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4 results for “leaf enzyme”
Data from: Different dynamics and controls of enzyme activities of leaf and root litter during decomposition
<p>Litter enzyme dynamics are strongly shaped by litter, soil, and microbial attributes during decomposition, however, enzyme dynamics of leaf and root litter remains unresolved due to contrasting differences in rates and controls on leaf and root litter decomposition.</p> <p>Herein, we conducted a 784-day field experiment to evaluate the relative importance of litter, alkaline soil, and microbial attributes to enzyme activities and their C:N:P stoichiometry of leaf and root litter during decomposition under subtropical land use change of China.</p> <p>We found that only the C- and N-acquiring enzyme activities of shrub leaves were greater than those of wood and crop, and there was no significant difference in P-acquiring enzyme activity among the three species of leaves. Both the C- and P-acquiring enzyme activities of crop roots were significantly lower than those of afforested lands (i.e., woodland and shrubland). The N-acquiring activities of wood roots were significantly lower than those of shrub and crop. At the temporal dynamics, the C-, N-, and P-acquiring enzyme activities of the leaves decreased with mass loss, which was affected by the shift in litter nutrients (e.g., N and P) and soil moisture during decomposition. In contrast, the three enzyme activities of roots increased with mass loss, largely due to the increase in microbial biomass of bacteria regulated by litter stoichiometry. The enzymatic C:nutrient (N and P) ratios declined with mass loss, but the enzymatic P:N ratios remained relatively constant with mass loss during the leaf litter decomposition. Whereas, both of the enzymatic C:nutrient ratios and enzymatic P:N ratios decreased with mass during the root litter decomposition. Our results showed that the enzymatic C:N:P stoichiometry of decaying leaves and roots was predominantly predicted by microbial biomass and bacterial biomass, respectively.</p> <p>Overall, we outlined the pattern of contrasting contributions of litter, soil, and microbial attributes to enzyme dynamics during decomposition, which provided a framework for better understanding litter C, N, and P dynamics in relation to microbial resource allocation strategy during decomposition.</p>
Leaf enzyme plays a more important role in leaf nitrogen resorption efficiency than soil properties along an elevation gradient
<p>1. Nitrogen (N) resorption is a strategy for plant N conservation through which plants withdraw N from senescing leaves prior to litterfall and its underlying mechanisms are important for better understanding of N cycling. However, most current studies focused on the impacts of soil and leaf nutrients on leaf N resorption efficiency (NRE), and plant physiological regulation that is species-dependent is still unclear.</p> <p>2. Here, we conducted a field experiment to investigate the variations of leaf NRE along an altitudinal gradient in a temperate forest of Northeastern China.</p> <p>3. Results showed that leaf NRE of Q. mongolica and F. mandshurica increased with altitude, while leaf NRE of T. amurensis, A. mono and A. pseudosieboldianum exhibited an opposite trend, although the relationships were not significant for F. mandshurica and A. mono. The inconsistent responses of leaf NRE of different species to increasing altitude were primarily due to the effect of leaf Glutamate dehydrogenase (GDH), an enzyme responsible for N translocation. Leaf GDH activity in senescing leaves explained the variation of NRE more than soil and climate factors did, suggesting that different plant species had different physiological regulation strategies for their N conservation under similar environment.</p> <p>4. Synthesis. Our study highlights the role of leaf enzyme as a pivotal regulator of leaf NRE and helps us better understand and predict N cycling under climate change in forest ecosystems.</p>
Leaf enzyme plays a more important role in leaf nitrogen resorption efficiency than soil properties along an elevation gradient
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Data from: Different dynamics and controls of enzyme activities of leaf and root litter during decomposition
Open the record for dataset details and reuse information.
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