| 毛小红,李正鹏,严清彪,韩梅.青海高原地区绿肥毛叶苕子腐解规律及养分释放特征[J].干旱地区农业研究,2022,40(1):193~202 |
| 青海高原地区绿肥毛叶苕子腐解规律及养分释放特征 |
| Decomposition law and nutrient release characteristics of green manure Vicia Villosa L. in Qinghai Plateau |
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| DOI：10.7606/j.issn.1000-7601.2022.01.22 |
| 中文关键词: 毛叶苕子 腐解特征 养分释放 青海高原 |
| 英文关键词:Vicia Villosa L. decomposition characteristic nutrient release Qinghai Plateau |
| 基金项目:国家绿肥产业技术体系项目（CARS-22-Z-17）；青海大学农科院创新基金项目（2019-NKY-6） |
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| 中文摘要: |
| 为了解绿肥毛叶苕子(Vicia Villosa L.)在青海高原地区对土壤的培肥效果以及为农作物提供养分情况，在田间利用尼龙网袋法，研究毛叶苕子腐解特性和氮磷钾等养分释放规律。结果表明：绿肥毛叶苕子在翻压后50 d内腐解速度较快，腐解率达38%，后期腐解速度缓慢，在取样结束后，累积腐解率为86.39%;整个腐解过程中氮磷钾养分释放速率表现为氮＞钾＞磷，氮和钾的养分释放趋势存在一致性，在52 d内快速释放，养分释放率分别为56.54%、74.27%，后期释放速率缓慢，在腐解结束时，其养分累积腐解率达91.31%、99.04%；磷的释放速率缓慢，且波动性较大，在腐解周期内磷素含量呈上升趋势，取样结束后，累积腐解率为75.71%。绿肥毛叶苕子的干物质累积腐解率、养分累积释放率与腐解时间的关系可以通过线性函数和对数函数拟合。预测本试验处理可为后茬作物地块提供氮素172.80 kg·hm-2、磷素10.93 kg·hm-2、钾素139.63 kg·hm-2。 |
| 英文摘要: |
| To determine the effect of green manure Vicia Villosa L. on soil fertility and provide nutrient resources for crops in Qinghai Plateau, the decomposition trends of Vicia Villosa L. and the nutrient release characteristics of nitrogen, phosphorus and potassium were studied with nylon mesh bags in the field. The results showed that the decomposition rate of green manure was 38% within 50 days after being turned over, and the decomposition rate was slow at the later stage. After sampling, the cumulative decomposition rate was 86.39%. In the whole decomposition process, the release rate all ranked as N>P>K, showing the same trend.The release rate of N and K was 56.54% and 74.27% in 52 days, respectively, while the release rate was slow in the later stage. At the end of decomposition, the cumulative decomposition rate of nutrients reached 91.31% and 99.04%. The release rate of phosphorus (P) was slow and fluctuating, and the content of phosphorus increased during the decomposition period. After sampling, the cumulative decomposition rate was 75.71%. The relationship between dry matter cumulative decomposition rate, nutrient cumulative release rate and decomposition time was fitted by linear function and logarithmic function. This experiment predicts that 172.80 kg·hm-2 of nitrogen, 10.93 kg·hm-2 of phosphorus and 139.63 kg·hm-2 of potassium would be left in the field for the following crops. |
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