Lehmann lovegrass live component biomass and chemical composition
Lehmann lovegrass live component biomass and chemical composition
复制标题
莱曼爱情草活性成分生物量和化学成分
DOI：
10.2307/4002564
复制
发表时间：
1992
期刊：
影响因子：
--
通讯作者：
J. R. Cox
中科院分区：
文献类型：
--
作者：
J. R. Cox
莱曼牧草(Eragrostis Lehmanniana Nees)是一种来自南部非洲的多年生丛生牧草，正在取代亚利桑那州的本土牧草。入侵后，生物质产量和质量可能会发生变化。本研究测定了干湿两年间莱曼草地早熟禾活叶、茎和籽粒的产量和化学成分。在3年中，绿叶生物量在8月上旬达到峰值78+/-14gm-2(平均值+/-SE)，绿秆生物量在10月中旬达到峰值103+/-21gm-2，绿色穗数在8月中旬达到峰值18+/-12gm-2。叶片和茎的生长高峰对应于低粗蛋白(2.5%)和中等磷(0.23-0.25%)水平，而籽粒生长高峰对应于高粗蛋白(710%)和中等磷(0.19-0.29%)水平。青秆中没有粗蛋白和磷的峰。在莱曼牧草饲料中，粗蛋白应满足动物全年约半年的需要，而磷应全年充足。在本地牧草中，粗蛋白质全年都是充足的，因为动物有选择地吃杂草、草和灌木，但除仲夏外，磷不符合动物的需要。
Lehmann lovegrass (Eragrostis lehmanniana Nees), a perennial bunchgrass from southern Africa, is replacing native grasses in Arizona. After the invasion, biomass production and quality may change. This study was conducted to determine the production and chemical composition of live Lehmann lovegrass leaves, culms, and seedheads during wet and dry years. During 3 years, green leaf biomass peaked at 78 +/- 14 g m-2 (mean +/- SE) in early August, green culms peaked at 103 +/- 21 g m-2 in mid October, and green seedheads peaked at 18 +/- 12 g m-2 in mid August. Leaf and culm growth peaks correspond with low crude protein (2.5%) and moderate phosphorus (0.23-0.25%) levels while seedhead growth peaks correspond with high crude protein (7-10%) and moderate phosphorus (0.19-0.29%) levels. There were no crude protein and phosphorus peaks in green culms. In Lehmann lovegrass forage, crude protein should meet animal requirements for about half the year while phosphorus should be adequate throughout the year. In native forages, crude protein is adequate throughout the year because animals selectively graze forbs, grasses, and shrubs but phosphorus does not meet animal requirements except in mid-summer.