Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1016/j.foreco.2019.02.017 |
Assessing the role of native herbaceous legumes in the nitrogen cycle of regularly burned loblolly pine forests | |
Hendricks, Joseph J.; Holland, J. Blake; Hubbartt, John S. | |
2019-04-15 | |
发表期刊 | FOREST ECOLOGY AND MANAGEMENT |
ISSN | 0378-1127 |
EISSN | 1872-7042 |
出版年 | 2019 |
卷号 | 438页码:123-133 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Prescribed burning is one of the most commonly used management practices in pine (Pinus spp.) forests of the southeastern United States. There is concern, however, that burning may lead to excessive losses of nitrogen (N), thereby decreasing forest productivity. The N losses due to burning may be potentially countered via symbiotic N-2-fixation by native and naturalized herbaceous legumes that may thrive in burned forests. However, the rates and controls of N input via legume N-2-fixation in these ecosystems are poorly understood. The objectives of this study were to measure legume abundance, biomass, N-2-fixation, substrate quality, and associated environmental controls in regularly burned loblolly pine (P. taeda) forests. The study sites were located in four management blocks at the Piedmont National Wildlife Refuge. This assessment revealed a total of 23 legume species in 9 genera. Legume abundance averaged 12.95 +/- 2.30 individuals m(-2), and collectively Centrosema virginianum, Chamaecrista nictitans, Desmodium marilandicum, Galactia volubihs, and Lespedeza procumbens constituted 70.8% of the total legume abundance. Legumes comprised 17.1% of the understory aboveground biomass, and legume foliage, stem, and total (foliage + stem) biomass estimates averaged 15.38 +/- 3.18, 20.88 +/- 4.01, 36.26 +/- 6.95 g m(-2), respectively. Legume foliar N concentration averaged 2.22 +/- 0.06% (ranging from 1.42-2.83%), and all legume foliar N concentrations were significantly higher than the average foliar values for blackberry (Rubus spp., 1.10 +/- 0.05%) and the aggregate of non-leguminous forbs (1.03 +/- 0.08%) that grew concurrently with the legumes in the study sites. N-2-fixation assessments, based on the differential between legume and non-N-2-fixing reference plant foliar N concentrations, indicated that approximately 50% of legume N was derived from the atmosphere. Legume foliage tissues exhibited relatively high substrate quality indices such as high N concentrations, low lignin concentrations (average of 14.3 +/- 1.9%), and correspondingly low lignin:N ratios (average of 6.7 +/- 0.9) indicative of tissues that exhibit rapid mass loss and N mineralization rates during decomposition. Canopy openness was the environmental variable that was most strongly correlated with foliar N and areal biomass among the dominant legume species. The estimated N input of 0.14 g m(-2) yr(-1) via N-2-fixation may compensate for N losses due to relatively low intensity and infrequent understory burns during a stand rotation. Additional studies are needed to more comprehensively assess legume N-2-fixation inputs, associated environmental constraints, and practical field applications which may increase N input via symbiotic N-2-fixation in regularly burned pine forest ecosystems. |
英文关键词 | Prescribed burning Native herbaceous legumes Nitrogen N-2-fixation N-15 natural abundance Substrate quality Lignin Loblolly pine forest Piedmont ecoregion |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000463120500015 |
WOS关键词 | PRESCRIBED FIRE ; LITTER QUALITY ; FOLIAR LITTER ; SOIL ; DECOMPOSITION ; N-2-FIXATION ; PRODUCTIVITY ; AVAILABILITY ; ECOSYSTEMS ; PATTERNS |
WOS类目 | Forestry |
WOS研究方向 | Forestry |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/182319 |
专题 | 气候变化 |
作者单位 | Univ West Georgia, Dept Biol, 1601 Maple St, Carrollton, GA 30118 USA |
推荐引用方式 GB/T 7714 | Hendricks, Joseph J.,Holland, J. Blake,Hubbartt, John S.. Assessing the role of native herbaceous legumes in the nitrogen cycle of regularly burned loblolly pine forests[J]. FOREST ECOLOGY AND MANAGEMENT,2019,438:123-133. |
APA | Hendricks, Joseph J.,Holland, J. Blake,&Hubbartt, John S..(2019).Assessing the role of native herbaceous legumes in the nitrogen cycle of regularly burned loblolly pine forests.FOREST ECOLOGY AND MANAGEMENT,438,123-133. |
MLA | Hendricks, Joseph J.,et al."Assessing the role of native herbaceous legumes in the nitrogen cycle of regularly burned loblolly pine forests".FOREST ECOLOGY AND MANAGEMENT 438(2019):123-133. |
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