By Holger L. Fröhlich, Pepijn Schreinemachers, Karl Stahr, Gerhard Clemens
This booklet surveys drivers, outcomes and demanding situations of land use switch in mountainous parts of Southeast Asia, indicates how innovation approaches can deal with them and the way wisdom production might help sustainably boost mountain lands and people’s livelihoods.
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Extra info for Sustainable Land Use and Rural Development in Southeast Asia: Innovations and Policies for Mountainous Areas (Springer Environmental Science and Engineering)
This hypothesis is based on the fact that 90 % of gamma-rays emanate from the top 30–45 cm of the earth’s surface (Gregory and Horwood 1961), which is dominated – including in the steep terrain found in areas of northern Thailand – by soil and not by parent rock. Consequently, if the parent rock is sufficiently transformed – especially in the geochemical sense – the soil signal should differ from the parent rock signal and might even be stronger. In order to test this hypothesis, in the studies here, ground-based gamma-ray measurements were correlated with on-site soil information, as well as with aerial gamma-ray spectra.
Our research has also tested various agronomic methods aimed at the sustainable cultivation of crops on sloping lands. The findings of this research suggest that given the current short fallow cycles used in mountainous areas, the burning of fallow vegetation should be avoided as it leads to high rates of soil erosion, while the amount of plant nutrients supplied via the ashes is low and as a consequence yields decline rapidly at each cropping cycle (Dung et al. 2008). Studying the rate of erosion on moderately sloping maize fields in north-eastern Thailand, Pansak et al.
Stuttgart Neef A, Heidhues F, Stahr K, Sruamsiri P (2006) Participatory and integrated research in mountainous regions of Thailand and Vietnam: approaches and lessons learned. J Mt Sci 3 (4):305–324 Nikolic N, Schultze-Kraft R, Nikolic M, Boecker R, Holz I (2008) Land degradation on barren hills: a case study in northeast Vietnam. Environ Manage 42(1):19–36 Pandey S, van Minh D (1998) A socio-economic analysis of rice production systems in the uplands of northern Vietnam. 1016/ S0167-8809(98)00152-2 Pansak W, Hilger TH, Dercon G, Kongkaew T, Cadisch G (2008) Changes in the relationship between soil erosion and N loss pathways after establishing soil conservation systems in uplands of Northeast Thailand.