基于水土保持的山区农业结构调整——以罗田县巴河流域为例

Agricultural Structure Regulation on Water and Soil Conservation in Mountain Region----Case Study of Ba River Basin in Luotian County

以大别山区罗田县巴河流域为例,分析了区域自然环境特征,认为这一地区生态系统脆弱,水土流失最严重的区域为流域中段丘陵区,以坡耕地的面蚀为主;依据流域系统结构的内部差异提出分层农业结构调整思路,即上段以保护为主,中段治理为主,下段开发利用为主,结合区域实际提出以延长土地覆盖期限为目的的旱地作物经营模式,基于水土保持型农业的特征与概念,论证了农业结构调整的效益,即随着中段旱地作物经营模式的改变,特别是随着土地覆盖期的延长,水土流失量将大大降低,农业结构调整对控制区域水土流失意义重大。

Based on the studies of the natural environmental structures of the Ba river basin in Luotian county, the different harnessing zones were divided and the harnessing patterns for optimization of the structures of agriculture and forestry were set up their benefits were demonstrated with emphasis on soil and water conservation. The severe soil erosion is in the central zone of Bahe River basin. The characters and patterns of soil erosion in this zone are related with local activities of agricultural cultivation. Following soil and water conservation the appropriate countermeasures on in this region is studied. To regulate the agricultural structure and prolong land covered periods were thought to be the most useful way to improving the ecosystem. At last the different effect about soil and water conservation were reached, the benefit were compared. On this study the author gave the conclusion: adjust agricultural structure plays important place in optimizing ecosystem on the hill soil erosion region.