干旱区生态环境知识资源中心(Arid): 亚洲中部干旱区3个典型生态系统生长季水碳通量特征

Arid

	亚洲中部干旱区3个典型生态系统生长季水碳通量特征
其他题名	Characteristics of water and carbon fluxes during growing season in three typical arid ecosystems in central Asia
	王玉辉; 井长青; 白洁; 李龙辉; 陈曦; 罗格平
来源期刊	植物生态学报
ISSN	1005-264X
出版年	2014
卷号	38 期号:8 页码:795-808
中文摘要	亚洲中部干旱区地处欧亚大陆腹地, 干旱少雨, 生态环境十分脆弱, 研究该地区大气与地表之间的能量和物质交换对干旱区水资源利用和生态环境保护具有重要意义。该文分析了亚洲中部干旱区荒漠与草地生态系统能量、水汽和CO_2通量的日变化及季节变化特征, 探究了水汽和CO_2通量对主要环境因子的响应。通过分析亚洲中部干旱区3个站点的涡度相关资料发现: 亚洲中部干旱区荒漠和草地生态系统在生长季(4-10月)能量、水汽通量、净CO_2通量和总初级生产力的日变化呈"单峰型", 而荒漠生态系统呼吸日变化相对稳定; 草地生态系统白天的潜热通量占净辐射通量的比例明显高于荒漠生态系统; 草地生态系统在5-8月呈现较强的碳汇, 而荒漠生态系统表现为弱碳汇。亚洲中部干旱区草地和荒漠生态系统水汽通量和总初级生产力对降水、净辐射通量或光合有效辐射、饱和水汽压差、气温均表现出明显的敏感性。
英文摘要	Aims The arid region in central Asia, in the hinterland of Eurasia, is characterized by low precipitation and extremely fragile ecological environment. Study of energy and matter exchange between atmosphere and the land surface is essential to understanding the balance of water resources and ecosystem functioning in arid region. The objective of this study was to investigate the characteristics of water and carbon fluxes and responses to environmental factors in a typical ecosystem of central Asia. Methods Eddy covariance measurements were made at three sites representing desert and grassland ecosystems in the central Asia. We analyzed the responses of evaporation and gross primary productivity to selective environmental factors using the enveloped curve fitting method, which determines the response of a dependent variable to a given independent factor while fixing other factors at their best values. Important findings During growing season from April to October, the diurnal variations of energy, water vapor, net ecosystem CO_2 exchange and gross primary productivity showed patterns of "single peak curve" at the three sites; whereas ecosystem respiration in the desert ecosystem kept relatively stable. The ratio of latent heat flux to net solar radiation in the grassland ecosystem (76.3%) was greater than in the desert ecosystem (32.7%). The grassland ecosystem occurred as a strong carbon sink, whilst the desert ecosystem showed weak carbon fixation. Evapotranspiration and gross primary productivity in the two types of ecosystems were susceptible to changes in precipitation, net solar radiation or photosynthetically active radiation, vapor pressure deficit and air temperature.
中文关键词	亚洲中部干旱区 ; CO_2通量 ; 涡度相关 ; 能量通量 ; 水汽通量
英文关键词	central areas of Asia CO_2 flux eddy covariance energy flux vapor flux
语种	中文
国家	中国
收录类别	CSCD
WOS类目	BIOLOGY
WOS研究方向	Life Sciences & Biomedicine - Other Topics
CSCD记录号	CSCD:5215162
来源机构	中国科学院新疆生态与地理研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/232021
作者单位	中国科学院新疆生态与地理研究所, 荒漠与绿洲生态国家重点实验室, 乌鲁木齐, 新疆 830011, 中国
推荐引用方式 GB/T 7714	王玉辉,井长青,白洁,等. 亚洲中部干旱区3个典型生态系统生长季水碳通量特征[J]. 中国科学院新疆生态与地理研究所,2014,38(8):795-808.
APA	王玉辉,井长青,白洁,李龙辉,陈曦,&罗格平.(2014).亚洲中部干旱区3个典型生态系统生长季水碳通量特征.植物生态学报,38(8),795-808.
MLA	王玉辉,et al."亚洲中部干旱区3个典型生态系统生长季水碳通量特征".植物生态学报 38.8(2014):795-808.