干旱区生态环境知识资源中心(Arid): 祁连山北坡青海云杉林线的空间分布及影响因素

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	祁连山北坡青海云杉林线的空间分布及影响因素
其他题名	Spatial distribution and influencing factors of Picea crassifolia treelines on northern slopes of the Qilian Mountains
	边瑞; 勾晓华; 年雁云
来源期刊	兰州大学学报. 自然科学版
ISSN	0455-2059
出版年	2020
卷号	56 期号:6 页码:711-717
中文摘要	根据森林样方调查和Google Earth影像解译,提取祁连山59个青海云杉林线样点,通过经纬度与林线海拔的关系探索林线的空间分布规律,采用随机森林法对影响林线空间分布地形气候要素的重要性进行排序,分析主要因子与林线分布高度的相关关系.结果表明,祁连山青海云杉林线海拔与经度呈负相关,${R^2} = 0.35$,与纬度呈正相关,${R^2} = 0.26$;平均温度、平均风速、日照百分率是影响林线分布最重要的3个因素;回归分析表明,温度与林线海拔的相关性最高,${R^2} = 0.73$.气候变量是影响祁连山青海云杉林线空间分布差异的主要因素,为解释祁连山林线空间分布格局、探索干旱区林线形成研究提供参考依据.
英文摘要	According to the field data and images from Google Earth,the effects of longitude and latitude on Picea crassifolia treeline elevation variability at 59 study areas across the Qilian Mountains were analyzed.A spatial interpolation model to generate local-scale(90 m)climatic indices at these treelines was applied and topographic indices were derived by ArcGIS from digital elevation models.Random forest enabled us to tease apart the relative effects of 6 explanatory factors on treeline elevation variability and,to explore,by the unitary linear regression,how explanatory factors influenced treeline elevation.The results showed that there was a negative correlation between the treeline elevation and longitude $left( {{R^2} = 0.35} ight)$,and a positive correlation between the treeline elevation and latitude $left( {{R^2} = 0.26} ight)$.The importance ranking of random forest indicated that the most important factors that influenced the distribution of treelines were average temperature,average wind speed and percentage of sunshine.The regression analysis showed that temperature was the most important factor affecting the treelines elevation,and ${R^2} = 0.73$.The results demonstrated which factors affected the treeline elevations of P.crassifolia across the Qilian Mountains by using various meteorological indexes and this could provide references for explaining the spatial distribution pattern of treelines in the Qilian Mountains and exploring the formation of treelines in the arid area.
中文关键词	祁连山 ; 青海云杉 ; 气候 ; 林线
英文关键词	Qilian Mountains Picea crassifolia climate treeline
类型	Article
语种	中文
收录类别	CSCD
WOS类目	Plant Sciences
CSCD记录号	CSCD:6884114
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/353647
作者单位	边瑞, 兰州大学资源环境学院, 西部环境教育部重点实验室, 兰州, 甘肃 730000, 中国. 勾晓华, 兰州大学资源环境学院, 西部环境教育部重点实验室, 兰州, 甘肃 730000, 中国. 年雁云, 兰州大学资源环境学院, 西部环境教育部重点实验室, 兰州, 甘肃 730000, 中国.
推荐引用方式 GB/T 7714	边瑞,勾晓华,年雁云. 祁连山北坡青海云杉林线的空间分布及影响因素[J],2020,56(6):711-717.
APA	边瑞,勾晓华,&年雁云.(2020).祁连山北坡青海云杉林线的空间分布及影响因素.兰州大学学报. 自然科学版,56(6),711-717.
MLA	边瑞,et al."祁连山北坡青海云杉林线的空间分布及影响因素".兰州大学学报. 自然科学版 56.6(2020):711-717.