Xiao Chun-Wang, Yuste J Curiel, Janssens I A, Roskams P, Nachtergale L, Carrara A, Sanchez B Y, Ceulemans R
Department of Biology, Research Group of Plant and Vegetation Ecology, University of Antwerpen (UIA), Universiteitsplein 1, B-2610 Wilrijk, Belgium.
Tree Physiol. 2003 Jun;23(8):505-16. doi: 10.1093/treephys/23.8.505.
We estimated above- and belowground biomass and net primary production (NPP) of a 73-year-old Scots pine (Pinus sylvestris L.) forest stand in the Belgian Campine region. Total biomass for the stand was 176 Mg ha(-1), of which 74.4% was found in stems. The root system contained 12.6% of total biomass, most of it in coarse roots (> 5 mm). Fine roots (< 5 mm) comprised only about 1.7% of total biomass, and more than 50% of fine root biomass was retrieved in the litter layer and the upper 15 cm of the mineral soil. The ratio of belowground biomass to aboveground biomass was 0.14, which is lower than that of other Scots pine forests and other coniferous forests. Between 1995 and 2001, mean annual NPP was 11.2 Mg ha(-1) year(-1), of which 68.7% was allocated to aboveground compartments. Stems, needles and cones made relatively high contributions to total NPP compared with branches. However, branch NPP was possibly underestimated because litterfall of big branches was neglected. The proportion of total NPP in belowground components was 31.3%. Coarse root NPP (2% of total) was low compared with its biomass. Fine root NPP was 3.3 Mg ha(-1) year(-1), representing about 29.5% of total NPP; however, the estimate of fine root NPP is much more uncertain than NPP of aboveground compartments. The ratio NPP/GPP (gross primary production) was 0.32, which was low compared with other coniferous forests.
我们估算了比利时坎皮讷地区一片73年生欧洲赤松（Pinus sylvestris L.）林分的地上和地下生物量以及净初级生产力（NPP）。该林分的总生物量为176 Mg·ha⁻¹，其中74.4%存在于树干中。根系包含总生物量的12.6%，大部分在粗根（>5 mm）中。细根（<5 mm）仅占总生物量的约1.7%，且超过50%的细根生物量在凋落物层和矿质土壤上部15 cm中被获取。地下生物量与地上生物量之比为0.14，低于其他欧洲赤松林和其他针叶林。在1995年至2001年期间，年均NPP为11.2 Mg·ha⁻¹·年⁻¹，其中68.7%分配到地上部分。与树枝相比，树干、针叶和球果对总NPP的贡献相对较高。然而，树枝的NPP可能被低估了，因为大枝的凋落物被忽略了。地下部分在总NPP中的比例为31.3%。粗根NPP（占总量的2%）与其生物量相比很低。细根NPP为3.3 Mg·ha⁻¹·年⁻¹，约占总NPP的29.5%；然而，细根NPP的估算比地上部分的NPP更不确定。NPP与总初级生产力（GPP）的比值为0.32，与其他针叶林相比很低。
