Journal
JOURNAL OF ARID ENVIRONMENTS
Volume 197, Issue -, Pages -Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jaridenv.2021.104677
Keywords
Phosphorus addition; Litter decomposition; Nutrient release; Extracellular enzymes; Precipitation
Categories
Funding
- National Natural Science Foundation of China [41571048]
- Key National Research and Development program of China [2016YFC0500502]
- State Key Basic Research and Development Plan of China [2014CB138803]
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The study found that phosphorus addition can promote the decomposition of Stipa grandis and mixed litter, and phosphorus addition also promotes nitrogen and phosphorus immobilization, but leucine aminopeptidase production is also promoted under high phosphorus concentrations. The results show that Inner Mongolia's grasslands have significant decomposition and nutrient release processes under precipitation conditions.
The productivity of terrestrial ecosystems is limited by soil fertility, such assoil phosphorus (P). The decomposition of litter is the main process that affects nutrient cycling. To understand the characteristics of litter decomposition and nutrient release under P addition, we conducted a 2-year litter bag experiment at P addition rates (0-12.5 g P m(-2) yr(-1)). All litter decomposed faster during the second growing season due to highly concentrated precipitation, and Stipa grandis litter decomposed faster (1.02-1.63 times) than Leymus chinensis under P treatments. The decomposition of L. chinensis and mixed litter was more thoroughly at 1 g P m(-2) yr(-1), while S. grandis decomposed more under 5 g P m(-2) yr(-1). P addition promoted nitrogen (N) and P immobilization and all litter reached its maximum at 12.5 g P m(-2) yr(-1). Phosphorus addition increased beta-glucosidase production at 5 g P m(-2) yr(-1), but leucine aminopeptidase production was promoted at high P. The ratio of leucine aminopeptidase to phosphatase increased over time, indicating the N deficiency and P saturation during late stages of decomposition. Our results show that Inner Mongolia's grasslands was limited by P availability and that precipitation was important in the region's decomposition processes.
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