准噶尔西部人工碳汇林原生荒漠植被梭梭蒸腾耗水研究

在克拉玛依造林碳汇基地外围,使用包裹式茎流计（Flow4）对梭梭（Haloxylon persicum Bge.）枝液流动态进行了监测;根据生物统计结果选取被测标准枝,标准枝基径在l～3 cm范围内;通过基径断面积和被测枝液流计算丛蒸腾耗水量,通过冠幅最为扩展纯量,利用丛蒸腾耗水量对灌丛群落耗水量进行了尺度转换.结果表明,在转化过程中,梭梭液流速率同枝基径、丛蒸腾耗水量同冠幅具有强相关性;克拉玛依造林碳汇基地蒸腾耗水量的背景值为3.25 t/（d·hm2）;梭梭液流同太阳辐射、光合有效辐射、风速、空气湿度、土壤含水率呈极显著相关,是影响液流变化的主要因子,排列顺序为：光合有效辐射＞太阳辐射＞风速＞土壤含水率＞空气湿度;使用主导因子对梭梭液流通量进行拟合,方程为f=0.024PAR ＋6.859,R2达0.887.

The Research of Transpiration Water-consumption on Original Haloxylon Desert Vegetation around Planted Forest in Arid Region

We measured the sap flow of Haloxylno persicum applying packaged stem sap flow gauge,and choosed normative tress according with 1-3 cm stem base diameter.Through the sectional area of stem base diameter and the sap flow of measurand tress,we calculated clump transpiration of Haloxylno,and obtaining hungriness shrubbery＇ s transpiration through scale transfer by crown width standart.Between the rate of Haloxylno＇ s transpiration and the tress stem base diameter have,clump transpiration and crown width all have prominent relativity too.The background value of carbon sink forest＇ s transpiration in Karamav is 3.25 t/（d · hm2）.The sap flow of Haloxylno has a very significant relation with solar radiation,photosynthetic available radiation,wind speed,air humidity and soil moisture which are the main factors in influencing sap flow in the level of 0.01.The order is：photosynthetic available radiation ＞ solar radiation ＞ wind speed ＞ soil moisture ＞ air humidity.Fitting equations to sap flow using the dominating factor of photosynthetic available radiation,and the equation isf =0.024PAR ＋ 6.859,with R2 =0.887.