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硝化抑制剂对稻田土壤N2O排放和硝化、反硝化菌数量的影响 总被引:1,自引:0,他引:1
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生物质炭对酸性菜地土壤N2O排放及相关功能基因丰度的影响 总被引:4,自引:2,他引:2
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为探索生物硝化抑制剂对贵州黔西南地区黄壤硝化作用及氧化亚氮(N2O)排放的影响,通过三周的室内培养试验,研究两种生物硝化抑制剂对羟基苯丙酸甲酯(MHPP)和丁香酸(SA)对黄壤中的无机态氮素含量、氨氧微生物功能基因以及N2O排放量的影响。结果表明,与对照CK相比,MHPP和SA在黄壤上均能明显抑制硝化作用,对土壤硝化速率的抑制率分别为6%~43%和5%~51%。MHPP和SA均抑制了黄壤氨氧化古菌AOA(12%~22%,27%~41%)与氨氧化细菌AOB(6%~19%,26%~46%)amoA基因的丰度。整个培养期内,黄壤的硝态氮含量与AOB的amoA基因丰度显著正相关,而与AOA的amoA基因丰度无显著相关,表明AOB对黄壤硝化作用起了主导作用。在N2O排放方面,MHPP和SA分别显著抑制了黄壤51%和21%的N2O排放积累量,MHPP的减排效果优于SA。MHPP降低了黄壤N2O排放的峰值,而SA主要延缓了黄壤N2O产生高峰的出现。总之,生物硝化抑制剂MHPP和SA在贵州黔西南黄壤上具有氮肥减施增效的潜力,这为今后烤烟新型绿色专用肥的开发提供了理论依据。 相似文献
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有机和无机肥配比对黄褐土硝化和反硝化微生物丰度及功能的影响 总被引:5,自引:1,他引:4
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不同形态氮添加对毛竹林土壤N2O排放的影响 总被引:2,自引:1,他引:1
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土壤反硝化作用是土壤N2O产生的重要过程,亚硝酸盐还原酶(NIR)催化的亚硝态氮(NO-2)还原为一氧化氮(NO)是反硝化作用的关键环节,研究长期施肥对反硝化微生物的影响及其与N2O排放的关系对于全面理解土壤反硝化过程具有重要意义。基于28年的旱作雨养长期施肥试验,通过常规监测、定量PCR和高通量测序等探讨了长期不同施肥(不施肥CK、偏施肥的单施氮肥N和氮钾配施NK、以及氮磷钾平衡施肥NPK)下土N2O排放和nirS反硝化细菌群落特征及两者之间的关系。结果表明:长期化肥施用(N,NK和NPK)均显著提高了N2O累积排放量,其中平衡施肥(NPK)最高。长期化肥施用对nirS基因丰度和nirS型反硝化细菌的α-多样性无显著影响,但长期平衡施用化肥提高了uncultured_bacterium_2303和Rhodanobacter_sp._D206a的相对丰度,降低了unclassified_k_norank_d_Bacteria和unclassified_p_Proteobacteria的相对丰度,从而改变了nirS型反硝化细菌的群落结构组成。雨养旱作条件下,土壤有机碳(SOC)、全氮(TN)、有效磷(AP)和pH等土壤性质是土nirS型反硝化细菌群落结构组成变化的主要影响因素。土nirS型反硝化细菌群落结构组成对土壤N2O排放具有显著影响,而nirS基因丰度和nirS型反硝化细菌多样性并没有显著影响。 相似文献
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硝化抑制剂对毛竹林土壤N_2O排放和氨氧化微生物的影响 总被引:4,自引:3,他引:1
为了探索硝化抑制剂在毛竹生产中的施用技术,通过培养试验研究3,4-二甲基吡唑磷酸盐(DMPP)和双氰胺(DCD)两种硝化抑制剂对毛竹林施用尿素后土壤N2O排放、氮素转化和相关氨氧化细菌(AOB)、氨氧化古菌(AOA)群落结构和丰度的影响。试验设(1)对照(CK)、(2)单施尿素(Urea)、(3)尿素+1%DMPP(DMPP占总N的1%,下同);(4)尿素+1.5%DMPP;(5)尿素+10%DCD;(6)尿素+15%DCD等6个处理,测定N2O的排放动态以及气体排放转折点时的土壤特征指标。结果表明:与单施尿素相比,160 d的时间内两种DMPP用量处理的土壤N2O累积排放减排幅度均为54%,而10%DCD和15%DCD处理的土壤分别减少28%和41%。DMPP和DCD处理50 d和90 d时土壤的NH4+-N含量均显著高于(p0.05)单施尿素处理,而NO3--N含量和表观硝化率则恰好相反,但两种抑制剂间无差异。DMPP处理的AOB群落结构的变化从10 d开始显现,至50 d和90 d时仍保持明显的抑制状态,而DCD处理则至90 d时抑制作用基本消失。单施尿素AOB功能基因(amo A)的丰度均显著高于硝化抑制剂处理(90 d时尿素+10%DCD处理除外);在整个培养期内,尿素和对照土壤的AOA群落结构相似,硝化抑制剂反而增加了AOA功能基因的丰度,表明硝化抑制剂对AOA丰度无明显抑制作用。即两种硝化抑制剂主要通过抑制AOB起作用;调节土壤p H至中性范围,并在1%DMPP施用条件下,硝化抑制剂的抑制效果最显著。 相似文献
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长期施肥对棕壤氨氧化细菌和古菌丰度的影响 总被引:7,自引:1,他引:6
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脲酶抑制剂与硝化抑制剂对稻田土壤硝化、反硝化功能菌的影响 总被引:4,自引:2,他引:2
[目的]在农业生产中,脲酶抑制剂(urease inhibitor,UI)与硝化抑制剂(nitrification inhibitor,NI)常作为氮肥增效剂来提高肥料利用率。本文研究了在我国南方红壤稻田施用脲酶抑制剂与硝化抑制剂后,土壤中氨氧化细菌(ammonia oxidizing bacteria,AOB)、氨氧化古菌(ammonia-oxidizing archaea,AOA)以及反硝化细菌的丰度以及群落结构的变化特征,旨在揭示抑制剂的作用机理及其对土壤环境的影响。[方法]试验在我国南方红壤稻田进行,共设5个处理:1)不施氮肥(CK);2)尿素(U);3)尿素+脲酶抑制剂(U+UI);4)尿素+硝化抑制剂(U+NI);5)尿素+脲酶抑制剂+硝化抑制剂(U+UI+NI),3次重复。脲酶抑制剂与硝化抑制剂分别为NBPT[N-(n-butyl)thiophosphrictriamide,N-丁基硫代磷酰三胺]和DMPP(3,4-dimethylpyrazole phosphate,3,4-二甲基吡唑磷酸盐)。通过荧光定量PCR(Real-time PCR)研究水稻分蘖期与孕穗期抑制剂对三类微生物标记基因拷贝数的影响,并分析土壤铵态氮、硝态氮与三种菌群丰度的相关性;利用变性梯度凝胶电泳(DenaturingGradient Gel Electrophoresis,DGGE)分析抑制剂对土壤AOB、AOA以及反硝化细菌群落结构的影响,并对优势菌群进行系统发育分析。[结果]1)荧光定量PCR结果表明,施用氮肥对两个时期土壤中AOB的amoA基因与反硝化细菌nirK基因的拷贝数均有显著提高,而对AOA的amoA基因始终没有明显影响;AOB与nirK反硝化细菌的丰度与两个时期的铵态氮含量、分蘖期的硝态氮含量呈极显著正相关,与孕穗期的硝态氮含量相关性不显著;DMPP仅在分蘖期显著减少了AOB的amoA基因拷贝数,表明DMPP主要通过限制AOB的生长来抑制稻田土壤硝化过程;NBPT对三类微生物的丰度无明显影响;2)DGGE图谱表明,在分蘖期与孕穗期,施用氮肥均明显增加了图谱中AOB的条带数,而对AOA却没有明显影响;氮肥明显增加了孕穗期反硝化细菌的条带数;与氮肥的影响相比,抑制剂NBPT与DMPP对AOA、AOB以及反硝化菌的群落结构影响甚微;系统发育分析结果表明,与土壤中AOB的优势菌群序列较为接近的有亚硝化单胞菌和亚硝化螺菌。[结论]在南方红壤稻田中,施入氮肥可显著提高AOB与反硝化细菌的丰度,明显影响两种菌群的群落结构,而AOA较为稳定;NBPT对三类微生物的群落结构丰度无明显影响;硝化抑制剂DMPP可抑制AOB的生长但仅表现在分蘖期,这可能是其缓解硝化反应的主要途径;这也说明二者对土壤生态环境均安全可靠。 相似文献
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Yajun GENG Yiming YUAN Yingcheng MIAO Junzhang ZHI Mengyuan HUANG Yihe ZHANG Hong WANG Qirong SHEN Jianwen ZOU Shuqing LI 《土壤圈》2021,31(2):279-288
Bio-organic fertilizers enriched with plant growth-promoting microbes(PGPMs)have been widely used in crop fields to promote plant growth and maintain soil microbiome functions.However,their potential effects on N2O emissions are of increasing concern.In this study,an in situ measurement experiment was conducted to investigate the effect of organic fertilizer containing Trichoderma guizhouense(a plant growth-promoting fungus)on soil N2O emissions from a greenhouse vegetable field.The following four treatments were used:no fertilizer(control),chemical fertilizer(NPK),organic fertilizer derived from cattle manure(O),and organic fertilizer containing T.guizhouense(O+T,referring to bio-organic fertilizer).The abundances of soil N cycling-related functional genes(amoA)from ammonium-oxidizing bacteria(AOB)and archaea(AOA),as well as nirS,nirK,and nosZ,were simultaneously determined using quantitative PCR(qPCR).Compared to the NPK plot,seasonal total N2O emissions decreased by 11.7%and 18.7%in the O and O+T plots,respectively,which was attributed to lower NH4+-N content and AOB amoA abundance in the O and O+T plots.The nosZ abundance was significantly greater in the O+T plot,whilst the AOB amoA abundance was significantly lower in the O+T plot than in the O plot.Relative to the organic fertilizer,bio-organic fertilizer application tended to decrease N2O emissions by 7.9%and enhanced vegetable yield,resulting in a significant decrease in yield-scaled N2O emissions.Overall,the results of this study suggested that,compared to organic and chemical fertilizers,bio-organic fertilizers containing PGPMs could benefit crop yield and mitigate N2O emissions in vegetable fields. 相似文献
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生物质炭在温室气体减排方面具有很大的发展前景,它不仅能实现固碳,对于在大气中停留时间长且增温潜势大的N2O也能发挥积极作用。本研究采用室内厌氧培养试验,按照生物质炭与土壤质量比(0、1%和5%)加入一定量生物质炭,土壤重量含水率控制在20%。利用Robotized Incubation平台实时检测N2O和N2浓度变化,通过测定土壤中反硝化功能基因丰度(nirK、nirS、nosZ)分析生物质炭对N2O消耗的影响及其微生物方面的影响机理。结果表明:经过20 h厌氧培养后,0生物质炭处理的反硝化功能基因丰度(基因拷贝数·g-1)分别为6.80×107(nirK)、5.59×108(nirS)和1.22×108(nosZ)。与0生物质炭处理相比,1%生物质炭处理的nirS基因丰度由最初的2.65×108基因拷贝数·g-1升至7.43×108基因拷贝数·g-1,nosZ基因丰度则提高了一个数量级,由4.82×107基因拷贝数·g-1升至1.50×108基因拷贝数·g-1,然而nirK基因丰度并无明显变化;5%生物质炭处理的反硝化功能基因丰度并未发生显著变化。试验结束时,添加生物质炭处理的N2/(N2O+N2)比值也明显高于0生物质炭处理。相关性分析结果表明,nirS基因丰度和nosZ基因丰度均与N2O浓度在0.01水平上显著相关。试验末期nirS基因丰度和nosZ基因丰度均随着N2O浓度的降低而升高。因此在本试验中,添加1%生物质炭可显著提高nirS和nosZ基因型反硝化细菌的丰度,增大N2/(N2O+N2)比值,促进N2O彻底还原成N2。生物质炭对于N2O主要影响机理是增大了可以还原氧化亚氮的细菌活性,促进完全反硝化。 相似文献
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Simulated animal trampling of a free‐draining stony soil stimulated denitrifier growth and increased nitrous oxide emissions 下载免费PDF全文
Winter forage grazing systems in New Zealand cause compaction of soil by grazing animals, especially when the soil is wet. However, there is little information on the effects of animal trampling on denitrifiers in soil, despite their importance for N2O production. Here, we report a field study of the abundance of the denitrifying genes nirS, nirK, and nosZ and N2O emissions following the application of dairy cow urine in a free‐draining stony soil. Importantly, we found that simulated animal trampling altered some of the denitrifying microbial communities, thus leading to increased N2O emissions. Over the 111 day measurement period, the abundance of nitrite (NO2?)‐reducing nirS gene copy numbers increased significantly by 87% in the trampled soil with urine (P < 0.01) and increased by 40% in the trampled soil without urine (P < 0.05), but the nirS gene abundance did not change significantly in the nontrampled soil. The abundance of NO2? reducing nirK gene copy numbers was not affected by trampling, but increased significantly following urine application. The abundance of N2O‐reducing nosZ clade I and nosZ clade II gene copy numbers increased significantly in the trampled soil, but did not change significantly in the nontrampled soil. N2O emissions from the trampled soil were about twice that from the nontrampled soil without urine (1.20 and 0.62 kg N2O‐N per ha, respectively) and about eight times greater (6.24 kg N2O‐N per ha) than from nontrampled soil (0.80 kg N2O‐N per ha) when urine was applied. These results strongly suggest that animal trampling during winter forage grazing can have a major impact on denitrifying communities in soil, which in turn stimulate greater denitrification with increased N2O emissions. 相似文献
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AbstractMicrobial nitrification and denitrification are responsible for the majority of soil nitrous (N2O) emissions. In this study, N2O emissions were measured and the abundance of ammonium oxidizers and denitrifiers were quantified in purple soil in a long-term fertilization experiment to explore their relationships. The average N2O fluxes and abundance of the amoAgene in ammonia-oxidizing bacteria during the observed dry season were highest when treated with mixed nitrogen, phosphorus and potassium fertilizer (NPK) and a single N treatment (N) using NH4HCO3as the sole N source; lower values were obtained using organic manure with pig slurry and added NPK at a ratio of 40%:60% (OMNPK),organic manure with pig slurry (OM) and returning crop straw residue plus synthetic NH4HCO3fertilizer at a ratio of 15%:85% (SRNPK). The lowest N2O fluxes were observed in the treatment that used crop straw residue(SR) and in the control with no fertilizer (CK). Soil NH4+provides the substrate for nitrification generating N2O as a byproduct. The N2O flux was significantly correlated with the abundance of the amoA gene in ammonia-oxidizing bacteria (r = 0.984, p < 0.001), which was the main driver of nitrification. During the wet season, soil nitrate (NO3?) and soil organic matter (SOC) were found positively correlated with N2O emissions (r = 0.774, p = 0.041 and r = 0.827, p = 0.015, respectively). The nirS gene showed a similar trend with N2O fluxes. These results show the relationship between the abundance of soil microbes and N2O emissions and suggest that N2O emissions during the dry season were due to nitrification, whereas in wet season, denitrification might dominate N2O emission. 相似文献
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Since the development of effective N2O mitigation options is a key challenge for future agricultural practice, we studied the interactive effect of tillage systems on fertilizer-derived N2O emissions and the abundance of microbial communities involved in N2O production and reduction. Soil samples from 0–10 cm and 10–20 cm depth of reduced tillage and ploughed plots were incubated with dairy slurry (SL) and manure compost (MC) in comparison with calcium ammonium nitrate (CAN) and an unfertilized control (ZERO) for 42 days. N2O and CO2 fluxes, ammonium, nitrate, dissolved organic C, and functional gene abundances (16S rRNA gene, nirK, nirS, nosZ, bacterial and archaeal amoA) were regularly monitored. Averaged across all soil samples, N2O emissions decreased in the order CAN and SL (CAN?=?748.8?±?206.3, SL?=?489.4?±?107.2 μg kg?1) followed by MC (284.2?±?67.3 μg kg?1) and ZERO (29.1?±?5.9 μg kg?1). Highest cumulative N2O emissions were found in 10–20 cm of the reduced tilled soil in CAN and SL. N2O fluxes were assigned to ammonium as source in CAN and SL and correlated positively to bacterial amoA abundances. Additionally, nosZ abundances correlated negatively to N2O fluxes in the organic fertilizer treatments. Soils showed a gradient in soil organic C, 16S rRNA, nirK, and nosZ with greater amounts in the 0–10 than 10–20 cm layer. Abundances of bacterial and archaeal amoA were higher in reduced tilled soil compared to ploughed soils. The study highlights that tillage system induced biophysicochemical stratification impacts net N2O emissions within the soil profile according to N and C species added during fertilization. 相似文献
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Hongling?Qin Yafang?Tang Jianlin?Shen Cong?Wang Chunlan?Chen Jie?Yang Yi?Liu Xiangbi?Chen Yong?Li Haijun?Hou
Agricultural management significantly affects methane (CH4) and nitrous oxide (N2O) emissions from paddy fields. However, little is known about the underlying microbiological mechanism. Field experiment was conducted to investigate the effect of the water regime and straw incorporation on CH4 and N2O emissions and soil properties. Quantitative PCR was applied to measure the abundance of soil methanogens, methane-oxidising bacteria, nitrifiers, and denitrifiers according to DNA and mRNA expression levels of microbial genes, including mcrA, pmoA, amoA, and nirK/nirS/nosZ. Field trials showed that the CH4 and N2O flux rates were negatively correlated with each other, and N2O emissions were far lower than CH4 emissions. Drainage and straw incorporation affected functional gene abundance through altered soil environment. The present (DNA-level) gene abundances of amoA, nosZ, and mcrA were higher with straw incorporation than those without straw incorporation, and they were positively correlated with high concentrations of soil exchangeable NH4+ and dissolved organic carbon. The active (mRNA-level) gene abundance of mcrA was lower in the drainage treatment than in continuous flooding, which was negatively correlated with soil redox potential (Eh). The CH4 flux rate was significantly and positively correlated with active mcrA abundance but negatively correlated with Eh. The N2O flux rate was significantly and positively correlated with present and active nirS abundance and positively correlated with soil Eh. Thus, we demonstrated that active gene abundance, such as of mcrA for CH4 and nirS for N2O, reflects the contradictory relationship between CH4 and N2O emissions regulated by soil Eh in acidic paddy soils. 相似文献
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氮肥水平对稻田细菌群落及N2O排放的影响 总被引:3,自引:0,他引:3
作为土壤氮素转化的驱动者,微生物群落结构关系着稻田氮素利用及温室气体N_2O排放等问题。本研究分别基于高通量测序和荧光定量PCR技术,分析了不同氮肥水平[CK(不施氮)、N(施N 180 kg·hm-2)、2/3N(施N 120 kg·hm-2)、1/3N(施N 60 kg·hm-2)]下稻田细菌群落及硝化反硝化关键微生物功能基因丰度的变化。结果显示:氮肥水平提高增加了稻田细菌物种丰富度Chao1指数和群落多样性Shannon指数,改变了细菌群落组成,其中与硝化作用相关的硝化螺菌门Nitrospirae和嗜酸的醋杆菌门Acidobacteria的相对丰度随氮肥水平提高而增加,但甲烷氧化菌Methylosinus的相对丰度随氮肥水平提高而降低。氮肥水平对稻田硝化作用关键微生物氨氧化细菌amo A基因丰度的影响较大,0~5 cm和10~20 cm深度土层中的amo A基因丰度均随氮肥用量增加而提高;反硝化作用关键微生物功能基因nir S、qno B和nos Z的丰度在不施肥处理(CK)中显著低于施肥处理(1/3N、2/3N和N)(P0.05),但1/3N、2/3N和N处理的稻田nir S基因丰度没有明显差异;0~5 cm土层中qno B和nos Z基因丰度存在随氮肥水平提高而增加的趋势,10~20 cm土层中nos Z基因丰度在2/3N和N处理下显著高于1/3N处理(P0.05)。N处理的稻田N_2O排放通量显著高于2/3N及1/3N处理(P0.05),后者又显著高于CK处理(P0.05)。相关分析结果表明稻田N_2O排放通量与0~5 cm土层中硝化螺菌门Nitrospirae相对丰度及10~20 cm土层中amo A基因丰度存在显著相关性(P0.05,n=10)。综上所述,氮肥水平提高增加了稻田细菌群落多样性,促进了稻田N_2O排放,且本研究稻田中硝化作用微生物群落及丰度变化与稻田N_2O排放的关系更为密切。 相似文献
18.
This study evaluated the effect of silicate fertilizer on denitrification and associated gene abundance in a paddy soil. A consecutive trial from 2013 to 2015 was conducted including the following treatments: control (CK), mineral fertilizer (NPK), NPK plus sodium metasilicate (NPK + MSF), and NPK plus slag-based silicate fertilizer (NPK + SSF). Real-time quantitative PCR (qPCR) was used to analyze the abundances of nirS, nirK, and nosZ genes. Potential N2O emissions and ammonium and nitrate concentrations were related to the nirS and nirK gene abundance. Compared with the NPK treatments, the addition of a Si fertilizer decreased N2O emission rates and denitrification potential by 32.4–66.6 and 22.0–59.2%, respectively, which were probably related to increased rice productivity, soil Fe availability, and soil N depletion. The abundances of nirS and nirK genes were decreased by 17.7–35.8% and 21.1–43.5% with addition of silicate fertilizers, respectively. Rates of total N2O and N2O from denitrification (DeN2O) emission were positively correlated with the nirS and nirK gene abundance. Nitrate, exchangeable NH4 +, and Fe concentrations were the main factors regulating the nirS and nirK gene abundance. Silicate fertilization during rice growth may serve as an effective approach to decreasing N2O emissions. 相似文献
19.
Xuelian Gan Jing Zhao Qingling Fu Jun Zhu Huan He Hongqing Hu 《European Journal of Soil Science》2023,74(4):e13404
The influence of redox reactions involving carbon-iron coupling (organic carbon and iron oxides) on nitrous oxide (N2O) production in paddy soils remains poorly understood. In this study, two microcosm experiments were conducted to investigate the effects of carbon-iron coupling on N2O emissions, and the underlying mechanisms were verified using quantitative denitrification functional genes (nirS, nirK, nosZI and nosZII) and high-throughput sequencing. The results showed that ferrihydrite (iron) significantly promoted N2O-N emissions (p < 0.05) after adding ammonium nitrogen, while glucose (carbon) significantly inhibited N2O-N emissions (p < 0.05). Carbon-iron coupling significantly decreased N2O-N emissions (p < 0.05) but did not affect soil total nitrogen loss and increased nitrogen (N2) emissions. After adding high concentrations of acetylene (10% C2H2), the N2O-N emissions from carbon-iron coupling treatment increased significantly from 6.4 to 11.9 mg N kg−1 (p < 0.05), which confirmed that the carbon-iron coupling reduced the N2O emissions by promoting the conversion of N2O to N2. The mechanisms behind carbon-iron coupling promoting complete denitrification and reducing N2O emissions were attributed to glucose promoting iron reduction and carbon-iron coupling enhancing the abundance of nosZI (42.7%) and nosZII (16.6%). 相似文献
20.
Yilin DU Xinyu GUO Jinxing LI Yuankun LIU Jipeng LUO Yongchao LIANG Tingqiang LI 《土壤圈》2022,32(1):3-14
Elevated carbon dioxide (CO2)(e CO2) has been shown to affect the nitrous oxide (N2O) emission from terrestrial ecosystems by altering the interaction of plants,soils,and microorganisms.However,the impact of e CO2 on the N2O emission from agricultural soils remains poorly understood.This meta-analysis summarizes the effect of e CO2 on N2O emission in agricultural ecosystems and soil physiochemical and biological characteristics using 50 publications selected.The e CO2 effect values,which equal to the percentage changes of N2O emission under e CO2,were calculated based on the natural logarithm of the response ratio to e CO2.We found that e CO2 significantly increased N2O emission (by 44%),which varied depending on experimental conditions,agricultural practices,and soil properties.In addition,e CO2 significantly increased soil water-filled pore space (by 6%),dissolved organic carbon content (by11%),and nitrate nitrogen content (by 13%),but significantly reduced soil p H (by 1%).Moreover,e CO2 significantly increased soil microbial biomass carbon(by 28%) and soil microbial biomass nitrogen (by 7%) contents.Additionally,e CO2 significantly increased the abundances of ammonia-oxidizing bacteria(AOB) amo A (by 21%),nir K (by 15%),and nir S (by 15%),but did not affect the abundances of ammonia-oxidizing archaea (AOA) amo A and nos Z.Our findings indicate that e CO2 substantially stimulates N2O emission in agroecosystems and highlight that optimization of nitrogen management and agronomic options might suppress this stimulation and aid in reducing greenhouse effect. 相似文献