干旱区生态环境知识资源中心(Arid): 干旱区沙漠化逆转过程中优势种群及其根系特征研究

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	干旱区沙漠化逆转过程中优势种群及其根系特征研究
其他题名	Dominant populations and its root characteristics in progressive succession of desertification land in arid area
	陈芳; 马全林; 王继和; 徐丽恒
ISSN	1003-7578
出版年	2009
卷号	23 期号:7 页码:148-153
中文摘要	根系是植物群落演替的重要内容,对植被演替过程具有十分重要影响作用.采用时空替代法,选择不同恢复阶段,研究了干旱荒漠区植被恢复演替不同阶段优势种群及其根系生态特征.结果表明:沙漠化逆转过程中,优势种群更替过程为:沙米-沙蒿-油蒿-紫婉木、针茅;在恢复演替初期(初始阶段,先锋阶段)植被根系浅(平均＜50cm)而水平分布范围广,侧根数量少但生长旺盛;随着恢复时间的加长,优势种群根系分布深度增加,侧根数量增加但水平生长受到一定的抑制,根幅逐渐减小;优势种群根冠比的变化趋势为沙米(初始阶段)＜沙蒿(先锋阶段)＜油蒿(发展阶段)＜针茅(原生群落).研究同时发现,同一种群在不同的演替阶段具有不间的根系分布特征和规律.对于沙蒿种群来说,根冠比是发展阶段(0.56)＞先锋阶段(0.36),而地上、地下生物量却是先锋阶段(360.83g,161.33g)＞发展阶段(32.8g,16.81g);而油蒿根冠比则是发展阶段(0.61)＞相对稳定阶段(0.21).各演替阶段根系和土壤环境因子之间存在相互影响,优势种群根系生物量及生物量分布与上壤颗粒组成、土壤水分的空间分布有着密切的关系.
英文摘要	Roots play an important role in plant progressive succession. The dominant population and its root characteristics under different recovery phases in progressive succession on desertification land in arid area were studied with the method of substituting time with space. The results indicated that; In the desertification revert process, the dominant population changed from Agriophyllum squarrosum to Artermisia sphaerocephala to Artermisia ordosica to Stipa plareosa and Asterothamnus centrali-asiaticus. In the early time of progressive succession (the initial stage and the pioneer stage), the dominant populations had shallow root system (an average of ＜50 cm), but the horizontal distribution was wide. There were a few lateral roots but grew exu-berantly. With the increase of enclosure time, the root depth of dominant population increased but horizontal growth was inhibited. The root-shoot ratio for dominant population was Agriophyllum squarrosum (the initial stage) ＜ Artermisia sphaerocephala (the pioneer stage) ＜ Artermisia ordosica (the development stage) ＜ Stipa plareosa (Original vegetation). The study also found that the same populations in different stages of succession had different root distribution system and the laws. Root biomass had a close relation with soil particles and the spatial distribution of soil moisture.
中文关键词	植被恢复 ; 优势种群 ; 根系生态特征 ; 土壤颗粒组成 ; 土壤含水量
英文关键词	vegetation restoration dominant population ecological characteristics of roots soil particles soil water content
语种	中文
国家	中国
收录类别	CSCD
WOS类目	PLANT SCIENCES
WOS研究方向	Plant Sciences
CSCD记录号	CSCD:3583451
来源机构	甘肃省治沙研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/223685
作者单位	甘肃省治沙研究所, 甘肃省荒漠化防治重点实验室, 武威, 甘肃 733000, 中国
推荐引用方式 GB/T 7714	陈芳,马全林,王继和,等. 干旱区沙漠化逆转过程中优势种群及其根系特征研究[J]. 甘肃省治沙研究所,2009,23(7):148-153.
APA	陈芳,马全林,王继和,&徐丽恒.(2009).干旱区沙漠化逆转过程中优势种群及其根系特征研究.,23(7),148-153.
MLA	陈芳,et al."干旱区沙漠化逆转过程中优势种群及其根系特征研究".23.7(2009):148-153.