不同刈割高度王草中叶绿素和叶绿醇含量在青贮前后的变动

吕仁龙; 胡海超; 张兴波; 李茂; 王定发; 周汉林

doi:10.3969/j.issn.1006-267x.2019.09.034

动物营养学报 >

2019 , Vol. 31 >Issue 9: 4208 - 4217

DOI: https://doi.org/10.3969/j.issn.1006-267x.2019.09.034

饲料科学与技术 Feed science and technology

不同刈割高度王草中叶绿素和叶绿醇含量在青贮前后的变动

吕仁龙 ,
胡海超 ,
张兴波 ,
李茂 ,
王定发 ,
周汉林

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1. 中国热带农业科学院热带作物品种资源研究所, 儋州 571737;
2. 海南大学热带农林学院, 儋州 571700

吕仁龙(1988-),男,吉林长春人,助理研究员,博士,主要从事反刍动物营养与生理代谢研究。E-mail:lvrenlong@aliyun.com

收稿日期: 2019-03-13

网络出版日期: 2019-09-17

基金资助

国家重点研发计划项目"山羊规模化高效安全养殖关键技术集成与示范"（2018YFD0501903）；2019年中央级公益性科研院所基本科研业务费专项（1630032019027）；海南省重大科技计划项目（ZDKJ2016017-03）

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Changes of Chlorophyll and Phytol Contents in Different Harvesting Height King Grass before and after Ensiling

LYU Renlong ,
HU Haichao ,
ZHANG Xingbo ,
LI Mao ,
WANG Dingfa ,
ZHOU Hanlin

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1. Tropical Crops Genetic Resources Institute, Chinese Academy of Tropical Agricultural Sciences, Danzhou 571737, China;
2. Institute of Tropical Agriculture and Forestry Sciences, Hainan University, Danzhou 571700, China

Received date: 2019-03-13

Online published: 2019-09-17

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摘要

本试验旨在探究不同刈割高度王草[Pennisetum purpureum Schumacher×Pennisetum glaucum（Linnaeus）R.Brown]中叶绿素和叶绿醇含量在青贮前后的变动以及王草青贮中叶绿素和叶绿醇含量与发酵品质之间的关系。试验选定4个试验区，每个试验区有4个小分区，分别在草高50~80 cm（T1）、80~120 cm（T2）、120~180 cm（T3）和180~220 cm（T4）时对4个小分区中的1个进行刈割。将刈割的王草自然干燥至水分含量约为80%后，剪切至2 cm左右，制备青贮，发酵60 d。青贮开封后，测定pH以及有机酸、常规营养成分、叶绿素和叶绿醇含量，并解析其青贮前后变动情况。结果显示：无论是在青贮前还是在青贮后，王草中叶绿素和叶绿醇含量均随着刈割高度的增加而显著降低（P<0.05）。在青贮后，王草中约有74%的叶绿素被分解，但叶绿醇的含量变化不大。尽管在不同刈割高度下王草青贮中有机酸含量表现出了显著差异（P<0.05），但并没有发现王草青贮中叶绿素、叶绿醇含量与发酵指标（pH以及乳酸、乙酸、丙酸、丁酸含量）存在相关性。综上可知，王草中叶绿醇在青贮过程中可被良好保存，并且王草青贮中叶绿醇含量与发酵品质之间不存在相关性。

关键词： 王草; 刈割高度; 青贮; 叶绿素; 叶绿醇

本文引用格式

吕仁龙 , 胡海超 , 张兴波 , 李茂 , 王定发 , 周汉林 . 不同刈割高度王草中叶绿素和叶绿醇含量在青贮前后的变动[J]. 动物营养学报, 2019 , 31(9) : 4208 -4217 . DOI: 10.3969/j.issn.1006-267x.2019.09.034

Abstract

The aims of this study were to explore the changes of chlorophyll and phytol contents in king grass[Pennisetum purpureum Schumacher×Pennisetum glaucum (Linnaeus) R. Brown] before and after ensiling which was harvested at different heights, and to investigate the relation between the chlorophyll and phytol contents and fermentation quality in king grass silage. For the study, four experimental fields were prepared and each experimental field consisted of four plots. The king grass from one of the four plots was harvested at the height of 50 to 80 cm (T1), 80 to 120 cm (T2), 120 to 180 cm (T3) and 180 to 220 cm (T4), respectively. Normally, the king grass was naturally dried to be about 80% moisture, then cut to 2 cm and fermented for 60 days for preparing the silage. pH and the contents of organic acids, nutrients, chlorophyll and phytol were tested after unsealing, respectively, in addition, their change conditions before and after ensiling were also analyzed. The results showed that before or after ensiling, chlorophyll and phytol contents decreased significantly with the increase of harvesting height of king grass. After ensiling, about 74% chlorophyll was decomposed in the king grass silage, however, phytol content hardly changed. Although significantly differences exited in organic acid contents in king grass silage at different harvesting heights (P<0.05), the relations between the chlorophyll and phytol contents and fermentation indexes (pH, the contents of lactic acid, lactic acid, propionic acid and butyric acid) were not found in king grass silage. In summary, phytol can be preserved well during ensiling, and there is no relation between phytol content and fermentation quality in king grass silage.

Key words： king grass; harvesting height; silage; chlorophyll; phytol

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