干旱区生态环境知识资源中心(Arid): 基于分层投影盖度的荒漠植被相对生态功能测定

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	基于分层投影盖度的荒漠植被相对生态功能测定
其他题名	Determination of relative ecological function of desert vegetation based on layered projection cover
	常兆丰; 张大彪; 段小峰; 韩福贵; 仲生年; 王强强; 张剑挥
来源期刊	干旱区地理
ISSN	1000-6060
出版年	2016
卷号	39 期号:4 页码:777-784
中文摘要	以往有关荒漠植被的生态功能的研究基本上是以盖度为主要指标的,而荒漠植物枝条极不规则,盖度不能反映植物覆盖地表的真实状况,且盖度与投影盖度一般不存在对应关系,加之荒漠植被稀疏,用盖度不仅不能表征植物的生态功能和地位,而且往往忽视了植物高度的生态功能。以2002-2013年民勤荒漠区定位样方观测资料为例,运用分层投影盖度分析了5种主要植物群落的生态功能,结论表明:2002-2013年这5种植物群落的盖度大小的排序是:白刺 >梭梭+白刺 >沙蒿 >麻黄>梭梭,投影盖度大小的排序是:梭梭+白刺 >白刺>麻黄>沙蒿 >梭梭,生态功能排序是:白刺 >麻黄 >梭梭+白刺 >梭梭 >沙蒿,即植被盖度、投影盖度和生态功能并不对应。研究结论认为:今后在做荒漠植物功能分析亦即用到植物的盖度时,应以投影盖度为主,而冠幅盖度只应作为一个对照参考指标;在研究荒漠植物的生态功能时,植株高度是一个不可忽视的重要指标。
英文摘要	Though coverage has been regarded as the key indicator of ecological functions and status of desert vegetation for a long time, it cannot reflect the real situation of plant cover surface because of its very irregular branches; besides, generally there is no corresponding relationship between cover and the projector cover, then the vegetation cover cannot characterize the ecological functions and status of the plant, and it also often resulted in overlook of the ecological function of plant height. As an example, the ecological functions of 5 kinds of main plant communities were analyzed by using the layered projection cover degrees with locating plots observation data from 2002 to 2013 years in Minqin desert area,Gansu Province, China. The results show that cover and projection cover of desert vegetation was quite different, e.g. the average projected coverage of Nitraria tangutorum communities was only 28.6% of crown cover. From large to small, the vegetation cover of the 5 kinds of plant communities in 2002-2013 were ranked as:Nitraria tangutoru,Haloxylon ammodendron + Nitraria tangutorum, Artemisia arenaria,Ephedraprzewalskii and Haloxylon ammodendron;for projection cover, they were ranked as: Haloxylon ammodendron + Nitraria tangutorum, Nitraria tangutorum, Ephedra przewalskii, Artemisia arenaria and Haloxylon ammodendron; and for ecological functions,they were ranked as: Nitraria tangutorum,Ephedra przewalskii, Haloxylon ammodendron + Nitraria tangutorum, Haloxylon ammodendron and Artemisia arenaria,in-dicating that the vegetation cover, projector cover and ecological functions did not correspond with each other. When taking the standard deviation of interannual variation of vegetation cover and projected cover as the representatives for the community stability,the communities with lower coverage showed higher stability, while those with higher coverage showed relatively lower stability, e.g. vegetation cover of Ephedra przewalskii community was relatively low, but the community was most stable; vegetation cover of Haloxylon ammodendron + Nitraria tangutorum was relatively high, but stability of community was the worst. Accumulating sand to dune is an important manifestation of plant functions for sand prevention and sand fixation, and results show that the closer leaves were to the ground, the more conducive the plants accumulate sand to mound, e.g. the Nitraria tangutorum nebkha was conducive to accumulation sand to dune, but the Haloxylon ammodendron was not because its branches mainly distributed in the range of 60-210 cm height, and there was a taproot above the ground diameter. The ecological functions of the height for desert plants mainly reflected in: first, the height range to prevent wind and fix sand is larger; second, the sparse plant density, sparse plant shoots and the relatively high latitude make every layer of the desert plants can conduct photosynthesis, absorb and consume solar energy, and further regulate temperature. Innovation points of the article are: calculating the ecological functions with hierarchical cover of vegetation communities, considering the ecological functions of plant height, and finally proposing the projection cover of vegetation. It is recommended that the layered cover must be calculated dominantly with the projected cover in future function analysis of desert plants.
中文关键词	植物群落 ; 分层投影盖度 ; 测定 ; 生态功能 ; 民勤荒漠区
英文关键词	plant communities layered projection cover determination ecological functions Minqin desert area
语种	中文
国家	中国
收录类别	CSCD
WOS类目	FORESTRY
WOS研究方向	Forestry
CSCD记录号	CSCD:5763222
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/2XILL650/234251
作者单位	甘肃省治沙研究所, 兰州, 甘肃 730070, 中国
推荐引用方式 GB/T 7714	常兆丰,张大彪,段小峰,等. 基于分层投影盖度的荒漠植被相对生态功能测定[J]. 甘肃省治沙研究所,2016,39(4):777-784.
APA	常兆丰.,张大彪.,段小峰.,韩福贵.,仲生年.,...&张剑挥.(2016).基于分层投影盖度的荒漠植被相对生态功能测定.干旱区地理,39(4),777-784.
MLA	常兆丰,et al."基于分层投影盖度的荒漠植被相对生态功能测定".干旱区地理 39.4(2016):777-784.