DOI: 10.1016/j.foreco.2016.09.049
Scopus记录号: 2-s2.0-84991737248
论文题名: Wood decomposition by microbes and macroinvertebrates, and soil CO2 efflux vary in response to throughfall reduction and fertilization in a loblolly pine (Pinus taeda L.) plantation
作者: Zhang Y. ; Vogel J.G. ; Meek C. ; Will R. ; Wilson D. ; West J.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2016
卷: 382 起始页码: 10
结束页码: 20
语种: 英语
英文关键词: Decomposition
; Fertilization
; Loblolly pine
; Macroinvertebrate
; Throughfall reduction
Scopus关键词: Bacteria
; Carbon
; Climate models
; Decomposition
; Ecology
; Ecosystems
; Forestry
; Microorganisms
; Moisture
; Nutrients
; Reduction
; Soils
; Wood
; Fertilization
; Loblolly pine
; Loblolly pine (pinus taeda l.)
; Loblolly pine plantations
; Macroinvertebrates
; Nutrient availability
; Throughfall
; Wood decompositions
; Carbon dioxide
; Pinus taeda
英文摘要: Climate and nutrient availability modify the rate of carbon loss from soil and detrital pools in forest ecosystems. In a managed loblolly pine (Pinus taeda L.) plantation, we examined how reduced throughfall and fertilization affected wood decomposition and soil CO2 efflux. For ∼1.5 years, soil CO2 efflux and the mass loss of Pinus wood sticks were examined in relation to soil temperature and moisture and the accumulation of soil NH4 + and NO3 − for a factorial combination of two treatments: a 30% throughfall reduction (TR) treatment, fertilization with nutrient additions typical for this plantation type (224 kg/ha N, 64 kg/ha P and 67 kg/ha K), and a combined treatment. Wood mass loss was estimated separately for substrates affected by only microbes and those with visual signs (e.g. tunnels) of macroinvertebrate consumption. For the 426 days of the experiment, wood sticks decomposed only by microbes lost 3–6% of their mass while those also tunneled by macroinvertebrates lost 35–45% of their mass. By the end of the study macroinvertebrates had tunneled into 54% of all sticks across treatments. Because of macroinvertebrates, fertilization increased wood decomposition overall, despite significantly lower decomposition occurring in fertilized plots for sticks only decomposed by microbes. The TR treatment decreased wood decomposition but there was an interaction with location, where inhibition occurred near trees and under throughfall excluders but not at the midpoint between two planted rows. Wood sticks placed inside a collar used to measure soil CO2 efflux also decomposed significantly slower than all other locations. Soil CO2 efflux was inhibited by fertilization, primarily in August when temperatures were at the annual maximum. The depressed soil CO2 efflux from fertilization may have been the result of increased N availability, as fertilization stimulated NO3 − production. The main effect of TR on soil CO2 efflux or N availability was not significant, but the TR effect on soil CO2 efflux interacted with time, reflecting generally lower efflux on different dates relative to non-TR treatments. These results suggest ecosystem C loss from soil CO2 efflux was relatively insensitive to throughfall reduction, but wood decomposition was sensitive to both fertilization and lowered moisture availability. However for wood decomposition, the positive fertilization effect was dependent on macroinvertebrates, whose response to fertilization was the opposite to that of both microbes and soil CO2 efflux. Predicting the fate of woody detritus in loblolly pine plantations may require models that include the response of macroinvertebrates to climate and management. © 2016 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/64644
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Ecosystem Science and Management, Texas A&M University, College Station, TX, United States; Natural Resource Ecology and Management, Oklahoma State University, 008C Ag Hall, Stillwater, OK, United States; School of Forest Resources and Conservation, University of Florida, PO Box 110410, Gainesville, FL, United States
Recommended Citation:
Zhang Y.,Vogel J.G.,Meek C.,et al. Wood decomposition by microbes and macroinvertebrates, and soil CO2 efflux vary in response to throughfall reduction and fertilization in a loblolly pine (Pinus taeda L.) plantation[J]. Forest Ecology and Management,2016-01-01,382