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Different shrub species partition rainfall into TF, SF, and interception differently, resulting in different amounts of available rainwater. The TF percentage of S. gordejevii (75.3%) was the highest, followed by H. fruticosum (71.2%) and C. microphylla (64.2%); while the SF percentage of C. microphylla (11.0%) was higher than that of H. fruticosum (6.3%) and S. gordejevii (5.3%); and the interception percentage of C. microphylla (24.8%) was higher than that of H. fruticosum (22.5%) and S. gordejevii (19.4%). These results indicate that C. microphylla exhibits a higher interception and a higher SF than H. fruticosum or S. gordejevii. Large variations in rainfall partitioning patterns can be found between species in different areas, with SF percentages ranging from 2.2 to 43.3% (Table 5). The difference in rainfall partitioning of shrub species may be attributed to the differences in morphological characteristics of the plant species. For example, the multiple-stems, umbrella-shaped canopy, smooth stems, and numerous ovate leaves of C. microphylla enable it to better intercept rainwater and thus generate greater SF production. H. fruticosum, on the other hand, is a shrub with rough stems and thin leaves, thus its canopy reduces interception and its branches are capable of absorbing SF. The slender and loose stems and leptophyllous leaves of S. gordejevii are unfavorable for rainfall interception but enhance net precipitation.

Table 5

Gross rainfall (Pg) partitioning into TF, SF and interception (I) in different shrub species

No.LocationShrub speciesPg (mm)TF (%)SF (%)I (%)References
USA Prosopis glandulosa 230 62.8 5.4 31.8 Martinez-Meza & Whitford (1996)  
Flourensia cernua 230 55.8 10.6 34.6 
USA Larrea tridentata 235 64.7 16.8 18.5 Whitford et al. (1997)  
Spain Rosmarinus officinalis 290 31.5 43.3 25.2 Serrato & Diaz (1998)  
Thymus vulgaris 290 37.2 29.8 33 
Juniperus oxycedrus 232 44.5 18.7 36.5 
Spain Anthyllis cytisoides 300 40 20 40 Domingo et al. (1998)  
Retama sphaerocarpa 300 72 21 
China Tamarix ramosissima 263 – 2.2 – Li et al. (2008)  
Caragana korshinskii 263 – 3.7 – 
Reaumuria soongorica 263 – 7.2 – 
China Salix psammophila 395 – 7.6 – Yang et al. (2008)  
Artemisia sphaerocephala 395 – 2.7 – 
China Caragana korshinskii 427 – 12.3 – Jian et al. (2014)  
Hippophae rhamnoides 427 – 8.4 – 
China Caragana korshinskii 413 74.3 16.7 Zhang et al. (2015)  
Artemisia ordosica 413 74.8 2.9 22.3 
China Caragana microphylla 238 64.2 11 24.8 In this study 
Hedysarum fruticosum 238 71.2 6.3 22.5 
Salix gordejevii 238 75.3 5.3 19.4 
No.LocationShrub speciesPg (mm)TF (%)SF (%)I (%)References
USA Prosopis glandulosa 230 62.8 5.4 31.8 Martinez-Meza & Whitford (1996)  
Flourensia cernua 230 55.8 10.6 34.6 
USA Larrea tridentata 235 64.7 16.8 18.5 Whitford et al. (1997)  
Spain Rosmarinus officinalis 290 31.5 43.3 25.2 Serrato & Diaz (1998)  
Thymus vulgaris 290 37.2 29.8 33 
Juniperus oxycedrus 232 44.5 18.7 36.5 
Spain Anthyllis cytisoides 300 40 20 40 Domingo et al. (1998)  
Retama sphaerocarpa 300 72 21 
China Tamarix ramosissima 263 – 2.2 – Li et al. (2008)  
Caragana korshinskii 263 – 3.7 – 
Reaumuria soongorica 263 – 7.2 – 
China Salix psammophila 395 – 7.6 – Yang et al. (2008)  
Artemisia sphaerocephala 395 – 2.7 – 
China Caragana korshinskii 427 – 12.3 – Jian et al. (2014)  
Hippophae rhamnoides 427 – 8.4 – 
China Caragana korshinskii 413 74.3 16.7 Zhang et al. (2015)  
Artemisia ordosica 413 74.8 2.9 22.3 
China Caragana microphylla 238 64.2 11 24.8 In this study 
Hedysarum fruticosum 238 71.2 6.3 22.5 
Salix gordejevii 238 75.3 5.3 19.4 

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