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：

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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系统中的树是尾桉（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。