Contrasting seasonal patterns of fine root production for blue oaks (Quercus douglasii) and annual grasses in California oak woodland

被引:30
作者
Cheng, XM [1 ]
Bledsoe, CS [1 ]
机构
[1] Univ Calif Davis, Dept Land Air & Water Resources, Davis, CA 95616 USA
基金
美国国家科学基金会;
关键词
annual grasses; blue oaks; fine root production; ingrowth cores; nutrient enrichment; seasonal effects;
D O I
10.1023/A:1015723314433
中图分类号
S3 [农学(农艺学)];
学科分类号
0901 ;
摘要
In a blue oak woodland in NE California, we used root ingrowth cores to study seasonal patterns of fine root (< 2 mm diameter) production (FRP) for annual grasses and blue oaks (Quercus douglasii Hook and Arn.). At each of three sites (River, Upland and Hilltop) there were three studies: a short-term seasonal study, a long-term cumulative study and a core nutrient enrichment study. In the short-term study, ingrowth cores were installed and harvested in 3-month intervals. Grass and oak FRP dominated in different seasons. Grass FRP was greater in fall (Oct-Dec, 26.0 g m(-)2 month(-)1(gmm)) and winter (Jan-Mar, 18.1 gmm), lower in spring (Apr-Jun, 2.9 gmm) and negligible in summer (July-Sep). In contrast, oak FRP was greater in spring (6.1 gmm) with lower, but significant summer growth (2.9 gmm). Grass FRP declined steadily with soil depth (0-40 cm) in all seasons. Oak FRP changed little with soil depth, except in the summer, when production was greatest at lower soil depths. In the long-term study, ingrowth cores were installed and harvested after 3, 6, 9 and 12 months. Oak annual FRP was greater in the long-term study than in the short-term study at the River and Upland sites. Thus production in the short-term study may be an underestimate, due to disturbance effects. Nutrient enrichment of cores with N-P-K increased grass FRP, but surprisingly, decreased oak FRP, suggesting that annual grasses may have competitive advantages in nutrient enriched soil.
引用
收藏
页码:263 / 274
页数:12
相关论文
共 46 条
[1]  
ALLEN MF, 1991, ECOLOGY MYCORRHIZAE, P116
[2]  
[Anonymous], 1981, MADRONO
[3]  
[Anonymous], 1982, AGRONOMY MONOGRAPH 2
[4]   EFFECTS OF DIFFERENT FERTILIZER TREATMENTS ON ECTOMYCORRHIZAL COLONIZATION POTENTIAL IN 2 SCOTS PINE FORESTS IN SWEDEN [J].
ARNEBRANT, K ;
SODERSTROM, B .
FOREST ECOLOGY AND MANAGEMENT, 1992, 53 (1-4) :77-89
[5]  
Brundrett M, 1996, WORKING MYCORRHIZAS, DOI 10.22004/ag.econ.119356
[6]   FINE-ROOT GROWTH PHENOLOGY, PRODUCTION, AND TURNOVER IN A NORTHERN HARDWOOD FOREST ECOSYSTEM [J].
BURKE, MK ;
RAYNAL, DJ .
PLANT AND SOIL, 1994, 162 (01) :135-146
[7]   Relationships between fine root dynamics and nitrogen availability in Michigan northern hardwood forests [J].
Burton, AJ ;
Pregitzer, KS ;
Hendrick, RL .
OECOLOGIA, 2000, 125 (03) :389-399
[8]   FACILITATION AND INTERFERENCE OF QUERCUS-DOUGLASII ON UNDERSTORY PRODUCTIVITY IN CENTRAL CALIFORNIA [J].
CALLAWAY, RM ;
NADKARNI, NM ;
MAHALL, BE .
ECOLOGY, 1991, 72 (04) :1484-1499
[9]   SEASONAL PATTERNS OF NUTRIENT DEPOSITION IN A QUERCUS-DOUGLASII WOODLAND IN CENTRAL CALIFORNIA [J].
CALLAWAY, RM ;
NADKARNI, NM .
PLANT AND SOIL, 1991, 137 (02) :209-222
[10]  
CANADELL J, 1995, ECOL STU AN, V108, P177, DOI DOI 10.1007/978-1-4612-2490-7_8