scholarly journals Relative contribution of environmental and nutritional variables to net primary production of Cynodon dactylon (Linn.) Pers in the riparian zone of a Three Gorges tributary

2020 ◽  
Vol 10 (14) ◽  
pp. 7073-7081 ◽  
Author(s):  
Junjie Lin ◽  
Shuang Zhou ◽  
Dan Liu ◽  
Shuai Zhang ◽  
Zhiguo Yu ◽  
...  
Keyword(s):  
Primary Production ◽  
Riparian Zone ◽  
Cynodon Dactylon ◽  
Net Primary Production ◽  
Three Gorges ◽  
Relative Contribution

scholarly journals Net Primary Production Predicted by the Proportion of C:N:P Stoichiometric Ratio in the Leaf-Stem and Root of Cynodon Dactylon (Linn.) in the Riparian Zone of the Three Gorges Reservoir

Water ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 3279
Author(s):  
Dan Liu ◽  
Liping He ◽  
Zhiguo Yu ◽  
Zhengxue Liu ◽  
Junjie Lin
Keyword(s):  
Primary Production ◽  
Three Gorges Reservoir ◽  
Riparian Zone ◽  
Cynodon Dactylon ◽  
Net Primary Production ◽  
Stoichiometric Ratio ◽  
Three Gorges ◽  
P Content ◽  
C:P Ratio ◽  
Relationship Of

Net primary production (NPP) is closely related to the proportion of carbon (C), nitrogen (N) and phosphorus (P) in the leaf-stem and root of perennial herbs. However, the relationship of NPP with the C:N:P stoichiometric ratio in above- and below-ground plant tissues remains unknown under the periodic flooding stresses in the riparian zone ecosystem. In this study, the leaf-stem and root C, N, P content and biomass of Cynodon dactylon (Linn.) Pers. (C. dactylon) were investigated at the riparian zone altitudes of 145–155, 155–165, and 165–175 m above sea level (masl) of in a Three Gorges Reservoir (TGR) tributary–Pengxi River. The results showed that the NPP and biomass of C. dactylon had a similar decreasing trend with a riparian zone altitudes decrease. The root of C. dactylon showed relatively lower N and P content, but much higher N and P use efficiency with higher C:N and C:P ratio than that of a leaf-stem under N limitation conditions. NPP was positively correlated to C:N in the stem-leaf to root ratio (C:Nstem-leaf/root) and C:P ratio in the root (C:Proot ratio). Hydrological and C:N:P stoichiometric variables could predict 68% of the NPP variance, and thus could be regarded as the main predictor of NPP in the riparian zone of the TGR.

Early vegetation recovery and element cycles on a clear-cut watershed in western Oregon

1985 ◽  
Vol 15 (2) ◽  
pp. 400-409 ◽  
Author(s):  
Henry L. Gholz ◽  
Glenn M. Hawk ◽  
Alsie Campbell ◽  
Kermit Cromack Jr. ◽  
Alfred T. Brown
Keyword(s):  
Primary Production ◽  
Aboveground Biomass ◽  
Riparian Zone ◽  
Net Primary Production ◽  
Nutrient Loss ◽  
Litter Fall ◽  
Aboveground Net Primary Production ◽  
Clear Cut ◽  
Clear Cutting ◽  
Woody Shrubs

Aboveground biomass and leaf area, net primary production, and nutrient cycling through vegetation were studied for 3 years after clear-cutting (stems only) of a 10.24-ha watershed in the Oregon Cascade Mountains. The riparian zone and four main habitats were analyzed separately. In 3 years, aboveground net primary production increased from 5 to 112 g•m−2•year−1 in the ridgetop habitat; midsummer aboveground biomass increased from 8 to 196 g/m2 in the riparian zone and from 198 to 327 g/m2 on the ridgetop. Other values were intermediate to these. Litter fall of species with perennial aboveground parts averaged 20–27% of standing biomass. Native annuals, especially Araliacalifornica Wats., dominated the riparian zone. Seneciosylvaticus L., an introduced species, dominated most of the rest of the watershed, except for the ridgetop habitat, which was dominated by residual woody shrubs. Uptake of N exceeded losses in streamflow the 1st year and was six times greater in the 2nd; uptake of P and K in that year was 2.5 and 3 times greater than losses. In the 3rd year, total uptake of K (2.5 g•m−2•year−1) equaled the preclear-cutting level, and uptake of N (1.3 g•m−2•year−1) and P (0.3 g•m−2•year−1) was about half that level. No correlation was found between plant uptake and nutrient loss in streamflow. Uptake of all elements exceeded return through leaching and litter fall by 16%, except that of Mg, which exceeded return by 44%. Because of early dominance by species with annuals, the proportion of elements redistributed internally by vegetation was generally low. The amount of nutrients in flux through vegetation, atmosphere, and stream was small in comparison to the amount lost in the removal of tree stems.

scholarly journals Quantifying and mapping the human appropriation of net primary production in earth's terrestrial ecosystems

2007 ◽  
Vol 104 (31) ◽  
pp. 12942-12947 ◽  
Author(s):  
H. Haberl ◽  
K. H. Erb ◽  
F. Krausmann ◽  
V. Gaube ◽  
A. Bondeau ◽  
...  
Keyword(s):  
Primary Production ◽  
Net Primary Production ◽  
Terrestrial Ecosystems
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