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香根草(Vetiveria zizanioides L.)篱和稻草覆盖是重要的水土保持措施。为揭示香根草篱和稻草覆盖对红壤缓坡旱地土壤肥力的影响,本研究于2011年设置了CK、香根草篱、稻草覆盖、香根草篱+稻草覆盖4个处理,并分析了2011年和2012年的花生产量、土壤有机质和氮磷钾养分变化,结果表明:各处理花生产量呈现出覆盖>草篱+覆盖>草篱、对照。与CK处理相比,覆盖和草篱+覆盖处理在2011年分别增产31.74%、15.23%,2012年增产59.39%、41.65%。香根草篱和稻草覆盖可以显著提高红壤坡耕地的有机质、碱解氮、有效磷和速效钾含量,但土壤全氮、全磷和全钾含量不存在显著增加。与2011年相比,虽然2012年草篱和覆盖措施的土壤碱解氮、有效磷和速效钾含量的增幅呈下降趋势,但在所有处理中均表现出草篱+覆盖处理的速效养分最高,这说明,虽然红壤坡耕地花生种植后土壤碱解氮、有效磷和速效钾含量明显下降,但草篱+覆盖可以在增加养分投入的同时有效维持和保蓄土壤速效养分。
Vetiver grass (Vetiveria zizanioides L.) Fence and straw cover are important soil and water conservation measures. In order to reveal the effects of vetiver hedgerows and straw mulching on the soil fertility of red soil gentle slope dry land, four treatments of CK, vetiver hedgerow, straw cover, vetiver hedgerow + straw cover were set up in 2011 and 2011 Annual and 2012 peanut yield, soil organic matter and N, P and K nutrient changes, the results showed that: the treatment of peanut yield cover> hedgerows> cover> hedgerows, the control. Compared with the CK treatment, coverage and grass hedge + cover treatment increased by 31.74% and 15.23% respectively in 2011 and 59.39% and 41.65% respectively in 2012. Vetiver hedgerows and straw mulch could significantly increase the content of organic matter, available nitrogen, available phosphorus and available potassium in sloping farmland, but there was no significant increase in soil total nitrogen, total phosphorus and total potassium. Compared with 2011, although the increase of soil available nitrogen, available phosphorus and available potassium in the hedgerows and mulching measures showed a downward trend in 2012, the hedgerows and coverings showed the highest available nutrients in all the treatments, This shows that although soil available nitrogen, available phosphorus and available potassium decreased significantly after planting peanut in red soil slope, grass hedgerows + mulching could effectively maintain and preserve soil available nutrients while increasing nutrient input.