青海海北高寒嵩草草甸系统水分利用效率特征
发布时间：2019-01-23 20:33
【摘要】：系统水分利用效率(WUE)是高寒草甸生态系统碳水耦合及植被演替的重要指标,但其时间格局和主要环境因素仍不清楚。基于青藏高原东北隅高寒嵩草草甸的涡度相关仪器观测的CO_2和H_2O通量数据,分析了2015年植被生长季(4月-10月)的系统水分利用效率(总初级生产力/植被蒸腾)的变化特征和主要环境影响因子。结果表明,总初级生产力(GPP)和植被蒸腾具有显著的单峰季节趋势,与群落叶面积指数(LAI)显著相关。生长季日均WUE为3.24g C·kg H_2O~(-1),没有显著的季节动态,呈现出"保守型"的特征。增强回归树的结果表明光合光量子通量密度(PPFD)、饱和水汽压差(VPD)和净辐射(Rn)是其主要调控因素,与WUE显著指数负相关(r~20.40,p0.001)。
[Abstract]:Water use efficiency (WUE) is an important indicator of carbon / water coupling and vegetation succession in alpine meadow ecosystem, but its time pattern and main environmental factors are still unclear. Based on the CO_2 and H _ 2O fluxes observed by the vorticity correlation instrument in the alpine Kobresia humilis meadow in the northeast part of the Qinghai-Xizang Plateau, The variation characteristics of water use efficiency (total primary productivity / vegetation transpiration) and the main environmental impact factors in the vegetation growth season (April-October) in 2015 were analyzed. The results showed that total primary productivity (GPP) and vegetation transpiration had a significant single peak seasonal trend, which was significantly correlated with the area index (LAI). The average daily WUE of growing season is 3.24g C kg H _ 2O-1, and there is no significant seasonal dynamic, which shows the characteristic of "conservative". The results of enhanced regression tree showed that (PPFD), saturated water vapor pressure difference (VPD) and net radiation (Rn) (Rn) were the main regulatory factors, which were negatively correlated with the significant index of WUE (r = 20.40p 0.001).
【作者单位】： 青海省工程咨询中心;中国科学院西北高原生物研究所高原生物进化与适应重点实验室;中国科学院地理科学与资源研究所生态系统网络观测与模拟重点实验室;中国科学院大学;
【基金】：青海省国际科技合作项目(2015-HZ-804) 国家自然科学基金项目(31270520;31300385;31270523) 中国科学院战略性先导科技专项(XDB03030502)资助
【分类号】：S812
[Abstract]:Water use efficiency (WUE) is an important indicator of carbon / water coupling and vegetation succession in alpine meadow ecosystem, but its time pattern and main environmental factors are still unclear. Based on the CO_2 and H _ 2O fluxes observed by the vorticity correlation instrument in the alpine Kobresia humilis meadow in the northeast part of the Qinghai-Xizang Plateau, The variation characteristics of water use efficiency (total primary productivity / vegetation transpiration) and the main environmental impact factors in the vegetation growth season (April-October) in 2015 were analyzed. The results showed that total primary productivity (GPP) and vegetation transpiration had a significant single peak seasonal trend, which was significantly correlated with the area index (LAI). The average daily WUE of growing season is 3.24g C kg H _ 2O-1, and there is no significant seasonal dynamic, which shows the characteristic of "conservative". The results of enhanced regression tree showed that (PPFD), saturated water vapor pressure difference (VPD) and net radiation (Rn) (Rn) were the main regulatory factors, which were negatively correlated with the significant index of WUE (r = 20.40p 0.001).
【作者单位】： 青海省工程咨询中心;中国科学院西北高原生物研究所高原生物进化与适应重点实验室;中国科学院地理科学与资源研究所生态系统网络观测与模拟重点实验室;中国科学院大学;
【基金】：青海省国际科技合作项目(2015-HZ-804) 国家自然科学基金项目(31270520;31300385;31270523) 中国科学院战略性先导科技专项(XDB03030502)资助
【分类号】：S812
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