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本文测定和研究了栽植于半湿润区（海拉尔）、半干旱区（赤峰和呼和浩特）以及半早向干旱区过渡地段（霍洛）的油松（Ｐｉｎｕｓｔａｂｕｌａｅｆｏｒｍｉｓ，１４－１６年生）、白杆（Ｐｉｃｅａｍｅｙｅｒｉ）和青杨（Ｐｏｐｕｌｕｓｓａｔｈａｙａｎａ，７－９年生）的主要耐旱性生理指标。结果指出各被试树种的水饱和总体渗透势（π０）、初始失膨点总体渗透势（πｐ）和总体弹性模数（Ｅ）在被试地区间存在着显著差异（Ｐ≤０．０５），并且这些生理指标同气候湿度指标（Ｉｍ）具有显著的相关关系（ｐ≤０．０５），可描述为Ｙ＝Ａ＋ＢＩｍ（Ｙ生理指标）。从而表明油松、云杉和青杨是耐旱性可变树种，并通过干旱锻炼可提高其耐旱性。
In this paper, Pinus tabulaeformis (14-16 years old) planted in the semi-humid zone (Hailar), semi-arid zone (Chifeng and Hohhot) and semi-arid arid zone (Holo) were measured and studied. Piceameyeri ) And Populussathayana (7-9 years old). The results showed that there was a significant difference (P≤0.05) in the tested area between the test species and the total water vapor permeability (π0), total infiltration potential (πp) and total elastic modulus (E) , And these physiological indexes have a significant correlation with climatic humidity index (Im) (p≤0.05), which can be described as Y = A + BIm (Y physiological index). Thus, Pinus tabulaeformis, Picea mongolica and Populus davidiana are the variable drought-tolerant species and their drought tolerance can be improved by drought training.