CAJ | 학술논문

对福建永春毛竹(Phyllostachyspubescens Mazel ex H.de Lehaie)叶片衰老过程的叶重量、叶面积及元素内吸收率的动态进行了研究,并对元素内吸收率RE1(以元素的干重含量为计算单位,mg/g)、RE2(以单位叶片的元素含量为计算单位,mg/leaf)以及RE3(以单位叶面积的元素含量为计算单位,mg/cm2)进行了比较.叶片衰老过程中,平均叶重量、叶面积及比叶重分别下降了19.55%、15.16%和5.07%.叶重量与叶面积下降百分率的季节变化趋势一致,说明毛竹叶片存在一定的重量与面积比率.在不同的元素内吸收率比较中,N和K的元素内吸收率均为正,Ca均为负,表明叶片衰老过程中N和K的元素含量从衰老叶片中转移至植株的其他部位,而Ca在老叶中累积.N、P、K、Ca和Mg5种元素平均的元素内吸收率高低顺序均为RE2＞RE3＞RE1,反映出以元素的干重含量为计算单位和以单位叶面积的元素含量为计算单位的元素内吸收率偏低.
대복건영춘모죽(Phyllostachyspubescens Mazel ex H.de Lehaie)협편쇠로과정적협중량、협면적급원소내흡수솔적동태진행료연구,병대원소내흡수솔RE1(이원소적간중함량위계산단위,mg/g)、RE2(이단위협편적원소함량위계산단위,mg/leaf)이급RE3(이단위협면적적원소함량위계산단위,mg/cm2)진행료비교.협편쇠로과정중,평균협중량、협면적급비협중분별하강료19.55%、15.16%화5.07%.협중량여협면적하강백분솔적계절변화추세일치,설명모죽협편존재일정적중량여면적비솔.재불동적원소내흡수솔비교중,N화K적원소내흡수솔균위정,Ca균위부,표명협편쇠로과정중N화K적원소함량종쇠로협편중전이지식주적기타부위,이Ca재로협중루적.N、P、K、Ca화Mg5충원소평균적원소내흡수솔고저순서균위RE2＞RE3＞RE1,반영출이원소적간중함량위계산단위화이단위협면적적원소함량위계산단위적원소내흡수솔편저.
Dynamics of leaf mass (LM), leaf area (LA) and element retranslocation efficiency during leaf senescence was investigated in Phyllostachys pubescens Mazel ex H. de Lehaie in Yongchun, Fujian,China. Comparison of differences in element retranslocation efficiencies (RE) based on per gram leaf dry weight, per leaf and per LA during leaf senescence was carried out. With leaf senescence, the mean decreases of LM, LA and specific leaf mass (SLM) were 19.55%, 15.16% and 5.07%, respectively. The seasonal changes in decrease percentage of LM and LA were similar, indicating that certain mass to area ratios occurred in P. pubescens leaves. On different bases, RE of N and K was positive, while RE of Ca was negative, suggesting that with leaf senescence, N and K were translocated out of senescing leaves to other parts of plant, while Ca accumulated in senescing leaves. For the mean RE of N, P, K, Ca and Mg on different bases, the rank order was RE2 (mg element/leaf)＞RE3 (mg element/cm2 leaf)＞RE1 (mg element/g), therefore, RE on the basis of leaf weight or LA would be underestimated.