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山合欢树干液流的季节变化

王小菲1,2,孙永玉1**,李昆1,张春华1,李彬1   

  1. 1中国林业科学研究院资源昆虫研究所, 昆明 650224; 2西南林业大学环境科学与工程学院, 昆明 650224)
  • 出版日期:2013-03-10 发布日期:2013-03-10

Seasonal dynamics of Albizia kalkora stem sap flow in Yunmou dryhot valley of Southwest China.

WANG Xiao-fei1,2, SUN Yong-yu1**, LI Kun1, ZHANG Chun-hua1, LI Bin1   

  1. (1Research Institute of Insect Resources, Chinese Academy of Forestry, Kunming 650224, China; 2College of Environmental Science and Engineering, Southwest Forestry University, Kunming 650224, China)
  • Online:2013-03-10 Published:2013-03-10

摘要: 于2011—2012年干湿季典型月份,应用热扩散式探针法(TDP)对元谋干热河谷乡土树种山合欢进行了树干液流连续监测,并对周围气象要素、土壤水分等进行同步测定,结果表明:(1)山合欢树干液流存在明显“昼高夜低”的变化规律;(2)在湿季不同天气条件下,山合欢树干液流速率存在明显差异,晴天液流均值、峰值约为阴天2.8和2.4倍,雨天的7.5和7.8倍,3种天气中液流启动时间晴天比阴天早约3 h,比雨天早约4 h;(3)在晴天,山合欢南边液流速率均明显高于北边;而雨天或者无阳光时,南北方位液流速率基本相同;(4)比较山合欢干、湿季典型晴天树干液流峰值、均值、启动时间以及液流通量可知,湿季液流启动时间均早于干季1.5 h左右,液流高峰时间段长于干季,峰值和均值约为干季的1.9和2.3倍;湿季液流通量明显高于干季,约为干季的2.3倍。(5)山合欢液流速率与光合辐射强度、大气温度、水汽压亏缺和风速呈极显著正相关,与相对湿度则呈极显著负相关(P<0.001),气象因子与山合欢树干液流流速的相关性大小依次为:光合有效辐射>水汽压亏缺>大气温度>相对湿度>风速。

关键词: EDTA, GA3, 黑麦草, Pb富集, 亚细胞分布

Abstract: By using thermal dissipation probe (TDP), the sap flow of Albizia kalkora in Yunmou dryhot valley of Southwest China was continuously measured in the typical months of dry and wet seasons in 2011-2012, and the soil moisture content and some meteorological factors such as photosynthetic active radiation (PAR), air temperature (T), atmospheric relative humidity (RH), water vapor pressure deficit (VPD), and wind speed were synchronously measured. The sap flow of the A. kalkora displayed an obvious variation pattern of high at day and low at night. In wet season, the stem flow velocity had obvious difference, with the mean value and peak value in sunny days being 2.8 and 2.4 times of those in cloudy days, and 7.5 times and 7.8 times of those in rainy days, respectively. The starting time of the sap flow in sunny days was about 3 hours earlier than that in cloudy days, and about 4 hours earlier than that in rainy days. In sunny days, the sap flow velocity was obviously higher in south side than in north side; while in cloudy days or rainy days, the sap flow velocity in south side was nearly the same as that in north side. As compared with those in dry season, the starting time of the sap flow in wet season was about 1.5 hours earlier, the peak hours of the sap flow were longer, the mean value and peak value of the sap flow velocity were 1.9 and 2.3 times higher, respectively, and the sap flux was about 2-3 times higher. The sap flow velocity was significantly positively correlated with the PAR, T, VPD, and wind speed, and negatively correlated with atmospheric RH, with the correlation coefficient in the order of PAR > VPD > T > atmospheric RH > wind speed.

Key words: EDTA, GA3, Lolium perenne, Pb accumulation, subcellular distribution.