生态学报2017，Vol.37Issue(17)：5591-5601,11.DOI:10.5846/stxb201606141147
念青唐古拉山南坡高寒草甸生产力对温度和降水变化的敏感性及其海拔分异
Altitudinal variations in the sensitivity of alpine meadow productivity to temperature and precipitation changes along the southern slope of Nyainqentanglha Mountains
摘要
Abstract
It remains unclear whether and how the sensitivity of alpine plant growth to climate change may vary with distance away from the altitudinal distribution center of a vegetation type.On the basis of measurements of aboveground net primary productivity (ANPP) in an alpine Kobresia meadow across 7 altitudes along the southern slope of Nyainqentanglha Mountains in Tibet during 2009-2013,we established a linear regression model between ground ANPP and satellite vegetation index (MODIS NDVI).Using the long time-series MODIS NDVI data,we then applied the established model to estimate ANPP in the study area during 2000-2013.In combination with climatic data obtained from altitudinal HOBO weather stations (2006-2013) and Damxung weather station (2000-2013),we aimed to clarify the altitudinal pattem in the sensitivity of ANPP to changes in temperature and precipitation in alpine meadows.A unimodal pattern in multi-year mean ANPP was observed along the altitudes;ANPP increased with increasing altitude up to 4893-4942 m and then decreased,demonstrating the altitudinal distribution center of the alpine meadow at mid-altitude.ANPP was positively correlated with growing season precipitation but negatively correlated with growing season mean air-temperature during 2000-2013.The absolute values of the linear regression slopes (referred to as the sensitivity of ANPP to changes in precipitation and temperature) showed a pattern opposite to the change in ANPP along the altitudes.The precipitation and temperature sensitivities of ANPP were the lowest around the distribution center but higher at lower or higher altitudes with distance away from the distribution center.In conclusion,our data identified the altitudinal pattern in sensitivity of alpine meadow ANPP to climate change with a link to the altitudinal distribution center of the alpine meadow.Such knowledge is important for understanding the response of alpine meadow ecosystems to future climate change in different environments along an altitudinal gradient.关键词
净初级生产力/敏感性/海拔梯度/高寒草甸/气候变化Key words
net primary productivity/sensitivity/altitudinal gradient/alpine meadow/climate change引用本文复制引用
李翔,王忠,赵景学,罗天祥..念青唐古拉山南坡高寒草甸生产力对温度和降水变化的敏感性及其海拔分异[J].生态学报,2017,37(17):5591-5601,11.基金项目
中国科学院先导专项B“青藏高原多圈层相互作用及资源环境效应”子课题(XDB03030402) （XDB03030402）
国家自然科学基金面上项目(31170451) （31170451）
国家973计划课题“全球变化影响下自然生态系统的脆弱性及评价指标”(2010CB951301) （2010CB951301）
