Whole-tree dormant season nitrogen pools for different species receiving combinations of fertilization and irrigation after one short rotation
Journal Article
·
· Forest Ecology and Management
- Savannah River Ecology Laboratory, Aiken, SC (United States); University of Georgia Savannah River Ecology Laboratory
- University of Idaho, Moscow, ID (United States)
- Clemson University, SC (United States)
- Savannah River Ecology Laboratory, Aiken, SC (United States); University of Georgia, Athens, GA (United States)
Our understanding of the accretion and distribution of tree tissue nitrogen (N) pools across a variety of species and genotypes suitable for short-rotation woody crop (SRWC) production in response to water and N availability remains limited. We measured dormant-season, rotation-length, whole-tree N pools for five tree genotypes from four species (two eastern cottonwood, Populus deltoides Bartr., genotypes; American sycamore, Platanus occidentalis L.; American sweetgum, Liquidambar styraciflua L.; and loblolly pine, Pinus taeda L.) receiving irrigation (I), fertilization (F), their combination (IF), or no resources manipulation (C). Our results demonstrate that foliar nitrogen concentration [N] responded to fertilization but was constrained within genotype-specific ranges and varied temporally. Tree genotypes differed in their composite and component tissue N content (NC), and these differences mostly reflected tissue mass (i.e., larger components and trees resulted in higher NC). Resource amendments (I, F, IF) resulted in up to 3.8-fold increases in NC compared with C, which were most pronounced for sycamore and sweetgum with F and IF treatments, respectively. By the end of the rotation, forest stands accumulated 73 to 452 kg N ha–1 in tree tissues with 40 – 78 % distributed aboveground and 22 – 60 % distributed belowground. A critical difference between genotypes was that all hardwoods exhibited larger belowground N distributions than the evergreen conifer. Our results stress the importance of belowground N pools and highlight differences among genotypes. Furthermore, our study underscores valuable information about N pools across genotypes suitable for SRWC production, which can be leveraged to inform fertilization plans and devise sustainable nutrient management as production expands across marginal lands.
- Research Organization:
- Savannah River Ecology Laboratory, Aiken, SC (United States)
- Sponsoring Organization:
- USDA National Institute of Food and Agriculture, Agriculture and Food Research Initiative; USDOE
- Grant/Contract Number:
- EM0005228
- OSTI ID:
- 2228453
- Journal Information:
- Forest Ecology and Management, Journal Name: Forest Ecology and Management Vol. 529; ISSN 0378-1127
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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