青海湖流域泥炭湿地地气系统不同时间尺度上CO_(2)交换特征  

Characteristics of CO_(2) exchange on different time scales of peat wetland land-atmosphere system in Qinghai Lake basin

作　　者：左弟召 陈克龙[2,3] 李英年[4] 张法伟[4] ZUO Dizhao;CHEN Kelong;LI Yingnian;ZHANG Fawei(College of Geographical Sciences,Qinghai Normal University,Xining 810008,China;MOE Key Laboratory of Tibet Plateau Land Surface Process and Ecological Conservation,Xining 810008,China;Qinghai Province Key Laboratory of Physical Geography and Environmental Process,Xining 810008,China;Northwest Institute of Plateau Biology,Chinese Academy of Sciences,Xining 810008,China)

机构地区：[1]青海师范大学地理科学学院,青海西宁810008 [2]青海师范大学青藏高原地表过程与生态保育教育部重点实验室,青海西宁810008 [3]青海师范大学青海省自然地理与环境过程重点实验室,青海西宁810008 [4]中国科学院西北高原生物研究所,青海西宁810008

出　　处：《生态科学》2022年第2期174-183,共10页Ecological Science

基　　金：国家重点研发计划项目(2017YFC0403601);国家自然科学基金项目(41661023);青海省科技厅项目(2017-ZJ-782,2018-ZJ-T09)。

摘　　要：为了定量分析2017年青海湖流域泥炭湿地地气系统不同时间尺度上的碳交换的变化特征及影响机制,利用涡动相关技术对其不同时间尺度上的碳通量进行了测定,结果表明:(1)青海湖流域泥炭湿地地气系统在2017年表现为“碳源”,全年合计排放209.312 gC·m^(–2)。(2)生态系统总初级生产量(GPP)和生态系统总呼吸(Re)年变化均呈倒V型,而净生态系统碳交换(NEE)年内变化则呈双峰型。(3)NEE和GPP与各环境要素(气温、土壤温度、月平均降水量、土壤含水量)呈现负相关关系,而Re与之呈显著的正相关关系(P<0.01)。(4)NEE受温度因子影响较大,主要受控于气温。(5)GPP和Re与各水热因子都有较大的相关性,但GPP受温度因子影响较显著,而水、热季节变化及其协调程度对Re有更大的影响。In order to quantitatively analyze the carbon exchange change characteristics and impact mechanism of the land-atmosphere system of peat wetland on the Qinghai Lake basin at different time scales in 2017,this paper used eddy covariance technique to measure its carbon flux on different time scales.The results showed that:(1)The land-atmosphere system of peat wetland in Qinghai Lake Basin behaved as a"carbon source"in 2017,with a total annual emission of 209.312 gC·m^(-2).(2)The annual variation of gross primary productivity(GPP)and ecosystem respiration(Re)of the system were both inverted V type,while the annual variation of net ecosystem exchange(NEE)was bimodal pattern.(3)NEE and GPP had a negative correlation with various environmental factors(air temperature,soil temperature,monthly average precipitation,and soil water content),but Re had a significant positive correlation with them(P<0.01).(4)NEE was greatly affected by temperature factors and was mainly controlled by air temperature.(5)Both GPP and Re had greater correlations with various hydrothermal factors,but GPP was significantly affected by temperature factors,while the seasonal changes in water and heat and their coordination degree had a greater impact on Re.

关 键 词：泥炭湿地 涡度相关 碳通量 青藏高原 

分 类 号：S157.2[农业科学—土壤学]