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蚯蚓作用下土壤化学组成和性状的动态变化 总被引：5，自引：0，他引：5
通过室内培养试验研究赤子爱胜蚓(Eiseniafoetida)和威廉环毛蚓(Metaphire guillelmi)对土壤化学组成和性状的动态影响.结果表明:接种蚯蚓可显著提高土壤pH和电导率;蚯蚓作用49 d后土壤化学组成也发生明显变化,接种赤子爱胜蚓和威廉环毛蚓处理的土壤碳水化合物含量分别比对照增加43.22,44.76 mg/kg,酸解氨基酸含量分别增加15.34,12.52 g/kg,植物激素GA3含量分别增加11.21,13.68mg/kg,IAA含量分别增加8.99,8.81mg/kg,而多酚含量却显著降低了7.79,7.48mg/kg.不同处理土壤化学组成和性状随时间变化趋势各有不同,2种蚯蚓作用下,土壤pH和碳水化合物含量均在前7d急剧增加,之后变化趋于平缓;而土壤多酚含量在前7d显著降低,此后也趋于平缓;土壤植物激素GA3含量在前35 d持续增加,而后无显著变化;土壤植物激素IAA、电导率和氨基酸含量随培养时间增加而持续增长,直至培养结束(49 d). 相似文献
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对“赤子爱胜蚓”处理鸡粪的试验研究结果表明:蚯蚓在堆肥7d以上鸡粪中的生长和繁殖情况均比干鸡粪中好;堆肥28d的饵料中,蚯蚓日增重倍数最高达0.08;堆肥35d的饵料中,蚯蚓日繁殖倍数最高达0.13。与饵料相比,蚓粪C/N值降低,NH4-N含量显著下降,而NO3-N含量显著升高。 相似文献
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不同生活型蚯蚓蚓粪化学组成及其性状的研究 总被引：2，自引：1，他引：1
蚓粪已经渐渐成为国内外研究者所关注的一个焦点,而对蚓粪化学成分及性状的研究也逐渐引起了人们的注意.本文研究比较了两种不同生活型蚯蚓蚓粪和对照土壤之间的化学组成及性状的异同.结果表明:蚓粪和对照土壤相比,有着更高的pH和电导率值,且差异显著(P＜0.05);蚓粪比对照土壤有着更多的碳水化合物和更少的多酚类物质,差异分别达31.36～ 33.81 mg/kg和4.28 ～ 5.08 mg/kg;同时,蚓粪内酸解氨基酸含量要比对照土壤高出3.84～5.06mg/g;植物激素GA3相对于对照土壤增幅达35％～ 114％,而IAA的增幅则为78％～236％.在相同的环境下,同样生物量的环毛蚓(威廉环毛蚓)和爱胜蚓(赤子爱胜蚓)对蚓粪pH值、碳水化合物和多酚含量的作用无显著差异(P＞0.05);对蚓粪电导率、植物激素和氨基酸含量的影响爱胜蚓要显著大于环毛蚓.总之,蚓粪的pH值、电导率和化学组成与对照土壤相比都有着显著的差异,不同生活习性的蚯蚓蚓粪也会有着一定的不同. 相似文献
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为探讨赤子爱胜蚓谷胱甘肽(GSH)和丙二醛(MDA)含量变化对重金属污染土壤生态毒性的指示作用,在试验室模拟条件下,利用人工土壤和自然土壤,研究了重金属含量与蚯蚓GSH和MDA含量变化的剂量效应关系。结果显示,在人工土壤试验中,Cu可诱导蚯蚓GSH和MDA含量上升,暴露2 d、7 d、14 d后,Cu浓度与蚯蚓GSH含量的相关系数分别为0.556、0.807和0.775,与MDA含量的相关系数分别为0.760、0.672和0.544,均存在显著的剂量效应关系(p<0.05)。自然土壤试验结果显示,赤子爱胜蚓的GSH和MDA含量与土壤Cu全量的偏相关系数分别为-0.830(p<0.001)和-0.599(p<0.05),与Cd全量的偏相关系数分别为-0.697(p<0.05)和-0.690(p<0.05)。同时发现,赤子爱胜蚓GSH含量变化对土壤重金属响应的敏感性要高于MDA。 相似文献
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矿区复垦土壤碳组分对外源碳输入的响应特征 总被引：1，自引：0，他引：1
研究外源碳输入对复垦土壤有机碳及组分的影响,对于深入探究矿区复垦土壤有机碳提升及培肥管理具有重要意义。本文依托山西省襄垣县采煤沉陷复垦区的长期定位试验,研究了矿区复垦土壤碳组分对不同外源碳(生物炭、堆肥、沼渣、牛粪与秸秆)输入的响应特征。分别在2011年与2016年对矿区复垦土壤样品进行采集,测定0～20 cm土层土壤有机碳、易氧化有机碳、活性碳库Ⅰ、Ⅱ的含量。结果表明,生物炭处理的土壤有机碳增长率和年变化量较对照(CK,无外源碳添加)分别增加101.80%和0.56g·kg–1·a–1,且均显著高于其他有机物料处理;生物炭、牛粪处理土壤0～20 cm土层固碳量较CK分别提高100.52%和91.52%,二者间差异不显著,均显著高于其他有机物料处理,堆肥、沼渣和秸秆处理间对土壤固碳量的提升作用不显著。添加有机物料均能显著增加复垦土壤易氧化有机碳的增长率和年变化量,均表现为堆肥处理最高,较CK分别增加12.37%和0.16 g·kg–1·a–1。复垦土壤活性碳库Ⅰ、Ⅱ的增长率和年变化量均为牛粪处理显著高于其他有机物料处理。有机物料添加均能提高土壤稳定性有机碳含量,与CK相比,生物炭和牛粪处理的提高幅度最大,显著高于其他有机物料,而牛粪与生物碳之间差异不显著。生物炭处理碳库管理指数最高,分别较堆肥、沼渣、牛粪、秸秆处理提高36.30%、52.23%、41.50%、52.02%。施用生物炭、堆肥、沼渣、牛粪与秸秆都能显著提升复垦土壤各碳组分含量和碳库管理指数,施用生物炭的效果最优,因此施用生物炭可作为矿区复垦土壤有机碳提升的有效管理措施。 相似文献
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不同土地利用方式下的蚯蚓种群特征及其与土壤生物肥力的关系 总被引：3，自引：0，他引：3
采用样方法对华北平原(河北曲周)盐渍化改造区7种土地利用方式下的蚯蚓种群进行详细调查,并通过培养实验研究了蚯蚓种群特征对若干土壤生物学指标的影响。结果表明:(1)在7种土地利用调查样地中共存在蚯蚓有3个科,5个属,5个种,其中赤子爱胜蚓(Eisenia fetida)占调查样地总个体数的60%以上,梯形流蚓(Aporrectodea trapezoides)和赤子爱胜蚓两个种在本地区广泛分布,样点出现频率分别为74%和44%,为该地区的优势种;(2)不同土地利用方式的蚯蚓种群密度及生物量变化趋势是:庭院菜地>直立免耕>清茬免耕>商品菜地>传统玉米地>果园>原貌地。其中庭院菜地蚯蚓种群的平均密度和生物量分别达到272 Ind.m-2和68.04gm-2;(3)蚯蚓种群密度和物种数等种群特征与土壤基础呼吸强度、微生物生物量碳含量成显著正相关(p<0.01),与土壤基础呼吸商成显著负相关(p<0.01);(4)不同土地利用方式下,蚯蚓的种群密度、生物量等种群特征对土壤中微生物群落的影响作用显著。蚯蚓生物量越大、种群越丰富的土壤有机质、氮、磷、钾等有效成分越高,反之则相反。室内培养实验表明,随着蚯蚓个体数量增加土壤原生动物总丰度、微生物生物量碳、氮也存在升高的趋势,与用土壤生物学特性指标及土壤化学特性指标评价的结果基本一致。 相似文献
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研究了两种有机肥(腐熟牛粪和烘干鸡粪)作底肥及其与化学氮肥(尿素)配施对黄瓜(CucumissativusL.)日光温室栽培条件下的土壤NO3--N运移特点。结果表明,烘干鸡粪和腐熟牛粪的矿化均可增加温室内土壤NO3--N积累,黄瓜收获后分别比不施肥(对照)增加了118.2%和118.8%(0~30 cm土层);腐熟牛粪和烘干鸡粪与化学氮肥配施后,可使土壤表层(0~30 cm)NO3--N含量分别增加225.5%和321.9%,而使温室深层土壤(60~90 cm)NO3--N含量分别增加167.6%和184.2%,故本试验条件下无论增施腐熟牛粪还是烘干鸡粪作底肥均可显著提高土壤NO3--N积累,进一步追施化学氮肥则使土壤NO3--N积累相应显著提高,而两种有机肥处理之间对温室土壤NO3--N积累的影响无显著差异。 相似文献
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有机物料与化肥配施提高黄泥田水稻产量和土壤肥力 总被引：14，自引：1，他引：13
农业有机物料具有资源化再利用的特点,与化肥配施既可以保证作物产量,也可以提升地力。为了建立最适宜的南方低产黄泥田培肥模式,该文在浙江金衢盆地开展3年田间试验研究化肥与不同有机物料(菇渣、紫云英、牛粪和秸秆)配施对水稻产量和土壤肥力的影响。结果表明:1)有机物料与化肥配施可以显著提高水稻产量,化肥+菇渣、化肥+紫云英、化肥+牛粪和化肥+秸秆处理下,水稻三年的平均产量分别比单施化肥提高了9.7%、9.5%、12.3%和9.5%;2)有机物料与化肥配合施用,土壤有机质、土壤养分(全氮、有效磷、速效钾和CEC)及土壤容重较单施化肥处理有一定程度的改善,其中,化肥+牛粪效果最明显,有机质质量分数提高了12.5%,土壤有效磷质量分数提高了37.7%,CEC提高了16.1%;3)与单施化肥相比,化肥+菇渣、化肥+牛粪处理下5 mm机械稳定性大团聚体分别提高了10.4%和6.7%,各配施处理均显著降低了团聚体破坏率。总得来讲,连续三年有机物料与化肥配施较单施化肥处理提高了水稻产量、改善了土壤肥力状况、增加了土壤团聚体稳定性,其中又以牛粪与化肥配合施用效果最佳。 相似文献
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蚯蚓和发酵牛粪促进南瓜苗修复PAHs污染农田土壤 总被引：1，自引：1，他引：0
为了寻求高效修复土壤中持久性有机污染物多环芳烃(PAHs,polycyclic aromatic hydrocarbon),在温室盆栽试验条件下,研究接种蚯蚓和施用发酵牛粪对南瓜苗修复3环以上PAHs污染土壤的影响。试验设置施用牛粪(D)、单接蚯蚓(E)、接种蚯蚓和施用牛粪(ED)、不接种蚯蚓和不施用牛粪的对照(CK)共4个处理,播种10周后收获。研究结果表明,接种蚯蚓和施用牛粪的共同作用下能有效提高南瓜苗生物量,有利于南瓜苗在PAHs污染的土壤生长,特别是地上部分的生长;接种蚯蚓或/和施用牛粪有效地提高了南瓜苗从土壤中吸收3～5环PAHs化合物的效率,且南瓜苗地上部吸收的PAHs量最低是地下部的6倍。因此,结合蚯蚓和发酵牛粪的辅助作用,南瓜苗地上部生物量较大,能从土壤中吸收多种PAHs化合物,与仅依赖于土壤自身的作用相比,三者的共同作用使得土壤中3环以上PAHs化合物的去除率提高23%以上,可组合应用于PAHs污染土壤的强化修复。该研究为土壤多环芳烃污染修复提供参考。 相似文献
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Abstract. In dairy farming systems the risk of nitrate leaching is increased by mixed rotations (pasture/arable) and the use of organic manure. We investigated the effect of four organic farming systems with different livestock densities and different types of organic manure on crop yields, nitrate leaching and N balance in an organic dairy/crop rotation (barley–grass-clover–grass-clover–barley/pea–winter wheat–fodder beet) from 1994 to 1998. Nitrate concentrations in soil water extracted by ceramic suction cups ranged from below 1 mg NO3-N l?1 in 1st year grass-clover to 20–50 mg NO3-N l?1 in the winter following barley/pea and winter wheat. Peaks of high nitrate concentrations were observed in 2nd year grass-clover, probably due to urination by grazing cattle. Nitrate leaching was affected by climatic conditions (drainage volume), livestock density and time since ploughing in of grass-clover. No difference in nitrate leaching was observed between the use of slurry alone and farmyard manure from deep litter housing in combination with slurry. Increasing the total-N input to the rotation by 40 kg N ha?1 year?1 (from 0.9 to 1.4 livestock units ha?1) only increased leaching by 6 kg NO3-N ha?1. Nitrate leaching was highest in the second winter (after winter wheat) following ploughing in of the grass-clover (61 kg NO3-N ha?1). Leaching losses were lowest in 1st year grass-clover (20 kg NO3-N ha?1). Averaged over the four years, nitrate concentration in drainage water was 57 mg l?1. Minimizing leaching losses requires improved utilization of organic N accumulated in grazed grass-clover pastures. The N balance for the crop rotation as a whole indicated that accumulation of N in soil organic matter in the fields of these systems was small. 相似文献
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《Communications in Soil Science and Plant Analysis》2012,43(1-2):357-367
The decomposition and the associated nitrogen (N) dynamics of organic N sources are affected by their contact with soil. While several authors have examined the effect of surface application or incorporation of crop residues on their decomposition rate, less information is available about the relationship between the placement of animal manure and their N mineralization rate. This study investigated the influence of chicken manure and cattle manure placement on soil N mineralization. The manures were incorporated or surface applied at 175 mg N kg?1, and N release was periodically determined over 56 days by measuring inorganic N [nitrate (NO3 ?) N and ammonium (NH4 +) N] in a 2 M potassium chloride (KCl) extract at a ratio of 1:10 (w/v). Results indicated that the control soil released a maximum of 64 mg N kg?1 soil at day 21, a sixfold increase over the initial concentration, which indicates its substantial mineralization potential. Manure treatments showed an initial increase in net NO3 ?-N content at the start of the experiments (until day 7) before an extended period of immobilization, which ended at day 21 of the incubation. A small but positive net N mineralization of all manures was observed from 28 days of incubation. At each sampling time, the mean mineral N released from the control was significantly less (P < 0.01) than surface-applied chicken manure, incorporated chicken manure, and surface-applied cattle manure. Treatments exceptions were at days 21 and 28 where N immobilization was at its peak. In contrast, incorporation of cattle manure showed a different N-release pattern, whereby the mineral N amount was only significantly greater than the control soil at days 42 and 56 with 84 and 108 mg N kg?1 soil respectively. Incorporation of chicken manure and cattle manure did not favor nitrification as much as surface application and cattle manure caused a much greater immobilization when incorporated than when surface applied. 相似文献
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通过盆栽试验，分析了不同来源有机物料(鸡粪、牛粪、菇渣)对菜用蚕豆生长和品质、根际土化学和生物学性状的影响。结果表明：①3种有机物料对蚕豆分枝数、荚干重、籽粒干重、大粒重、大粒蚕豆占比、籽粒淀粉含量均有积极作用，其中牛粪和菇渣能显著(P<0.05)提高大粒蚕豆占比，鸡粪能显著(P<0.05)提高二粒荚和三粒荚的占比，并且对籽粒淀粉含量的提升效果最为明显(比对照增加69.1%)；②3种有机物料增加了根际土中细菌、真菌数量，显著(P<0.05)提高了根际土中性转化酶、脲酶、酸性磷酸酶、多酚氧化酶活性(除牛粪使中性转化酶活性提高不显著外)，其中鸡粪对细菌数量、中性转化酶活性、脲酶活性的提高程度均最大；③鸡粪能显著(P<0.05)增加根际土有机碳、全氮、NH4+-N含量，牛粪、鸡粪能显著(P<0.05)提高土壤pH。大粒蚕豆占比与土壤酸性磷酸酶活性、有效磷含量呈显著正相关。蚕豆淀粉含量与细菌数量、中性转化酶活性、有机碳、全氮、NH4+-N含量呈显著正相关，这说明有机物料的施用可能为细菌生长提供了更多的碳源和能源，导致细菌数量增加。细菌是酶的重要产生者，细菌数量的增加可能提高了碳氮循环相关酶(中性转化酶、脲酶)的产生量和活性，从而使更多的有机氮转变为无机氮(NH4+-N)，提高了土壤养分(NH4+-N、全氮)水平，进而提高了蚕豆营养品质。 相似文献
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《Communications in Soil Science and Plant Analysis》2012,43(1-2):464-470
Soil temperature is a very easily measured parameter that influences nutrient availability in vineyards. We monitored soil temperature and plant-available nitrogen (N) in a study evaluating the potential of legumes as an interrow cover crop to supply N to Concord grape (Vitis labruscana Baily). Nitrogen sources used were hairy vetch (Vicia villosa subsp. villosa L.) and yellow sweet clover [Melilotus officinalis (L.) Lam] as green manure sources and either blood meal (in a certified organic vineyard) or urea (in a conventional vineyard) as soluble sources. Plant-available N was measured both continuously using ion exchange membranes (PRSTM) and point in time by soil sampling at regular intervals; both were analyzed for nitrate (NO3) N and ammonium (NH4) N, although negligible concentrations of NH4-N were detected. PRS NO3-N concentration varied by treatments because of differences in the chemical composition of the N source. Soil NO3-N concentration reached a peak between 520 and 550 degree-days with no significant differences by treatment or site. These findings are similar to results from incubation and field mineralization studies of organic amendments and suggest that N availability from organic sources in vineyards can be predicted using a degree-day-type model. 相似文献
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A. Elmi A. Madani R. Gordon P. MacDonald G. W. Stratton 《Water, air, and soil pollution》2005,160(1-4):119-132
Nitrate-N (NO3 ?-N) is a ubiquitous pollutant in both surface and groundwater in many agro-ecosystems. This has elicited a concerted effort to identify management strategies that mitigate NO3 ?–N pollution, without compromising crop yield. This study was conducted on a field site located at the Bio-Environmental Engineering Centre (BEEC) in Truro, NS, Canada during 1999 and 2000. The site has been used since 1997 to investigate the relative effect of inorganic versus organic fertilizer (liquid hog manure; LHM) applied at rates (70 kg N ha?1) on NO3 ?-N leaching from a carrot rotation system. NO3 ?-N concentrations were monitored in both the soil profile and in tile drainage effluents from eight treatment plots. The LHM treatment elicited significantly (P < 0.01) higher soil NO3 ?-N concentrations than inorganic fertilizer (IF) in June and October during 1999, but not 2000. The sampling date and soil depth were significant in most cases. Annual flow weighted averages (FWA) of NO3 ?-N in drainage water were generally greater for plots receiving LHM (15.4 and 10.5 mg L?1 for 1999 and 2000, respectively), when compared to IF (8.9 and 6.0 mg L?1 for 1999 and 2000, respectively), but the difference was significant (P < 0.05) only in 1999. Maximum NO3 ?-N concentrations in drainage water were similar for both treatments, while the LHM treatment had a significantly higher percentage of samples that were > 10 mg L?1. The total NO3 ?-N load was greater for the LHM treatment when compared to the IF treatment in 1999. Barley and carrot yields were unaffected by treatment applications. 相似文献
16.
The aim of this work was to assess and compare the influence of Eisenia foetida Savigny earthworms on C mineralization rate, labile C fractions (water-soluble C and water-soluble carbohydrates), microbial biomass C, and enzyme activities (dehydrogenase, urease, phosphatase and ß-glucosidase) in three soils of varying texture treated with a composted organic residue and cropped with Avena sativa L. Mineralization decreased with the addition of earthworms to the sandy and clay-loam soils, especially in sandy soil (by about 4 µg CO 2-C g -1 day -1). There were no significant effects on the amount of CO 2 evolved from clay soil due to the addition of E. foetida. The addition of E. foetida to sandy soil significantly decreased microbial biomass C and increased microbial metabolic quotient the qCO 2 (CO 2-C to biomass C ratio). The addition of E. foetida did not affect the microbial biomass or the qCO 2 of the clay-loam and clay soils. 相似文献
17.
《Communications in Soil Science and Plant Analysis》2012,43(7):790-802
A field experiment was conducted to determine the effects of long-term applications of fertilizers and manure (1982 to 2003) and short-term irrigation level (2002 and 2003) on accumulation of nitrate nitrogen (NO3-N) in soil at Zhangye Oasis, China. The treatments included manure (M) and no manure (M0) as main plots; check (Ck), nitrogen (N), nitrogen + phosphorus (NP), and nitrogen + phosphorus + potassium (NPK) as subplots; and two amounts of irrigation (I1 and I2) as subsubplots. The application of N alone resulted in large NO3-N accumulation in soil, accounting for 6% of the applied N, and the lowest crop N recovery. Application of manure resulted in increased NO3-N in the soil profile compared to treatment with no manure, and the MN treatment resulted in the greatest amount of NO3-N in soil. Nitrogen applied with P and/or K reduced the amount of NO3-N in soil in both manure and no-manure treatments compared with N only. The unaccounted N was greatest (60%) in the N-alone treatment and lowest (30%) in the NPK treatment. When manure plus fertilizer were applied together, the unaccounted N ranged from 35%–42%. Based on results from only 2 years, greater amounts of irrigation (I2) caused greater leaching of NO3-N in the soil profile compared with I1, especially in treatments receiving manure. The implications of these findings are that these high amounts of accumulated NO3-N in surface and subsoil layers can be a potential threat to surface water, underground water, and air quality in the long run. This accumulated N in the soil profile can be used as a source of available N for future crops and should be recycled by using proper crop, soil, fertilizer, and water-management strategies/practices. The findings also suggest the need for further research to make an effective and efficient use of this accumulated NO3-N in the soil profile in order to save cost of N fertilizer application to future crops. 相似文献
18.
Nitrate determination in leachates from farmyard manure by UV absorption A simple, sufficiently sensitive (< 1 ppm NO3?-N) method for nitrate determination in leachates from farmyard manure is described, suitable for routine analysis. The well known determination by UV absorption is preceded by a precipitation of organic matter with ZnSO4BO7. By this, average NO3?-N contents of 48.7 ppm were detected in leachates from cattle manure heaps (n = 54). 相似文献
19.
《Communications in Soil Science and Plant Analysis》2012,43(17):2274-2288
Two field experiments were conducted to evaluate the use of relative chlorophyll content (RCC) in sweet corn leaves as an indicator of nitrate concentration in soil. Study objectives were (1) to evaluate the effect of manure types (chicken and dairy), rates (0, 168, 336, and 672 kg ha?1 equivalent N), and application frequency (one and two applications) of organic amendments on (a) nitrate nitrogen (NO3-N) concentration within and below the crop root zone and (b) the RCC of sweet corn leaves and (2) to quantify the relationship between RCC and NO3-N concentrations. The results showed a significant increase in NO3-N concentrations within and below the root zone and plant leaf RCC under chicken manure treatments. Manure application rates and frequency had a significant effect on both NO3-N concentration within and below the root zone and leaf RCC. It appears that leaf RCC can be used as an indicator of NO3-N availability for sweet corn cultivated under the study conditions. 相似文献
20.
Nutrient cycling and greenhouse gas emissions from soil amended with biochar-manure mixtures 总被引：1，自引：0，他引：1
Carlos M. ROMERO Chunli LI Jen OWENS Gabriel O. RIBEIRO Tim A. MCALLISTER Erasmus OKINE Xiying HAO 《土壤圈》2021,31(2):289-302
Integrating biochar into cattle diets has recently emerged as a potential management practice for improving on-farm productivity.Yet,information concerning the cycling of biochar-manure mixtures is scarce.A 70-d incubation experiment was conducted within two surface(0–15 cm)Mollisols with contrasting textures,i.e.,sandy clay loam(Raymond)and clayey(Lethbridge),to evaluate the effects of biochar(3 Mg ha-1)on cumulative greenhouse gas(GHG)emissions and related fertility attributes in the presence or absence of cattle manure(120 Mg ha-1).Five treatments were included:i)non-amended soil(control,CK),ii)soil amended with pinewood biochar(B),iii)soil amended with beef cattle manure(M)(manure from cattle on a control diet),iv)soil amended with biochar-manure(BM)(manure from cattle on a control diet,with pinewood biochar added at 20 g kg-1of diet dry matter),and v)soil amended with B and M at the aforementioned rates(B+M).A total of 40 soil columns were prepared and incubated at 21℃and 60%–80%water-holding capacity.On average,total CO2fluxes increased by 2.2-and 3.8-fold under manure treatments(i.e.,M,BM,and B+M),within Raymond and Lethbridge soils,respectively,relative to CK and B.Similarly,total CH4 fluxes were the highest(P<0.05)in Raymond soil under B+M and BM relative to CK and B,and in Lethbridge soil under M and BM relative to CK and B.In Lethbridge soil,application of BM increased cumulative N2O emissions by 1.8-fold relative to CK.After 70-d incubation,amendment with BM increased(P<0.05)PO_4-P and NO_3-N+NH_4-N availability in Raymond and Lethbridge soils compared with B.A similar pattern was observed for water-extractable organic carbon in both soils,with BM augmenting(P<0.05)the occurrence of labile carbon over CK and B.It can be concluded that biochar,manure,and/or biochar-manure have contrasting short-term effects on the biogeochemistry of Mollisols.At relatively low application rates,biochar does not necessarily counterbalance manure-derived inputs.Although BM did not mitigate the flux of GHGs over M,biochar-manure has the potential to recycle soil nutrients in semiarid drylands. 相似文献