干旱区生态环境知识资源中心(Arid): 青藏高原东北部不同降水梯度下高山林线祁连圆柏径向生长与气候关系的比较

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	青藏高原东北部不同降水梯度下高山林线祁连圆柏径向生长与气候关系的比较
其他题名	Comparison of growth-climate relationship of Sabina przewalskii at different timberlines along a precipitation gradient in the northeast Qinghai-Xizang Plateau, China
	宋文琦 1; 朱良军 1; 张旭 1; 王晓春 1; 张远东 2
来源期刊	植物生态学报
ISSN	1005-264X
出版年	2018
卷号	42 期号:1 页码:66-77
中文摘要	为了了解青藏高原东北部不同降水梯度下,高山林线处的树木径向生长与气候关系是否存在差异,在青海东北部从西北到东南沿降水梯度设置3个高山林线采样点:乌兰县哈里哈图国家森林公园(HL,年降水量217 mm)、都兰县曲什岗(QS, 281 mm)和同德县河北林场(HB, 470 mm),运用树轮年轮学方法分析林线优势种祁连圆柏(Sabina przewalskii)的径向生长-气候关系随降水梯度的变化规律。结果表明:不同降水梯度下,降水对祁连圆柏径向生长的限制作用差异不明显,但温度对祁连圆柏径向生长的影响存在显著差异。在低降水区域(HL),冬、夏季最低气温主要限制祁连圆柏径向生长,并且在不同气候特征年中无明显变化;在中降水区域(QS),祁连圆柏的径向生长明显受冬季最低气温影响,与低降水区域相比,春、夏季最低气温对祁连圆柏径向生长的限制作用减弱,并且主要限制因子在不同气候特征年存在显著变化;在高降水区域(HB),冬、夏季最低气温对祁连圆柏径向生长的限制作用不显著,而春、秋季最低气温对祁连圆柏径向生长的抑制作用显著增加,并且主要集中在高温年和干旱年。该研究结果并未支持干旱(湿润)区高山林线树木径向生长主要由水分(温度)限制的假说,但是林线处降水量会影响树木生长与温度的关系。随着青藏高原东北部暖湿化加剧,不同地区林线处树木生长的气候限制因子可能存在复杂化趋势。
英文摘要	Aims To test the hypothesis that water is the main limiting factor of tree growth at the arid alpine timberline, and to explore the effects of water on growth-climate relationships of Sabina przewalskii along a precipitation gradient in the northeast Qinghai-Xizang Plateau. Methods Three sides were selected to sample the alpine timberline along a precipitation gradient in the northeast Qinghai-Xizang Plateau: Halihatu National Forest Park in Wulan County (HL, annual precipitation 217 mm), Qushigang in Dulan County (QS, 281 mm) and Hebei Forest Farm in Tongde County (HB, 470 mm). The correlation and response analysis at seasonal and extreme climate year scales were used to examine the spatial variations of the growth-climate relationship of S. przewalskii at different timberlines. Important findings Our results do not support the hypothesis that water is the main limiting factor of tree growth at the arid alpine timberline. The effect of precipitation on the radial growth of S. przewalskii were consistent across all three sampling sites, while the effects of temperature were different across sites. At HL site (low precipitation), the winter and summer minimum temperature were the main limiting factor of S. przewalskii radial growth, and this relationship did not significantly change in different extreme climate years. At QS site (middle precipitation), the radial growth of S. przewalskii was mainly limited by the minimum temperature in spring and summer, but its effect was weaker than that at low precipitation site. At HB site (high precipitation), the spring temperature had a significant negative effect on tree growth, and the positive effect of spring precipitation on tree growth was significantly enhanced in comparison with those at low and middle precipitation sites, especially in extreme high temperature and drought years. Summer precipitation did not significantly affect tree growth at high precipitation site. Our results did not support the hypothesis that the radial growth of trees at alpine timberline in arid/humid area is mainly limited by water/temperature. However, precipitation at timberline will affect the relationship between tree growth and temperature at different seasons. With the warming and humidification of the northeastern Qinghai-Xizang Plateau, the climatic limiting factors of tree growth in different timberline areas may be complicated.
中文关键词	高山林线 ; 气候限制因子 ; 降水梯度 ; 祁连圆柏 ; 青藏高原 ; 树轮指数
英文关键词	alpine timberline climate limiting factors precipitation gradient Sabina przewalskii Qinghai- Xizang Plateau tree-ring index
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:6208848
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/238621
作者单位	1.东北林业大学林学院生态研究中心, 哈尔滨, 黑龙江 150040, 中国; 2.中国林业科学研究院森林生态环境与保护研究所, 国家林业局森林生态环境重点实验室, 北京 100091, 中国
推荐引用方式 GB/T 7714	宋文琦,朱良军,张旭,等. 青藏高原东北部不同降水梯度下高山林线祁连圆柏径向生长与气候关系的比较[J],2018,42(1):66-77.
APA	宋文琦,朱良军,张旭,王晓春,&张远东.(2018).青藏高原东北部不同降水梯度下高山林线祁连圆柏径向生长与气候关系的比较.植物生态学报,42(1),66-77.
MLA	宋文琦,et al."青藏高原东北部不同降水梯度下高山林线祁连圆柏径向生长与气候关系的比较".植物生态学报 42.1(2018):66-77.