紫花苜蓿对不同利用类型土壤速效氮含量的影响及调控因素解析  

Effects of Alfalfa on Soil Available Nitrogen Content in Different Land Uses and Analysis of the Driven Factors

作　　者：马富明 张香运 王云英 杜岩功[3] MA Fu-ming;ZHANG Xiang-yun;WANG Yun-ying;DU Yan-gong(Ecological and Environmental Monitoring Center of Xining City of Qinghai Province,Xining810008,China;Beijing Zhongnongande Sports Lawn Technology Co.,Ltd.,Beijing100049,China;Northwest Institute of Plateau Biology,Chinese Academy of Sciences,Xining810001,China)

机构地区：[1]青海省西宁市生态环境监测站,青海西宁810008 [2]北京中农安得运动草坪科技有限公司,北京100049 [3]中国科学院西北高原生物研究所,青海西宁810001

出　　处：《畜牧与饲料科学》2023年第1期91-96,共6页Animal Husbandry and Feed Science

基　　金：青海省重点研发与计划转化项目“青海省高原紫花苜蓿品种适应性评价及示范”(2022-NK-135);青海省昆仑英才“领军人才”项目“高寒草甸氧化亚氮减排策略项目”(青人才2021第13号);中国科学院西部之光交叉团队项目“青藏高原啮齿动物对草地生物多样性和生态系统功能的影响”(E129351214)。

摘　　要：[目的]研究种植紫花苜蓿对不同利用类型土壤速效氮含量的影响和调控因素。[方法]基于中国知网(CNKI)数据库,收集28篇已发表论文,共计31组紫花苜蓿土壤速效氮含量数据。以清耕为对照,采用Meta分析方法,解析种植紫花苜蓿对牧草地、林地、农田、荒漠、果园共5种利用类型土壤速效氮含量的影响。利用混合效应模型,分析气象因子和土壤理化性质对土壤速效氮平均效应值影响的调控因素。[结果]种植紫花苜蓿极显著(P<0.001)增加土壤速效氮含量,平均效应值和增加幅度分别为0.27±0.07和30.99%。种植紫花苜蓿对不同利用类型土壤速效氮含量的增加幅度从高到低依次为牧草地(P<0.001)、林地(P<0.001)、农田、荒漠(P<0.001)和果园,分别为60.01%、58.41%、32.31%、27.12%、22.14%。牧草地和林地平均效应值显著(P<0.05)高于农田、荒漠和果园。基于混合效应模型分析发现,土壤湿度和速效钾含量对平均效应值具有显著(P<0.05)影响,分别可以解释47.81%和17.46%的效应值变异。[结论]种植紫花苜蓿对不同土地利用类型土壤速效氮含量的影响存在较强异质性,通过提高土壤湿度和速效钾含量可以有效增加紫花苜蓿固氮能力。[Objective]This study aimed to reveal the effects of alfalfa cultivating on soil available nitrogen content in different land uses and to assess the driven factors.[Method]A total of 28 published papers indexed in the database of China National Knowledge Infrastructure(CNKI)were collected,and these papers included 31 groups of soil available nitrogen content data of alfalfa cultivating lands.With clear tillage as the control,the effects of alfalfa cultivating on the soil available nitrogen content of such land uses as pasture land,forest land,farmland,desert land and orchard land were assessed by using Meta-analysis.Furthermore,the mixed effect model was used to clarify the driven factors that contributed to the impacts of the meteorological factors as well as the soil physical and chemical properties on the mean effect size of soil available nitrogen content.[Result]Alfalfa cultivating extremely significantly(P<0.001)increased the soil available nitrogen content,and the mean effect size and increase range were 0.27±0.07 and 30.99%,respectively.The increase range of soil available nitrogen content for different land uses attributed to alfalfa cultivating from high to low was pasture land(P<0.001),forest land(P<0.001),farmland,desert land(P<0.001)and orchard land,which were60.01%,58.41%,32.31%,27.12%and 22.14%,respectively.The mean effect size of pasture land and forest land was significantly(P<0.05)higher than that of farmland,desert land and orchard land.The mixed effect model-based analysis demonstrated that the soil moisture and available potassium content had significant(P<0.05)effects on the mean effect size,which could explain 47.81%and 17.46%of the effect size variation,respectively.[Conclusion]The effects of alfalfa cultivating on soil available nitrogen content in different land uses exhibit a strong heterogeneity.Increasing soil moisture and available potassium content will help to enhance the nitrogen fixation capacity of alfalfa.

关 键 词：紫花苜蓿 土壤速效氮 平均效应值 结构方程模型 

分 类 号：S541.1[农业科学—作物学] S153.6