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Impact of tree litter identity, litter diversity and habitat quality on litter decomposition rates in tropical moist evergreen forest

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Forest Ecosystems 2022年第2期9卷 247-256页

作者： Seyoum Getaneh Olivier Honnay Ellen Desie Kenny Helsen Lisa Couck Simon Shibru Bart Muys Division Forest Landscape and NatureKU LeuvenCelestijnenlaan 200E-2411BE-3001LeuvenBelgium Department of Biology College of Natural SciencesArba Minch UniversityP.O.Box 21Arba MinchEthiopia Department of Biology KU LeuvenKasteelpark Arenberg 31-2435BE-3001LeuvenBelgium

Background:Attempts to restore degraded highlands by tree planting are common in East ***,up till now,little attention has been given to effects of tree species choice on litter decomposition and nutrient ***:In this study,three indigenous and two exotic tree species were selected for a litter decomposition *** objective was to identify optimal tree species combinations and tree diversity levels for the restoration of degraded land via enhanced litter *** were installed in June 2019 into potential restoration sites(disturbed natural forest and forest plantation)and compared to intact natural *** tested tree leaf litters included five monospecific litters,ten mixtures of three species and one mixture of five *** green and rooibos tea were used for comparison.A total of 1,033 litters were retrieved for weight loss analysis after one,three,six,and twelve months of ***:The finding indicates a significant effect of both litter quality and litter diversity on litter *** nitrogen-fixing native tree Millettia ferruginea showed a comparable decomposition rate as the fast decom-posing green *** exotic conifer Cupressus lusitanica and the native recalcitrant Syzygium guineense have even a lower decomposition rate than the slowly decomposing rooibos tea.A significant correlation was observed be-tween litter mass loss and initial leaf litter chemical ***,we found positive non-additive ef-fects for litter mixtures including nutrient-rich and negative non-additive effects for litter mixtures including poor leaf litters ***:These findings suggest that both litter quality and litter diversity play an important role in decom-position processes and therefore in the restoration of degraded tropical moist evergreen forest.

关键词： Antagonistic effect Forest type Functional diversity litterbag litter mixture litter quality Non-additive effect Tea bag index

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Decomposition of Mongolian pine litter in the presence of understory species in semi-arid northeast China

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Journal of Forestry Research 2016年第2期27卷 329-337页

作者： Bing Mao Rong Mao Yalin Hu Yue Huang Dehui Zeng State Key Laboratory of Forest and Soil Ecology Institute of Applied EcologyChinese Academy of SciencesShenyang 110164China University of Chinese Academy of Sciences Beijing 100049China Daqinggou Ecological Station Institute of Applied EcologyChinese Academy of SciencesShenyang 110016China Northeast Institute of Geography and Agroecology Chinese Academy of SciencesChangchun 130012China

The effects of understory plant litter on domi- nant tree litter decomposition are not well documented especially in semi-arid forests. In this study, we used a microcosm experiment to examine the effects of two understory species （Artemisia scoparia and Setaria viridis） litter on the mass loss and N release of Mongolian pine （Pinus sylvestris var. mongolica） litter in Keerqin Sandy Lands, northeast China, and identified the influencing mechanism from the chemical quality of decomposing litter. Four litter combinations were set up： one monocul- ture of Mongolian pine and three mixtures of Mongolian pine and one or two understory species in equal mass proportions of each species. Total C, total N, lignin, cel- lulose and polyphenol concentrations, and mass loss of pine litter were analyzed at days 84 and 182 of *** chemistry of pine litter not only changed with the stages of decomposition, but was also strongly influenced by the presence of understory species during decomposition. Both understory species promoted mass loss of pine litter at 84 days, while only the simultaneous presence of two understory species promoted mass loss of pine litter at 182 days. Mass loss of pine litter was negatively correlated with initial ratios of C/N, lignin/N and polyphenol/N of litter combinations during the entire incubation period; at 182 days it was negatively correlated with polyphenol concentration and ratios of C/N and polyphenol/N of litter combinations at 84 days of incubation. Nitrogen release of pine litter was promoted in the presence of understory species. Nitrogen release at 84 days was negatively correlated with initial N concentration; at 182 days it was negatively correlated with initial polyphenol concentration of litter combinations and positively correlated with lignin concentration of litter com- binations at 84 days of incubation. Our results suggest that the presence ofunderstory species causes substantial changes in chemical components of pine litt

关键词： litter chemistry litter mixture Mass loss Nitrogen release Understory species

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Establishment of mixed plantations of Pinus sylvestris *** and Populus×xiaozhuanica may not be appropriate:evidence from litter decomposition

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Journal of Plant Ecology 2019年第5期12卷 857-870页

作者： Huan-Huan Song Tao Yan De-Hui Zeng CAS Key Laboratory of Forest Ecology and Management Institute of Applied EcologyChinese Academy of SciencesShenyang 110016China Daqinggou Ecological Station Institute of Applied EcologyChinese Academy of SciencesShenyang 110016China University of Chinese Academy of Sciences Beijing 100049China Sino-French Institute for Earth System Science College of Urban and Environmental SciencesPeking UniversityBeijing 100871China

Aims Mongolian pine(Pinus sylvestris ***)and Xiaozhuan poplar(Populus×xiaozhuanica)are two predominant afforestation tree species in the semi-arid sandy lands of northeast china,which are characterized by poor soil *** litter decomposition plays a critical role in regulating nutrient cycling in terrestrial *** of broadleaf litter to conifer litter is expected to improve litter decomposition and soil fertility,and thus ***,the effects on the decomposition of litter mixture of the above two tree species are not well ***,it is essential to assess the decomposition performance of litter mixture with the aim of improving forest nutrient management and the establishment of mixed *** forest manage-ment practice is critical for the sustainability of site productivity in plantation *** We conducted a field litterbag decomposition transplant experi-ment for single pine litter,single poplar litter and their mixture in a pine stand,a poplar stand and an adjacent grassland for 16 months in the Keerqin Sandy Lands,northeast *** Findings After 16 months of incubation,there remained significantly more litter mass of pine(73.8%)than of poplar(67.2%).the mass remaining was positively correlated with litter carbon(c):nitrogen(N),c:phosphorus(P)and lignin:N ratios,and negatively with litter N and P concentrations,which suggests that initial litter chemical properties were an important factor affecting litter ***,net N and P immobilizations were observed during *** indicates that litter decomposition in this area was N-limited as N was progressively immobilized,and then tended to induce P ***,we strongly recommend prohibiting litter harvesting by local residents to maintain soil fertility in this nutrient-poor *** results do not support the home-field advantage hypothesis,as illustrated by the fact that,in most cases,mass loss of

关键词： litter mass remaining nutrient immobilization litter mixture additive effect home-field advantage nutrient-poor area

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