![Long-term changes in productivity of eucalypt plantations under different harvest residue and nitrogen management practices: A modelling analysis [An article from: Forest Ecology and Management]](https://www.ebooknetworking.net/books/B00/0RR/bigB000RR6956.jpg)
Long-term changes in productivity of eucalypt plantations under different harvest residue and nitrogen management practices: A modelling analysis [An article from: Forest Ecology and Management]
Book Details
PublisherElsevier
ISBN / ASINB000RR6956
ISBN-13978B000RR6950
AvailabilityAvailable for download now
MarketplaceUnited States 🇺🇸
Description
This digital document is a journal article from Forest Ecology and Management, published by Elsevier in . The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
Sustaining productivity in short-rotation forest plantations over multiple rotations can be problematic, when nutrient inputs to soil are small compared to exports off-site during harvest. For example, there are concerns about sustained productivity of Eucalyptus globulus plantations growing on ex-pasture land in south-western Australia because nitrogen (N) inputs from fertilisation and leguminous species are low. One way of improving the N balance of the plantation system is through retention of tree residues produced during harvest operations. We used the Generic Decomposition And Yield (G'DAY) model of Carbon (C) and N cycling in plant and soil to investigate the relationship between soil N fertility and stem productivity when E. globulus planted on legume-based pasture land is grown over twenty 8-year rotations under different scenarios of harvest residue and N management. The scenarios included stemwood harvesting with retention of harvest residues, denoted ''single slash'' (SS), double the amount of harvest residues, denoted ''double slash'' (DS), no harvest residue (NS), burning of harvest residues and tree litter (B) and addition of fertiliser N equal to N removed in stemwood harvest (F). We parameterised and tested G'DAY using data from a field experiment conducted at two second-rotation E. globulus plantation sites with contrasting productivity. Experimental treatments at these sites included SS, DS, NS and B. With the model we were able to accurately reproduce observed stemwood growth of second-rotation stands for all treatments at both sites (r=0.99). Model simulations overestimated soil N mineralisation at the more productive site (relative error, E, ranged from -14 to -24), and underestimated it at the less productive site (+5
Description:
Sustaining productivity in short-rotation forest plantations over multiple rotations can be problematic, when nutrient inputs to soil are small compared to exports off-site during harvest. For example, there are concerns about sustained productivity of Eucalyptus globulus plantations growing on ex-pasture land in south-western Australia because nitrogen (N) inputs from fertilisation and leguminous species are low. One way of improving the N balance of the plantation system is through retention of tree residues produced during harvest operations. We used the Generic Decomposition And Yield (G'DAY) model of Carbon (C) and N cycling in plant and soil to investigate the relationship between soil N fertility and stem productivity when E. globulus planted on legume-based pasture land is grown over twenty 8-year rotations under different scenarios of harvest residue and N management. The scenarios included stemwood harvesting with retention of harvest residues, denoted ''single slash'' (SS), double the amount of harvest residues, denoted ''double slash'' (DS), no harvest residue (NS), burning of harvest residues and tree litter (B) and addition of fertiliser N equal to N removed in stemwood harvest (F). We parameterised and tested G'DAY using data from a field experiment conducted at two second-rotation E. globulus plantation sites with contrasting productivity. Experimental treatments at these sites included SS, DS, NS and B. With the model we were able to accurately reproduce observed stemwood growth of second-rotation stands for all treatments at both sites (r=0.99). Model simulations overestimated soil N mineralisation at the more productive site (relative error, E, ranged from -14 to -24), and underestimated it at the less productive site (+5
