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采用野外调查与室内分析相结合的方法,研究了山地森林-干旱河谷交错带表层土壤侵蚀率及其与土壤物理性质的关系。结果表明:岷江上游干旱河谷区不同植被条件下表层土壤侵蚀较为严重,平均土壤侵蚀率为27.58%。土壤侵蚀率与土壤结构破坏率(SPBR)极显著正相关;与土壤有机质含量、>0.25mm水稳性团聚体含量(WSA)、湿筛后团聚体平均重量直径(MWD)和几何平均直径(GMD)显著负相关。土壤侵蚀率分别与土壤有机质含量、结构破坏率、湿筛后团聚体MWD和GMW、>0.25mm水稳性团聚体含量建立的回归方程预测效果相对较好。
The combination of field investigation and field analysis was used to study the relationship between the soil erosion rate and soil physical properties in the mountainous forest - dry valley ecotone. The results showed that under the different vegetation conditions in the arid valley area in the upper reaches of the Minjiang River, the erosion of surface soil was more serious with the average soil erosion rate of 27.58%. Soil erosion rate and soil structure failure rate (SPBR) were significantly and positively correlated with soil organic matter content,> 0.25mm water stable aggregate content (WSA), wet sieved aggregate average weight diameter (MWD) and geometric mean diameter GMD) was significantly negatively correlated. The soil erosion rate is relatively better than the regression equation established by soil organic matter content, structural failure rate, wet-sieved MWD and GMW, and> 0.25mm water-stable aggregates, respectively.