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为明确核桃园生草、覆盖效果,研究了核桃园行间种植苜蓿及苜蓿刈割后覆盖行内对土壤含水量、有机质、全N、全P、速效N、速效P等土壤理化性质的影响。结果表明:经过1年试验处理后,各处理0~20cm土层土壤全磷、速效氮、20~40cm土层的速效磷含量均存在极显著差异,0~20cm和20~40cm土层土壤全氮、0~20cm土层土壤速效磷含量均存在显著差异。经过连续2年试验处理后,0~20cm土壤有机质,3个土层土壤全磷、速效磷、速效氮和0~20cm、20~40cm土层土壤全氮含量均存在极显著差异。与对照相比,经过连续2年苜蓿覆盖后,苜蓿覆盖区不同土层的土壤含水量提高了2.22~4.08个百分比点,苜蓿覆盖区0~20cm土层土壤有机质含量为14.67g/kg,提高了77.8%,土壤全磷含量为0.53g/kg,提高了55.9%;苜蓿种植区20~40cm土层土壤速效磷含量为17.17mg/kg,提高了22.4%。表明核桃园种植苜蓿和用苜蓿覆盖能有效地提高土壤含水量和养分含量,增强土壤养分供给能力。
In order to understand the vegetation and coverage of walnut orchard, the effects of alfalfa and alfalfa mowing on soil physico-chemical properties of soil after soil mowing were studied. The results showed that there was a significant difference in total available phosphorus, available nitrogen and available phosphorus in 0 ~ 20cm soil layer after 0-year treatment. Soil available 0 ~ 20cm and 20 ~ 40cm soil layer There were significant differences in soil available phosphorus in 0-20 cm soil layer between nitrogen and nitrogen. After two consecutive years of experiment, soil total organic nitrogen, soil total phosphorus, available phosphorus and available nitrogen in 0 ~ 20cm soil layer and soil total nitrogen content in 0 ~ 20cm, 20 ~ 40cm soil layer were significantly different. Compared with the control, after 2 years of alfalfa coverage, soil moisture in different layers of alfalfa coverage increased by 2.22 ~ 4.08 percentage points, alfalfa cover 0-20 cm soil layer of soil organic matter content of 14.67g / kg, increased Up to 77.8%, total phosphorus content in soil was 0.53g / kg, increased by 55.9%. Soil available phosphorus in 20 ~ 40cm soil layer in alfalfa planting area was 17.17mg / kg, increased by 22.4%. The results showed that planting alfalfa and alfalfa in walnut orchard could effectively increase soil water content and nutrient content and enhance soil nutrient supply.