结果表明，在年生长期中，刺槐林地水分条件严酷、土壤有效水分少。
The results show that the soil water conduction of the plantation was very poor and the available water content was very low during the growing season.
而延安和固原刺槐林地水分生产力较低且稳定性差，刺槐林稳定生长期不超过40年。
In forestlands of Yan'an and Guyuan, the annual net productivities were low and instable, and stable growth periods did not exceed 40 years.
而延安和固原刺槐林地水分生产力较低且稳定性差，刺槐林稳定生长期不超过40年。
In forestlands of Yan'an and Guyuan, the annual net productivities were low and instable, and stable growth periods did not exceed 40 years.
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