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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

王进鑫1;黄宝龙2;王明春1;王迪海1   

  1. 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

  • 收稿日期:2004-01-08 修回日期:2004-10-21 出版日期:2005-03-18

WANG Jinxin1,HUANG Baolong2,WANG Mingchun1,WANG Dihai1   

  1. 1Northwest Sci-Tech University of Agriculture and Forestry,Yangling 712100, China;2Nanjing Forestry University,Nanjing 210037,China

  • Received:2004-01-08 Revised:2004-10-21 Online:2005-03-18

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5.13倍.侧柏蒸腾耗水量在土壤相对含水率为40%~100%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46.27 %,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.

Abstract: 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.

Key words: Polypores, Rare species, Threathened species, Changbai Mountain, Ecosystem