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作 者 ：杨文斌,包雪峰,杨茂仁,杨明

期 刊 ：生态学报 1991年 11卷 4期 页码：318~323

关键词：梭梭；抗旱；生理生态；沙土含水率；蒸腾速率；

Keywords:transpiration rate（Tr）, osmotic potential （π）, water content of the soil（ω,

摘 要 ：本文测试了风沙土上着生梭梭的SPAC系统的水分关系和P-V曲线的水分特征,分析结果表明:沙土含水串(w)大于2.0％,梭梭生长正常,蒸腾速串(T_r)主要受光照强度(L_i)的影响,关系为T_r=α+bL_i而W小于2.0％,同化枝水势(ψ_p)成为影响T_r的主要因子之一,此时有,T_r=α+bL_i+Cψ_i;w与同化枝清晨水势(ψ_m)的关系力,ψ_m=-4.6396×0.773649_i~w转点W=2.0％,ψ_m=-2.9MPa大于ψ_z~o=-3/4MPa说明梭梭仍能恢复膨压,W与ψ_s的关系为:ψ_z=10.91945×0.25559w,转点又是W=2.0％;W小于2.0％,ψ_s迅速下降,W=2.0％为‘临界闸’,到W=1.0％时,ψ_m=-3.6MPa小于,ψ_x~o,说明梭梭已不能恢复膨压高的束缚水.低的ζ_(m x)和ψ_x~o是梭梭耐旱的主要生理特征,进而形成一套抗旱的生理生态水分关系。

Abstract:The paper have investigated the physio-ecological water relationship of the SPAC system and water parameters of P-V curve on Saxaul growing in aeolian sandy soil. The results are as follows. When the water Content (to) of the aeolian sandy soil is above 2%, the plant grows very well, the trans-peration rate (Tr) is mainly controlled by the light intensity (Li), and the relationship between Tr and Li is Tr = a+b×Li(a and b are coefficients). When the water content is below 2%,the water potential ((?)p) of ph...

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