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Effects of long-term partial substitution of inorganic fertilizer with pig manure and/or straw on nitrogen fractions and microbiological properties in greenhouse vegetable soils

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Journal of Integrative Agriculture 2024年第6期23卷 2083-2098页

作者： Shuo Yuan Ruonan Li Yinjie Zhang Hao'an Luan Jiwei Tang Liying Wang Hongjie Ji Shaowen Huang State Key Laboratory of Efficient Utilization of Arid and Semi-arid Arable Land in northern China/Institute of Agricultural Resources and Regional Planning Chinese Academy of Agricultural SciencesBeijing 100081China Institute of Agricultural Resources and Environment Hebei Academy of Agriculture and Forestry SciencesShijiazhuang 050051China College of Resources and Environment Henan Agricultural UniversityZhengzhou 450002China College of Forestry Hebei Agricultural UniversityBaoding 071000China

Partial substitution of inorganic fertilizers with organic amendments is an important agricultural management *** 11-year field experiment(22 cropping periods)was carried out to analyze the impacts of different partial substitution treatments on crop yields and the transformation of nitrogen fractions in greenhouse vegetable *** treatments with equal n,P_(2)O_(5),and K_(2)O inputs were selected,including complete inorganic fertilizer n(Cn),50%inorganic fertilizer n plus 50%pig manure n(CPn),50%inorganic fertilizer n plus 25%pig manure n and 25%corn straw n(CPSn),and 50%inorganic fertilizer n plus 50%corn straw n(CSn).Organic substitution treatments tended to increase crop yields since the 6th cropping period compared to the Cn *** the 8th to the 22nd cropping periods,the highest yields were observed in the CPSn treatment where yields were 7.5-11.1%greater than in Cn *** 11-year fertilization,compared to Cn,organic substitution treatments significantly increased the concentrations of nO_(3)^(-)-n,nH_(4)^(+)-n,acid hydrolysis ammonium-n(AHAn),amino acid-n(AAn),amino sugar-n(ASn),and acid hydrolysis unknown-n(AHUn)in soil by 45.0-69.4,32.8-58.1,49.3-66.6,62.0-69.5,34.5-100.3,and 109.2-172.9%,*** analysis indicated that soil C/n and OC concentration significantly affected the distribution of n *** highest concentrations of nO_(3)^(-)-n,AHAn,AAn,AHUn were found in the CPSn *** substitution treatments increased the activities ofβ-glucosidase,β-cellobiosidase,n-acetyl-glucosamidase,L-aminopeptidase,and phosphatase in the *** substitution treatments reduced vector length and increased vector angle,indicating alleviation of constraints of C and n on soil *** substitution treatments increased the total concentrations of phospholipid fatty acids(PLFAs)in the soil by 109.9-205.3%,and increased the relative abundance of G^(+)bacteria and fungi taxa,but decreased the relat

关键词： organic substitution management greenhouse vegetable production n fractions microbial community composition extracellular enzyme activity enzyme stoichiometry coefficients

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Species divergence in seedling leaf traits and tree growth response to nitrogen and phosphorus additions in an evergreen broadleaved forest of subtropical China

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Journal of Forestry Research 2023年第1期34卷 137-150页

作者： Xuemin Ye Wensheng Bu Xiaofei Hu Bin Liu Kuan Liang Fusheng Chen Key Laboratory of national Forestry and Grassland Administration On Forest Ecosystem Protection and Restoration of Poyang Lake Watershed Jiangxi Agricultural UniversityNanchang 330045People’s Republic of China Jiangxi Provincial Key Laboratory of Silviculture College of ForestryJiangxi Agricultural UniversityNanchang 330045People’s Republic of China School of Management Nanchang UniversityNanchang 330045People’s Republic of China

Tree competitiveness generally depends on trait plasticity in response to environmental *** effects of nitrogen(n)and phosphorus(P)on leaf trait variability by species is poorly understood,especially in China’s subtropical *** study examined the seedling leaf traits and net primary productivity of all trees>5 cm DBH of two dominant species,Schima superba and Castanopsis carlesii,in an evergreen broadleaved forest fertilized with nitrogen(+n),phosphorus(+P),and nitrogen plus phosphorus(n+P).The effect of n on seedling leaf traits was stronger than P,while fertilization in general was species *** mass per unit area decreased with n for *** seedlings but not for *** n,P,and n/P ratios changed with n addition for both *** four n fractions of carboxylation,bioenergetics,cell wall,and other n metabolites in *** leaves responded significantly to fertilization,while only the cell wall in *** a leaves *** leaf functional traits,including light-saturated photosynthetic rates,water,n,and P use efficiencies,chlorophyll and non structural carbohydrate contents increased with n addition in *** a and by P addition in *** closure at the stand-level increased due to *** biomass and relative growth rate of *** a was not affected by any treatments,while both for *** significantly decreased with n+P ***,nutrient limitation may vary at a small scale among species in a subtropical forest based on their responses of seedling traits and net primary productivity to *** traits are not correlated with the net primary productivity of larger trees except for n fractions,because low light conditions induced by fertilization reduces the proportion of n allocated to photosynthesis in *** addition,acclimation differences of tree species may increase the uncertainty of community succession.

关键词： Ecophysiology Fertilization acclimation n fractions nutrient limitation Photosynthesis Relative growth rate

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