Effects of clump spacing on nutrient distribution and root activity of Dendrocalamus strictus in the humid region of Kerala, peninsular India

Kittur, B. H.; Sudhakara, K.; Kumar, B. Mohan; Kunhamu, T. K.; Sureshkumar, P.

doi:10.1007/s11676-017-0391-x

Cited by 6 publications

(1 citation statement)

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“…The horizontal distribution trend of the poplar FRLD in the PWW system was the same as that of the inorganic nitrogen reduction, but the poplar FRLD in the PWN system first decreased and then increased by a small margin with increasing distance from tree row (Figure 6a,b). A possible reason for the difference is the poplar planting spacing in the PWN and PWW systems (Kittur et al, 2017; Ma et al, 2014). There was an overlapping region of tree roots at the middle site of the PWN system due to the narrowly spaced poplar arrangement, so the FRLD slightly increased at SP 4 (De et al, 2011).…”

Section: Discussionmentioning

confidence: 99%

Effects of poplar intercropping systems on reducing the concentration of different forms of inorganic nitrogen in the soil profile

Wang

Yang

et al. 2023

Land Degrad Dev

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This study focused on understanding how different spacing arrangements of poplar (Populus deltoides)–wheat (Triticum aestivum) agroforestry systems and the processes of the tree and wheat roots in these systems impact the elimination efficiency of inorganic nitrogen from soil. Three planting systems were tested: a monoculture wheat system (control), a widely spaced wheat–poplar system (PWW) and a narrowly spaced wheat–poplar system (PWN). Soil and root samples were collected in four different soil layers (0–20, 20–40, 40–60, and 60–100 cm) at four different sampling sites (PWN: 0, 1.5, 2.5, and 3.5 m; PWW: 0, 1.5, 3.5, and 7 m from tree row, respectively). The nitrate–nitrogen (), ammonium–nitrogen (), and nitrite–nitrogen () in the soil samples were analyzed to determine the elimination efficiency of the different systems. The results indicated that the concentration and soil accumulation content reduction of inorganic nitrogen in the two intercropping systems, especially in the PWW system, were encouraging compared to those in the control system. The and concentration reductions and poplar fine root length density (FRLD) were higher at the sampling point near the poplar row, especially in surface soil (p < 0.05), but the distribution of the wheat FRLD decreased with soil depth and proximity to the poplar trunk. Furthermore, the poplar and wheat FRLD had significant positive relationships with the concentration reduction of inorganic nitrogen. In conclusion, poplar–agroforestry systems should be considered as an important method for controlling nonpoint pollution from farmland.

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Section: Discussionmentioning

confidence: 99%