Temperature change along elevation and its effect on the alpine timberline tree growth in the southeast of the Tibetan Plateau  

作　　者：CHEN Bao-Xiong SUN Yu-Fang ZHANG Hong-Bin HAN Zhi-Hua WANG Jing-Sheng LI Yao-Kui YANG Xiao-Lin 

机构地区：[1]Rural Energy & Environment Agency, Ministry of Agriculture and Rural Affairs of the People's Republic of China, Beijing 100125, China [2]National Defense Examination Center, Beijing 100082, China [3]Lhasa Plateau Ecosystem Research Station, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Science, Beijing 100101,China [4]Tibet Agricultural and Animal Husbandry College, Linzhi 860000, China

出　　处：《Advances in Climate Change Research》2018年第3期185-191,共7页气候变化研究进展（英文版）

摘　　要：Smith fir （Abies georgei var. smithii）, which is the timberline constructive tree species in the cool slope of Mt. Sygera in the southeast ofTibet, plays a very important role in maintaining the timberline completeness and indicating global climate change. This study uses theinstrumental recorded meteorological data along the altitude from 3600 to 4400 m at every 200 m in the growing season, investigates the smithfir growth biomass from 2006 to 2010 in the same timberline ecotone, and makes a non-linear regression analysis to determine the relationshipbetween the alpine tree growth biomass and its in-situ environment condition. The results showed that the cool and warm slope share different airtemperature lapse rates, which were
0.48 C （100 m）
1 in the warm slope and
0.54 C （100 m）
1 in the cool slope, respectively. However, thedominant timberline tree species in the warm slope was Sabina saltuaria, and it can reach as high as 4570 m, which is approximately 170 mhigher than that in the cool slope. Moreover, the smith fir in the cool slope was only distributed in the range of elevation from approximately3600 to 4400 m. The altitude of approximately 3800 m was the appropriate altitude for the growing smith fir, where the mean air temperature inthe growing season was about 9.0 C, and the young smith fir tree can form more biomass. The results suggested that alpine forest chose asuitable environment where trees can grow more in the prolonged succession, but not in the warmer or cooler condition, it could be seen as abiological evidence for climate change.

关 键 词：ABIES georgei VAR. smithii Growth biomass SABINA saltuaria In-situ environment condition Non-linear regression analysis 

分 类 号：P[天文地球]