Elevation and Land Use Types Have Significant Impacts on Spatial Variability of Soil Organic Matter Content in Hani Terraced Field of Yuanyang County, China

doi:10.1016/S1672-6308(14)60282-1

Abstract

Abstract:

Soil organic matter (SOM) content is one of the most important indicators of the sustainability of soil. To maintain sustainable soil utilization and management in fragile Hani terraced field, it is meaningful to investigate the effects of topography and land use type on SOM content. Descriptive statistics and geostatistics were used to analyze the data and the kriging method was applied to map the spatial patterns of SOM content. The results showed that the mean SOM content was 32.76 g/kg, with a variation coefficient of 40%. The SOM content was affected by elevation and land use type. As the increase of elevation, the SOM content in Hani terraced field also increased obviously. The SOM content in tea garden, which is almost at high elevation, was the highest in all six land use types, and the SOM content decreased in a following sequence: tea garden > paddy field > corn field > banana garden > cassava field > sugarcane field. In addition, at the same elevation, the paddy field had the highest SOM content compared with other land use types. All these results demonstrate that paddy field is the most efficient and suitable land use type for SOM conservation at high, middle or low elevations in the fragile Hani terraced field. In order to protect soil quality and maintain the sustainable agricultural development, it is necessary to maintain or even to enlarge the area of paddy field in Yuanyang county, Yunnan Province, China.

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Key words: Hani terraced field, elevation, land use type, geostatistics, soil organic matter content

Feng-bo Li, Guang-de Lu, Xi-yue Zhou, Hui-xiang Ni, Chun-chun Xu, Chao Yue, Xiu-mei Yang, Jin-fei Feng, Fu-ping Fang. Elevation and Land Use Types Have Significant Impacts on Spatial Variability of Soil Organic Matter Content in Hani Terraced Field of Yuanyang County, China[J]. Rice Science, 2015, 22(1): 27-34.

Figures/Tables 5

Fig. 1. Soil organic matter (SOM) content at different altitudinal ranges.Different lowercase letters indicate significant difference at P < 0.05 level.

Fig. 2. Duncan’s test analysis following of mean values of soil organic matter (SOM) in each land use type.Different lowercase letters indicate significant difference at P < 0.05 level.

Fig. 3. Frequency distributions of soil organic matter (SOM) content in six land use types.

Table 1 Soil organic matter content in land use types at different elevations.

Fig. 4. Spatial distribution of soil organic matter (SOM) content in Yuanyang county, Yunnan Province, China.

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