干旱区生态环境知识资源中心(Arid): 荒漠绿洲农田防护树种二白杨生长季节树干液流的变化

Arid

	荒漠绿洲农田防护树种二白杨生长季节树干液流的变化
其他题名	Sap flow of Gansu poplar in farmland shelter forest during the growing season in desert oasis
	常学向; 赵文智
来源期刊	生态学报
ISSN	1000-0933
出版年	2004
卷号	24 期号:7 页码:1436-1441
中文摘要	热脉冲技术已经成为确定林木耗水的有力工具.利用澳大利亚GREENSPAN技术公司SF-300热脉冲树干液流仪,在生长季节对荒漠绿洲区农田防护树种二白杨树干液流速率进行了连续观测,结果表明:二白杨树干液流速率的日变化规律为,夜间液流速率较低,其中最低值出现在2:00～3:00,7:00～8:30开始升高,13:00～14:00达到最大值,16:00～18:30开始下降;树干液流速率日平均值介于10 .14.9g/(cm2?h)～23.38.2g/(cm2?h)之间.二白杨树干液流速率8月份最高 ,7月份次之,5月与9月份基本一致.树干液流与边材面积、叶面积指数呈显著线性相关, 而与胸径、胸径平方与树高之积呈复合指数函数关系,与冠层厚度呈三次幂函数关系.
英文摘要	The Gansu Poplar (Populus gcmsuensis C. Wang et H. L. Yang ) shelter forest farmland play an important role in protecting and improving in the middle Heihe basin. It covers the area of about 18000 hectares and shelters farmland of 66700 hectares against damages of sandstorm and dry thermal wind. Understanding of water consumption in artificial Gansu Poplar forest is critical for assessing the balancing relation between the ecological function of artificial forest and the consumption of water resources. The heat pulse technique was considered as an effective method for measuring sap flow and transpiration of plant individual, and in turn, assessing water consumption. We used the heat pulse meter (SF-300, Greenspan technology Pty Ltd., Australian) to measure sap flow of Gansu Poplar individual. The objective is to specify the individual variability of sap flow and to determine water consumption by transpiration. The experimental site is located in the middle of Heihe basin, at Pinchuan town in Linze county, Gansu province (100°07’E, 39°21’N). According to different size of stem classes, 8 standard trees of Gansu Poplar were selected as sample plant, which were planted in 1983. Sap flow was measured by heat pulses lasting 1. 6 seconds every 30 minutes from Apr. 20 to May. 21 and from 11th to 21st in July, Aug. , and Sept. , 2003, respectively. Green leaf area of a sub-sample of leaves per tree was measured every 5 days from Apr. 23 to Julyl5 using a leaf area meter (model LI-3000, Li-Cor Inc. , Lincolnj NE). Total green leaf area was estimated by multiplying leaf area measured by the ratio between the fresh leave weight of the sub-sample and total-sample. During the growing season, the diurnal sap flow velocity of Gansu Poplar was lower at night, with lowest at 2:00～3:00, and started to rise rapidly during 7:OO～8:3O, and then descend during 16:00～18:30. The maximum of sap flow velocity appears during 13:00～14:00. The maximum of average velocity of the sap flow occurred in August, and the second was in July, and the third was in May and in September. And it was basically consistent in May and September. The diurnal average sap flow velocity was between 10. 14. 9g/(cm~2 · h) and 23. 38. 2g/(cm~2 · h). The average cumulative sap flow showed a strong correlation of compound exponential with diameter breast height (DBH) and (DBH)~2 H, respectively, and a cubic function relationship with canopy thickness, and a linear correlation with sapwood area and leaf area index, respectively.
中文关键词	树干液流 ; 叶面积指数 ; 生长季节 ; 二白杨 ; 农田防护林 ; 荒漠绿洲
英文关键词	sap flow leaf area index during growing season Gansu Poplar farmland shelter forest desert oasis
语种	中文
国家	中国
收录类别	CSCD
WOS类目	FORESTRY
WOS研究方向	Forestry
CSCD记录号	CSCD:1587902
来源机构	中国科学院西北生态环境资源研究院
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/205366
作者单位	中国科学院寒区旱区环境与工程研究所,临泽内陆河流域综合研究站, 兰州, 甘肃 730000, 中国
推荐引用方式 GB/T 7714	常学向,赵文智. 荒漠绿洲农田防护树种二白杨生长季节树干液流的变化[J]. 中国科学院西北生态环境资源研究院,2004,24(7):1436-1441.
APA	常学向,&赵文智.(2004).荒漠绿洲农田防护树种二白杨生长季节树干液流的变化.生态学报,24(7),1436-1441.
MLA	常学向,et al."荒漠绿洲农田防护树种二白杨生长季节树干液流的变化".生态学报 24.7(2004):1436-1441.