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litter decomposition and nutrient release for two tropical N-fixing species in Rio de Janeiro,Brazil

Journal of Forestry Research 2022年第2期33卷 487-496页

作者： David Pessanha Siqueira Giovanna Campos Mamede Weiss de Carvalho JoséGabriel de Souza Silva Marcos Vinicius Winckler Caldeira Deborah Guerra Barroso Laboratório de Fitotecnia Universidade Estadual do Norte Fluminense Darcy RibeiroAvenida Alberto Lamego2000Campos dos GoytacazesRio de JaneiroBrazil Departamento de Ciências Florestais e da Madeira Universidade Federal do Espírito SantoAvenida Governador Lindenberg316Jerônimo MonteiroEspírito SantoBrazil Department of Geosciences and Natural Resources Management University of CopenhagenRolighedsvej 23Frederisksberg CDenmark

litter production and decomposition are critical to forest productivity,nutrient cycling,and carbon seques-tration in tropical woody ***,nutrient release and leaf litter stoichiometry in tropical legume tree plantations over the long term after outplanting are poorly understood or even *** improving our under-standing of the pattern of changes in the decomposition of N-fixing leaf litters and their possible impact on carbon stor-age,we measured litter production,mass loss and nutrient release for 240 d during litter decomposition for two tropical legume tree species(Plathymenia reticulata and Hymenaea courbaril),in Rio de Janeiro,*** production for *** was 5.689 kg ha^(−1) a^(−1) and 3.231 kg ha^(−1) a^(−1) for *** patterns of mass loss rates were similar;however,nutrient release was greater for ***,while *** showed immobilization of nutrients,especially for N,which increased by almost 20%in the early phase of decomposition followed by gradual *** from the N-fixing species did differ in nutrient chemistries over time,which was not surprising given that initial nutrient concentrations varied broadly,except for C and *** of the nutrient concentrations increased as the remaining litter mass decreased in both species,except for C and *** C:N and N:P ratios differed between the species,but N:P did not correlate to mass *** species had N-rich leaves,but *** decomposition was very likely P-limited,while *** seemed to be co-limited by N and *** results showed different patterns in nutrient release and the stoichi-ometry involved in the decomposition dynamics of the two tropical N-fixing species,even though they have similar litter decay *** species,but especially ***,may help re-establish nutrient cycling in disturbed ecosystems.

关键词： Nutrient dynamics Legume species litter chemistry Ecological stoichiometry Tropical forest

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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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A comparison of decomposition dynamics among green tree leaves,partially decomposed tree leaf litter and their mixture in a warm temperate forest ecosystem

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Journal of Forestry Research 2016年第5期27卷 1037-1045页

作者： Juan Wang Yeming You Zuoxin Tang Xiaolu Sun Osbert Jianxin Sun College of Forest Science Beijing Forestry University School of Biological Science and Technology Baotou Teachers’ College College of Forestry Guangxi University

Decomposition dynamics were compared among green tree leaves, partially decomposed tree leaf litter （i.e., decayed tree leaf litter on forest floor） and a mixture of the two in a warm temperate forest ecosystem in central China to test the influence of litter chemical quality on the degree of decomposition. The study was conducted in situ at two contrasting forest sites, an oak forest dominated by Quercus aliena var. acuteserrata Maxim., and a mixed pine and oak forest dominated by Pinus armandii Franch. and Q. aliena var. acuteserrata. We found marked differences in the rate of decomposition among litter types at both forest sites; the litter decom- position constant, k, was about 39 % greater at the oak forest site and more than 70 % greater at the pine-oak forest site, for green leaves than for partially decomposed leaf litter. The decomposition dynamics and temporal changes in litter chemistry of the three litter types also greatly differed between the two forest sites. At both forest sites, the higher rate of decomposition for the green leaves was associated with a and lower carbon to N ratio higher nitrogen （N） content （C/N） and acid-unhydrolyz- able residue to N ratio （AUR/N）. We did not find any non- additive effects when mixing green leaves and partially decomposed leaf litter. Our findings support the con- tention that litter chemical quality is one of the most important determinants of litter decomposition in forest ecosystems at the local or regional scale, but the effect of litter chemical quality on decomposition differs between the contrasting forest types and may vary with the stage of decomposition.

关键词： Carbon cycling litter chemistry litterdecay litter quality Recalcitrance

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Species and genetic diversity affect leaf litter decomposition in subtropical broadleaved forest in southern China

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Journal of Plant Ecology 2017年第1期10卷 232-241页

作者： Shanshan Li Yuewei Tong Zhengwen Wang Institute of Applied Ecology Chinese Academy of SciencesNo.72 Wenhua RdShenhe DistrictShenyang 110016China University of Chinese Academy of Sciences 19A Yuquan RdShijingshan DistrictBeijing 100049China

Aims litter decomposition is a fundamental process within ecosystem functioning,and it is largely dependent on the biodiversity of *** explored the effects of species diversity and genetic diversity of litter on the litter decomposition *** We used laboratory microcosms to determine whether species diversity and genetic diversity and their interaction affect leaf litter *** set up 8 treatments containing 1,2,4 diversity levels of four broad-leaf species(Alniphyllum fortunei,Idesia polycarpa,Cinnamomum camphora and Daphniphyllum oldhamii)both in species and genetic *** 246 microcosms containing same amount of soil and litter of prescribed diversity treatment were stored in the dark at 25℃for 12 *** Findings The effect of litter species diversity on litter decomposition was largely dependent on species composition of the litter mixture in terms of species ***,the decomposition rate increased linearly with the richness of seed family when the species identity was ***,no interactive effect of species diversity and genetic diversity on mass loss was *** litter decomposition rate was found to be unrelated to the initial carbon(C),whereas it was negatively correlated with the initial total nitrogen(N)and N:P ***,the regression curves of the litter decomposition rate against the total P and C:N ratio displayed quadratic parabolas opening upward and downward,*** study demonstrated how species and/or genetic diversity and the stoichiometry of litter per se affect litter *** studies should be performed in the long term to ascertain how such effects operate and how they change during the decomposition process,particularly in response to varying composition and diversity of standing plants in the environments.

关键词： C:N litter chemistry mass loss rate microcosm N:P seed family

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