2. Methodology
2.1. Study area
The field experiment was carried out in Suo Yu He valley, Shangnan County (33°06′–33°44′ N and 110°24′–111°01′ E), which is located in the Qinling mountainous region at the eastern part of southern Shaanxi Province (Fig. 1). The area is representative for the Shangnan County and characterised by hilly topography at low altitudes (350 m to 700 m above sea level). According to the Agricultural Planning Committee of Shangnan County (1984) annual total sunshine is 1900 h, frostless period is 199 to 230 days, annual temperature ranges between 12.7 °C and 15.0 °C, and the dominated soil type in the study area is slight acidic, yellow-brown soil developed from granitic gneiss. The study area is at the edge of the subtropical humid climatic zone with 700 mm to 850 mm annual precipitation, which mainly falls during June to September, mostly as storm with high intensity. According to Zhang et al. (2000) the rainy season in the study area lasts from May to October. The summer precipitation in the mountainous region in southern Shaanxi Province is mainly convective rainfall (Bi et al., 2006).
2. Methodology
2.1. Study area
The field experiment was carried out in Suo Yu He valley, Shangnan County (33°06′–33°44′ N and 110°24′–111°01′ E), which is located in the Qinling mountainous region at the eastern part of southern Shaanxi Province (Fig. 1). The area is representative for the Shangnan County and characterised by hilly topography at low altitudes (350 m to 700 m above sea level). According to the Agricultural Planning Committee of Shangnan County (1984) annual total sunshine is 1900 h, frostless period is 199 to 230 days, annual temperature ranges between 12.7 °C and 15.0 °C, and the dominated soil type in the study area is slight acidic, yellow-brown soil developed from granitic gneiss. The study area is at the edge of the subtropical humid climatic zone with 700 mm to 850 mm annual precipitation, which mainly falls during June to September, mostly as storm with high intensity. According to Zhang et al. (2000) the rainy season in the study area lasts from May to October. The summer precipitation in the mountainous region in southern Shaanxi Province is mainly convective rainfall (Bi et al., 2006).
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