CAJ | 학술논문

2013年4月至10月,采用热扩散法测定了塔里木河下游阿拉干地区胡杨的树干液流,分析了树干液流与气象因子的关系.研究表明,在极端干旱的塔里木河下游地区,胡杨的树干液流呈单峰曲线型,有明显的昼夜变化规律,树干液流随气象因子变化而波动；胸径为52．06 cm 胡杨的日均液流速率达15．14 L/h；选择典型的晴天7月20日,对胸径32．58,29．13,20．23 cm 胡杨的液流速率进行了监测,平均值分别为15．35,12．44,4．10 L/h,胡杨液流速率和胸径呈正相关关系.同时,胡杨树干液流速率随地下水位的降低而减少.光合有效辐射、风速、气温和相对湿度是影响胡杨树干液流的主要气象因子,光合有效辐射是影响胡杨树干液流的最主要气象因子,可以用光合有效辐射和风速的线性回归模型预测树干液流的变化.胡杨具有极强的环境适应性,随着气温的升高,胡杨加强蒸腾作用,从而降低温度来维持正常的生命活动,胡杨通过大量的水分消耗来抵御高温干燥的沙漠环境.
2013년4월지10월,채용열확산법측정료탑리목하하유아랍간지구호양적수간액류,분석료수간액류여기상인자적관계.연구표명,재겁단간한적탑리목하하유지구,호양적수간액류정단봉곡선형,유명현적주야변화규률,수간액류수기상인자변화이파동；흉경위52．06 cm 호양적일균액류속솔체15．14 L/h；선택전형적청천7월20일,대흉경32．58,29．13,20．23 cm 호양적액류속솔진행료감측,평균치분별위15．35,12．44,4．10 L/h,호양액류속솔화흉경정정상관관계.동시,호양수간액류속솔수지하수위적강저이감소.광합유효복사、풍속、기온화상대습도시영향호양수간액류적주요기상인자,광합유효복사시영향호양수간액류적최주요기상인자,가이용광합유효복사화풍속적선성회귀모형예측수간액류적변화.호양구유겁강적배경괄응성,수착기온적승고,호양가강증등작용,종이강저온도래유지정상적생명활동,호양통과대량적수분소모래저어고온간조적사막배경.
Heat spreading method was used to determine the stem sap flow of Populus euphratica at the lower reaches of Tarim River and analyze the relationships between the stem sap flow environmental fac-tors.The stem sap flow of Populus euphratica presented a single-peaked curve with an obvious day and night variations and fluctuated with variations of environment factors.The average daily sap flow rate of Populus euphratica with a DBH (diameter at breast height)of 52.06 cm was 15.14 L/h.On July 20 of the typical sunny day,the average stem sap flow rate of Populus euphratica with diameter of 32.58 cm, 29.13 cm and 20.23 cm were 15.35 L/h,12.44 L/h and 4.10 L/h,respectively.There is a positive correla-tion between the sap flow rate in stems and the diameter.At the same time,stem sap flow rate of Populus euphratica was decreased with declining groundwater table.The environmental factors,such as PAR (pho-tosynthetically active radiation),wind speed,air temperature and relative humidity were the main factors affacting the stem sap flow rate,and the dynamics of stem sap flow could be predicted by the liner regres-sion model based on PAR and wind speed.Populus euphratica has strong environmental adaptability.Pop-ulus euphratica brings down internal temperature through transpiration to maintain normal life activities when temperature rises.Because of the extremely arid environment,Populus euphratica had a relatively higher stem sap flow rate and a great water consumption.