红壤丘陵区不同成土母质发育稻田土壤的肥力特性

Soil Fertility Properties of Paddyfield Developed by Different Parent Materials in Red Soil Hilly Region

以红壤丘陵区的典型区域宝洞裕流域作为研究区域,采用对比研究法探讨了不同成土母质发育的稻田土壤肥力状况,并采用模型综合评判法(INDEX模型)评价了稻田土壤的肥力水平.肥力指标研究结果表明,第四纪红土发育稻田土壤的养分质量分数相对其他两种母质较高,其表层土壤有机质质量分数均达到32 g.kg-1以上,全量养分指标和有效养分指标也有同样的规律;肥力综合评价结果表明,第四纪红土发育的清夹泥水稻土综合肥力指数达到0.109 969,而紫色沙页岩冲积物仅为0.028 521.

Baodongyu catchment, a typical region of red soil hilly region, was selected as the research site. The research explored the soil fertility status of paddyfield developed by different parent materials in comparative method, and studied the soil fertility level in universal assessment method （INDEX model）. The result has showed that soil nutrient content developed by quaternary red earth is relatively higher than that by purple sandshale alluvium and red sandstone alluvial soil. The total nutrient index and effective nutrient index have the same feature. The universal assessment value has shown that the fertility index of paddyfield soil developed by purple sandshale alluvium is only 0. 028 521, which is much lower than that of paddyfield soil developed by quaternary red earth, whose index is only 0. 109 969.