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Shading effects on canopy and tillering characteristics of continuously stocked palisadegrass in a silvopastoral system in the Amazon biome
Grass and Forage Science ( IF 2.7 ) Pub Date : 2020-05-11 , DOI: 10.1111/gfs.12478
Fagner Junior Gomes 1 , Bruno Carneiro Pedreira 2 , Patrícia Menezes Santos 3 , Cristiam Bosi 1 , Carlos Guilherme Silveira Pedreira 1
Affiliation  

In silvopastoral (SP) systems, forage responses depend on the microenvironment in which the plants develop. Our objective was to evaluate canopy and tillering characteristics of shaded 'Marandu' palisadegrass [Brachiaria brizantha (Hochst A Rich) Stapf, syn. Urochloa brizantha] under continuous stocking in a SP system. Treatments were one full sun (FS) and three shaded systems (silvopasture, SP) corresponding to distances from tree groves: 7.5 m north (SP1), and 15 m (SP2) and 7.5 m south (SP3) studied during two rainy seasons (Year 1 and Year 2). The tree in the SP system was Eucalyptus urograndis (hybrid of Eucalyptus grandis W. Hill ex Maiden × Eucalyptus urophylla S. T. Blake). The photosynthetic active radiation was greater in FS (923 μmol m-2 s-1), followed by SP2 (811 μmol m-2 s-1), SP1 (727 μmol m-2 s-1) and SP3 (673 μmol m-2 s-1). Forage accumulation in FS was 15% greater than the mean of SP1, SP2 and SP3 (10,663 kg DM/ha). There was no difference in net accumulation of leaf, stem and dead material, averaging 3,302, 3,420 and 4,063 kg DM/ha respectively. Leaf accumulation and accumulation rate were greater in Year 2, and leaf accumulation rate was similar among treatments (19 kg DM ha−1 day−1). Leaf proportion increased 14% from Year 1 to Year 2. Specific leaf area was greater for treatments SP1 and SP3 (193 cm2/g). Tiller population density was similar across treatments in Year 1. Shaded palisadegrass maintains leaf productivity similar to FS under continuous stocking in an SP system.

中文翻译:

遮荫对亚马逊生物群落林牧系统中连续放养的木栅草冠层和分till特性的影响

在牧草(SP)系统中,草料响应取决于植物生长的微环境。我们的目标是评估带阴影的“ Marandu”木栅栏[ Brachiaria brizantha(Hochst A Rich)Stapf,syn。的冠层和分er特性。在SP系统中连续放养下Urochloa brizantha ]。处理方式为一个全日照(FS)和三个遮荫系统(silvopasture,SP),该系统与距树林的距离相对应:在两个雨季期间研究了北距7.5 m(SP1),北距15 m(SP2)和南距7.5 m(SP3)( 1年级和2年级)。SP系统中的树是尾Eucalyptus urograndis)Eucalyptus grandis W.Hill  ex Maiden×  Eucalyptus urophylla的杂交种)  ST Blake)。FS(923μmolm -2 s -1),SP2(811μmolm -2 s -1),SP1(727μmolm -2 s -1)和SP3(673μmolm)的光合活性辐射更大。-2 s -1)。FS中的草料积累量比SP1,SP2和SP3(10,663 kg DM / ha)的平均值大15%。叶片,茎和死亡材料的净积累量没有差异,分别为每公顷3,302、3,420和4,063 kg DM。在第2年中,叶片的积累和积累速率更高,而各处理之间的叶片积累速率相似(19 kg DM ha -1 天-1)。从第1年到第2年,叶片比例增加了14%。处理SP1和SP3的比叶面积更大(193 cm 2 / g)。在第1年中,不同处理间的分population人口密度相似。在SP系统中连续放养的情况下,遮荫木瓜的叶片生产力与FS相似。
更新日期:2020-05-11
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