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首页> 外文学位 >Stemflow, throughfall, and root water channelization by three arid land shrubs in southern New Mexico.
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Stemflow, throughfall, and root water channelization by three arid land shrubs in southern New Mexico.

机译：新墨西哥州南部的三种干旱土地灌木产生的茎流，穿透水和根水通道化。

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Three experiments were conducted to examine how precipitation-vegetation relationships for the shrubs Larrea tridentata, Prosopis glandulosa, and Flourensia cernua affect the interception, redistribution, and storage of water in desert ecosystem. The first experiment was designed to determine the percentage of rainfall partitioned as stemflow and throughfall, and also to evaluate the effect of some plant canopy parameters on stemflow and throughfall. The second examined the effect of stem-angles on stemflow. The third assessed the effect of varying canopy areas and volumes as well as root allocation on redistribution of stemflow into the soil profile. Differences in stemflow as percentage of precipitation were found among species. The stepwise regression analysis suggested that the best one-variable model for L. tridentata was canopy volume, which accounted for 87% of the variation in collected stemflow. The best one-variable model for P. glandulosa and F. cernua was canopy area, which accounted for 82% of the variation in collected stemflow in each species. Stemflow data from winter and summer months were statistically compared to determine the influence of leaves on stemflow generation in P. glandulosa and F. cernua. Stemflow amounts collected during winter months do not differ significantly from those of summer months. This suggests that in these species the absence of leaves during winter months does not affect the generation of stemflow. Analysis of variance showed that the percentage of throughfall was different among species. This suggested that the variations in canopy characteristics could explain, in part, the interspecific throughfall differences.; Stem-angle and stem-length were shown to have a significant effect on stemflow generation in F. cernua and in L. tridentata. Similarly, there was a significant relationship between stem-angle and stemflow in P. glandulosa. The variability in morphology of L. tridentata in various topographic locations and soil types may be related to the importance of stemflow water to the shrub in any particular site.; Analysis of Rhodamine-B dye distribution under shrubs indicated that root channels are preferential pathways for movement of stemflow water into soil, and that this water is potentially the source of soil moisture which allows shrubs to persist and even prosper under drought conditions.
机译：进行了三个实验，研究了Larlar tridentata，Prosopis glandulosa和Flourensia cernua灌木的降水-植被关系如何影响沙漠生态系统中水的截留，再分配和存储。设计第一个实验以确定降雨的百分比，将其划分为茎流和通水量，并评估一些植物冠层参数对茎流和通水量的影响。第二篇研究了茎角对茎流的影响。第三个评估了不同冠层面积和体积以及根系分配对茎流向土壤剖面的重新分配的影响。在物种之间发现茎流随降水百分比的差异。逐步回归分析表明，最好的三变量L. tridentata模型是冠层体积，其占收集的茎流变化的87％。南美白对虾和南美白对虾最好的单变量模型是冠层面积，占每个物种收集的茎流变化的82％。对冬季和夏季月份的茎流数据进行统计比较，以确定叶片对P. glandulosa和F. cernua茎流产生的影响。冬季收集的干流量与夏季收集的无明显差异。这表明在这些物种中，冬季没有叶子不会影响茎流的产生。方差分析表明，不同物种的穿透百分比不同。这表明冠层特征的变化可以部分解释种间穿透落差。结果表明，茎角和茎长对蜡菊和三齿dent的茎流产生有显着影响。同样，P。glandulosa的茎角与茎流之间也存在显着关系。在不同的地形位置和土壤类型下，三齿线虫的形态变化可能与茎流水对任何特定地点的灌木的重要性有关。灌木下若丹明-B染料分布的分析表明，根通道是茎流水向土壤中迁移的优先途径，并且这种水可能是土壤水分的来源，可使灌木在干旱条件下持续存在甚至繁荣。

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