾松幼苗瞬时水分利用效率及δ^(13)C的影响

英文题名：Effects of drought and shading on instantaneous water use efficiency andδ^(13)C of Pinus massoniana seedlings

作者：邓秀秀[1] 施征[2] 曾立雄[2] 雷蕾[2] 裴顺祥[1] 吴莎[1] 肖文发[2]

第一作者：邓秀秀

机构：[1]中国林业科学研究院华北林业实验中心,北京九龙山暖温带森林国家长期科研基地,北京102300;[2]中国林业科学研究院森林生态环境与自然保护研究所,国家林业和草原局森林生态环境重点实验室,北京100091

年份：2024

卷号：43

期号：1

起止页码：140-145

中文期刊名：生态学杂志

外文期刊名：Chinese Journal of Ecology

收录：CSTPCD;;Scopus;北大核心:【北大核心2023】；CSCD:【CSCD2023_2024】；

基金：国家重点研发计划项目(2016YFD0600201);中央级公益性科研院所基本科研业务费专项资金重点项目(CAFYBB2021QD002)资助。

语种：中文

中文关键词：干旱;遮荫;水分利用效率;δ^(13)C;马尾松幼苗

外文关键词：drought;shading;water use efficiency;δ^(13)C;Pinus massoniana seedling

分类号：S791.248

摘要：水分利用是植物光合固碳的关键过程,其效率反映植物对胁迫环境的适应能力,δ^(13)C作为反映植物长期水分利用效率的关键指标,对于揭示植物与环境长期作用的关系具有重要意义。本研究以马尾松幼苗为对象,通过土壤水分和光照条件控制,设置干旱(土壤水分为30%饱和含水量)、遮荫(光照强度为全光照的30%)及干旱+遮荫(土壤水分为30%饱和含水量和光照强度为全光照的30%)3种胁迫方式和对照(CK,土壤水分为70%饱和含水量和全光照),研究干旱和遮荫对马尾松瞬时水分利用效率和δ^(13)C的影响。结果表明:干旱和干旱+遮荫处理分别使马尾松当年生叶的瞬时水分利用效率显著增加了67.96%和60.78%,遮荫对瞬时水分利用效率的影响不显著;当年生叶的δ^(13)C在干旱处理下显著增加了14.35%,但在遮荫和干旱+遮荫处理下未发生明显改变;各处理对1年生叶δ^(13)C的影响均不显著;表明瞬时和长期水分利用效率的变化不同步,且马尾松的水分利用效率对干旱的响应较早;在各处理下,各库器官中的δ^(13)C均大于源叶,茎干和根中的δ^(13)C与源叶δ^(13)C的相关系数较大,且与1年生叶呈极显著正相关,各库器官的δ^(13)C主要受源叶δ^(13)C供应的影响。表明环境变化导致水分利用效率的变化将引起各库器官δ^(13)C发生改变。研究结果可为揭示马尾松幼苗对气候变化的响应机制提供参考。
Water use is a key process of photosynthetic carbon sequestration in plants.δ^(13)C is a key indicator for long-term water use efficiency(WUE),reflecting the adaptive ability of plants to stressful environments.It is thus of great significance to reveal the long-term relationship between plants and environment.In this study,we examined the effects of drought and shading on instantaneous WUE andδ^(13)C in Pinus massoniana seedlings under four treatments,including drought(30%saturated water content of soil moisture),shading(30%of full light intensity),drought+shading(30%saturated water content of soil moisture and 30%of full light intensity),and CK(70%saturated water content of soil moisture and full light intensity).The instantaneous WUE in the current-year needles significantly increased by 67.96%and 60.78%under drought and combined stress,respectively.δ^(13)C significantly increased by 14.35%under drought,but did not significantly change under shading and combined stress.However,theδ^(13)C values did not significantly change in the 1-year-old needles under three treatments.This indicated that the changes of instantaneous and long-term water use efficiency were not synchronized in P.massoniana,with WUE responded earlier to drought.Theδ^(13)C value in sink organs was higher than that in the source needles under all treatments.Moreover,δ^(13)C in stems and roots had significant correlation with that in needles,which was significantly positively correlated with that in 1-year-old needles.Theδ13 C value in sink organs was also mainly influenced by the supply of source needles.These results implied that the changes in WUE caused by changing environments could further affectδ^(13)C in each sink organ,which would provide a reference for the understanding the mechanism underlying the responses of P.massoniana seedlings to climate change.