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The amelioration of degraded larch(Larix olgensis)soil depends on the proportion of Aralia elata litter in *** agroforestry systems

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Journal of Forestry Research 2023年第4期34卷 1065-1076页

作者： Pingzhen Gao Jiaojun Zhu Qiaoling Yan Kai Yang Jinxin Zhang Qingyuan Forest CERN National Observation and Research StationShenyang 110016Liaoning ProvinceChina CAS Key Laboratory of Forest Ecology and Management Institute of Applied EcologyShenyang 110016China University of Chinese Academy of Sciences Beijing 100049China

Research has indicated that introducing Aralia elata into larch plantations forms an agroforestry system which could provide economic benefi ts for local farmers and improve degraded ***,the impact of litter mixtures on soil chemical and microbial properties in this agroforestry system are unclear,which limits effi cient management of the agroforestry system.A 365-d incubation experiment examined the eff ect of litter mixtures of diff erent proportions of larch(L)and ***(A)on soil chemical and microbial *** results show that levels of mineral N,available P,microbial biomass carbon and nitrogen,cumulative C mineralization,and activities of hydrolases and oxidases increased with an increase of *** in the litter *** of total soil carbon,nitrogen,and phosphorous did not change(except for total nitrogen).Compared with larch litter alone,levels of mineral N,available P,microbial biomass carbon and nitrogen,cumulative C mineralization,and the activities of hydrolases and oxidases increased by 7.6–433.5%.Most chemical and microbial properties were positively correlated with mixed litter proportions and the initial levels of N,P,K,Ca,Mg,Mn,Zn and Cu in the litter,while negatively correlated with the initial concentrations of C,Fe and lignin,C/N and lignin/N *** results indicate that *** litter can improve degraded larch soil and the degree depends on the proportion of *** litter in the litter mixtures.

关键词： Larch-based agroforestry incubation experiment Litter mixtures Litter quality Soil properties

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Impacts of soil properties on phosphorus adsorption and fractions in purple soils

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Journal of Mountain Science 2017年第12期14卷 2420-2431页

作者： XIAO Yi TANG Jia-liang WANG Ming-kuang ZHAI Long-bo ZHANG Xi-feng Key Laboratory of Mountain Environment Evolution and Regulation Institute of Mountain Hazards and EnvironmentChinese Academy of Sciences Department of Agricultural Chemistry National Taiwan University

Information on phosphorus(P) adsorption and its impacts on the redistribution of the P fraction in soil profiles are important for environmental management under intensive agricultural *** clarify the dominant factors influencing soil phosphorus adsorption in an Entisol(locally known as purple soil), P adsorption experiments were conducted in Sichuan Basin of southwestern China for cropland and woodland soils with acidic, neutral and calcareous origins throughout their profile. After various doses of P were added during incubation experiments, soil P fractions were also analyzed. The results showed that there were no significant differences in Fe-oxides and P adsorption along the vertical gradients. Agricultural practices and lower p H conditions reduced the P adsorption capacity of purple soils throughout the soil profiles. For acidic and neutral purple soil profiles, the P adsorption capability was mainly influenced by Fe-oxides and soil texture. Ca-bound P and Fe-Al-bound P represented the majority of the total inorganic P of calcareous *** was a saturation of adsorption capacity by sesquioxide and a high risk of dissoluble reactive P(NH_4 Cl-P) being released out of the soil profile in acidic and neutral purple soils after the greatest P addition, indicated by the higher proportions of NH_4 Cl-P(over 40%) and decreasing Fe-Al-P fraction.P fractions migrated with greater difficulty in calcareous purple soil profiles as Ca-P fraction peaked over 65% when adding a P dose at or greater than 80 g P kg^(-1), indicating the high potential of P *** X-Ray Diffraction analysis also verified the formation of brushite. Adaptive management practices should be designed to alleviate P losses for acidic and neutral purple soils.

关键词： Agroecology Soil parent material Feoxides Phosphorus adsorption incubation experiment Phosphorus fraction

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Short-Term and Long-Term Effects of Natural and Artificial Carbonaceous Substrates on Greenhouse Gas Fluxes

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Journal of Renewable Materials 2022年第7期10卷 1773-1786页

作者： Jürgen Kern Judy Libra Christian Ammon York Neubauer Wenceslau Teixeira Leibniz Institute for Agricultural Engineering and Bioeconomy e.V.(ATB) Potsdam14469Germany TCKON Engineering Services Dr.-Ing.York Neubauer Berlin13088Germany Embrapa Soils Rio de Janeiro24600-000Brazil

The emissions of two greenhouse gases(GHG),carbon dioxide(CO_(2))and nitrous oxide(N2O),from six substrates with different carbonaceous content were compared in short and long-term incubation *** natural soils and three artificial chars were mixed with carbon(C)poor soil(Cambisol)to simulate real conditions after application of char to *** natural soils were a Cambisol,an Anthrosol and a Histosol with C contents of 1.3%,4.4%and 13.2%,*** three chars produced through thermal conversion of wood chips by hydrothermal carbonisation(HTC),fluidized bed gasification and pyrolysis had C contents of 56.9%,75.4%and 79.9%,*** rates of CO_(2)and N2O from the rewetted substrates were measured by gas chromatography over a short time of 72 h and over a long period of nearly two *** short-term CO_(2)emissions from the natural soils showed a clear relationship to their C *** emission rate for the Histosol/Cambisol mixture was three times higher than that for the pure Cambisol,77.1 vs.23.5 mg CO_(2)-C kg^(-1)organic matter(OM)per *** C emission rates for the char/Cambisol mixtures were much lower,ranging between 3.0 and 9.1 mg CO_(2)-C kg OM^(-1)h^(-1),and did not correspond to their total C *** between the two incubation lengths showed that the long-term CO_(2)emission rates were generally one order of magnitude lower than the short-term *** final emission rates for natural substrates over a period of two years were still twice those for artificial char substrates,between 2.2–3.5 mg CO_(2)-C kg OM^(-1)h^(-1)and 1.3–1.8 mg CO_(2)-C kg OM^(-1)h^(-1),*** the contents of total nitrogen(Ntot)and extractable nitrogen(Nmin)were considerable in the chars under study,enhanced N2O release was not observed in the incubation ***,N2O emission rates in the three mixtures of chars and Cambisol were lower by one to two orders of magnitude compared to the pure Cambisol in

关键词： Biochar HTC char incubation experiment GHG carbon stability

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