冰雪灾害后木荷倒木萌枝光合特性研究

李晓靖1; $21*; $21; $21; 2

引用本文:	李晓靖1，周本智1*，曹永慧1，洪奕丰1，2.冰雪灾害后木荷倒木萌枝光合特性研究[J].广西植物,2012,(1):83-89.[点击复制]
	LI Xiao Jing1， ZHOU Ben Zhi1*， CAO Yong Hui1， HONG Yi Feng1，2.Photosynthetic characteristics of resprouts on uprooted Schima superba after great ice storm[J].Guihaia,2012,(1):83-89.[点击复制]

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冰雪灾害后木荷倒木萌枝光合特性研究
李晓靖1，周本智1*，曹永慧1，洪奕丰1，2
1.中国林业科学研究院亚热带林业研究所，浙江富阳 311400;2.中南林业科技大学林业遥感信息工程研究中心，长沙 410004

摘要:

采用Li 6400型便携式光合测定仪，对冰雪灾害后夏季木荷倒木萌枝和未受损木荷枝条的叶片进行光合特性研究。结果表明：倒木萌枝和未受损木荷枝条的Pn、Tr和Gs日变化均呈双峰曲线，具有典型的光合“午休”现象，中午Pn降低均为气孔限制；未受损木荷Pn中午午休时间(10：00～15：00)长于倒木的午休时间(11：00～15：00)，其自我保护能力强于倒木，且对光适应的生态辐较宽；环境因子对Pn的直接作用由大到小为倒木：PAR＞Ca＞Ta＞RH，未受损木荷：Ta＞PAR＞Ca＞RH。倒木和未受损木荷的RH与Pn分别呈极显著(P＜001)和显著(P＜0.05)负相关，高温高湿、高湿分别是制约倒木、未受损木荷Pn进一步升高的主要环境因子。

关键词: 萌枝日变化光合效率环境因子冰雪灾害

DOI：

分类号:S795.7

基金项目:

Photosynthetic characteristics of resprouts on uprooted Schima superba after great ice storm

LI XiaoJing1， ZHOU BenZhi1*， CAO YongHui1， HONG YiFeng1，2

1.Institute of Subtropical Forestry， Chinese Academy of Forestry， Zhejiang Fuyang 311400， China;2.2.Research Center of Forest Remote Sensing and Information Engineering， Central South University of Forestry and Technology， Hunan Changsha 410004， China

Abstract:

The photosynthetic characteristics of uprooted and undamaged trees on Schima superba were measured in summer by Li 6400 portable photosynthesis system，and the data were analyzed to explore the diurnal variation of photosynthesis and its relationship with environmental factors. The results indicated that the diurnal variation of Pn，Tr and Gs showed a typical double peak curve with a midday depression of photosythesis，and the Pn reduction at noon originated from the co effects of stomata factor. The time of valley for undamaged trees(10：00-15：00)was longer than that of uprooted trees(11：00-15：00). The capacity ability of self protection and the ecological amplitude to light adaptation for uadamaged trees were higher and broader than those of uprooted trees. The direct impact of enviromental factors to Pn was the order of PAR＞Ca＞Ta＞RH for uprooted trees，Ta＞PAR＞Ca＞RH for undamaged trees. There was a significant negative relationship between RH and Pn on uprooted trees(P＜0.01)and undamaged trees(P＜0.05). High temperature and humidity were the most sensitive environmental factor effecting on the Pn of the uprooted trees. High humidity was the most important environmental factor influencing the Pn of the undamaged trees.

Key words: resprouts diurnal variation photosynthetic rate enviromental factors ice storm