不同留茬高度对荒漠植物霸王营养生长的影响

 为有计划地保护西鄂尔多斯国家级自然保护区天然荒漠植物霸王,维持其生态位,以该区生长衰退霸王为研究对象,探讨了不同留茬高度(-3(地下)、0(齐地面)、3、5、10、15cm)的平茬处理对霸王营养生长的影响。结果表明:① 不同留茬高度下,霸王不同灌丛平茬效果以当年生枝条数量、长度、直径等指标为依据均优于同一灌丛处理;② 不同留茬高度下,霸王株高增长量均比对照高,最高为留茬高度-3cm时,为对照的3.64倍;当年生枝条的萌发数量均比对照多,不同灌丛留茬高度为3cm时最多,为对照的23.08倍,为同一灌丛的5.45倍;留茬高度为-3cm时,当年生枝条直径最大,为对照的1.58倍,为同一灌丛的1.25倍;留茬高度为3cm时当年生枝条长度最长,为对照的2.63倍,为同一灌丛的1.98倍;③ 隶属函数分析发现,不同灌丛,霸王营养生长由强到弱的顺序为:3cm>0cm>-3cm>10cm>15cm>5cm;同一灌丛,霸王营养生长由强到弱的顺序为:10cm>-3cm>5cm>0cm>15cm>3cm。

Effects of Stubble Height on Zygophyllum xanthoxylum (Bunge) Vegetative Growth

In oder to protect the natural desert plant Zygophyllum xanthoxylum (Bunge) in the western Ordos national nature reserve according to a plan, and to maintain its ecological niche, by taking Z. xanthoxylum growth recession as the research object, six different stubble heights (-3(under ground), 0(on ground), 3(over ground), 5(over ground), 10(over ground), 15cm(over ground)) were selected, to investigate the effects on its vegetative growth. It is shown that, ① For different stubble heights, the overall effect with respect to the number of branches, the length and the diameter of Z. xanthoxylum of the different brush is better than that of the same brush;② For different stubble heights, its height grows higher than the control, the highest is that with the stubble height of 3cm, 3.64 times as the control;the number of new branches is larger than that of the contrast, with a difference of up to 23.08 times at the stubble height of 3cm for the different brush, and 5.45 times for the same brush;The diameter of new branches is larger than that of the contrast, with a difference of up to 1.58 times at the stubble height of 3cm for the different brush, and 1.25 times for the same brush;The length of new branches is larger than that of the contrast, with a difference of up to 2.63 times at the stubble height of 3cm for the different brush, and 1.98 times for the same brush;③ The membership function analysis shows that for the different brushes, the vegetative growth of Z. xanthoxylum is in the following order according to the stubble height: 3cm>0cm>-3cm>10cm>15cm>5cm;For the same brush, the order is 10cm>-3cm>5cm>0cm>15cm>3cm.