Soil nitrogen dynamics within profiles of a managed moist temperate forest chronosequence consistent with long-term harvesting-induced losses

被引:20
作者
Kellman, Lisa [1 ]
Kumar, Sanjeev [2 ]
Diochon, Amanda [3 ]
机构
[1] St Francis Xavier Univ, Dept Earth Sci, Antigonish, NS B2G 1C0, Canada
[2] Phys Res Lab, Geosci Div, Ahmadabad 380009, Gujarat, India
[3] Lakehead Univ, Dept Geol, Thunder Bay, ON P7B 5E1, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
ORGANIC-MATTER; MICROBIAL BIOMASS; 100-YEAR CHRONOSEQUENCE; COMMUNITY STRUCTURE; NUTRIENT DYNAMICS; SITE PREPARATION; WHOLE-TREE; CLEAR-CUT; CARBON; MINERALIZATION;
D O I
10.1002/2013JG002469
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
This study investigates whether clear-cut forest harvesting leads to alterations in the decadal-scale biogeochemical nitrogen (N) cycles of moist temperate forest ecosystems. Using a harvested temperate red spruce (Picea rubens Sarg.) forest chronosequence in Nova Scotia, Canada, representing <1 to >80 year old postharvest conditions, alongside a reference old-growth (125+ year old) site with no documented history of disturbance, we examine harvesting-related changes in soil N pools and fluxes. Specifically, we quantify soil N storage with depth and age across the forest chronosequence, examine changes in physical fractions and delta N-15 of soil N through depth and time, and quantify gross soil N transformation rates through depth and time using a N-15 isotope dilution technique. Our findings point to a large loss of total N in the soil pool, particularly within the deep soil (>20 cm) and organomineral fractions. A pulse of available mineralized N (as ammonium) was observed following harvesting (mean residence time (MRT)>6 days), but its MRT dropped to <1 day 80 years following harvesting, in contrast to the MRT of 2-3 days observed in the reference old-growth forest site. These mineralization patterns coupled with inferred leaching losses to groundwater are consistent with storage estimates that suggest soil N may not reaccrue for almost a century following this disturbance.
引用
收藏
页码:1309 / 1321
页数:13
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