干旱区生态环境知识资源中心(Arid): 干旱区杨树、榆树人工防护林地土壤CO

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	干旱区杨树、榆树人工防护林地土壤CO_2释放通量研究
其他题名	Analysis of soil CO_2 efflux in Populus and Ulmus pumila planting shelterbelts in arid region, China
	张丽华 1; 陈亚宁2 ; 赵锐锋 3; 李卫红2 ; 谢忠奎 4
来源期刊	植物生态学报
ISSN	1005-264X
出版年	2010
卷号	34 期号:5 页码:526-534
中文摘要	土壤呼吸是陆地生态系统碳循环的重要组成部分. 随着全球气候变暖趋势逐渐明显,土壤呼吸的时空变异及其对温度变化的响应已成为生态学研究的重要内容之一. 利用LI-8100自动土壤CO_2通量测量系统,连续两年生长季测定了准噶尔盆地新垦绿洲杨树(Populus sp.)、榆树(Ulmus pumila)人工防护林地土壤呼吸的时间动态,并分析了土壤水热因子及光合作用对土壤呼吸的影响. 研究结果表明:两种林分土壤呼吸日变化波动呈现一定的不规则性;季节变化表现为明显的单峰格局. 杨树林地土壤呼吸速率显著高于榆树林地,生长季平均土壤呼吸速率分别为3.71和1.82mumol CO_2·m~(-2)·s~(-1). 两种林分土壤呼吸的季节变化与气温、不同深度层次土壤温度间均呈显著的指数相关,而与土壤含水量之间相关不显著. 50和35 cm土壤温度可以分别解释两种林分土壤呼吸时间变化的78.5%和64.4%,与土壤温度和含水量的共同解释率接近. 林分间土壤呼吸速率差异受到林木生长状况、光合作用及土壤盐分等的影响. 研究结果初步阐明了准噶尔盆地干旱区典型绿洲防护林植被土壤呼吸的季节动态特征及主要影响因子,为进一步揭示该区域林地土壤碳循环特点提供了一定的理论基础
英文摘要	Aims Our objective was to examine the effects of temperature, soil water content and photosynthesis on soil respiration in Populus and Ulmus pumila planting shelterbelts in China’s Junngar Basin. Methods Soil respiration was measured during the growing seasons in 2005 and 2006 using an automated CO_2 efflux system(LI-8100).Air temperature(at 50 cm in height)and soil temperature(every 5 cm from 0 to 50 cm depth)were monitored at three points adjacent to the chamber using a digital thermometer(WMY-01C, Huachen Medical Instrument Inc., Shanghai, China)at each site. Gravimetric soil moisture at 0-5,5-15,15-30, and 30-50 cm depths at three points were measured using the oven-drying method at 105°C for 48 h. Important findings Soil respiration displayed irregular fluctuation of daytime pattern and significant single-peaked curve of seasonal pattern in the two woodlands. Seasonally, soil respiration was characterized by a maximum in July or August and a minimum in October or May, following the change of soil temperature. The rate of soil respiration was significantly higher in Populus woodland than that in U.pumila woodland with mean rates of 3.71 and 1.82mumol CO_2·m~(-2)·s~(-1) in two growing seasons, respectively. Soil respiration was significantly correlated with temperature in exponential equation, but uncorrelated with soil water content in the two woodlands. Soil temperature at 50 and 30 cm depths could explain 78.5%and 64.4%of seasonal variations of soil respiration in Populus woodland and U.pumila woodland, respectively, which confirms the common explanation by temperature and soil water content. The difference in soil respiration between the woodlands was influenced by growth state of trees, photosynthesis and soil salinity. Our results suggested that there was significant seasonal variation of soil respiration in oasis shelterbelts in the arid region and soil temperature was the main regulating factor
中文关键词	水热因子 ; 防护林 ; 土壤碳循环 ; 温带荒漠区 ; 新疆
英文关键词	hydrothermal factor planting shelterbelts soil carbon cycle temperate desert area Xinjiang
语种	中文
国家	中国
收录类别	CSCD
WOS类目	PLANT SCIENCES
WOS研究方向	Plant Sciences
CSCD记录号	CSCD:3938517
来源机构	中国科学院新疆生态与地理研究所 ; 西北师范大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/225895
作者单位	1.中国科学院寒区旱区环境与工程研究所皋兰生态与农业综合试验站, 中国科学院绿洲生态与荒漠环境重点实验室, 兰州, 甘肃 730000, 中国; 2.中国科学院新疆生态与地理研究所, 中国科学院绿洲生态与荒漠环境重点实验室, 乌鲁木齐, 新疆 830011, 中国; 3.西北师范大学地理与环境科学学院, 兰州, 甘肃 730070, 中国; 4.中国科学院寒区旱区环境与工程研究所皋兰生态与农业综合试验站, 兰州, 甘肃 730000, 中国
推荐引用方式 GB/T 7714	张丽华,陈亚宁,赵锐锋,等. 干旱区杨树、榆树人工防护林地土壤CO_2释放通量研究[J]. 中国科学院新疆生态与地理研究所, 西北师范大学,2010,34(5):526-534.
APA	张丽华,陈亚宁,赵锐锋,李卫红,&谢忠奎.(2010).干旱区杨树、榆树人工防护林地土壤CO_2释放通量研究.植物生态学报,34(5),526-534.
MLA	张丽华,et al."干旱区杨树、榆树人工防护林地土壤CO_2释放通量研究".植物生态学报 34.5(2010):526-534.