杉木林下套种不同阔叶树种的耐荫性比较  

Comparison of shade tolerance of different broad-leaved treespecies under Cunninghamia lanceolataforest

作　　者：刘振华[1] 孙良 李光强 林峰[1] 程勇[1] 张勰[1] LIU Zhenhua;SUN Liang;LI Guangqiang;LIN Feng;CHENG Yong;ZHANG Xie(Hunan Academy of Forestry,Changsha 410004,Hunan,China;Liuyanghu State-owned Forest Farm of Liuyang City,Liuyang 410300,Hunan,China)

机构地区：[1]湖南省林业科学院,湖南长沙410004 [2]浏阳市浏阳湖国有林场,湖南浏阳410300

出　　处：《湖南林业科技》2024年第4期27-32,共6页Hunan Forestry Science & Technology

基　　金：国家重点研发计划(2021YFD2201304);湖南林业外资项目科技支撑项目(OT-S-KTA1);长沙市杰出青年培养计划(kq2009087)。

摘　　要：以青冈、赤皮青冈、木荷和闽楠等4种阔叶树为研究对象,分别测定其在杉木林下及苗圃地中的生长指标、叶绿素相对含量和叶绿素荧光参数,分析这4种阔叶树的耐荫能力。结果表明:林下套种时,4种阔叶树的树高和地径生长均受到抑制;青冈、木荷和闽楠的地径在林下和苗圃地之间具有显著差异,青冈、木荷的株高在林下和苗圃地之间具有极显著差异。林下4种阔叶树的叶绿素相对含量均高于苗圃地中的;林下4种阔叶树的PSⅡ实际光化学效率(Q_(y))较苗圃地中的均有所下降。林下套种时,4种阔叶树的初始荧光(F_(o))大小排序为赤皮青冈的<青冈的<闽楠的<木荷的,最大荧光(F_(m))和可变荧光(F_(v))均表现为闽楠的<赤皮青冈的<青冈的<木荷的;4种阔叶树均受到一定程度的弱光胁迫,其中闽楠受胁迫最为严重;PSⅡ最大光化学效率(F_(v)/F_(m))和PSⅡ潜在活性(F_(v)/F_(o))与苗圃地中的相比均下降,均为闽楠的<青冈的<木荷的<赤皮青冈的。隶属函数法综合评价表明,4种阔叶树耐荫能力大小依次为赤皮青冈的>木荷的>青冈的>闽楠的。研究结果为杉木林下套种阔叶树种的选择及光环境的调整提供了依据。The growth indexes,relative chlorophyll content and chlorophyll fluorescence parameters of Quercus glauca,Quercus gilva,Schima superba,and Phoebe bournei under Cunninghamia lanceolata forest and in the nursery were measured to analyze the shade tolerance of these four broad-leaved tree species.The results showed that the tree height and ground diameter growth of the four species were inhibited when planted under C.lanceolata forest.The ground diameters of Q.glauca,S.superba,and P.bournei had significant differences,and the plant heights of Q.glauca and S.superba had extremely significant differences between under forest and in the nursery.The relative chlorophyll contents of these four kinds of trees under the forest were higher than those in the nursery.The actual photochemical efficiencies(Q_(y))of PSⅡof the four kinds of trees under the forest were lower than those in the nursery.The initial fluorescence(F_(o))was in the order of Q.gilva<Q.glauca<P.bournei<S.superba.Both the maximum fluorescence(F_(m))and variable fluorescence(F_(v)) bournei<Q.gilva<Q.glauca<S.superba.The four tree species were subjected to a certain degrees of low-light stress,among which P.bournei was affected most severely.Both maximum photochemical efficiencies(F_(v)/F_(m))and potential activities(F_(v)/F_(o))of PS II of all four broad-leaved tree species under the forest were lower than those in the nursery,which were P.bournei<Q.glauca<S.superba<Q.gilva.The shade tolerance of the four species evaluated by the comprehensive evaluation of the membership function method showed that the shade tolerance was in the order of Q.gilva>S.superba>Q.glauca>P.bournei.The results provided a basis for the selection of broad-leaved tree species and the adjustment of light environment under C.lanceolata forest.

关 键 词：阔叶树 杉木 林下套种 耐荫性 

分 类 号：Q945[生物学—植物学]