人工复壮措施对乔木状沙拐枣叶片生长的影响

目的]研究人工复壮措施对乔木状沙拐枣叶片生长的影响。方法]对乔木状沙拐枣林采取平茬、间伐处理,对比分析了同化枝表面积和生物量。结果]不同定植年限下,乔木状沙拐枣同化枝表面积和生物量差异显著(P<0.01),林龄较大的当年同化枝活力较小;经平茬处理的乔木状沙拐枣林,保留株同化枝萌蘖能力明显增强,其中二次平茬最为突出;间伐对乔木状沙拐枣衰老有明显减缓作用,2 m×1 m间伐方式下乔木状沙拐枣同化枝表面积和生物量最大。结论]人工复壮更新措施对于延缓塔里木沙漠公路乔木状沙拐枣林衰败,增强其活力有显著作用。

Effect of Artificial Rejuvenation on Calligonum arborescens Leaf Growth

Objective] The aim was to study effect of artificial rejuvenating on Calligonum arborescens leaf growth.Method] Photosynthetic shoot surface area and its biomass of thinned and cut Calligonum arborescens were comparatively analyzed.Result] Obvious differences of surface area and its biomass among Calligonum arborescens with different ages represented(P<0.01)existed,photosynthetic shoots for the bigger ages trees had higher growth activities;In thinned Calligonum arborescens forest,sprouting capacity for photosynthetic shoots of remaining Calligonum arborescens trees enhanced notably,especially for secondary cutting;Cutting measure remarkably mitigated Calligonum arborescens forest senescence,and cutting by 2 m×1 m had the higher photosynthetic shoot surface area and its biomass.Conclusion] Artificial rejuvenation had anti-aging effect on Calligonum arborescens forest declining,even promote their growth activities.