Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1007/s10021-010-9353-2 |
The Role of Photodegradation in Surface Litter Decomposition Across a Grassland Ecosystem Precipitation Gradient | |
Brandt, L. A.1,2; King, J. Y.1,3,4; Hobbie, S. E.1; Milchunas, D. G.5; Sinsabaugh, R. L.6 | |
通讯作者 | King, J. Y. |
来源期刊 | ECOSYSTEMS
![]() |
ISSN | 1432-9840 |
出版年 | 2010 |
卷号 | 13期号:5页码:765-781 |
英文摘要 | Differences in litter decomposition patterns among mesic, semiarid, and arid grassland ecosystems cannot be accurately explained by variation in temperature, moisture, and litter chemistry alone. We hypothesized that ultraviolet (UV) radiation enhances decomposition in grassland ecosystems via photodegradation, more so in arid compared to mesic ecosystems, and in litter that is more recalcitrant to microbial decomposition (with high compared to low lignin concentrations). In a 2-year field study, we manipulated the amount of UV radiation reaching the litter layer at three grassland sites in Minnesota, Colorado, and New Mexico, USA, that represented mesic, semiarid, and arid grassland ecosystems, respectively. Two common grass leaf litter types of contrasting lignin:N were placed at each site under screens that either passed all solar radiation wavelengths or passed all but UV wavelengths. Decomposition was generally faster when litter was exposed to UV radiation across all three sites. In contrast to our hypothesis, the contribution of photodegradation in the decomposition process was not consistently greater at the more arid sites or for litter with higher lignin content. Additionally, at the most arid site, exposure to UV radiation could not explain decomposition rates that were faster than expected given climate constraints or lack of N immobilization by decomposing litter. Although photodegradation plays an important role in the decomposition process in a wider range of grassland sites than previously documented, it does not fully explain the differences in decomposition rates among grassland ecosystems of contrasting aridity. |
英文关键词 | photodegradation litter decomposition ultraviolet (UV) radiation tallgrass prairie shortgrass steppe desert grassland lignin extracellular enzymes nitrogen immobilization precipitation gradient |
类型 | Article |
语种 | 英语 |
国家 | USA |
收录类别 | SCI-E |
WOS记录号 | WOS:000280260100011 |
WOS关键词 | UV-B RADIATION ; ORGANIC-MATTER DECOMPOSITION ; NORTHERN CHIHUAHUAN DESERT ; LONG-TERM ; PLANT LITTER ; ENZYME-ACTIVITY ; ULTRAVIOLET-RADIATION ; NITROGEN ADDITION ; LIGNIN CONTROL ; GLOBAL-SCALE |
WOS类目 | Ecology |
WOS研究方向 | Environmental Sciences & Ecology |
来源机构 | Colorado State University ; E18 |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/163947 |
作者单位 | 1.Univ Minnesota, Dept Ecol Evolut & Behav, St Paul, MN 55108 USA; 2.US Forest Serv, No Inst Appl Carbon Sci, USDA, Milwaukee, WI 53202 USA; 3.Univ Minnesota, Dept Soil Water & Climate, St Paul, MN 55108 USA; 4.Univ Calif Santa Barbara, Dept Geog, Santa Barbara, CA 93106 USA; 5.Colorado State Univ, Forest Rangeland & Watershed Stewardship Dept, Ft Collins, CO 80523 USA; 6.Univ New Mexico, Dept Biol, Albuquerque, NM 87131 USA |
推荐引用方式 GB/T 7714 | Brandt, L. A.,King, J. Y.,Hobbie, S. E.,et al. The Role of Photodegradation in Surface Litter Decomposition Across a Grassland Ecosystem Precipitation Gradient[J]. Colorado State University, E18,2010,13(5):765-781. |
APA | Brandt, L. A.,King, J. Y.,Hobbie, S. E.,Milchunas, D. G.,&Sinsabaugh, R. L..(2010).The Role of Photodegradation in Surface Litter Decomposition Across a Grassland Ecosystem Precipitation Gradient.ECOSYSTEMS,13(5),765-781. |
MLA | Brandt, L. A.,et al."The Role of Photodegradation in Surface Litter Decomposition Across a Grassland Ecosystem Precipitation Gradient".ECOSYSTEMS 13.5(2010):765-781. |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。