干旱区生态环境知识资源中心(Arid): 六盘山半干旱区华北落叶松林的生长季蒸散量和组分特征

Arid

	六盘山半干旱区华北落叶松林的生长季蒸散量和组分特征
其他题名	The evapotranspiration and its partition in growing season for a stand of Larix principis-rupprechtii plantation in the semi-arid region of Liupan Mountains, NW China
	李振华; 王彦辉; 于澎涛; 童鸿强; 王艳兵; 刘千
来源期刊	生态环境学报
ISSN	1674-5906
出版年	2013
卷号	22 期号:2 页码:222-228
中文摘要	在宁夏六盘山半干旱区叠叠沟小流域,采用热扩散探针、微型蒸渗仪等在2009-2011年生长季(5-10月份)连续测定了华北落叶松(Larix principis-rupprechtii)人工林的林冠蒸腾、林冠截留及林地蒸散等林分蒸散组分的数量和比例及其月变化。结果表明,2009-2011年的生长季林分蒸散量分别为446、532、426 mm,其年际差别与水分条件、气温和林分叶面积指数有关。蒸散组分中,林冠蒸腾平均占总蒸散的35%、林冠截留占18%、林地蒸散占47%,即53%的蒸散由林冠层产生。林冠月蒸腾在水分充足时主要受饱和水汽压差和太阳辐射影响,在水分缺乏时与诸气象因子相关不显著;其占月蒸散的比例在生长季内持续下降,从5月份最高的51%降到10月份最低的22%。林冠截留的70%集中在雨季7-9月份,其数量与降水量相关紧密;占月蒸散的比例在5、6月份较低(平均11%),在7-10月份较高(21%)。林地蒸散量的季节变化呈单峰型,主要受降水量影响,在8月份最高;其各月占林分蒸散的比例呈持续上升趋势,从5月份最低的32%升到10月份的57%。文中半干旱区林分是典型的水分限制型生态系统,降水量是影响林分蒸散及其组分变化的首要因素。降水类型及其季节分配等其他因素的影响须在短时间尺度上进一步研究。
英文摘要	The canopy transpiration (T), canopy interception (I) and forest floor evapotranspiration (ETf) in a stand of Larix principis-rupprechtii plantation were continuously measured in the growing season (May-October) of 2009-2011, using the techniques including thermal diffusion probes and micro-lysimeters, in a semi-arid small watershed of Diediegou located at the Liupan Mountains of Ningxia Hui Autonomous Region, northwest China. Then, the total stand evapotranspiration (ET), the relative contribution of each ET component and their monthly variation were analyzed. The results showed that the total ET in the growing season of 2009, 2010 and 2011 was 446, 532, 426 mm, respectively; this inter-annual difference was influenced firstly by the water condition, then by the air temperature and stand LAI. Within the stand ET, the T amounted to 35%, while the I and ETf amounted to 18% and 47%, respectively. This meant that 53% of the total stand ET was caused by the stand canopy. The monthly T was mainly constrained by the vapor pressure difference (VPD) and solar radiation when soil water was abundant, but showing no significant relation with the meteorological factors under water deficit condition. The monthly ratio of T/ET decreased gradually in the growing season, from the maximum of 51% in May to the minimum of 22% in October. 70% of I concentrated in the rainy period (July-September), the variation of monthly I was closely dependent on the monthly precipitation. The monthly ratio of I/ET was lower in May and June with an average of 11%; and higher in the period from July to October with an average of 21%. The monthly ETf in the growing season varied in a pattern of single peak which appeared in August. This was mainly determined by the variation of monthly precipitation. However, the monthly ratio of ETf/ET presented an increasing tendency, from 32% in May to 57% in October. This stand with semi-arid climate studied in this paper is a typical water-limited ecosystem, and the precipitation amount played a key role in controlling the amount and partition of stand ET. However, more detailed studies in finer time scale are needed to understand the impacts of other factors, such as the rainfall types, rainfall distribution and so on.
中文关键词	半干旱地区 ; 森林蒸散 ; 组分 ; 蒸腾 ; 截留 ; 蒸发
英文关键词	semi-arid zone forest stand evapotranspiration partitioning transpiration interception evaporation
类型	Article
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:4796914
来源机构	甘肃农业大学 ; 内蒙古农业大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/229952
作者单位	李振华, 中国林业科学研究院森林生态环境与保护研究所, 国家林业局森林生态环境与保护重点实验室, 北京 100091, 中国.; 王彦辉, 中国林业科学研究院森林生态环境与保护研究所, 国家林业局森林生态环境与保护重点实验室, 北京 100091, 中国.; 于澎涛, 中国林业科学研究院森林生态环境与保护研究所, 国家林业局森林生态环境与保护重点实验室, 北京 100091, 中国.; 童鸿强, 江西省宜春市水务局, 国家林业局森林生态环境与保护重点实验室, 宜春, 江西 336000, 中国.; 王艳兵, 内蒙古农业大学林学院, 国家林业局森林生态环境与保护重点实验室, 呼和浩特, 内蒙古 010019, 中国.; 刘千, 甘肃农业大学资源与环境学院, 国家林业局森林生态环境与保护重点实验室, 兰州, 甘肃 730070, 中国.
推荐引用方式 GB/T 7714	李振华,王彦辉,于澎涛,等. 六盘山半干旱区华北落叶松林的生长季蒸散量和组分特征[J]. 甘肃农业大学, 内蒙古农业大学,2013,22(2):222-228.
APA	李振华,王彦辉,于澎涛,童鸿强,王艳兵,&刘千.(2013).六盘山半干旱区华北落叶松林的生长季蒸散量和组分特征.生态环境学报,22(2),222-228.
MLA	李振华,et al."六盘山半干旱区华北落叶松林的生长季蒸散量和组分特征".生态环境学报 22.2(2013):222-228.