摘要
用TDP茎流计连续测定了沙地樟子松南北两方向的树干液流，并用传感器同步记录环境因子变化，探讨环境因子对树干液流的影响。沙地樟子松树干液流日变化呈双峰有规律变化，南面树干液流速度和变化幅度大于北面树干液流速度和变化幅度；树干液流启动比环境因子晚1小时左右，然后迅速上升，在9：30达到第一个峰值，在17：20左右迅速下降，南面树干液流速度峰值出现在9：30左右，北面峰值出现在13：20左右；通过相关系数分析，树干液流与空气温度、空气相对湿度、太阳辐射和土壤水分相关明显，南北两方向的树干液流受环境因子的影响程度不一样，在南面，太阳辐射〉空气温度〉空气湿度，而在北面空气温度〉太阳辐射〉空气湿度；日树干液流量集中在9：30到17：20，占全天树干液流量的70％多，北面树干液流量是南面树干液流量的0．5～0．6。
By using thermal dissipation probe, sap flow of Pinus sylvestris var. mongolica was measured on south and north side of the tree. At the same time, the circumstance factors were recorded by radiation, temperature and humidity sensor, and relationship between the sap flow velocity（SFV） and the circumstance factors were discussed. The SFV fluctuated with several climax in one day, and the SFV on the south side of the tree was bigger than that on the north side, and its range was wide. One hour after the change of the circumstance factor, the SFV increased quickly and reached first climax at 9：30, and decreased quickly at 17：20. The SFV increased quickly between the SFV beginning to increase and the first climax, and decreased quickly between last climax and SFV being small, and maintained a higher velocity between 9：30 and 17：20. The climax of SFV on the south side occurred at 9：30, and it occurred at 13：20 on the north side. Correlation existed among the SFV, air temperature, air humidity, solar radiation and soil water, but influence of these factors was different to the SFV on the south and north side. On the south side of tree, solar radiation was the most important factor and then air temperature, air humidity, on the north of it, air temperature was the most important factor and then solar radiation, air humidity. The sap flux density between 9：30 and 17：20 was the major in one day, and it was more than 70 percent. The sap flux density on the north side of the tree was 0.5- 0. 6 of that on the south side.
出处
《水土保持研究》
CSCD
北大核心
2006年第4期78-80,共3页
Research of Soil and Water Conservation
基金
国家重大农业节水专项(2002AA2Z4271)部分研究内容
关键词
沙地樟子松
TDP茎流计
树干液流速度
树干液流量
Pinus sylvestris var. mongolica
Thermal Dissipation Probe
Sap flow velocity
Sap flux density
