Soil nitrogen (N) availability is a major constraint for plant growth and consequently impacts soil carbon (C) sequestration following afforestation. The transformation of soil organic N to plant available form is predominantly catalyzed by N-hydrolyzing enzymes. Yet how N-hydrolyzing enzymes affect N availability for soil C sequestration under afforestation remains unclear. Here, we examined N-hydrolyzing enzyme activities, N masses (N contents in equivalent soil mass) and the δ15N values of total N (TN) pool and stable N pool (SN, NaOCl–resistant) in soil aggregates following 30 years of afforestation in subtropical China. The relationships of soil N mass and supply via enzymes with those of C were also developed. Afforestation increased TN masses and N-hydrolyzing enzyme activities, but declined the percentages of SN in TN and the δ15N values in soil aggregates. Soil TN mass was positively correlated with soil organic C mass in aggregates across land use types. Similarly, soil enzymes for N acquisition scaled isometrically with C acquisition with a slope of ∼1.0. Our results indicate that N constraint for soil C sequestration can be alleviated by increasing soil N-hydrolyzing enzyme activities combined with reducing SN:TN ratios and homeostatic ecoenzymatic C:N ratios following afforestation, which lead to tight coupling of soil N and C cycling.
Soil Biology and Biochemistry – Elsevier
Published: Aug 1, 2018
It’s your single place to instantly
discover and read the research
that matters to you.
Enjoy affordable access to
over 18 million articles from more than
15,000 peer-reviewed journals.
All for just $49/month
Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly
Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.
Get unlimited, online access to over 18 million full-text articles from more than 15,000 scientific journals.
Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.
All the latest content is available, no embargo periods.
“Hi guys, I cannot tell you how much I love this resource. Incredible. I really believe you've hit the nail on the head with this site in regards to solving the research-purchase issue.”Daniel C.
“Whoa! It’s like Spotify but for academic articles.”@Phil_Robichaud
“I must say, @deepdyve is a fabulous solution to the independent researcher's problem of #access to #information.”@deepthiw
“My last article couldn't be possible without the platform @deepdyve that makes journal papers cheaper.”@JoseServera