木薯柱花草间种体系固氮机制和生产效益分析
Nitrogen Fixation Mechanism and Production Benefit Analysis of Cassava and Stylosanthes Guianensis Intercropping System
郑永清 1马旭东 1李伯松 1薛茂富 1陈松笔2
作者信息
- 1. 中国热带农业科学院 广州实验站,广东 广州 510140
- 2. 中国热带农业科学院 热带作物品种资源研究所,海南 儋州 571737
- 折叠
摘要
柱花草是重要的间种植物,但其与木薯间种体系中的固氮机制尚不清楚.本研究采用柱花草与木薯间种体系,分析柱花草生长期的农艺性状和不同组织氮含量的动态变化规律,结果表明:柱花草氮同位素值平均1.87‰,茎平均1.03‰,叶平均2.41‰,不同组织氮同位素呈现不同的变化趋势.前期柱花草氮素来源于土壤无机氮,中期无机氮和固氮都有贡献,后期柱花草急速生长阶段,固氮菌数量虽然增加,但其贡献逐渐减低,柱花草氮素主要来源转向土壤无机氮.此外,木薯间种柱花草较木薯单种增产鲜薯21.21%;间种与木薯单种、柱花草单种相比分别增加收入1361.09元/亩、1159.21元/亩,柱花草与木薯间种体系可有效提高氮源利用率和经济效益.
Abstract
Stylosanthes guianensis is an important intercropping plant,but the mechanism of nitrogen fixation between Stylosanthes guianensis and Cassava intercropping system is not clear.In this study,the intercropping system of Stylosanthes guianensis and Cassava was used to analyze the agronomic characters of Stylosanthes guianensis during its growth period and the dynamic change of nitrogen content in different tissues.The results showed that:the average nitrogen isotope value of Stylosanthes guianensis was 1.87%for roots,1.03%for stems,and 2.41%for leaves,respectively.The average nitrogen isotope value varied from different tissues.In the early stage,the nitrogen of Stylosanthes guianensis came from soil inorganic nitrogen;in the middle stage,both inorganic nitrogen and nitrogen fixation contributed;in the late stage,the number of nitrogen-fixing bacteria increased in the rapid growth stage of Stylosanthes guianensis,but its contribution gradually decreased;the main nitrogen source of Stylosanthes guianensis turned to soil inorganic nitrogen.In addition,Stylosanthes guianensis interplanting Cassava increased yield of fresh tubes 21.21%compared with single Cassava.Compared with monoculture Cassava and monoculture Stylosanthes guianensis,intercropping increased the income by 1361.09 yuan/mu and 1159.21 yuan/mu,respectively.To sum up,the intercropping system of Stylosanthes guianensis and Cassava can effectively provide nitrogen source utilization rate and economic benefits.
关键词
木薯/柱花草/间种技术/氮源/生产效益Key words
Cassava/Stylosanthes guianensis/intercropping techniques/Nitrogen source/economic benefit引用本文复制引用
基金项目
国家木薯产业技术体系建设项目(CARS-12-gdqxd)
中央级公益性科研院所基本科研业务费专项(1630112023007)
出版年
2024
NETL
NSTL
万方数据