文献类型：期刊文献

中文题名：模拟干旱下毛竹叶片水势的动态变化

英文题名：The Dynamic Change of Leaf Water Potential for Moso Bamboo Under Throughfall Exclusion

作者：曹永慧[1] 周本智[1] 倪霞[1] 葛晓改[1] 王小明[1]

第一作者：曹永慧

机构：[1]中国林业科学研究院亚热带林业研究所,国家林业局钱江源森林生态系统定位观测研究站,浙江杭州311400

年份：2018

卷号：31

期号：4

起止页码：183-191

中文期刊名：林业科学研究

外文期刊名：Forest Research

收录：CSTPCD;;Scopus;北大核心:【北大核心2017】；CSCD:【CSCD2017_2018】；

基金：国家自然科学基金项目(31600503);中央级公益性科研院所基本科研业务费专项(RISF2013002);国家林业局“948”项目(20144-57);浙江酋自然科学基金项目(LYl3C160002)

语种：中文

中文关键词：毛竹;截雨干旱;叶片水势;生长季节;年龄;冠层高度

外文关键词：Phyllostachys edulis;throughfall exclusion;leaf water potential;growth period;age;canopy height

分类号：S718.43;S795.7

摘要：[目的]定量分析毛竹叶片凌晨水势随生长季节和竹龄的梯度变化趋势及其对截雨干旱的响应特征,阐明毛竹不同年龄个体水分供给关系的季节差异。[方法]通过人工截雨模拟干旱试验,采用PSYPRO水势测量系统动态监测毛竹叶片凌晨水势的变化。[结果](1)无论干旱与否,同一竹龄毛竹叶片凌晨水势在季节间差异较显著(P<0.05),而在竹龄之间无显著差异。(2)同龄毛竹叶片凌晨水势随生长季节变化呈现峰值,且因竹龄而异。自然生长(对照)1年生和7年生毛竹叶片凌晨水势随季节变化呈现"单峰"趋势,以9月份最高;2年生至5年生个体叶片凌晨水势随季节变化为"双峰"趋势,分别在9月份和12月份出现峰值。截雨干旱后,1年生和2年生毛竹叶片凌晨水势呈"双峰型",3年生至5年生随季节变化呈"单峰型"。叶片凌晨水势与土壤水分状况随季节变化趋势具有一致性。(3)截雨干旱与自然生长下毛竹叶片凌晨水势于不同生长季节随竹龄大小的变化趋势较为相似。干旱与否,在8月份至10月份生长旺盛期,叶片凌晨水势随着竹龄增加而下降,水分有从幼竹向老竹输送的趋势。12月份至翌年3月份孕笋期正好相反,随着竹龄增加其叶片凌晨水势增加,水分具有从老竹高水势向幼竹低水势输送的趋势。表明水分在毛竹不同竹龄个体之间输送补给方向因生长季节不同而存在差异。(4)在生长旺盛期,干旱处理毛竹叶片凌晨水势显著低于自然生长毛竹,且随着竹龄增加,水势差异幅度增大;在孕笋期,5年生以上老竹干旱后叶片凌晨水势低于对照毛竹。(5)不同生长季节不同冠层部位叶片凌晨水势存在差异,但均不显著,叶片凌晨水势随冠层分布趋势也受竹龄大小影响。[结论]同一竹龄毛竹叶片凌晨水势存在较显著的季节间差异,毛竹叶片凌晨水势与土壤水分状况的季节变化趋势一致。水分在毛竹不同竹龄个体之间输送方向因生长季节而异,表明水势是驱动毛竹适应干旱胁迫的重要因素。
[ Objective] The objective of this paper is to analyze quantitatively the leaf predawn water potential change with the growth season and age along canopy height for moso bamboo （Phyllostachys edulis） in natural and drought stress environment, and to clarify the seasonal differences of water supply for individuals of different ages of Ph. edulis, lay a theoretical basis for the sustainable and efficient management of Ph. edulis plantations in the glob- al climate background. [ Method ] The throughfall exclusion was set to simulate the drought stress, and the PSYPRO water potential measurement system was used to quantitatively analyze the trend of leaf water potential change in the predawn with the growth season and bamboo age. L Result J （1） Thexc was significant diffexcnce a- mong diffexcnt seasons for leaf pxcdawn water potential for the same age of bamboo （ P 〈 0.05 ） , xcgardless of throughfall exclusion or not. （2） The leaf plcdawn water potential changing with the growth season showed a peak txcnd for the same age of bamboo, and was diffexcnt due to bamboo age. Under natural growth environment （the control） , the pxcdawn water potential for 1- and 7-year-old bamboo changing with the seasonal showed a single peak with the highest value in September, and for 2- to 5-year-old individual it showed a bimodal change tlcnd with the highest values in September and December xcspectively. The seasonal change trend of leaf pxcdawn water potential was consistent with the soil moistmc. After the throughfall exclusion, the leaf plcdawn water potential was “double peak” type for 1- and 2-year-old individual, and was “ single peak” type for 3- to 5-year-old individual, which changed with the seasons. （3） The change with increasing age of bamboo for leaf pxcdawn water potential under throughfall exclusion environment was similar to that of the control during diffelcnt growth season. Regardless of throughfall exclusion or not, the leaf predawn water potential decreased with the increase of bamboo age during the rhizome vigorous growth season from August to October, and showed the trend of the water transport from young bamboos to old ones, while the leaf predawn water potential increased with the increase of bamboo age during the shoot development period from October to Match the following year, and the water transported from the high water potential of old bamboo to low water potential of young ones, indicating that the water supply direction between dif- ferent age of bamboo individuals changed in different season. （4） During the vigorous growth of rhizome, the leaf predawn water potential under throughfall exclusion was significantly lower than that under natural growth environ- ment, and the difference in leaf predawn water potential became mote significant with the increase of bamboo age. Under throughfall exclusion, only the leaf predawn water potential of the bamboo with the age over 5-years-old was lower than the control during the shoot development period. （5） There wetc no significant differences in predawn water potential of different canopy leaves in different growth seasons, but the change trend of leaf water potential was also affected by the bamboo age. [ Conclusion I There was a significant seasonal difference of leaf predawn water potential for same aged individual. Both the leaf predawn water potential and the soil moistmc follow same seasonal change trend. The transport direction of water between different age of bamboo individuals varied with season, indi- cating that the leaf predawn water potential is an important factor in driving the bamboo to adapt to drought stress.