章古台樟子松树干液流的密度特征

Trunk Sap Flux Density of Pinus sylvestris var. mongolica in Zhanggutai Area

应用热扩散式树干茎流计(TDP)于2010年和2011年4—10月对辽宁省章古台樟子松人工固沙林树干液流密度进行了连续测定,同时测量了空气温度、空气相对湿度、土壤含水量。结果表明:樟子松树干液流密度晴天为单峰曲线,多云天气为多峰曲线,阴天为尖而窄的单峰曲线,雨天基本无液流活动;4—10月液流密度日峰值均值分别为5.12、8.88、10.63、10.06、13.07、12.88、6.59 g·h-1.cm-2,液流密度日均值分别为1.76、3.41、4.48、3.42、4.61、4.23、2.18 g·h-1.cm-2;液流密度与空气温度呈正相关,与空气相对湿度呈负相关,液流密度在土壤含水量波动较大时呈现很大的波动特征;密度为404株.hm-2的32年生樟子松人工固沙林年均单株液流通量约为2 877 kg。

Thermal dissipation probe （TDP） was used to continuously measure the trunk sap flux density of Pirus sylvestris var. mongolica in Zhanggutai area, Liaoning Province, from April to October in 2010 and 2011. Air temperature, relative humidity and soil moisture content were measured. The results show that the diurnal fluctuation curve of sap flux density is a pattern with a single peak in sunny day, many peaks in cloudy day, narrowly single peak in overcast day and little sap flow in rainy day. From April to October, the maximum of diurnal sap flux density are 5.12, 8.88, 10.63, 10.06, 13.07, 12.88 and 6.59 g · h-l · cm-2, while the mean values of diurnal sap flux density are 1.76, 3.41, 4.48, 3.42, 4.61, 4.23 and 2.18 g · h-1 · cm-2, respectively. Trunk sap flux density shows a positive correlation with air temperature, but negative correlation with the relative humidity, and fluctuates with the soil moisture content. The water consumption of P. sylvestris var. mongolica plantation forest （32 year-old and 404 plants/hm2 ） is 2 877 kg per year.