Acacia nilotica-based traditional agroforestry system: effect on paddy crop and management
Acacia nilotica-based traditional agroforestry system: effect on paddy crop and management
复制标题
以金合欢为基础的传统农林复合系统：对水稻作物和管理的影响
作者：
S. Bargali;K. Bargali;L. Singh;Lekha Ghosh;M. Lakhera
以阿拉伯相思（Acacia nilotica（L.）Willd. ex Del（6 - 28岁）在恰蒂斯加尔亚湿润地区的传统农林系统。在自然条件下（无任何树木管理措施）和树木管理条件下（砍掉10%的树基枝条），评价了该树对不同水稻（Oryza sativa）作物参数（植株密度、株高、有效分蘖、地上总生物量和籽粒产量）的影响。在三个方向（从树干中心穿过的中心线，以及该中心直线的左右）和四个距离（距树基1、3、5和7 m）处获取生长和生产力参数。树木对作物的影响在距离树干1 m处最大。这些数据还与不同的作物参数进行了比较，在开放领域（超出了树冠层的范围）。随着树龄、冠幅和胸径的增加，水稻生产力从9年生的4.7%下降到28年生的28.8%。而在6年生树下，籽粒产量增加（4%）。随着冠幅的增大，植株密度和有效分蘖数也随之降低。减产率与树龄、冠幅、胸径呈显著正相关。在去除10%的基础树枝后（12 ~ 28年生），树冠直径减小（0.81 ~ 3.77%），密度（0.05 - 1%），有效分蘖（1.19 - 5.8%）和粮食产量结果表明，在不修剪枝条的条件下，株高显著降低（0.09 ~ 1.32%），株高显著增加（1.52 ~ 2.92%）。
A study was conducted in an age series of Acacia nilotica (L.) Willd. ex Del (6―28 years old)-based traditional agroforestry system in the sub-humid region of Chhattisgarh. The effects of this tree on different rice (Oryza sativa) crop parameters (plant density, plant height, effective tillers, total aboveground biomass and grain yield) under natural conditions (without any management practices in trees) and under tree management conditions (cutting of 10% of basal tree branches) were evaluated. The growth and productivity parameters were taken in three directions (a central line passing from the centre of the tree bole, and right and left to this central straight line) and at four distances (1, 3, 5 and 7 m from the tree base). The impact of the tree on the crop was maximum at 1 m distance from the tree trunk. The data were also compared with different crop parameters in the open field (beyond the reach of the tree canopy). With increase in tree age, crown diameter and diameter at breast height (DBH), rice productivity reduced from 4.7 (under 9-yr-old tree) to 28.8% (under 28-yr-old tree). Whereas under 6-yr-old tree, there was an increase (4%) in grain yield. With increase in tree canopy size the plant density and effective tillers also reduced. Per cent yield reduction showed significant positive correlation with tree age, crown diameter and DBH. After the removal of 10% of basal tree branches (in 12―28-yr-old trees), the crown diameter of trees was reduced (0.81― 3.77%), plant density (0.05―1%), effective tillers (1.19― 5.8%) and grain yield (1.52―2.92%) increased significantly and plant height decreased (0.09―1.32%) over the unmanaged (without cutting the tree branches) condition.