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当前位置: 首页 > 文章 > 不同土壤盐碱梯度下羊草最适氮、磷肥施用量模拟 吉林农业大学学报 2019 (5) 592-599
Position: Home > Articles > 不同土壤盐碱梯度下羊草最适氮、磷肥施用量模拟 Journal of Jilin Agricultural University 2019 (5) 592-599

不同土壤盐碱梯度下羊草最适氮、磷肥施用量模拟

作  者：
刘泓杉;李晴宇;黄宇金;曹晨昊;高禄年;张玉树
关键词：
羊草;氮肥;磷肥;盐碱胁迫;土壤盐碱化;生态化学计量学;报酬递减规律
摘  要：
土壤盐碱化限制农业发展,亟需采取有效的措施以提高该类型土地的生产能力.试验选用吉林省西部地区优势牧草-羊草为研究对象,应用生态化学计量学理论和报酬递减规律,采用养分添加的方式模拟不同盐碱环境下羊草应施入氮(N)、磷(P)肥的最适量.结果表明:土壤pH为8. 4时为羊草最适宜生长的酸碱环境;施N肥可同时增加羊草N和P含量,施P肥可明显提高羊草P含量,但对N含量影响不大,因此施N肥是提高盐碱化草地生产力的重要措施;在低度盐碱条件下(pH为7. 0~7. 7),N、P肥的施用量分别为6. 98~7. 47 kg/667m~2和1. 11~1. 17 kg/667m~2;在中度盐碱条件下(pH为8. 4~9. 1),N、P肥的施用量分别为4. 71~4. 94 kg/667m~2和0. 98~0. 99 kg/667m~2;在高度盐碱条件下(pH≥9. 8),N、P肥的施用量分别为3. 27 kg/667m~2和1. 32 kg/667m~2.
作  者：
LIU Hongshan;LI Qingyu;HUANG Yujin;CAO Chenhao;GAO Lunian;ZHANG Yushu;College of Earth Sciences,Jilin University;Institute of Soil and Fertilizer,Fujian Academy of Agricultural Sciences;
关键词：
L.chinensis;;N fertilizer;;P fertilizer;;saline-alkali stress;;soil salinization and alkalization;;ecological stoichiometry;;law of diminishing returns
摘  要：
Soil salinization and alkalization limit agricultural development and effective measures are urgently needed. In this study,we used Leymus chinensis( L.chinensis) to apply nutrient fertilizers to simulate the optimum nitrogen( N) and phosphorus( P) amount under different pH levels. In this study,L. chinensis,the dominant pasture in western Jilin province,was selected as the research object,and the theory of leaf N ∶ P stoichiometry and law of diminishing returns were applied. The results showed that the most suitable pH environment for L.chinensis occurred at about pH 8. 4. Moreover,it was found N fertilizer promoted the increase of both N and P content. The application of P fertilizer could significantly increase the P content of L. chinensis,but had little effect on N content.Therefore,N fertilizer application is the primary measure to raise grassland productivity. Also,the amount of N and P fertilizer must be controlled. According to the simulation results,N and P fertilizer amount should be controlled at about 6. 98-7. 47 kg/667 m~2 and 1. 11-1. 17 kg/667 m~2 at low pH level( pH 7. 0-7. 7). At middle pH level( pH 8. 4-9. 1),N and P fertilizer amount should be controlled at about 4. 71-4. 94 kg/667 m~2 and 0. 98-0. 99 kg/667 m~2,respectively. N and P fertilizer amount should be controlled at about 3. 27 kg/667 m~2 and 1. 32 kg/667 m~2 at high pH level( pH≥9. 8).

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