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DOI	10.1016/j.agrformet.2017.10.029
	Summer solstice marks a seasonal shift in temperature sensitivity of stem growth and nitrogen-use efficiency in cold-limited forests
	Luo, Tianxiang; Liu, Xinsheng; Zhang, Lin; Li, Xiang; Pan, Yude; Wright, Ian J.
通讯作者	Luo, TX (通讯作者)
发表日期	2018
ISSN	0168-1923
EISSN	1873-2240
起始页码	469
结束页码	478
卷号	248
英文摘要	In boreal forests and alpine treelines, it is debatable how the temperature sensitivity of tree-ring growth should vary with changes in climate over time and the extent to which seasonal stem increments are controlled by leaf physiology. We aim to test the hypothesis that, in cold-limited forests, maximizing stem growth rate around summer solstice is closely related to foliage turnover, which generally results in high sensitivity of stem growth and less sensitivity of nitrogen-use efficiency (NUE) to early-season temperatures. Our analysis was based on repeat-census observations of stem radial increment (2008-2013; made with dendrometers) and monthly litterfall (2007-2015) as well as the measurements of tree-ring width series (1960-2015; made with tree-ring cores) in two Tibetan treeline forests. NUE was estimated as the inverse of leaf-litter nitrogen concentration. We further examined a global dataset of tree-ring chronologies (1931-1990) from 139 sites across temperate and boreal coniferous forests in the northern high-latitude region. Weekly stem increments across species and years synchronously peaked around summer solstice, with more than half of annual increment produced in the first 28-35 days of the growing season when air and soil temperatures were still low. Monthly stem increments were positively related to previous-month litterfall, and higher litterfall generally resulted in higher NUE. NUE was insensitive or less sensitive to soil temperature in the early growing season. Among years, pre-peak increments were positively correlated with pre-solstice temperatures while post-peak increments varied little. The annual increment was dominated by and coherent with the pre-peak increment and well correlated with the ring-width measurements of monitored trees during 2008-2013. Variations in tree-ring width chronologies from the two Tibetan treelines and the global 139 forest sites mainly reflected the change of early summer temperatures. The findings suggest a day-length control on the linkage between seasonal stem growth and nitrogen cycling in a cold-limited forest ecosystem, and provide the basic for predicting responses of tree-ring growth and NUE to climatic warming.
关键词	TREE-RING EVIDENCE SERGYEMLA MOUNTAINS CAMBIAL ACTIVITY WHITE SPRUCE CARBON RESPONSES XYLOGENESIS CLIMATE LEAF PRODUCTIVITY
英文关键词	Leaf turnover; Litterfall; Photoperiod; Treeline; Tree-ring growth; Warming
语种	英语
WOS研究方向	Agriculture ; Forestry ; Meteorology & Atmospheric Sciences
WOS类目	Agronomy ; Forestry ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000417659700041
来源期刊	AGRICULTURAL AND FOREST METEOROLOGY
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/259303
推荐引用方式 GB/T 7714	Luo, Tianxiang,Liu, Xinsheng,Zhang, Lin,et al. Summer solstice marks a seasonal shift in temperature sensitivity of stem growth and nitrogen-use efficiency in cold-limited forests[J]. 中国科学院青藏高原研究所,2018,248.
APA	Luo, Tianxiang,Liu, Xinsheng,Zhang, Lin,Li, Xiang,Pan, Yude,&Wright, Ian J..(2018).Summer solstice marks a seasonal shift in temperature sensitivity of stem growth and nitrogen-use efficiency in cold-limited forests.AGRICULTURAL AND FOREST METEOROLOGY,248.
MLA	Luo, Tianxiang,et al."Summer solstice marks a seasonal shift in temperature sensitivity of stem growth and nitrogen-use efficiency in cold-limited forests".AGRICULTURAL AND FOREST METEOROLOGY 248(2018).