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Trapping Efficiencies of Cultivated and Natural Riparian Vegetation of Northern Laos

^a International Water Management Inst., IWMI-Laos, P.O. Box 811 Vientiane, Lao PDR (current address: DPI Rutherglen Centre, RMB 1145 Chiltern Valley Road, Rutherglen, VIC 3685, Australia)
^b Institut de Recherche pour le Développement, IRD, P.O. Box 5992, Vientiane, Lao PDR, seconded to IWMI
^c National Agriculture and Forestry Research Inst., P.O. Box 811, Vientiane, Lao PDR
^d Insitut de Recherche pour le Développement, IRD, 32, av H. Varagnat, 93143 Bondy cedex, France, seconded to IWMI

View larger version (158K): [in this window] [in a new window]   Fig. 1. In northern Laos, cultivation of upland (rainfed) rice on steep slopes may be extended to the riparian land of headwater streams.

View larger version (11K): [in this window] [in a new window]   Fig. 2. Riparian site water trapping efficiency (WTE) mean and 95% confidence interval for 2005 and 2006, Houay Pano catchment, Lao PDR. Note the different scale of y axes in the two seasons. Site values are reported in Appendix 2.

View larger version (11K): [in this window] [in a new window]   Fig. 3. Sediment concentration trapping efficiency (SCTE) site mean and 95% confidence interval in 2005 and 2006, Houay Pano catchment, Lao PDR. Note the different scale of y axes; SCTE y-axis is discontinued below –10 to allow comparison among sites. Site values are reported in Appendix 3.

View larger version (154K): [in this window] [in a new window]   Fig. 4. The presence of seepage could be observed during the clearing of riparian land. This riparian site was later cultivated with vegetables.