毛乌素沙地沙柳枝条茎流特征
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  • 英文篇名:Characteristics of Stem Flow of Salix psammophila's Branch in Mu Us Sand Land
  • 作者:裴志永 ; 郝少荣 ; 乔敬伟 ; 段广东 ; 王国忠
  • 英文作者:PEI Zhiyong;HAO Shaorong;QIAO Jingwei;DUAN Guangdong;WANG Guozhong;College of Energy and Transportion Engineering of Inner Mongolia Agricultural University;
  • 关键词:毛乌素沙地 ; 沙柳 ; 茎流速率 ; 气象因子 ; 蒸腾
  • 英文关键词:Mu Us Sandland;;Salix psammophila;;sap flow rate;;meteorological factors;;transpiration
  • 中文刊名:TRYJ
  • 英文刊名:Ecology and Environmental Sciences
  • 机构:内蒙古农业大学能源与交通工程学院;
  • 出版日期:2019-01-18
  • 出版单位:生态环境学报
  • 年:2019
  • 期:v.28
  • 基金:国家自然科学基金项目(31400622)
  • 语种:中文;
  • 页:TRYJ201901006
  • 页数:9
  • CN:01
  • ISSN:44-1661/X
  • 分类号:52-60
摘要
为探究沙柳(Salix psammophila)茎流速率和日蒸腾量的变化规律以及环境因子对沙柳茎流速率的影响,选取1龄(1a)、2龄(2 a)和3-5龄(3-5 a)沙柳单枝为研究对象,采用基于热平衡原理的包裹式茎流仪EMS 62和HOBOU30小型气象站对沙柳的茎流速率及其周围的气象因子进行连续同步观测,分析沙柳茎流日变化及气象因子对茎流速率的影响。结果表明,不同天气条件下,不同林龄沙柳的日茎流速率变化规律基本一致,均呈"几"字形曲线。沙柳茎流与太阳辐射(R)、空气温度(t)和水气压差(vp)的变化具有不同步性,两种天气下,夜晚均存在茎流但是白天茎流启动时间不一样。晴天沙柳枝条日累积茎流量表现为3-5 a>2 a>1 a,三者间差异显著;雨天条件下日累积茎流量大小顺序为2 a>3-5 a>1 a,三者间差异不显著。在不同天气情况下,1a和2a沙柳枝条日累积茎流量相差较大,3-5a沙柳日累积茎流量相差较小。沙柳茎流速率与R、t、vp呈显著正相关(P<0.05),与空气相对湿度(RH)呈显著负相关(P<0.05),与风速(ws)相关性模糊;除风速外,沙柳茎流速率与其他气象因子的相关性在晴天条件下的解释效果优于雨天。两种天气情况下,3-5 a沙柳的茎流速率对气象因子更为敏感,且沙柳茎流速率与气象因子均可建立关系模型。文章通过对沙柳茎流的研究,可为确定沙柳合理种植密度等提供参考依据。
        This study aimed to explore the changing rule of stem flow rate and transpiration and the effects of environmental factors to stem flow rate of Salix psammophila. 1-year(1 a), 2-year(2 a) and 3-to-5-year(3-5 a) living Salix psammophila were selected as the research objects. The stem flow rate of Salix psammophila and meteorological factors was observed continuously and synchronously by a stem flow meter EMS 62 which based on the thermal equilibrium principle and HOBO U30 small station. The effects of daily variation of Salix psammophila stem flow and impacting of meteorological factors on the stem flow rate of Salix psammophila was revealed. The results showed that the daily stem flow rate of Salix psammophila of different ages was basically same under different weather conditions, which all were the shape of "几". The change of stem flow of Salix psammophila was different from that of solar radiation(R), air temperature(t) and water vapor pressure difference(vp). There were the stem flow in the evening under both weather conditions, but the starting time was different in the daytime. The amount of Salix psammophila's stem flow of branch decreased gradually on sunny days, which was in the order of 3-5 a>2 a>1 a, there were significant differences among them. The order of transpiration was 2 a> 3-5 a>1 a on rainy days, there were not significant differences among them. Under different weather conditions, the daily cumulative stem flow of 1 a and 2 a Salix psammophila's branch varied greatly, while 3-5 a's varied slightly. The flow rate of Salix psammophila stem was positively correlated with R, t and vp(P<0.05), but negatively correlated(P<0.05) with air humidity(RH), and blurred correlation with wind speed(ws). Sunny days was better than rainy days compared the correlation between sap flow rate and meteorological factors except wind speed. The stem flow rate of 3-5 a Salix psammophila was more sensitive to meteorological factors in both weather conditions. In addition, both the stem flow rate of Salix psammophila and meteorological factors could be established the relational models. This study can provide reference basis for local Salix psammophila's management and determination of reasonable planting density.
引文
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