不同平茬方式对退化白刺生长的影响

通过对退化白刺进行3种方式机械平茬复壮试验,结果表明:(1)平茬白刺冠幅、萌条数量、萌条枝长和地径较未平茬植株均显著提高,表明平茬能促进白刺生长,有助于提高单位面积白刺的生物量;(2)平茬白刺根系对水分的吸收量高于未平茬的白刺,平茬的白刺表现出旺盛的生命力,地上部分生长迅速;(3)3种平茬方式生长表现存在差异,全面平茬在各项指标上具有优势。若后期注重的是平茬以后的萌发以及高生长,建议采用全面平茬方式;若注重林分防风固沙效能,建议采用平茬一半或者间隔平茬。

Effects of Different Stumping Methods on Growth of Degenerated Nitraria tangutorum

The mechanical stumping and rejuvenation experiments for degenerated Nitraria tangutorum by three modes were conducted.Result shows that:(1)The crown width,new branch numbers,the branch length&ground diameter of Nitraria tangutorum are significantly higher than that of non-stumping,indicating that stumping can promote the growth of Nitraria tangutorum and help to increase the biomass.(2)The absorption of groundwater in the root of Nitraria tangutorum is higher than non-stumping Nitraria tangutorum.Stumping Nitraria tangutorum shows vigorous capacity;the parts above ground grow rapidly.(3)Inconsistent growth performance among the three types of cutting rejuvenation methods,and overall cutting rejuvenation shows advantages in each indices.However,the emphasis is on the germination and high growth after cutting branches.Comprehensive consideration is recommended to adopt a stumping method.If the flattened stubble is a windproof and sand-fixing forest,considering its function and growth after stumping,it is recommended to use half stumping or interval stumping.