不同供水条件下侧柏和刺槐幼树的蒸腾耗水与土壤水分应力订正  

Transpiration water consumption of young Platycladus orientalis and Robinia pseudoacacia trees and their correction functions under different water supply

作　　者：王进鑫[1] 黄宝龙[2] 王明春[1] 王迪海[1] 

机构地区：[1]西北农林科技大学资源环境学院,杨凌712100 [2]南京林业大学森林资源与环境学院,南京210037

出　　处：《应用生态学报》2005年第3期419-425,共7页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金项目 ( 30 371 1 5 1 );教育部科学技术研究重点项目;西北农林科技大学重点科研基金资助项目 ( 0 80 80 0 ) .

摘　　要：采用旱棚人工控水 ,对侧柏、刺槐不同水量全生长期均衡供水条件下 ,2～ 3年生幼树的生理需水规律、蒸腾耗水与土壤水分的关系进行了研究 .结果表明 ,刺槐蒸腾耗水量随土壤供水能力的增大而增加 .其中以生长前期和生长盛期耗水为主 ,约占年蒸腾耗水量的 80 5% ;刺槐年均生理需水量是侧柏的 5 1 3倍 .侧柏蒸腾耗水量在土壤相对含水率为 4 0 %～ 1 0 0 %有一峰值 .当土壤相对含水率≤ 87 84 %时 ,蒸腾耗水量随土壤相对含水率增加而增大 ;反之则减小 .侧柏蒸腾耗水量以生长盛期最大 ,约占年蒸腾量的4 6 2 7% ,生长后期次之 ,生长前期较小 .并求出了两树种蒸腾耗水的土壤水分应力订正函数及在非充分供水条件下实际蒸腾耗水的时间 水分函数 .Through artificial water control in the shed of rain free,this paper studied the physiological water requirement patterns of 2～3 years old Platycladus orientalis and Robinia pseudoacacia trees during their growth period,and the relationships between their transpiration water consumption and soil water supply.The results showed that the transpiration water consumption of Robinia pseudoacacia was increased with increasing soil water supply within the range of 40%～100% of field water holding capacity.Its maximum transpiration water consumption was at the early and accelerating growth stages,accounted for 80.5% of total annual water consumption.The transpiration water consumption of Robinia pseudoacacia was 5.13 times as much as that of Platycladus orientalis.Platycladus orientalis had a peak value of transpiration water consumption when the soil moisture content was 40%～100% of field water holding capacity.Its transpiration water consumption was the maximum at accelerating growth stage,accounted for 46.27% of total annual water consumption,next at later growth stage,and relatively small at early growth stage.The correction functions of transpiration water consumption to soil water supply and the time soil moisture functions of practical transpiration water consumption under insufficient water supply for two test species were put forward for the first time.

关 键 词：侧柏 刺槐 生长阶段 蒸腾规律 土壤水分 时间-水分函数 

分 类 号：S715[农业科学—林学]