【摘要】 2004年5~10月,通过测定青海大通一块退耕地上17年生的青海云杉和华北落叶松混交林树木蒸腾速率的日变化、月变化动态规律以及树木蒸腾总面积来确定混交林的蒸腾量,根据植物的蒸腾量估算树木在生长季的耗水量,进而推算出林地蒸散和水量平衡。研究表明,青海云杉、华北落叶松混交林生长季林地总蒸散量为251.80 mm,以林木的蒸发散为主,占总蒸散量的80%,占同期降雨量的58%;灌草蒸散占总蒸散的13%;而土壤蒸发仅为25.71 mm,占总蒸散的7%。更多还原

【Abstract】 From May to October of 2004,based on the measurements of the diurnal and monthly transpiration rate,the evapotranspiration of a 17-year old Picea asperata Mast.and Larix gmeini Rupr mixed stand can be calculated through the transpiration area of trees in Datong County Qinghai Province.The water consumption of trees in the growing seasons can be reckoned through the evapotranspiration of plants,and the forestland evapotranspiration and water balance can be computed.The main results are as follows: Firstly,the total evapotranspiration of Picea asperata Mast.and Larix gmeini Rupr mixed stand in the growing seasons was 251.80 mm,the evapotranspiration of trees to the total field evapotranspiration and rainfall at the same period accounted for 80% and 58%.Secondly,the evapotranspiration of shrub and herb to the total field evapotranspiration accounted for 13%.Thirdly,the soil evaporation was 25.71 mm,accounting for 7% of the total evapotranspiration.更多还原