和田河流域胡杨林更新复壮技术

目的]研究和田河流域胡杨林更新复壮技术,为荒漠河岸胡杨林的恢复提供技术支撑.方法]设置2 m×2 m样方调查引洪后河漫滩胡杨、柽柳的恢复情况;设置4 m×50 m样方对胡杨开沟断根萌芽和引洪后胡杨萌芽更新状况进行调查.结果]淤泥+砂土的立地条件有利于洪水过后胡杨幼苗的存活;断根后幼苗更新数量是对照的23~40倍;在断根的阳面幼苗更新的数量是阴面的两倍以上.结论]开挖断根时,距母树的距离不宜超过5m,深度以50~70 cm为宜;断根对幼苗数量的更新效果优于引洪,开沟断根是恢复胡杨林的有效措施之一;引洪后对幼苗更新有较大的促进作用.

Rejuvenation techniques of P. euphratica forest in Hetian river basin

【Objective】The rejuvenation technique of P. euphratica forest in Hetian river basin was studied in order to offer technological support for the restoration of  P. euphratica forest in the currently dry and deserted river bank.【Method】After diverting the flood water， 2 m×2 m quadrats were set to investigate the recovery of P. euphratica and tamarisk in an alluvial flat； 4 m×50 m quadrats were set to investigate P. euphratica sprout and regeneration by digging trenches to cut the tree’s root. 【Result】After the manually created flood， P. euphratica seedlings survived easily under silts and sand-based conditions. After cutting the tree roots， the number of regenerating seedling was 23 to 40 times higher than those seedlings not diverted from the food water. The number of root-cut regenerating seedling from areas exposed to sunlight was 2 times higher than those seedlings from areas not exposed to sunlight. 【Conclusion】When digging a dike， the distance from the dike to the seed tree should be no more than 5 m and the depth of the dike should be from 0.5 m to 0.7 m deep. Irrigation by delivering flood water was a necessary condition for P. euphratica forest recovery and sprouting root sucker. Cutting roots has better regenerating effects than flood-guiding on seedling quantity， and digging trenches was one of the most effective measures for P. euphratica forest recovery. Flood-guiding was beneficial for promoting P. euphratica seedlings grwoth and seedlings quantity.