C4 plants in the deserts of China: occurrence of C4 photosynthesis and its morphological functional types
C4 plants in the deserts of China: occurrence of C4 photosynthesis and its morphological functional types
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DOI：
10.1007/s11099-007-0028-y
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发表时间：
2007-06
期刊：
影响因子：
2.7
通讯作者：
R. Wang
中科院分区：
文献类型：
--
作者：
R. Wang
对中国荒漠植物10科45属104种的C4光合途径和形态功能类型进行了测定。C4植物中双子叶植物（藜科、桑科、苋科）67种（64.4%），单子叶植物（禾本科、莎草科、鸭跖草科）37种。36.5结果表明，在荒漠地区的藜科植物中，有%的种类具有C4光合作用，约占总C4种类的48%，主要分布在假木贼属、滨藜属、地肤属、猪毛菜属和碱蓬属。许多C4植物（58.7%）是一年生植物（如苋属、滨藜属、马唐属、画眉草属、地肤属和猪毛菜属），经历了长期干旱、高温和高光照。荒漠地区的藜科植物（如假木贼属、樟树属、梭梭属、猪毛菜属）和蓼科植物（如沙拐枣属）中C4灌木种类相对较多（104种中有28种）。灌木C4种叶面积小，高度多在1 m以下，分布于桑迪土壤中。一年生种、灌木和藜科C4种相对较多是荒漠C4种分布的主要特征，这与干旱的环境条件密切相关。
C4photosynthetic pathway and morphological functional types were determined for 104 species in 45 genera and 10 families from the deserts of China. 67 C4species (64.4 %) were found inDicotyledoneae(e.g. Chenopodiaceae, Polygonaceae, andAmaranthaceae), the other 37 species were inMonocotyledoneae(e.g. Gramineae, Cyperaceae, andCommelinaceae). 36.5 % of theChenopodiaceaespecies (predominantly members of the generaAnabasis, Atriplex, Kochia, Salsola, andSuaeda) identified in the desert regions were found with C4photosynthesis, which was about 48 % of the total C4species. Many C4species (58.7 %) were annuals (e.g. Amaranthus, Atriplex, Digitaria, Eragrostis, Kochia, andSalsola) and experienced long-term droughts, high temperature, and high irradiance. Relatively more shrub C4species (28 species of 104) were found inChenopodiaceae(e.g. Anabasis, Camphorosma, Haloxylon, andSalsola) andPolygonaceae(e.g. Calligonum) in the desert regions. Most of shrub C4species with small leaf area were no more than 1 m in height and distributed in sandy soils. Composition of relatively more annual species, shrubs, andChenopodiaceaeC4species was the primary characteristic for the C4species occurrence in deserts, and this was remarkably related with the arid environmental conditions.