Early Goose Arrival Increases Soil Nitrogen Availability More Than an Advancing Spring in Coastal Western Alaska
Early Goose Arrival Increases Soil Nitrogen Availability More Than an Advancing Spring in Coastal Western Alaska
复制标题
阿拉斯加西部沿海地区,鹅的提前到来比春天的到来更能提高土壤氮素的利用率
DOI:
10.1007/s10021-019-00472-9
复制
发表时间:
2020
期刊:
影响因子:
3.7
通讯作者:
Welker, Jeffrey M.
中科院分区:
文献类型:
--
作者:
Choi, Ryan T.;Beard, Karen H.;Kelsey, Katharine C.;Leffler, A. Joshua;Schmutz, Joel A.;Welker, Jeffrey M.
An understudied aspect of climate change-induced phenological mismatch is its effect on ecosystem functioning, such as nitrogen (N) cycling. Migratory herbivore arrival time may alter N inputs and plant–herbivore feedbacks, whereas earlier springs are predicted to increase N cycling rates through warmer temperatures. However, the relative importance of these shifts in timing and how they interact to affect N cycling are largely unknown. We conducted a 3-year factorial experiment in coastal western Alaska that simulated different timings of Pacific black brant (Branta bernicla nigricans) arrival (3 weeks early, typical, 3 weeks late, or no-grazing) and the growing season (ca. 3 weeks advanced and ambient) on adsorbed and mobile inorganic (NH4+–N, NO3−–N) and mobile organic N (amino acid) pools. Early grazing increased NH4+–N, NO3−–N, and amino acids by 103%, 119%, and 7%, respectively, whereas late grazing reduced adsorbed NH4+–N and NO3−–N by 16% and 17%, respectively. In comparison, the advanced growing season increased mobile NH4+–N by 26%. The arrival time by geese and the start of the season did not interact to influence soil N availability. While the onset of spring in our system is advancing at twice the rate of migratory goose arrival, earlier goose migration is likely to be more significant than the advances in springs in influencing soil N, although both early goose arrival and advanced springs are likely to increase N availability in the future. This increase in soil N resources can have a lasting impact on plant community composition and productivity in this N-limited ecosystem.
登录
查看更多内容
影响因子:
2.7
作者:
C. Blubaugh;Ivy V. Widick;I. Kaplan
通讯作者:
I. Kaplan
DOI:
--
发表时间:
2000
期刊:
影响因子:
--
作者:
M. Jorgenson
通讯作者:
M. Jorgenson
影响因子:
1.7
作者:
J. Welker;I. Jónsdóttir;J. Fahnestock
通讯作者:
J. Fahnestock
影响因子:
1.3
作者:
R. Ruess;D. Uliassi;C. Mulder;Brian T Person
通讯作者:
Brian T Person
影响因子:
6.7
作者:
Kelsey, Katharine C;Leffler, A Joshua;Beard, Karen H;Choi, Ryan T;Schmutz, Joel A;Welker, Jeffery M
通讯作者:
Welker, Jeffery M