干旱区生态环境知识资源中心(Arid): 古尔班通古特沙漠土壤种子库和幼苗的空间格局---灌丛的保护效应

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	古尔班通古特沙漠土壤种子库和幼苗的空间格局---灌丛的保护效应
其他题名	Spatial Patterns of Soil Seed Bank and Seedlings in the Gurbantunggut Desert: The Nurse Effect of Shrubberies
	张盈 1; 李君 2
来源期刊	干旱区研究
ISSN	1001-4675
出版年	2018
卷号	35 期号:5 页码:1138-1145
中文摘要	荒漠生态系统中灌丛通过生境改造而对其周围植物产生保护效应,这种正交互作用是荒漠植物群落构建的重要驱动力。本文采用室内萌发法观测了古尔班通古特沙漠南缘不同沙丘部位梭梭冠下、冠缘和灌丛间地3种微生境土壤种子库,并调查了相同采样微生境自然条件下幼苗密度及物种组成,以探讨梭梭保护效应对其周围植物生活史早期阶段的影响。研究结果: ①土壤种子库和地上幼苗库中以一年生草本和短命植物占绝对优势。 ②土壤种子库密度从梭梭冠下经冠缘至灌丛间地逐渐减小,在冠下、冠缘与灌丛间地分别为(689 67)粒·m~(-2)、 (578 58)粒·m~(-2)、(350 48)粒·m~(-2),梭梭灌丛对植物种子具有明显的聚集效应,但这种聚集效应在沙丘顶部不明显。③梭梭冠缘处自然条件下相对萌发率最高,为61%,冠下和灌丛间地则差异不明显,表明灌丛覆盖对种子萌发的影响在灌丛中心至灌丛间地这一小尺度上具有分异,冠缘处植物从梭梭保护效应中获益最大。土壤种子库和幼苗库的空间格局表明,古尔班通古特沙漠梭梭通过对种子的聚集效应及对种子库萌发成苗的促进作用,对其冠下植物在萌发期这一生活史早期阶段具有明显的保护效应。研究结果对深入理解荒漠生态系统中种间正交互作用的发生机理具有重要意义。
英文摘要	Known as thenurse effect, shrubberies in desert ecosystem of ten benefit understory plants through microhabitat amelioration,and they are the typical facilitation structuring plant communities in desert. In this study, the germination method was used to investigate the soil seed bank at three microhabitats relative to the individuals of the dominant shrub species Haloxylon ammodendron,i. e.,under shrubbery, shrubbery periphery and inter-shrubbery open area,across an area between two dunes in the southern marginal zone of the Gurbantunggut Desert. Field seedlings close to the soil seed bank sampled at the microhabitats were also investigated in spring. Our aims were to explore the nurse effect of H. ammodendron on the understory plants at early stage of the life history. The results showed that the soil seed bank and aboveground seedling bank were dominated by annuals and ephemerals. Density of the soil seed bank decreased gradually away from the shrubbery core〔(689 67) seed·m~(-2)〕to the periphery 〔(578 58) deed·m~(-2)〕and to the inter-shrubbery open area〔(350 48) seed·m~(-2)〕, showing an enrichment effect of shrub seeds. However, this effect was not significant at the dune crest. Germination rate of soil seed bank was the highest at the shrubbery periphery(61%),but the difference between the shrubbery core and inter-shrubbery open area was not significant,which indicated that there was a fine-scale zonation of the shrubbery effect on germination from shrubbery core to inter-shrubbery open area. Correspondingly, the nurse effect of seedlings from H. ammodendron was the highest at shrubbery periphery. Through aggregating seeds and promoting seedling settling, H. ammodendron has a significant nurse effect on the understory plants in the Gurbantunggut Desert at the early stage of life history. Our findings provide the insights into the occurrence mechanism of interspecific positive interactions in arid ecosystems.
中文关键词	梭梭 ; 保护效应 ; 土壤种子库 ; 地上幼苗库 ; 微生境 ; 空间格局 ; 古尔班通古特沙漠
英文关键词	Haloxylon ammodendron nurse effect soil seed bank aboveground seedling bank microhabitat spatial pattern Gurbantunggut Desert
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:6334393
来源机构	中国科学院新疆生态与地理研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/237679
作者单位	1.中国科学院新疆生态与地理研究所;;中国科学院大学, 荒漠与绿洲生态国家重点实验室;;, 乌鲁木齐;;, 新疆;;北京 830011;;100049, 中国; 2.中国科学院新疆生态与地理研究所, 荒漠与绿洲生态国家重点实验室, 乌鲁木齐, 新疆 830011, 中国
推荐引用方式 GB/T 7714	张盈,李君. 古尔班通古特沙漠土壤种子库和幼苗的空间格局---灌丛的保护效应[J]. 中国科学院新疆生态与地理研究所,2018,35(5):1138-1145.
APA	张盈,&李君.(2018).古尔班通古特沙漠土壤种子库和幼苗的空间格局---灌丛的保护效应.干旱区研究,35(5),1138-1145.
MLA	张盈,et al."古尔班通古特沙漠土壤种子库和幼苗的空间格局---灌丛的保护效应".干旱区研究 35.5(2018):1138-1145.