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1.
The objectives of this work were to determine the potential mineralization of various organic pollutants that are likely found in compostable materials during composting, and to evaluate the participation of the microflora of the thermophilic and maturation composting phases in pollutant mineralization. Four composts were used: a biowaste compost (BioW), a municipal solid waste compost (MSW), a green waste compost (GW) and a co-compost of green waste and sludge (GW+S). In each composting plant, two samples were withdrawn: one in the thermophilic phase (fresh compost) and one in the maturation phase (mature compost) to have the microflora of thermophilic and maturation phases active, respectively. The mineralization of 5 organic pollutants, 3 polycyclic aromatic hydrocarbons (PAHs) (i.e., phenanthrene, fluoranthene and benzo(a)pyrene), 1 herbicide (dicamba) and 1 polychlorinated biphenyl (PCB, congener 52), was measured in a laboratory setting during incubations at 60 ℃ in fresh composts and at 28 ℃ in mature composts. All molecules were 14 C-labeled, which allowed the mineralization of the molecules to be measured by trapping of produced 14CO2 in NaOH. Their volatilization was also measured by trapping molecules on glass wool impregnated with paraffin oil. Mineralization of the organic molecules was only observed when the maturation microflora was present in the mature composts or when it was inoculated into the fresh compost. Phenanthrene mineralization of up to 60% in the fresh GW+S compost was the only exception. Mineralization of PAH decreased when the complexity of the PAH molecules increased. Mineralization of phenanthrene and fluoranthene reached 50%-70% in all mature composts. Benzo(a)pyrene was mineralized (30%) only in the MSW mature compost. Dicamba was moderately mineralized (30%-40%). Finally, no PCB mineralization was detected, but 20% of the PCB had volatilized after 12 d at 60 ℃. No clear difference was observed in the degrading capacity of the different composts, and the major difference was the larger mineralizing capacity of the maturation microflora compared with the thermophilic microflora.  相似文献   

2.
Aerobic static pile composting(Mechanical turning every 3 days) of pig manure was prepared at 8 m^3 windrow heaps .Sawdust was used as the bulking aagent to provide additional carbon and to increase the porosity of the substrate Two treatments at initial C/N ratios of 30 and 15,respectively,were designed in the study,Dissolved organic carbon(DOC),soluble NH4^ -N,C/N ratios in solid and aqueous phases,E4/E6 ratios,and seed germination index(GI) were determined to evaluate the maturity of the co-composts.Seed germination index,a biological parameter,was suggested as one of the most reliable maturity indicators for organic compost.The results showed that the treatment at the initial C/N ratio of 30 reached maturity after 49 days of composting ;however,the treatment at the initial C/N ration of 15 should require composting time of longer than 63 days to obtain maturation.Chemical multi-indicator evaluation was necessary,and the GI measurement was the recommended approach for maturity evaluation in the study.  相似文献   

3.
Composts are considered to be one of the best soil amendments. However, the effects of composts with added polymeric materials on soil physical,hydraulic, and micromorphological properties have not been widely discussed. Changes in soil physical properties influence the numerous services that soils provide. We studied the impacts of composts with the addition of three different polymers(F1–F3) produced from polyethylene and thermoplastic corn starch on the physical, hydraulic, and micromorphological properties of two soils, a Cambic Phaeozem and a Luvic Phaeozem. Applying composts with polymers had limited or no significant effect on soil bulk density and porosity, but increased the field water capacity by 18%–82% and 3%–6% and the plant-available water content by 15%–23% and 4%–17% for the Cambic Phaeozem and Luvic Phaeozem, respectively. The application of composts with polymers had a greater effect on the Cambic Phaeozem than on the Luvic Phaeozem. It was suggested that the use of modified composts led to changes in soil physical properties and micromorphological features and this effect was dependent on the compost application rate. Composts made with the addition of composite synthetic and natural material-derived polymers during composting were found to be a composite mixture that can be successfully used in agriculture.  相似文献   

4.
生物碳可以防止土壤活性有机质矿化吗？   总被引：2，自引：0，他引：2  
Biochar could help to stabilize soil organic(SOM) matter, thus sequestering carbon(C) into the soil. The aim of this work was to determine an easy method i) to estimate the effects of the addition of biochar and nutrients on the organic matter(SOM)mineralization in an artificial soil, proposed by the Organization for Economic Co-operation and Development(OECD), amended with glucose and ii) to measure the amount of labile organic matter(glucose) that can be sorbed and thus be partially protected in the same soil, amended or not amended with biochar. A factorial experiment was designed to check the effects of three single factors(biochar, nutrients, and glucose) and their interactions on whole SOM mineralization. Soil samples were inoculated with a microbial inoculum and preincubated to ensure that their biological activities were not limited by a small amount of microbial biomass, and then they were incubated in the dark at 21℃ for 619 d. Periodical measurements of C mineralized to carbon dioxide(CO_2) were carried out throughout the 619-d incubation to allow the mineralization of both active and slow organic matter pools. The amount of sorbed glucose was calculated as the difference between the total and remaining amounts of glucose added in a soil extract. Two different models, the Freundlich and Langmuir models, were selected to assess the equilibrium isotherms of glucose sorption. The CO_2-C release strongly depended on the presence of nutrients only when no biochar was added to the soil. The mineralization of organic matter in the soil amended with both biochar and glucose was equal to the sum of the mineralization of the two C sources separately. Furthermore, a significant amount of glucose can be sorbed on the biochar-amended soil, suggesting the involvement of physico-chemical mechanisms in labile organic matter protection.  相似文献   

5.
We investigated 15N abundance （δ15N） of winter wheat （Triticum aestivum cv. Jinmai 1） plants and soil at different growth stages in a field with a 13-year fertilization history of urea and compost, to determine whether or not the δ15N of plant parts can be used as an indicator of organic amendment with compost. Plant parts （roots, leaves, stems and grains） and soil were sampled at re-greening, jointing, grain filling and mature growth stages of winter wheat. There were significant differences between the urea and compost treatments in 815N of whole plants, plant parts and soil over the whole growing season. Determination of the δ15N of plant parts was more convenient than that of whole plant to distinguish between the application of organic amendment and synthetic N fertilizer.  相似文献   

6.
A. M. MAHDY 《土壤圈》2011,21(6):773-781
A greenhouse experiment was conducted to test and compare the suitability of saline compost and saline irrigation water for nutrient status amendment of a slightly productive sandy clay loam soil,to study the macronutrient utilization and dry matter production of wheat(Triticum aestivum c.v.Gemmiza 7) grown in a modified soil environment and to determine the effects of compost and saline irrigation water on soil productivity.The sandy clay loam soil was treated with compost of five rates(0,24,36,48,and 60 m 3 ha-1,equivalent to 0,3,4.5,and 6 g kg-1 soil,respectively) and irrigation water of four salinity levels(0.50(tap water),4.9,6.3,and 8.7 dS m-1).The results indicated that at harvest,the electrical conductivity(EC) of the soil was significantly(P < 0.05) changed by the compost application as compared to the control.In general,the soil salinity significantly increased with increasing application rates of compost.Soluble salts,K,Cl,HCO 3,Na,Ca,and Mg,were significantly increased by the compost treatment.Soil sodium adsorption ratio(SAR) was significantly affected by the salinity levels of the irrigation water,and showed a slight response to the compost application.The soil organic carbon content was also significantly(P < 0.05) affected by application of compost,with a maximum value of 31.03 g kg-1 recorded at the compost rate of 60 m 3 ha-1 and the irrigation water salinity level of 8.7 dS m-1 and a minimum value of 12.05 g kg 1 observed in the control.The compost application produced remarkable increases in wheat shoot dry matter production.The maximum dry matter production(75.11 g pot-1) occurred with 60 m 3 ha-1 compost and normal irrigation water,with a minimum of 19.83 g pot-1 with no addition of compost and irrigation water at a salinity level of 8.70 dS m-1.Significant increases in wheat shoot contents of K,N,P,Na,and Cl were observed with addition of compost.The relatively high shoot N values may be attributed to increases in N availability in the tested soil caused by the compost application.Similarly,significant increases in the shoot contents of Na and Cl may be ascribed to the increase in soil soluble K and Cl.The increases in shoot P,N,and K contributed to the growth stimulation since P supplied by the compost was probably responsible in saline and alkaline soils where P solubility was very low.  相似文献   

7.
半干旱土添加有机改良剂后有机质的化学结构变化   总被引：1，自引：0，他引：1  
A 9-month incubation experiment using composted and non-composted amendments derived from vine pruning waste and sewage sludge was carried out to study the effects of the nature and stability of organic amendments on the structural composition of organic matter (OM) in a semi-arid soil.The changes of soil OM,both in the whole soil and in the extractable carbon with pyrophosphate,were evaluated by pyrolysis-gas chromatography and chemical analyses.By the end of the experiment,the soils amended with pruning waste exhibited less organic carbon loss than those receiving sewage sludge.The non-composted residues increased the aliphatic-pyrolytic products of the OM,both in the whole soil and also in the pyrophosphate extract,with the products derived from peptides and proteins being significantly higher.After 9 months,in the soils amended with pruning waste the relative abundance of phenolic-pyrolytic products derived from phenolic compounds,lignin and proteins in the whole soil tended to increase more than those in the soils amended with sewage sludge.However,the extractable OM with pyrophosphate in the soils amended with composted residues tended to have higher contents of these phenolic-pyrolytic products than that in non-composted ones.Thus,despite the stability of pruning waste,the composting of this material promoted the incorporation of phenolic compounds to the soil OM.The pyrolytic indices (furfural/pyrrole and aliphatic/aromatic ratios) showed the diminution of aliphatic compounds and the increase of aromatic compounds,indicating the stabilization of the OM in the amended soils after 9 months.In conclusion,the changes of soil OM depend on the nature and stability of the organic amendments,with composted vine pruning waste favouring humification.  相似文献   

8.
To evaluate the use of organic amendments as an alternative to conventional fertilization,a 10-year experiment on a loam soil was conducted under a crop rotation system in both greenhouse and outdoor plots applied with chemical fertilizers (NPK) and vegetal compost (organic fertilizer) in the Guadalquivir River Valley,Spain.The effect of these two different fertilization regimes on the soil physical properties was evaluated.Soil organic carbon (OC),soil bulk density (BD),soil water retention (WR),available water content (AWC),aggregate stability (AS),and soil physical quality (Dexter’s index,S) were determined.The use of organic fertilizer increased OC and resulted in a significant increase in AS and a decrease in BD compared to the mineral fertilizer application in both greenhouse and outdoor plots.The outdoor plots showed the lowest BD values whereas the greenhouse plots showed the highest AS values.In the last years of the 10-year experiment the S parameter was significantly higher in organic fertilizer plots,especially for greenhouse plots.At the end of the study period,there were no significant differences in WR at field capacity (FC) between treatments in both systems;the AWC was also similar in the greenhouse plots but higher in the mineral outdoor plots.In mineral fertilizer treatments,a small improvement in the physical properties was also observed due to the utilization of less aggressive tillage compared with the previous intensive cropping system.Physical soil properties were correlated with soil OC.The sustainable management techniques such as the use of organic amendments and low or no tillage improved soil physical properties,despite the differences in management that logically significantly affected the results.  相似文献   

9.
Diuron is frequently detected in surface- and groundwater under the vineyards, where organic amendments are often used, in Burgundy of France. Undisturbed column experiments were conducted to study the influence of three composted organic amendments on diuron leaching through columns of two vineyard soils from Vosne-Roman′ee(VR, calcareous Cambisol) and Beaujolais(Bj, sandy Leptosol), France. Bromide(used as non-reactive tracer) and diuron breakthrough curves(BTCs) were analyzed using convectivedispersive equation(CDE), two-region(mobile-immobile, MIM) and two-site models. No influence of the composts was observed on the bromide recovery rates. The CDE model described well the bromide BTCs for all columns of the Bj soil and seven of the VR soil, suggesting a homogeneous water flow. However, for five VR soil columns, the MIM model fitted better, suggesting a partition of the water flow(15%–50% of matrix flow). The texture, the coarse material content and the tillage of the VR soil could explain this heterogeneity. However, for all columns, diuron leaching was greater through the Bj soil(46%–68%) than the VR soil(28%–39%). The compost addition resulted in a contrasting effect on diuron leaching: no difference or a decrease was observed for the VR soil, probably due to an increase of adsorption sites, whereas no difference or an increase was observed for the Bj soil possibly because of interactions and/or competition of diuron with the compost water-extractable organic matter which could facilitate its transport. All the diuron BTCs were best described using the two-site model, suggesting a large proportion of time-dependent sorption sites(30%–50%). The soil type and the nature of the amendments had contrasting influences on diuron transport. Composts with a high water-soluble fraction must be avoided in sandy soils to reduce the risk of groundwater contamination.  相似文献   

10.
湿热灭菌和氯化汞灭菌对双液相体系中PAHs降解的影响   总被引：1，自引：0，他引：1  
A two-liquid-phase(TLP) soil slurry system was employed to quantify the efficiencies of autoclaving and mercuric chloride sterilization in the dissipation of polycyclic aromatic hydrocarbons(PAHs).The fates of 11 PAHs(naphthalene,fluorene,phenanthrene,anthracene,fluoranthene,pyrene,benzo(a)anthracene,benzo(a)pyrene,benzo(b)fluoranthene,benzo(k)fluoranthene,dibenzo(a,h)anthracene) were recorded over 113 days of incubation.No microorganisms were detected in the HgCl 2-sterilized soil slurries during the whole incubation period,indicating very effective sterilization.However,about 2%-36% losses of PAHs were observed in the HgCl 2 sterilized slurry.In contrast to the HgCl 2-sterilized soil slurry,some microorganisms survived in the autoclaved soil slurries.Moreover,significant biodegradation of 6 PAHs(naphthalene,fluorene,phenanthrene,anthracene,fluoranthene and pyrene) was observed in the autoclaved soil slurries.This indicated that biodegradation results of PAHs in the soil slurries,calculated on basis of the autoclaved control,would be underestimated.It could be concluded that the sterilization efficiency and effectiveness of HgCl 2 on soil slurry was much higher than those of autoclaving at 121℃ for 45 min.  相似文献   

11.
采用实验室营养液水培方法,主要研究了离子液体1-甲基-3-乙基-咪唑缬氨酸盐（[C2mim][Val]）对小麦幼苗生长及叶片保护酶活性的影响。结果表明,就小麦种子发芽这一生态毒理指标而言,[C2mim][Val]浓度为200～500mg·L-1时其发芽率显著降低;从生长角度来看,小麦幼苗对100～200mg·L-1浓度的处理不敏感,生长指标没有显著变化,在300～500mg·L-1处理下,小麦幼苗地上部及地下部生物量、株高、根长发生显著变化,均受到明显的抑制,且抑制效应具有典型的剂量依赖型特点。不同浓度[C2mim][Val]处理均致使超氧化物歧化酶（SOD）活性下降,且浓度越高抑制作用越明显;100～200mg·L-1浓度处理在8～13d过氧化物酶（POD）活性高于对照,后期不显著,300～500mg·L-1浓度胁迫后期（18d）,其活性均发生显著的变化,分别为对照的84%、83%、74%,并造成膜脂过氧化产物丙二醛（MDA）含量升高,表明300～500mg·L-1浓度胁迫使植物生长受到抑制。[C2mim][Val]的亲水性及亲脂特性可能是其对植物存在潜在毒性的2个主要原因。  相似文献   

12.
为缓解不溶性磷酸盐累积造成的盐碱土壤板结问题,从江苏滨海盐碱土壤中筛选到一株具有较强溶磷能力的真菌菌株SM-1,并初步鉴定为Apophysomyces sp.,同时考察了木醋液对该菌生长及溶磷效果的影响。结果表明,木醋液的添加能够显著影响菌株SM-1的生长,添加量为0.1%的木醋液是其最适宜的生长浓度。菌株SM-1对不同磷源有着不同的分解能力,其中对磷酸三钙的分解能力最佳,培养基中水溶磷含量由93 mg·L~(-1)提高到246.9 mg·L~(-1)。木醋液对供试磷源没有分解效果,但添加木醋液则能够显著提高菌株对磷矿粉的分解能力,培养基中水溶磷含量由79 mg·L~(-1)提高到115.3 mg·L~(-1),而对磷酸三钙的分解能力与单独接入菌株SM-1的效果相当。这预示着菌株SM-1与木醋液混合使用在改善盐碱化土壤肥力方面具有很好的应用前景。  相似文献   

13.
实验研究了纳米二氧化铈（CeO2）对斜生栅藻的毒性效应。结果显示,当纳米二氧化铈浓度为5、10mg·L-1时,对斜生栅藻的生长有促进作用（P〈0.01）,其促进作用随着浓度增大而减小;至浓度为50mg·L-1时,开始变为抑制效应;当浓度达到100、200mg·L-1时,表现出显著的抑制作用（P〈0.01）,且抑制作用随着浓度增大而增大。光镜拍照和藻细胞直径的变化表现出,随着处理浓度的增大,细胞有小型化的趋势。处理7d后,纳米二氧化铈对叶绿素和SOD含量的影响和对藻密度的影响一致,而对MDA含量的影响刚好相反,说明细胞膜发生了不同程度的脂质过氧化反应。  相似文献   

14.
以多花黑麦草(Lolium multiflorum)为试材,通过水培试验方法,研究不同浓度梯度铝胁迫对黑麦草幼苗根系抗氧化酶活性和丙二醛含量的诱导特征,从而揭示黑麦草根系耐铝机制。结果表明:(1)在整个试验过程中,SOD、POD、CAT活性变化规律相一致。当铝浓度介于0~50 mg L-1范围内,SOD、POD、CAT在整个实验过程中活性显著增加(P<0.05),高于对照,并在50 mg L-1铝浓度处理下,活性达到最大;当铝浓度为100 mg L-1时,SOD、POD、CAT在铝处理时间≤8 h时活性显著增加(P<0.05),高于对照,在铝处理时间>8 h时活性明显降低(P<0.05),低于对照;当铝浓度介于100~500 mg L-1范围内,SOD、POD、CAT在整个实验过程中活性先升高(≤8 h)后降低(>8 h),均明显低于对照(P<0.05)。(2)MDA含量变化趋势同SOD、POD、CAT活性变化趋势正好相反。当铝浓度介于0~50 mg L-1范围内,MDA在整个实验过程中含量显著降低(P<0.05),低于对照,并在50 mg L-1铝浓度处理下,含量达到最小;当铝浓度为100 mg L-1时,MDA在铝处理时间≤8 h时含量显著降低(P<0.05),低于对照,在铝处理时间>8 h时含量明显升高(P<0.05),高于对照;当铝浓度介于100~500 mgL-1范围内,MDA在整个实验过程中含量先降低(≤8 h)后升高(>8 h),均明显高于对照(P<0.05)。研究结果表明黑麦草根系在短时间内对铝胁迫有一定的耐性,并且耐受范围随着铝处理时间的延长而变小。  相似文献   

15.
为了获得一株产电菌株,并研究其产电性能。采用厌氧分离法从微生物燃料电池中分离出一株新的产电菌株LY-2,通过菌株形态、生理生化特性及16S rDNA系统发育分析做分类学鉴定,采用循环伏安扫描及菌种在微生物燃料电池中产电情况做产电特性验证。结果表明,该菌与Dysgonomonas mossii最相近,命名为Dysgonomonas mossii LY-2。循环伏安扫描显示,该菌具有电化学活性,接种到微生物燃料电池中,以牛肉膏为燃料产生的最大电压为0.61V,最大功率密度为104.3 mW/m2,具有在微生物燃电池中产电研究和应用的前景。  相似文献   

16.
农药草甘膦在砂质潮土上的迁移行为及其影响因素   总被引：1，自引：0，他引：1  
化学物质在土壤中的移动性是人们精确评价其潜在淋溶能力(即对地下水的污染风险)的必要信息。通过一次平衡法和饱和土柱稳定流混合置换实验,来阐明环境pH变化和磷酸盐施用对草甘膦在砂质潮土中的吸附和迁移行为的影响。结果表明,草甘膦在砂质潮土上的吸附量随着pH的增大而降低,在pH4~6的范围内吸附量变化最明显;其穿透曲线(BTCs)均呈现不同程度的不对称性,加入的草甘膦浓度越低这种不对称性越明显;在本实验条件下,施用磷酸盐有抑制草甘膦迁移的趋势,但其抑制趋势并非随磷酸盐施用量的增加而持续增加。如加入草甘膦浓度为500 mg L-1,不加磷酸盐P0时,流出液中草甘膦峰值为459.8mg L-1,而加入磷酸盐P1和P2时,其峰值分别为147.3 mg L-1和373.6 mg L-1。推测其原因可能与磷酸盐施用导致环境pH降低及磷酸盐在加草甘膦前已经占据过多的吸附位点有关。  相似文献   

17.
龙葵（Solanum nigrumL.）是Cd超累积植物,可用于植物冶金和Cd污染土壤的植物修复。超累积植物的生理基础研究有助于提高其对Cd的富集效率。龙葵种子在含有不同浓度CdCl（20、30、50、100、150、200μmol·L-1和300μmol·L-1）的琼脂培养基上萌发7d。结果表明,龙葵在200μmol·L-1和300μmol·L-1Cd时发芽率显著降低,而低浓度Cd（30～150μmol·L-1）胁迫下无显著差异;在Cd≥30μmol·L-1时,活力指数、发芽势均显著降低,幼苗的生长受到显著抑制。幼苗生长分析表明：在30～150μmol·L-1Cd处理下根长下降约17%～35%,显著低于200～300μmol·L-1Cd处理（下降79%～90%）;株高随Cd浓度的升高逐渐下降。子叶抗氧化酶活性分析表明：100～150μmol·L-1Cd胁迫下,CAT和APX活性显著上升;在Cd胁迫下,SOD活性降低但维持在较高的活性水平。表明龙葵幼苗能忍耐小于150μmol·L-1Cd,抗氧化酶活性在抵抗Cd毒害方面发挥重要作用。  相似文献   

18.
为了解土壤在Pb、Cd单一以及复合污染条件下红薯对Pb、Cd的吸收和积累规律,通过盆栽试验对红薯地上部和地下部的生物量和重金属含量进行测定,分析了单一及复合污染土壤中重金属Pb、Cd形态分布特点。结果表明,相对于对照,较低浓度的Pb、Cd能显著促进红薯的生长（P〈0.05）,Pb超过50mg.kg-1、Cd超过3mg.kg-1时,红薯生长受到显著抑制（P〈0.05）,Cd是影响红薯生长的主要因素;随着试验处理浓度的升高,红薯体内重金属含量也随之升高,二者之间存在极显著的相关性（P〈0.01）,Pb、Cd共存对红薯吸收累积Pb、Cd具有明显的交互作用,Pb促进Cd向地上部转移,Cd促进Pb在地下部积累。根际土壤中Pb、Cd以可交换态与碳酸盐结合态为主,二者均占总量的55以上,在复合污染条件下,Pb浓度为50mg.kg-1时其活性系数显著高于其他Pb处理（P〈0.05）,并在很大程度上促进有效态Cd含量的增加。  相似文献   

19.
A pot trial with acid yellow-brown soil was conducted to investigate the effects of molybdenum (Mo) and phosphorus (P) fertilizers on cold resistances of winter wheat. Molybdenum was applied at two rates (0 and 0.15 mg Mo kg?1 soil) and P at four rates [0, 100, 200, and 300 mg phosphorus pentoxide (P2O5) kg?1 soil] in experiment 1. Both Mo and P fertilizers were applied at two rates (0 and 0.15 mg Mo kg?1 soil; 0, 150 mg P2O5 kg?1 soil) in experiment 2. Seed yield, soluble sugar, water-soluble protein, ascorbic acid (AsA), malondialdehyde (MDA), and abscisic acid (ABA) concentrations were studied. The results indicated that Mo and P fertilizer increased seed yield, soluble sugar, water-soluble protein, and AsA but decreased the MDA. It implied that appropriate Mo applied with P application had beneficial effects on increasing seed yield and enhancing the cold resistance ability through changing biological substances concentration in winter wheat.  相似文献   

20.
采用温室盆栽土培方法,研究了土壤中不同浓度重金属铅（Pb,0-800 mg.kg^-1）、镉（Cd,0-50 mg.kg^-1）单一及其复合处理对玉米（Zea mays L.）生长及土壤微生物（细菌、放线菌、真菌）数量的影响。结果表明,在重金属Pb、Cd单一及其复合处理下,玉米的株高、干重均低于对照,重金属Pb、Cd处理对玉米的生长存在负面影响。重金属Pb、Cd单一处理抑制细菌、真菌的生长,中低浓度Pb（≤300 mg.kg^-1）、Cd（≤10 mg.kg^-1）单一处理促进放线菌数量的增加,高浓度（Pb≥800 mg.kg^-1、Cd≥50 mg.kg^-1）则呈现抑制效应;Pb、Cd复合在高中低浓度下都抑制土壤微生物生长,减少微生物数量。玉米株高同土壤微生物之间相关性不显著;玉米干重同土壤细菌、真菌显著相关,同土壤放线菌之间相关性不显著。  相似文献   

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