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为研究匍匐茎草本植物对基质养分供应水平的生物量分配格局的可塑性,在一盆栽实验中对绢毛匍匐委陵菜(Potentilla reptans var. sericophylla)进行了8种不同的养分处理。绢毛匍匐委陵菜植株生物量、匍匐茎数、分株数以及匍匐茎节间长在中等养分条件下最大。随土壤养分的降低,绢毛匍匐委陵菜对叶片和叶柄的生物量投资减小,而对根系的生物量投资增加。在中等养分条件下,绢毛匍匐委陵菜对匍匐茎的生物量投资倾向于最大,而在更高或更低的养分条件下倾向于减少。此生物量分配格局与de Kroon和Schieving的模型模拟结果相符合,结果表明在中等资源水平下增加对匍匐茎的生物量投资是克隆植物增加资源获取的对策之一。 相似文献
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报道了采自西藏墨脱县悬钩子属绢毛亚组Rubus subsect.Lineati (Focke) Yü et Lu两个中国新纪录种,即酒红悬钩子R.calophyllus Clarke.和炫丽悬钩子R splendidissimus Hara. 相似文献
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袁杰 《中国野生植物资源》1984,(3)
宝树(Butea monosperma)为豆科落叶乔木。树干扭曲,枝条多下垂;三出复叶,叶柄长约15厘米;小叶广卵形,长约15至20厘米,宽10至15厘米,革质,表面光滑,叶背有不显之淡黄棕色毛。顶生一枝叶较大。托叶退化为黄棕色刺芒状。花为鲜艳之桔红色,呈穗状着生于中上部枝条的先端。花期三至四月,开花后老叶渐次落完,俟花败时始发新叶。荚果10 相似文献
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1.长角瘤虻 Hybomitra longicorna,新种(图1) 雌虫体长16毫米。 头部 前额黄灰色,两侧平行并覆长黑毛,高度为基部宽度的2.4倍。基胛红棕色,略似圆形,有皱纹,两侧与眼分离,上端延线粗短而不超过前额高度1/2。单眼瘤大而明显,呈三角形,红棕色。亚胛低,具黄灰色粉被。颊、颜黄灰色并覆黄白色长毛,颊有少量黑 相似文献
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描述了产自云南的球兰属一新种四花球兰(Hoya tetrantha J.F.Zhang,Y.H.Tong&N.H.Xia).该种为附生灌木,具有一年生的顶生花序和小型叶片,而与产自缅甸的狄克森球兰(H.dickasoniana P.T.Li)相似,但该种叶片卵形至阔卵形,先端锐尖,具短尖头,花序通常具4朵花,萼片线形且... 相似文献
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报道了桦木科(Betulaceae)鹅耳枥属(Carpinus L.)一新种——香港鹅耳枥(C.insularis N.H.Xia,K.S.PangY.H.Tong)。香港鹅耳枥与太鲁阁鹅耳枥(C.hebestroma Yamamoto)及多脉鹅耳枥(C.polyneura Franch.)相似,但习性灌木状,叶具13~16对侧脉,先端锐尖,边缘锯齿的芒尖较短,果苞宽半卵形或半卵形,长8~14 mm,小坚果顶端密被长柔毛且疏具树脂状腺体,与后两者易于区别。 相似文献
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报道了木兰科(Magnoliaceae)含笑属(Michelia L.)一新种:台山含笑(M. taishanensis Y. H. Tong,X. E. Ye,X. H. Ye & Yu Q. Chen)。该新种目前仅分布于我国广东台山市的北峰山,与广东含笑(M. guangdongensis Y. H. Yan,Q. W. Zeng & F. W. Xing)近缘,但其叶柄更纤细,叶背老时变无毛,雄蕊较多且较长,花丝白色,药隔短小而与后者区别。 相似文献
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报道了广西石灰岩地区苦苣苔科报春苣苔属(Primulina Hance)1新种——北流报春苣苔(P. beiliuensis B. Pan & S. X. Huang)。该新种在形态上与黄花牛耳朵[P. lutea(Yan Liu & Y. G. Wei)Mich. Möller & A. Weber]较近,但叶宽卵形,叶基部近心形,叶缘具浅钝齿或呈浅波状齿,花冠紫色,花冠、花序梗、花梗、苞片及花萼均被紫色短柔毛而区别与后者; 分子生物学证据表明,在系统发育上与桂林小花苣苔[P. repanda var. guilinensis(W. T. Wang)Mich. Möller & A. Weber]近缘,但两者在形态学上相差较远。 相似文献
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Qiao‐Mei Qin Yi‐Hua Tong Xi‐Rong Zheng Jing‐Bo Ni Tien‐Chinh Vu Nian‐He Xia 《Nordic Journal of Botany》2019,37(1)
Here we describe and illustrate a new species, Melocalamus grandiauritus N.H. Xia, Q.M. Qin & J. B. Ni sp. nov., from the lowland forest in Thanh Hoa Province, Vietnam. Molecular phylogeny based on the GBSSI indicates that this species is a member of Melocalamus. Morphologically, M. grandiauritus is different from all congeneric species in Vietnam. It is somewhat similar to M. pacoensis H.N.Nguyen & V.T.Tran, but is easily distinguished by having much wider suborbicular culm leaf auricles, very high and ventricose auricles of foliage leaves, entire ligules of both culm leaves and foliage leaves, and large leaf blades. 相似文献
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描述了产自贵州的竹亚科一新种:黎平玉山竹(Yushania lipingensis Z. X. Zhang, Y. H. TongZ. Yang)。本种形态上与显耳玉山竹(Y. auctiaurita T. P. Yi)接近,但区别在于该种箨鞘背面密被向上的黄褐色或紫色疣基刺毛,箨耳及叶耳明显弯曲呈镰刀形,鞘口繸毛发达,通常呈放射状,箨舌先端截平,不圆拱,边缘密生短纤毛,箨片腹面被微柔毛,叶片次脉通常5~6对。 相似文献
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该文描述了江西东北部菊科兔儿风属一新种——婺源兔儿风(Ainsliaea wuyuanensis Z.H.Chen,Y.L.Xu et X.F.Jin),并附有线描图和彩色照片。婺源兔儿风是密聚组(Sect.Aggregatae Beauv.)一个非常特殊的种,与本组的其他种类区别很大。从叶脉类型来看与粗齿兔儿风(A.grossedentata Franch.)比较接近,区别在于其叶片较大,菱形或菱状卵形,长11~17 cm,顶端渐尖,基部楔形,叶缘中上部具1~2对裂片状粗大锯齿,两面无毛;叶柄长2~14 cm;总苞片顶端锐尖;瘦果较长,密被污黄色糙毛。 相似文献
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In this study, the effects of coal dust on four, sympatric, wetland tree species in Richards Bay Harbour were investigated.
We tested the hypothesis that leaf micromorphology influenced dust accumulation and that coal dust occluded stomata and reduced
photosynthetic performance of three mangroves, Avicennia marina, Bruguiera gymnorrhiza and Rhizophora mucronata, and a mangrove associate, Hibiscus tiliaceus. To investigate leaf micromorphology, leaf blade material of the four species was prepared following standard procedures
and viewed under scanning electron microscopy. Gas exchange and chlorophyll fluorescence measurements were made at saturating
light (>1000 μmol m−2 s−1) and high temperature (>25 °C) on leaves that were either covered or uncovered with coal dust. There was no evidence of occlusion
of stomata by dust. Dust accumulation in A. marina and H. tiliaceus was exacerbated by the presence of a dense mat of trichomes on the undersurface of the leaves, as well as by the sticky brine
secreted by salt glands in the former species.Coal dust significantly reduced CO2 exchange, Photosystem II (PS II) quantum yield and electron transport rate (ETR) through PS II in A. marina and H. tiliaceus but not in the other two mangroves. Reduction in photosynthetic performance was attributed to reduction in light energy incident
on the photosynthetic tissues. 相似文献