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在塔里木沙漠公路防护林示范段对老化衰败的乔木状沙拐枣林进行间伐试验,并对间伐后沙拐枣的生长与土壤水盐分布进行连续监测.结果表明:间伐对乔木状沙拐枣的物候期不会产生影响;间伐后保留株的当年株高、冠幅、地径和新枝长等的生长量均大于对照,其增幅的大小依次为株行距2m×1m>株行距1m×1m>对照,且差异显著;间伐当年株行距2m×1m和1m×1m同化枝的表面积分别为每株5.97和5.22m2,均显著高于对照的每株3.1m2;株行距2m×1m、1m×1m与对照在0～160cm土层含水量的差异达到极显著水平,且随间伐强度的增大土层含水量明显增加;土壤含盐量的大小依次为对照>株行距1m×1m>株行距2m×1m,差异显著;间伐后保留株的密度以株行距2m×1m的效果为佳.
In the demonstration section of Talimu Desert Highway Shelterbelt, the decaying experiment was conducted on the decayed arborvitae Juglans mandshurica Linn., And the growth and the soil water and salinity distribution were monitored continuously. The results showed that: The growth of plant height, crown width, diameter and new branch length in the retained strains after thinning were all larger than those in the control, and the increasing amplitude was 2m × 1m> 1m × 1m> Control, and the difference was significant. The surface area of 2m × 1m and 1m × 1m assimilation branches in the thinning year were 5.97 and 5.22m2 per plant respectively, which were significantly higher than the control 3.1m2 each plant; spacing of 2m × 1m, 1m × 1m Compared with the control, the difference of water content in 0 ~ 160cm soil layer reaches extremely significant level, and the water content of soil layer increases obviously with the increase of thinning strength. The salinity of soil is in order of control> spacing 1m × 1m> spacing 2m × 1m, the difference was significant; the density of the reserved strains after thinning was better than that of 2m × 1m.