The Spatial and Temporal Variability of SOC in Hainan Island Over the Past 20 Years
The objective of this study was to investigate the variation of the surface soil organic carbon which as the research object in Hainan.On the base of the historical data and investigations,we collected samples and measured SOC to investigate the temporal and Sspatial variability of SOC in Hainan in 1980s-2000s and explored the main factors by using ArcGIS Spatial Analysis Module.The results showed that SOC in 1980s and 2000s ranged from 2.90 to 93.74 g/kg and 0.25 to 44.67 g/kg respectively which was a downward trend and the average decrease was 5.86 g/kg.According to the SOC grade standard,the SOC in 1980s distributed mostly in the third and four grade,while in 2000s the SOC was concentrated in the grade 4 and 5.It showed that the distribution area of low levels of SOC was increasing gradually,and the area of high levels was reducing.With the special climatic conditions in Hainan,rainfall and temperature significantly affect SOC content;spatial variability of SOC was mainly affected by precipitation and initial SOC content and the impact of land use patterns;coupled with frequent human activities increased the decline in SOC content.For the sustainable development of agricultural production in Hainan we must make some measures to stop SOC decreasing by increasing strongly straw return,organic fertilizer and taking conservation of land-use management.
Soil organic carbonSpatial and temporal variabilityImpact factor
国家科技期刊平台
NSTL
万方数据
维普
