Fine root productivity varies along nitrogen and phosphorus gradients in high-rainfall mangrove forests of Micronesia

被引:61
作者
Cormier, Nicole [1 ,2 ]
Twilley, Robert R. [2 ]
Ewel, Katherine C. [1 ]
Krauss, Ken W.
机构
[1] US Forest Serv, USDA, Inst Pacific Isl Forestry, Hilo, HI 96720 USA
[2] Univ Louisiana Lafayette, Dept Biol, Lafayette, LA 70506 USA
关键词
Carbon allocation; Roots; Nutrients; Productivity; Mangrove; Pacific high islands; Micronesia; RHIZOPHORA-MANGLE; NUTRIENT ENRICHMENT; ORGANIC-MATTER; STANDING CROP; BIOMASS; DYNAMICS; CARBON; GROWTH; AVAILABILITY; ECOSYSTEM;
D O I
10.1007/s10750-015-2178-4
中图分类号
Q17 [水生生物学];
学科分类号
071004 ;
摘要
Belowground biomass is thought to account for much of the total biomass in mangrove forests and may be related to soil fertility. The Yela River and the Sapwalap River, Federated States of Micronesia, contain a natural soil resource gradient defined by total phosphorus (P) density ranging from 0.05 to 0.42 mg cm(-3) in different hydrogeomorphic settings. We used this fertility gradient to test the hypothesis that edaphic conditions constrain mangrove productivity through differential allocation of biomass to belowground roots. We removed sequential cores and implanted root ingrowth bags to measure in situ biomass and productivity, respectively. Belowground root biomass values ranged among sites from 0.448 +/- A 0.096 to 2.641 +/- A 0.534 kg m(-2). Root productivity (roots a parts per thousand currency sign20 mm) did not vary significantly along the gradient (P = 0.3355) or with P fertilization after 6 months (P = 0.2968). Fine root productivity (roots a parts per thousand currency sign2 mm), however, did vary significantly among sites (P = 0.0363) and ranged from 45.88 +/- A 21.37 to 118.66 +/- A 38.05 g m(-2) year(-1). The distribution of total standing root biomass and fine root productivity followed patterns of N:P ratios as hypothesized, with larger root mass generally associated with lower relative P concentrations. Many of the processes of nutrient acquisition reported from nutrient-limited mangrove forests may also occur in forests of greater biomass and productivity when growing along soil nutrient gradients.
引用
收藏
页码:69 / 87
页数:19
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