The transformation of organic P(Po) from organic manures in two types of soils (ultisol and entisol) and the influences of external addition of organic substance or inorganic P(Pi) on Po under the condition of the 60%...The transformation of organic P(Po) from organic manures in two types of soils (ultisol and entisol) and the influences of external addition of organic substance or inorganic P(Pi) on Po under the condition of the 60% maximum water capacity were investigated.The results obtained from Po fractionation experiments indicated that all the Po fractions except for the highly resistant Po fraction decreased during incubation.Application of pig feces and cow feces could largely increase each fraction of Po in the soils.Immediately after application of organic manure into the soils a large part of labile and moderately labile Po from organic manure was transferred into moderately resistant Po,which might be due to the fact that Ca-or Mg-inositol P was precipitated into Fe-inositol P.However,the availability of Po from organic manure in the soils would increase again after incubation because of the transformation of moderately labile and resistant Po fractions into labile Po fractions.Addition of cellulose or Pi into the soils showed a good effect on increasing all the Po fractions except for the highly resistant Po,and this effect was much more pronounced when cellulose was applied in combination with Pi.Therefore,in view of the effect of organic manure on improving P nutrition to plant,attention should be paid to both the Po and the organic substances from organic manure,It is suggested that application of Pi fertilizer combined with organic manure may be referred to as an effective means of protecting Pi from chemical fixation in soil.展开更多
为了在东方 Horqin 砂土，中国， P 部分和 phosphomonoesterase 活动在土壤磷(P) 转变上估计无树平原造林的效果，在一个无树平原和邻近的 30-year-oldMongolian 松下面在二土层(0-5 厘米和 5-20 厘米) 被检验(Pinus sylvestris L。va...为了在东方 Horqin 砂土，中国， P 部分和 phosphomonoesterase 活动在土壤磷(P) 转变上估计无树平原造林的效果，在一个无树平原和邻近的 30-year-oldMongolian 松下面在二土层(0-5 厘米和 5-20 厘米) 被检验(Pinus sylvestris L。var。蒙古人集成通信适配器 Litv )P 缺乏的 semi-aridsandy 土壤上的种植园。除了在种植园下面的易变的器官的 P 与土壤深度是不变的之外，结果证明所有土壤 P 部分和 phosphomonoesterase 活动在两个地点与土壤深度减少了。与无树平原相对照，在蒙古的松种植园下面的土壤举办了 lowerphosphomonoesterase 活动和所有 P 部分的集中(与高山的一个例外) ，在全部的 P 的器官的 P 和帽子的更低的比例，和易变的 P 的更高的比例，在全部的 P 的高山 andFe-P。这些结果建议 P 转变主要发生在表土，并且通过崽秋天再循环的 P 是最重要的来源种可得到的 P。Mongolianpine 造林提高了器官的 P 和帽子的简历可获得性，同时减少的土壤 P 水池，显示森林地板和 P 授精的那保护是必要的维持蒙古的松种植园的持续工作。展开更多
The aim of this study was to investigate the role of rhizosphere organic phosphorus(P) in soil P supply in semiarid forests and the effects of tree species on rihizosphere organic P. We examined organic P fractions in...The aim of this study was to investigate the role of rhizosphere organic phosphorus(P) in soil P supply in semiarid forests and the effects of tree species on rihizosphere organic P. We examined organic P fractions in rhizosphere and bulk soils of mono-specific Simon poplar(Populus simonii) and Mongolian pine(Pinus sylvestris var. mongolica) plantations in a semiarid sandy soil of Horqin Sandy Land in Northeast China. Total organic P(TPo) accounted for 76% of total P across the two stands. The concentration of organic P(Po) fractions decreased in the order of Na OH-Po>Res-Po>HCl-Po>Na HCO3-Po in both plantations. The concentration of Na HCO3-Po was 38% and 43% lower in rhizosphere soil than in bulk soil in Simon poplar and Mongolian pine plantations, respectively. In contrast, total P, TPo and Na OH-Po significantly accumulated in rhizosphere soil in Simon poplar plantations, but no change in Mongolian pine plantations. Soil recalcitrant organic P fractions were positively correlated with soil organic carbon. The results suggest that rhizosphere labile organic P was an important source of plant-available P in this semiarid region, but the dynamic of rhizosphere recalcitrant organic P fractions varied with tree species and was correlated to organic carbon dynamics.展开更多
In this article,we study the following fractional(p,q)-Laplacian equations involving the critical Sobolev exponent:(Pμ,λ){(−Δ)s 1 p u+(−Δ)s 2 q u=μ|u|q−2 u+λ|u|p−2 u+|u|p∗s 1−2 u,u=0,inΩ,in R N∖Ω,whereΩ⊂R N i...In this article,we study the following fractional(p,q)-Laplacian equations involving the critical Sobolev exponent:(Pμ,λ){(−Δ)s 1 p u+(−Δ)s 2 q u=μ|u|q−2 u+λ|u|p−2 u+|u|p∗s 1−2 u,u=0,inΩ,in R N∖Ω,whereΩ⊂R N is a smooth and bounded domain,λ,μ>0,0<s 2<s 1<1,1<q<p<Ns 1.We establish the existence of a non-negative nontrivial weak solution to(Pμ,λ)by using the Mountain Pass Theorem.The lack of compactness associated with problems involving critical Sobolev exponents is overcome by working with certain asymptotic estimates for minimizers.展开更多
In this article, we study the existence of multiple solutions for the following system driven by a nonlocal integro-differential operator with zero Dirichlet boundary conditions{(-?)_p^su = a(x)|u|^(q-2) u +2α/α + ...In this article, we study the existence of multiple solutions for the following system driven by a nonlocal integro-differential operator with zero Dirichlet boundary conditions{(-?)_p^su = a(x)|u|^(q-2) u +2α/α + βc(x)|u|^(α-2) u|v|~β, in ?,(-?)_p^sv = b(x)|v|^(q-2) v +2β/α + βc(x)|u|α|v|^(β-2) v, in ?,u = v = 0, in Rn\?,(0.1) where Ω is a smooth bounded domain in Rn, n > ps with s ∈(0,1) fixed, a(x), b(x), c(x) ≥ 0 and a(x),b(x),c(x) ∈L∞(Ω), 1 < q < p and α,β > 1 satisfy p<α + β<p*,p* =np/n-ps.By Nehari manifold and fibering maps with proper conditions, we obtain the multiplicity of solutions to problem(0.1).?????展开更多
Using a novel small-angle X-ray scattering (SAXS) method for determination of fractional and subfractional composition of lipoproteins (LPs), a significant elevation of total cholesterol-lipop- roteins (C-LP) and, esp...Using a novel small-angle X-ray scattering (SAXS) method for determination of fractional and subfractional composition of lipoproteins (LPs), a significant elevation of total cholesterol-lipop- roteins (C-LP) and, especially, total triglyceride- lipoproteins (TG-LP), was shown in this work. Among the LP fractions, poloxamer 407 was shown to significantly increase proatherogenic total C-LDL, TG-LDL and, especially, their precursors C-VLDL and TG-VLDL, while only exhibiting a moderate increase in the antiatherogenic C-HDL and TG-HDL fractions. With regard to the VLDL subfractions, significant elevations were observed in both subfractions studied;namely, C-VLDL1-2 and C-VLDL3-5. Similar chang- es were noted in the TG-VLDL1-2 and TG- VLDL3-5 subfractions. The C-IDL and TG-IDL subfractions were increased significantly (?20- to 30- fold), while the C-LDL1-3 subfraction was moderately (?3- to 5-fold) increased at 48 hrs and at day 4. In the moderately elevated (?2- to 4-fold) anti-atherogenic HDL fraction, the C-HDL2 subfraction was increased more significantly (?4- fold) compared to the C-HDL3 subfraction;how- ever, both C-HDL subfractions returned to base- line by day 4. The elevation in the TG-HDL2 subfraction was observed only at 24 hrs. Mouse models of hyperlipidemia and atherosclerosis are useful to evaluate the role of “individual” LPs, as well as their fractions and subfractions, in hyperlipidemia and the genesis of atherosclerosis.展开更多
In this paper,by using the coincidence degree theory,the existence of solutions for a coupled system of fractional p-Laplacian differential equations at resonance is studied.The result obtained in this paper extends s...In this paper,by using the coincidence degree theory,the existence of solutions for a coupled system of fractional p-Laplacian differential equations at resonance is studied.The result obtained in this paper extends some known results.An example is given to illustrate our result.展开更多
基金Natural Science Foundation of Xinjiang Uygur Autonomous Region(2021D01B35)Natural Science Foundation of colleges and universities in Xinjiang Uygur Autonomous Region(XJEDU2021Y048)。
基金Project supported by the National Natural Science Foundation of China.
文摘The transformation of organic P(Po) from organic manures in two types of soils (ultisol and entisol) and the influences of external addition of organic substance or inorganic P(Pi) on Po under the condition of the 60% maximum water capacity were investigated.The results obtained from Po fractionation experiments indicated that all the Po fractions except for the highly resistant Po fraction decreased during incubation.Application of pig feces and cow feces could largely increase each fraction of Po in the soils.Immediately after application of organic manure into the soils a large part of labile and moderately labile Po from organic manure was transferred into moderately resistant Po,which might be due to the fact that Ca-or Mg-inositol P was precipitated into Fe-inositol P.However,the availability of Po from organic manure in the soils would increase again after incubation because of the transformation of moderately labile and resistant Po fractions into labile Po fractions.Addition of cellulose or Pi into the soils showed a good effect on increasing all the Po fractions except for the highly resistant Po,and this effect was much more pronounced when cellulose was applied in combination with Pi.Therefore,in view of the effect of organic manure on improving P nutrition to plant,attention should be paid to both the Po and the organic substances from organic manure,It is suggested that application of Pi fertilizer combined with organic manure may be referred to as an effective means of protecting Pi from chemical fixation in soil.
基金This work was supported by Innovation Research Project of Chinese Academy of Sciences （KZCX3-SW-418）, National Natural Science Foundation of China （30471377） and sustentation project of the Institute of Applied Ecology of Chinese Academy of Sciences （SLYQY0409）.
文摘为了在东方 Horqin 砂土，中国， P 部分和 phosphomonoesterase 活动在土壤磷(P) 转变上估计无树平原造林的效果，在一个无树平原和邻近的 30-year-oldMongolian 松下面在二土层(0-5 厘米和 5-20 厘米) 被检验(Pinus sylvestris L。var。蒙古人集成通信适配器 Litv )P 缺乏的 semi-aridsandy 土壤上的种植园。除了在种植园下面的易变的器官的 P 与土壤深度是不变的之外，结果证明所有土壤 P 部分和 phosphomonoesterase 活动在两个地点与土壤深度减少了。与无树平原相对照，在蒙古的松种植园下面的土壤举办了 lowerphosphomonoesterase 活动和所有 P 部分的集中(与高山的一个例外) ，在全部的 P 的器官的 P 和帽子的更低的比例，和易变的 P 的更高的比例，在全部的 P 的高山 andFe-P。这些结果建议 P 转变主要发生在表土，并且通过崽秋天再循环的 P 是最重要的来源种可得到的 P。Mongolianpine 造林提高了器官的 P 和帽子的简历可获得性，同时减少的土壤 P 水池，显示森林地板和 P 授精的那保护是必要的维持蒙古的松种植园的持续工作。
基金funded by the National Natural Science Foundation of China (41373087, 30800887)the State Key Laboratory of Forest and Soil Ecology (LFSE2013-11)
文摘The aim of this study was to investigate the role of rhizosphere organic phosphorus(P) in soil P supply in semiarid forests and the effects of tree species on rihizosphere organic P. We examined organic P fractions in rhizosphere and bulk soils of mono-specific Simon poplar(Populus simonii) and Mongolian pine(Pinus sylvestris var. mongolica) plantations in a semiarid sandy soil of Horqin Sandy Land in Northeast China. Total organic P(TPo) accounted for 76% of total P across the two stands. The concentration of organic P(Po) fractions decreased in the order of Na OH-Po>Res-Po>HCl-Po>Na HCO3-Po in both plantations. The concentration of Na HCO3-Po was 38% and 43% lower in rhizosphere soil than in bulk soil in Simon poplar and Mongolian pine plantations, respectively. In contrast, total P, TPo and Na OH-Po significantly accumulated in rhizosphere soil in Simon poplar plantations, but no change in Mongolian pine plantations. Soil recalcitrant organic P fractions were positively correlated with soil organic carbon. The results suggest that rhizosphere labile organic P was an important source of plant-available P in this semiarid region, but the dynamic of rhizosphere recalcitrant organic P fractions varied with tree species and was correlated to organic carbon dynamics.
基金National Natural Science Foundation of China(11501252 and 11571176)。
文摘In this article,we study the following fractional(p,q)-Laplacian equations involving the critical Sobolev exponent:(Pμ,λ){(−Δ)s 1 p u+(−Δ)s 2 q u=μ|u|q−2 u+λ|u|p−2 u+|u|p∗s 1−2 u,u=0,inΩ,in R N∖Ω,whereΩ⊂R N is a smooth and bounded domain,λ,μ>0,0<s 2<s 1<1,1<q<p<Ns 1.We establish the existence of a non-negative nontrivial weak solution to(Pμ,λ)by using the Mountain Pass Theorem.The lack of compactness associated with problems involving critical Sobolev exponents is overcome by working with certain asymptotic estimates for minimizers.
基金supported by the National Natural Science Foundation of China(11761030)Hubei Provincial Natural Science Foundation of China(2017CFB352)+1 种基金Doctoral Science Research Foundation of Hubei University for Nationalities(MY2013B019)Youth Research Foundation of Hubei Institute for Nationalities(MY2017Q023)
文摘In this article, we study the existence of multiple solutions for the following system driven by a nonlocal integro-differential operator with zero Dirichlet boundary conditions{(-?)_p^su = a(x)|u|^(q-2) u +2α/α + βc(x)|u|^(α-2) u|v|~β, in ?,(-?)_p^sv = b(x)|v|^(q-2) v +2β/α + βc(x)|u|α|v|^(β-2) v, in ?,u = v = 0, in Rn\?,(0.1) where Ω is a smooth bounded domain in Rn, n > ps with s ∈(0,1) fixed, a(x), b(x), c(x) ≥ 0 and a(x),b(x),c(x) ∈L∞(Ω), 1 < q < p and α,β > 1 satisfy p<α + β<p*,p* =np/n-ps.By Nehari manifold and fibering maps with proper conditions, we obtain the multiplicity of solutions to problem(0.1).?????
文摘Using a novel small-angle X-ray scattering (SAXS) method for determination of fractional and subfractional composition of lipoproteins (LPs), a significant elevation of total cholesterol-lipop- roteins (C-LP) and, especially, total triglyceride- lipoproteins (TG-LP), was shown in this work. Among the LP fractions, poloxamer 407 was shown to significantly increase proatherogenic total C-LDL, TG-LDL and, especially, their precursors C-VLDL and TG-VLDL, while only exhibiting a moderate increase in the antiatherogenic C-HDL and TG-HDL fractions. With regard to the VLDL subfractions, significant elevations were observed in both subfractions studied;namely, C-VLDL1-2 and C-VLDL3-5. Similar chang- es were noted in the TG-VLDL1-2 and TG- VLDL3-5 subfractions. The C-IDL and TG-IDL subfractions were increased significantly (?20- to 30- fold), while the C-LDL1-3 subfraction was moderately (?3- to 5-fold) increased at 48 hrs and at day 4. In the moderately elevated (?2- to 4-fold) anti-atherogenic HDL fraction, the C-HDL2 subfraction was increased more significantly (?4- fold) compared to the C-HDL3 subfraction;how- ever, both C-HDL subfractions returned to base- line by day 4. The elevation in the TG-HDL2 subfraction was observed only at 24 hrs. Mouse models of hyperlipidemia and atherosclerosis are useful to evaluate the role of “individual” LPs, as well as their fractions and subfractions, in hyperlipidemia and the genesis of atherosclerosis.
基金The Key NSF(KJ2015A196)of Anhui Higher Educationthe Young Foundation(2015QN19)of Hefei Normal University
文摘In this paper,by using the coincidence degree theory,the existence of solutions for a coupled system of fractional p-Laplacian differential equations at resonance is studied.The result obtained in this paper extends some known results.An example is given to illustrate our result.
