The whole-tree biomasses were 216.41 t/hm~2, 260.06 t/hm~2, 221.92 t/hm~2, 221.65 t/hm~2, 246.13 t/hm~2 and 201.04 t/hm~2, respectively, for the mixtures, and 201.04 t/hm~2 for the pure pine stand.
And the biomasses of Carex lanceolata,Bidens tripartita that are dominants were 656.7kg/hm\+2 and 462.1kg/hm\+2,respectively,and totally 1118.8kg/hm\+2 accounting for 15.81% in the total.
The results sho-w that, ( i ) the biomasses of standing crop were 4.25, 12.03, 38.05 and 23.62 ( t/ha ) for the foliage, branches, stems and roots system respectively;
With Zn~(2+)、Cd~(2+) and Pb~(2+) concentrations going above 200 mg/L,the root and aboveground biomasses of P.pratensis appeared to be inhibited,and the inhititory effects became intensified as the concentrations increased.
Zn2+、Cd2+和Pb2+在浓度超过200 m g/L时对早熟禾根系及地上生物量表现出抑制效应,并随着浓度的增加抑制效应增加.
2. The optimum concentration of N, P, K to poplar according to regression equation are N: 13.68~14.59mg/L, P:2.12~2.52mg/L, K:1.71 ~3.10mg/L, and the corresponding total biomass is 21.71 g.
The results of the shrub relative growth study showed that the models W =a +b(D2H)+c(D2H)2,W = a(D2H)b,W = a+bD+cC+dH,W = a+b(CV)+c(CV)2 were suitable for describing the rela-tionship between shrub morphology factors and total biomass,branch biomass,leaf biomass and root biomass.
When the callus was cultured in the dark for 40 days,the total biomass reached 28.7 g/L and the content of baicalin and total flavonoids reached up to 167.4 mg/g and 354.6 mg/g,respectively.
Results indicated that the leaf area, stem and leaf biomass, and caliper of seedlings of all four poplar clones increased with the decrease in cutting density.
Leaf area index reached its highest level at the spacing of 40 cm×40 cm, while the aboveground biomass of the seedling on an area basis increased as the cutting density increased.
Root biomass, length, and the number of roots in every diameter class, for each soil layer and for each plant species, are regarded as observation variables.
A study on the biomass of fine roots and its relationship with water-stable aggregates (WSA) was conducted in two herbaceous models, triploid Populus tomentosa + Lolium multiflorum (TL) and triploid P.
Results showed that the biomass of fine roots (? 1 mm) in different layers varied in the following descending order: upper layer, middle layer and lower layer, at approximate ratios of 50:30:20.
The paleosoils were found to be characterized by lower total and active biomasses and a lower proportion of active microorganisms as compared to the modern background soils.
We studied species composition and population densities and biomasses in common species of algae, coelenterates, mollusks, and echinoderms and also the degree of substrate coverage by macrophytes and corals.
However, the ratio between the biomasses of predatory and nonpredatory animals in the same water body may vary seasonally and annually and differ in different parts of this water body.
Regression analysis of leaf biomass and total biomass of each branch against branch diameter (d), branch length (L), d3 and d2L was conducted with functions of linear, power and exponent.
Correlations were highly significant (P>amp;lt;0.001) for foliage biomass, branch biomass and total biomass, among which the equation of the total biomass was the highest.
生物量
biomass
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