摘要
This study aims to analyze spatial landuse and farming system of reclamated tidal lowland in South Sumatra, Indonesia by using remote sensing technology and GIS in knowing the distribution of landuse change of tidal lowland. From these conditions, it can see cropping patterns on each of the secondary block and its relation to the condition of the water system network. The study was carried out in Delta Saleh areas. The used methodology was field survey and remote sensing technique. It was combined with GIS technology for spatial analysis. Over the last 11 years （1992-2002）, a decline in the paddy field area is from 23,619.4 ha to 18,518.40 ha （27.65%）. A decrease of river acreage （water body） occurred from 6,643.53 ha to 6,559.83 ha. In 1992 it has not detected any coconut plantation, while in 2001 it showed an area of coconut plantation 3,422.84 ha and 3,822.84 ha in 20l l. Significant changes are also presented in primary mangrove forest, widespread declining around 1,940.88 ha （147.20%）. Most of the mangrove forest was converted into secondary mangrove forest and scrub. Linkage with topography type showed that the land with topography Type A was majority for paddy fields 250.28-262.80 ha （62.72%-65.59%）. Mixed crop fields were in second place with acreage of 90.66-107.36 ha （22.72%-26.80%）. The land with topography Type B showed the widest paddy fields （283.14-314.20 ha or 70.70%-78.48%）, followed by upland crops. The land with topography Type C showed that paddy fields were 283.03-300.41 ha （70.66%-75.02 %）, followed by upland crops 94.85-102.78 ha （23.69%-25.66%）, and coconut was the smallest 0.09-0.27 ha. Generally, the cropping index was 100 on PS-I （planting season 1） for BL-I （business land 1） and BL-2 planted with paddy fields, while the PS-2 are generally not cultivated land （fallow）.
