干旱区生态环境知识资源中心(Arid): 甘肃民勤地区不同地下水埋深花棒蒸腾耗水研究

Arid

	甘肃民勤地区不同地下水埋深花棒蒸腾耗水研究
其他题名	Tree-scale transpiration dynamics of Hedysarum scoparium in response to growth stage, groundwater table depth, and climate in a semi-arid environment in northwestern China
	张志强 1; 王盛萍 1; 贾宝全 2; 赵明 3
来源期刊	生态学报
ISSN	1000-0933
出版年	2004
卷号	24 期号:4 页码:736-742
中文摘要	采用非称重式地下水恒位补偿蒸渗仪稳定供水系统、气候观测、土壤含水量测定等方法,研究了1995年分别定植于地下水埋深为1.6m、2.6m和3.6m蒸渗仪栽培池中的1年生花棒(Hedysarum scoparium)从1995年至2000年单株的蒸腾耗水规律.结果表明:(1)花棒不同生长阶段(年龄)蒸腾耗水对地下水埋深具有不同的响应特点.1年生花棒2.6m和3.6m地下水埋深条件下蒸腾量分别比1.6m高出188.35mm和113.7mm;4年生花棒蒸腾耗水量比1年生有显著增长,1.6m、2.6m和3.6m地下水埋深的花棒蒸腾量分别为440.96mm、397.78mm和471.88mm,较1年生增长了3.5倍、0.39倍和1.2倍;6年生各地下水埋深蒸腾量有不同程度的下降或稳定趋势,2.6m和3.6m埋深分别比4年生下降了16.3%和36.7%,而1.6m埋深几乎不变;(2)生长季花棒蒸腾耗水占全年蒸腾量的绝大部分,但由于受气候、不同生长阶段植物生理生态以及土壤含水量分布等的影响,各水位1年生和6年生花棒生长季蒸腾耗水主要集中在径生长期(7～8月份),而4年生花棒各水位条件下生长季不同阶段蒸腾耗水相差不大,同一生长季内各水位间的蒸腾耗相差较小;(3)生长季花棒蒸腾耗水量与环境因子单因素关系分析表明,不同地下水埋深条件下花棒蒸腾耗水主要相关因子不尽相同,但其机理仍需进一步研究.
英文摘要	Natural precipitation is often limited and groundwater can be a very important water source for vegetation reestablishment and growth in the dryland regions. Therefore, quantifying water use by plant transpiration under different ground water tables helps to understand responsive mechanism of plant growth to various ground water regimes. One year-old seedlings of Hedysarum scoparium were planted in 1995 and single tree transpiration dynamics under constant water tables of 1.6 m, 2.6 mt and 3.6 m were measured during 1995~2000 using non-weighing constant water table lysimeters. Three replications for the lysimeters with 1.6 m water table depth, and four for lysimeters with 2.6 m and 3.6 m water table depths were employed for transpiration measurement while two replications were used for bared soil evaporation measurements only under each of the three water table depths. Tree transpiration was estimated as the difference between water losses from the lysimeters with tree and without tree. In addition, climatic factors such as precipitation, wind speed, relative humidity, sunshine hours, and soil moisture content were measured. This study suggested that transpirations of Hedysarum scoparium varied significantly in response to groundwater table depth and plant ages. For the 1 year old Hedysarum scoparium, annual transpiration water loss under the 2.6m, 3.6m water table cases were estimated as 188. 4mm and 113.7 mm higher when the water table depth was set as 2.6m, 3.6m than that when the water table depth was set as 1.6 m, respectively. The transpiration rates of the 4 year old trees under the 1.6m, 2.6 m, and 3.6m water table condition were 441.0 mm, 397.8 mm, and 471.9 mm respectively. When compared to the 1 year old trees under the same water table conditions, these transpiration rates represent 3.5, 0.4, and 1.2 folds increases, respectively. However, transpirations of the 6 year old trees under the 1.6 m, 2.6 m and 3.6 m water table regimes became unchanged, decreased by 16.3%, and 36.7%, respectively, when compared to the 4 year old trees under the same water table conditions. This study also found that transpiration in the growing season accounted for most of the annual plan water losses, and seasonal plant transpiration varied greatly due to differences in plant age, climatic variations, and plant ecophysiological characteristics. During the diameter growth season from July to August, transpiration of the 1 year old and 6 year old trees accounted for 39.2% to 62.7% from the whole year. However, transpiration rates of the 4 year old trees did not have much variations (1.9%～4.5%) during the May~June, July~August, and September-October, time periods. Regression analysis suggested that the relationships between growing season transpiration and environmental factors varied with different water table conditions. The combined effects of groundwater table depth and environmental factors on plant transpiration dynamics remained unclear.
中文关键词	花棒 ; 非称重式地下水恒位补偿蒸渗仪 ; 蒸腾耗水量 ; 动态变化
英文关键词	Hedysarum scoparium non-weighing constant water table lysimeter transpiration water use
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:1613752
来源机构	北京林业大学 ; 甘肃省治沙研究所 ; 中国林业科学研究院林业研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/205348
作者单位	1.北京林业大学, 水土保持与荒漠化防治教育部重点实验室, 北京 100083, 中国; 2.中国林业科学研究院林业研究所, 北京 100091, 中国; 3.甘肃省治沙研究所, 武威, 甘肃 733000, 中国
推荐引用方式 GB/T 7714	张志强,王盛萍,贾宝全,等. 甘肃民勤地区不同地下水埋深花棒蒸腾耗水研究[J]. 北京林业大学, 甘肃省治沙研究所, 中国林业科学研究院林业研究所,2004,24(4):736-742.
APA	张志强,王盛萍,贾宝全,&赵明.(2004).甘肃民勤地区不同地下水埋深花棒蒸腾耗水研究.生态学报,24(4),736-742.
MLA	张志强,et al."甘肃民勤地区不同地下水埋深花棒蒸腾耗水研究".生态学报 24.4(2004):736-742.