干旱区生态环境知识资源中心(Arid): 花棒茎流对降雨的响应

Arid

	花棒茎流对降雨的响应
其他题名	Rainfall effects on the sap flow of Hedysarum scoparium
	杨强 1; 查天山 1; 贾昕 1; 秦树高 1; 钱多 1; 郭晓楠 1; 陈国鹏 2
来源期刊	应用生态学报
ISSN	1001-9332
出版年	2016
卷号	27 期号:3 页码:761-768
中文摘要	干旱半干旱区植物生理过程的水分响应依赖于降雨强度和频率,研究典型沙生植物对降雨的响应有助于预测未来气候条件下荒漠生态系统的结构和功能变化.2012和2013年花棒生长季,在宁夏盐池采用包裹式茎流仪对花棒茎流进行连续观测,分析茎流在晴天和雨天的变化特征及其对不同降雨事件的响应.结果表明:雨天的花棒日茎流量低于晴天.晴天,茎流日变化呈几字型宽峰曲线,与太阳辐射和相对湿度呈正相关;雨天,茎流日变化呈多峰曲线或者一直处于极低状态,与太阳辐射和空气温度呈正相关.降雨不仅可以通过影响当天太阳辐射、空气温度、饱和蒸汽压差和相对湿度影响花棒茎流通量,还通过调控土壤含水量影响降雨后的茎流通量.降雨量<20 mm时,降雨前后茎流通量差异不显著;降雨量>20 mm时,降雨后的茎流通量比降雨前有显著提高.高土壤含水量不仅能够提高茎流通量,并且能够提高茎流通量对太阳辐射、饱和水汽压差和空气温度的响应敏感性.
英文摘要	In arid and semi-arid areas,plant physiological responses to water availability depend largely on the intensity and frequency of rain events. Knowledge on the responses of xerophytic plants to rain events is important for predicting the structure and functioning of dryland ecosystems under changing climate. The sap flow of Hedysarum scoparium in the Mu Us Sand Land was continuously measured during the growing season of 2012 and 2013. The objectives were to quantify the dynamics of sap flow under different weather conditions,and to examine the responses of sap flow to rain events of different sizes. The results showed that the daily sap flow rates of H. scoparium were lower on rainy days than on clear days. On clear days,the sap flow of H. scoparium showed a midday plateau,and was positively correlated with solar radiation and relative humidity. On rainy days, the sap flow fluctuated at low levels,and was positively correlated with solar radiation and air temperature. Rain events not only affected the sap flow on rainy days through variations in climatic factors(e.g.,solar radiation and air temperature), but also affected post-rainfall sap flow velocities though changes in soil moisture. Small rain events (<20 mm) did not change the sap flow,whereas large rain events (>20 mm) significantly increased the sap flow on days following rainfall. Rainwetted soil conditions not only resulted in higher sap flow velocities,but also enhanced the sensitivity of sap flow to solar radiation,vapor pressure deficit and air temperature.
中文关键词	半干旱区 ; 茎流 ; 降雨 ; 蒸腾 ; 土壤含水量
英文关键词	semi-aridarea sap flow precipitation regime transpiration soil water content
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:5661504
来源机构	北京林业大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/235238
作者单位	1.北京林业大学水土保持学院, 宁夏盐池毛乌素沙地生态系统国家定位观测研究站;;水土保持国家林业局重点实验室, 北京 100083, 中国; 2.甘肃省白龙江林业管理局林业科学研究所, 兰州, 甘肃 730070, 中国
推荐引用方式 GB/T 7714	杨强,查天山,贾昕,等. 花棒茎流对降雨的响应[J]. 北京林业大学,2016,27(3):761-768.
APA	杨强.,查天山.,贾昕.,秦树高.,钱多.,...&陈国鹏.(2016).花棒茎流对降雨的响应.应用生态学报,27(3),761-768.
MLA	杨强,et al."花棒茎流对降雨的响应".应用生态学报 27.3(2016):761-768.