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采用涡度相关技术对安吉亚热带毛竹林生态系统碳通量进行连续观测,选取2011和2013年月尺度净生态系统生产力(NEP)、生态系统呼吸(Re)和总生态系统生产力(GEP)数据,探讨季节性高温、干旱对毛竹林生态系统碳通量的影响.结果表明:安吉毛竹林年际间NEP有较大差异;2013年7和8月由于水热不同步而造成的高温干旱使其NEP明显下降,相比于2011年同期分别下降了59.9%和80.0%.对2011和2013年月尺度下NEP、Re和GEP与环境因子进行相关分析发现,Re和GEP与温度因子均呈显著相关(P<0.05),但两者对空气和土壤水分的响应方式和程度有所不同,GEP相比于Re更易受到土壤水分降低的影响,而饱和水汽压差的升高会在一定程度上促进Re、同时抑制GEP,这是造成2013年7和8月安吉毛竹林NEP降低的根本原因.
Using the eddy covariance technique to continuously monitor carbon fluxes in the Angiolina pubescens ecosystem, the monthly and monthly net ecosystem productivity (NEP), ecosystem respiration (Re) and total ecosystem productivity (GEP) data of 2011 and 2013 were selected. The effects of seasonal high temperature and drought on the carbon fluxes of Phyllostachys heterocycla cv. Pubescens forest were studied.The results showed that the NEPs of Phyllostachys pubescens forest were significantly different in the interannual years and that in July and August of 2013 caused by high temperature and drought NEP decreased significantly, down 59.9% and 80.0% respectively compared with the same period of 2011. Correlation analysis of NEP, Re and GEP with environmental factors at the monthly scale of 2011 and 2013 showed that Re and GEP were significantly correlated with temperature factors (P <0.05). However, the responses of both to air and soil moisture were different. GEP was more affected by soil moisture than Re, and the increase of saturated water vapor pressure difference would be promoted to a certain extent Re and GEP at the same time, which is the root cause of the decrease of NEP in Angie bamboo forest in July and August of 2013.