不同水土保持措施对红壤坡耕地土壤物理性质的影响

发布时间：2018-09-10 10:09

【摘要】：【目的】针对红壤坡耕地土壤结构差、水土流失严重等问题,研究不同水土保持措施对土壤容重、孔隙度等土壤物理性质的影响,为实现红壤坡耕地的持续、高效利用提供参考。【方法】以等高花生常规耕作为对照(CK),探析表施聚丙烯酰胺(PAM)、香根草篱和PAM+香根草篱等3种水土保持措施对土壤容重、孔隙度、持水量的影响,综合评价不同措施对土壤物理性质的改良效果。【结果】不同水土保持措施处理下0~20 cm土层土壤容重差异显著(P0.05),3种水土保持措施主要对红壤坡耕地0~20 cm土壤容重改善效果明显;不同处理下0~40 cm土层土壤孔隙度和持水量差异不显著(P0.05),不同水土保持措施对0~10 cm土层土壤孔隙度和持水量的提升效果较好。土壤容重与其他土壤物理指标呈负相关,且作为主成分评价不同水土保持措施对土壤物理性质的改良效果的贡献率较高(76.517%)。【结论】土壤容重是评价不同水土保持措施对土壤物理性质改良效果的重要因子,影响着土壤孔隙度和持水量等物理性质;不同水土保持措施对0~10 cm土层土壤物理性质的综合改良效果较好,且以表施PAM+香根草篱效果最佳,是值得推广应用的红壤坡耕地水土保持措施。
[Abstract]:[objective] to study the effects of different soil conservation measures on soil physical properties, such as soil bulk density and porosity, in order to realize the sustainability of red soil sloping cultivated land, aiming at the problems of poor soil structure and serious soil erosion in red soil slope farmland. [methods] the effects of three soil and water conservation measures such as polyacrylamide (PAM), vetiver hedgerow and PAM vetiver hedge on soil bulk density, porosity and water holding capacity were studied by using conventional tillage of equal height peanut as control (CK),. [results] the soil bulk density of 0 ~ 20 cm soil layer under different soil conservation measures was significantly different (P0.05) three kinds of soil and water conservation measures mainly improved the soil bulk density of red soil sloping land for 0 ~ 20 cm. There was no significant difference in soil porosity and water holding capacity between 0 ~ 40 cm soil layers under different treatments (P0.05), but different soil and water conservation measures had a better effect on soil porosity and water holding capacity of 0 ~ 10 cm soil layer. Soil bulk density was negatively correlated with other soil physical indexes. As a principal component, the contribution rate of different soil and water conservation measures to the improvement of soil physical properties was higher (76.517%). [conclusion] soil bulk density is an important factor in evaluating the effect of different soil and water conservation measures on the improvement of soil physical properties. The effects of different soil and water conservation measures on soil physical properties of 0 ~ 10 cm soil layer were improved, and the best effect was obtained by applying PAM vetiver hedgerow on the surface. It is worth popularizing and applying soil and water conservation measures of red soil sloping farmland.
【作者单位】：长江科学院;长江工程监理咨询有限公司(湖北);衡阳师范学院;
【基金】：国家科技支撑计划项目(2012BAH33B00)
【分类号】：S157

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