文献类型：期刊文献

中文题名：锐齿栎幼苗生长、光合作用和非结构性碳对遮阴和模拟光斑的响应

英文题名：Responses of growth,photosynthesis and nonstructural carbohydrate of Quercus aliena var. acuteserrata seedlings to shading and simulated sunfleck

作者：陈志成[1] 刘晓静[2,3] 刘畅[4] 万贤崇[1]

第一作者：陈志成

机构：[1]中国林业科学研究院林业新技术研究所;[2]河南宝天曼国家级自然保护区管理局;[3]国家林业局宝天曼森林生态定位研究站;[4]中国林业科学研究院资源管护处

年份：2017

卷号：36

期号：4

起止页码：935-943

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2014】；CSCD:【CSCD2017_2018】；

基金：国家自然科学基金项目(31290223)资助

语种：中文

中文关键词：森林演替;碳饥饿;非气孔限制;树木死亡;遮阴忍耐;碳平衡

外文关键词：forest succession ; carbon starvation ; non-stomatal limitation ; tree mortality ; shadetolerance ; carbon balance.

分类号：S512.1

摘要：近年发现宝天曼锐齿栎(Quercus aliena var.acuteserrata)成熟林难以更新,通过对锐齿栎幼苗不同遮阴处理下生长、非结构性碳(NSC)和光合作用进行研究,为理解宝天曼锐齿栎树种的更新困难和加强锐齿栎林的科学抚育提供理论依据。本研究通过搭建遮阴棚对盆栽锐齿栎幼苗设置遮阴处理,并用中午开放遮阴网的方法模拟光斑,设置了对照(自然光照)、遮阴80%中午开放1 h(T80-1)、一直遮阴80%(T80)、遮阴98%中午开放1 h(T98-1)、一直遮阴98%(T98)5处理,测定了遮阴后锐齿栎幼苗的干物质量、比叶面积、NSC浓度、存活率、光合光响应曲线参数、光合日变化、荧光参数等指标。结果表明:遮阴处理的幼苗干物质量和NSC浓度都显著低于对照,模拟光斑处理使幼苗NSC浓度显著高于一直遮阴处理的幼苗;遮阴严重的T98处理使幼苗出现了较高的死亡率;在高光强下,T80、T98-1、T98的净光合速率(P_n)因非气孔限制显著低于对照;且T98的光化学反应能力最低;遮阴后锐齿栎幼苗表现出一定的遮阴适应性,如光饱和点(LCP)和暗呼吸速率(R_d)降低,T98的P_n高于T98-1。本研究证明,在严重遮阴环境下锐齿栎幼苗易因难以维持碳的收支平衡而死亡,但光斑缓解了遮阴对幼苗碳储备的不利影响,对塑造幼苗在高光照条件下的光合能力也有显著作用。
In recent years, it has been found that Quercus aliena var. acuteserrata mature forests in Baotianman Mountains in southwestern Henan Province in China are difficult to regenerate. This study aims to explore the reasons why Q. aliena could not well regenerate by investigating the effects of different light environments on photosynthetic characters and nonstructural carbohydrate （NSC） of Q. aliena seedlings, and to discuss the impact of sunfleck on Q. aliena regeneration. In this study, sunfleck was simulated by opening shading apparatus at noon every day. Five treatments were set up： control （CK, natural sunlight） and four shading treatments including shade by 80% with opening one hour at noon （T80-1）, shade by 80% （T80）, shade by 98% sunshine with opening one hour at noon （T98-1） and shade of 98% sunshine （T98）. Dry matter yield, NSC of Q. aliena seedlings, gas exchanges in photosynthetically active radiation （PAR） under 1500 μmol·m-2·s-1, photosynthesisPAR curves, diurnal variation of photosynthesis and chlorophyll fluorescence parameters of the leaves were measured. The dry matter yield and total NSC content of Q. aliena seedlings in shaded treatments were significantly lower than those of CK. The NSC content of seedlings under simulated sunfleck treatments was significantly higher than that of the seedlings with corresponding only shading treatments. Serious shading treatment （T98） resulted in higher death rate of seedlings. Different light environments had significant effects on photosynthetic capacity of Q. aliena seedlings. The net photosynthetic rates （Pn） of T80, T98-1 and T98 were significantly lower than CK under high PAR because of nonstomatal limitation in the shading treated seedlings. The efficiency of photochemical reaction of T98 was the lowest among all treatments. Q. aliena seedlings showed the ability of shade tolerance to some degree, such as lower light compensation point and dark respiration rate in shaded treatments, and T98 had higher Pn than T98-1. In summary, Q. aliena seedlings had difficulty to maintain the balance of carbon and to survive in seriously shading environment. However, sunfleck relieved the negative influences of carbon reserves of Q. aliena seedlings in shading environment, and had significant effects on building up high photosynthetic capacity of seedlings under high light conditions.