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通过盆栽法模拟田间土壤的干湿交替变化过程和强度,研究了寒区旱区间歇性干旱条件对接种根瘤菌(Rhizobia)苜蓿(Medicago sativa L.)草地土壤养分的影响。结果表明:1年龄苜蓿接种根瘤菌能显著提高土壤全N、有机质、速效N、速效K和速效P含量,而对土壤pH和全P含量影响不大,间歇性干旱处理能显著降低土壤全N、有机质、全P、速效N、速效P和速效K含量,且土壤养分下降量总体上为有机质>全P>全N>速效K>速效N>速效P;通过相关和回归分析,土壤全P和有机质含量的下降量与干湿交替间隔周期呈显著直线正相关(P<0.05),土壤速效K和速效P含量的下降量与干湿交替间隔周期呈显著直线负相关(P<0.05);当干湿交替间隔周期相同时,土壤全N、全P、速效N和有机质含量的下降量,50%田间持水量的处理大于80%田间持水量的处理,而土壤速效K和速效P含量的下降量,50%田间持水量的处理小于80%田间持水量的处理。
The effects of intermittent arid conditions on the soil nutrients of inoculated Rhizobia alfalfa (Medicago sativa L.) grassland were studied by potted soil simulation of alternation process and intensity of dry and wet fields. The results showed that inoculation with Rhizobia could significantly increase soil total N, organic matter, available N, available K and available P, but had little effect on soil pH and total P content. Intermittent drought treatment significantly reduced total N , Organic matter, total P, available N, available P and available K, and the total amount of soil nutrient decreased as organic matter> total P> total N> available K> available N> available P; Through correlation and regression analysis, (P <0.05). The decrease of soil available K and available P content had a significant linear negative correlation (P <0.05) with the alternation interval of wetting and drying. When the periods of alternate wetting and drying were the same, the soil N, P, available N and organic matter content decreased, 50% field water content was treated more than 80% of the field water content, while the soil available K and available P Decrease, 50% field water treatment is less than 80% field water treatment.