汤涤洛　涂修亮　熊伟　朱伟　汪红武

摘要 以饲用苎麻（Boehmeria nivea L.）“中饲苎1号”为研究对象，研究了饲用苎麻地上部分叶、茎中N、P、K、Ca、Mg元素含量的动态变化、分布情况及各元素之间的相关性。结果表明，饲用苎麻叶、茎中相对应的N、P、K、Ca、Mg元素含量变化趋势各不相同。饲用苎麻叶、茎对N、P、K、Ca、Mg元素吸收的选择性不同，叶片不同元素含量由高到低依次为N、Ca、K、Mg、P;茎部依次为N、K、Ca、Mg、P。叶片对N、Ca、Mg、P有较强吸收和积累，而茎中则贮存了较多的K。叶片中Ca含量与Mg含量间呈极显著正相关;茎部N含量与K、Mg含量间呈极显著正相关，与Ca含量呈显著正相关;叶片N与茎部N含量间呈极显著正相关，与茎部Ca、Mg含量之间呈显著正相关;叶片K与茎部K含量之间呈显著负相关，与茎部Mg含量之间呈极显著负相关。

关键词 饲用苎麻;元素含量;动态变化;相关性分析

中图分类号 S563.1文献标识码 A文章编号 0517-6611（2020）11-0029-03

Abstract With feeding ramie （Boehmeria nivea L.） Zhongsizhu No.1 as the research objects， the dynamic changes and distribution of N， P， K， Ca and Mg in leaves and stems of feeding ramie were studied. Correlation between the content of five elements in leaves and stems of feeding ramie was analyzed. The results showed that the contents of the five elements of N， P， K， Ca and Mg in the leaves and stems of the feeding ramie were different. The selective absorption of N， P， K， Ca， Mg by leaves and stems of the feeding ramie was different. The element contents in leaves from high to low were in the order of N， Ca， K， Mg， P， and those in stem were in the order of N， K， Ca， Mg， P. The leaves had strong absorption and accumulation of N， Ca， Mg， and P， while more K was stored in the stem. There was an extremely positive correlation between Ca content and Mg content in the leaves. There was an extremely positive correlation between N content and K， Mg contents， and a positive correlation between N and Ca content in the stems. There was an extremely positive correlation between leaf N and stem N contents， and positive correlation between leaf N and stem Ca， Mg contents. There was an extremely negative correlation between leaf K and stem K contents， and a negative correlation with stem Mg content.

Key words Feeding ramie （Boehmeria nivea L.）;Element content;Dynamic change;Correlation analysis

飼草营养物质是动物营养的基础，动物正常生命活动中所必需的营养元素大部分都是从饲草中获取[1]。饲草的营养元素含量不仅对于其生长发育的生理生化过程具有极其重要的作用，而且对于评定其营养价值以及放牧家畜营养状况诊断都具有重要意义[2]。因此，动物营养学家在研究动物营养的同时，对饲草营养元素的吸收、积累、动态及相关性也进行了大量的深入研究[3-5] 。

苎麻（Boehmeria nivea L.）是荨麻科苎麻属多年生草本植物，不仅是一种优良的天然纤维作物，近年来还被作为高品质的青绿饲草用于饲喂家畜[6-7]。

近年来很多关于饲用苎麻的研究，但是主要集中在饲用苎麻作为饲草营养价值评定[8-9]，但是关于饲用苎麻作为饲草其营养元素吸收、积累、动态变化的研究鲜有报道。……