草坪型结缕草冠层截留性能试验研究

草坪植物冠层对雨水或灌溉水的截留量大小对于草坪水分利用效率具有重要影响.针对草坪型结缕草,用吸水法分别试验研究了单株和群落草坪草的冠层截留特性.结果表明:结缕草的叶片数量、叶面积对单株结缕草截留量影响显著.随着叶片数量的增多,单株结缕草截留量增大,5叶枝条的结缕草截留量高达0.16g,占其植株浸水前自身重的81.22%,而3叶枝条的结缕草截留量仅为5叶枝条结缕草的1/2.单株结缕草截留量与叶面积呈线性正相关关系.对于结缕草草坪,修剪留茬高度越高,截留量就越多.建植3a的草坪在修剪高度14cm时冠层截留可达1.05mm,修剪6cm时截留量为0.48mm.在修剪留茬高度相同的情况下,不同生长年限间草坪草截留量、截留率差异极显著(P＜0.01),建植3a的草坪比建植1a的草坪能拦截更多的水分,在修剪高度6cm时,3a生草坪草截留量为0.48mm,而1年生草坪草截留量为0.38mm,并且随着修剪高度的增加,不同年限间截留量的差异越明显,差值最大可达0.44mm.

Capability of canopy interception of turfgrass (Zoysia sinica Hance)

Rainfall interception by the canopy of turfgrass (Zoysia sinica Hance) has important effect on water use efficiency. In this paper, the capability of canopy interception for the individual and population grass was measured by using wet-absorption method. The result showed that both leaf number and leaf area had remarkably effect on the interception for the individual and population grass. The interception increased with the leaf number, the weight of intercepted rainwater with five leaves was 0.16g, which was almost 81.22% of fresh weight of leaves, while with three leaves that was only half of five leaves. The interception increased with leaf area. For the population of turfgrass, the interception reached to 1.05mm for 14cm mowing height, while the 6cm height was only 0.48 mm. For the same mowing height, the interception varied from different turf established years, three-year turfgrass could intercept much more water than one year, three-year turfgrass was 0.48mm for 6cm height, while one year turfgrass was 0.38mm. The difference between growth years was significant with increased mowing height, the maximum difference can be up to 0.44mm.