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1.
塔里木河中游荒漠河岸林土壤理化性质分布特征与植被关系 总被引：5，自引：0，他引：5
为揭示土壤理化性质的空间变异特征及其与植物数量特征、物种多样性的关系,运用相关性分析和回归分析等方法对塔里木河中游荒漠河岸林不同生境土壤理化性质的空间变异规律及其与植物数量特征和物种多样性进行了分析。结果表明:(1)不同生境土壤理化性质有明显的差异,表现为:土壤含水量、容重在河岸地带大于过渡地带和荒漠地带,持水量、孔隙度、全盐、pH值则随着垂直于河岸距离的增加而增加,有机质、全磷、全钾的最大值则出现在水热资源组合较好的过渡地带,生境内部不同土层理化因子变化呈现不同的规律;(2)随着距离河岸增加,乔木、灌木、草本的频度、盖度、密度存在不同程度退化,物种多样性指数也明显降低;(3)植物数量特征、物种多样性指数与土壤理化因子存在一定的相关性,全盐量、容重、土壤含水量、pH、全氮、全磷与植物的数量特征指标和物种多样性指数的关系最为密切;(4)经回归分析,表明土壤含水量是影响干旱地区植物生长的首要因子,而土壤养分也是影响植物生长的主要因素,且有机质、全磷、全钾与植物生长状况呈负相关。土壤理化性质的空间变异不仅促使区域植物数量特征发生明显变化,而且也影响群落的演替,同时,植物的空间分布特征对土壤理化性质有明显改良作用,通过二者关系的研究为塔里木河中游荒漠河岸林的恢复和土地沙化的治理提供理论支撑。 相似文献
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以西南喀斯特典型石漠化生态系统土壤为研究对象,采用空间替代时间的方法,研究石漠化演替过程中土壤表面电化学特征演变规律及其与土壤理化性质的相关性。采用物质表面联合分析法对不同石漠化等级土壤表面电化学属性及进行测定。结果表明,土壤表面电荷密度、表面电场强度、比表面、表面电荷数量随石漠化强度的增加而下降,其变化范围分别为0.34 C·m-2~0.42 C·m-2、4.85×108 V·m-1~5.86×108 V·m-1、47.11 m2·g-1~53.16 m2·g-1、16.86 cmol·kg-1~22.82 cmol·kg-1,土壤表面电位随石漠化强度的增加而上升,其变化范围为-113.74 mV~ -115.10 mV;研究区黏土矿物组成为伊利石、高岭石、绿泥石、伊蒙混层、绿蒙混层,且以绿蒙混层为主;土壤黏粒、砂粒、非晶质氧化铝、胡敏酸是影响喀斯特石漠化地区土壤表面电化学属性变化的主要因素,解释率分别为48.3%、38.1%、13.0%、12.0%;土壤粒径组成、有机质组分和金属氧化物对土壤表面电化学特征影响由强到弱依次分别为：土壤黏粒>砂粒>粉粒,胡敏酸>有机碳>富里酸,非晶质氧化铝>游离氧化铁>非晶质氧化铁。本研究对中国西南喀斯特石漠化土壤管理与调控、退化植被恢复重建具有重要意义。 相似文献
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为探寻矿山废弃地植被恢复过程中植被和土壤的演替规律及物种多样性与土壤因子间的关系,以福建紫金山金尾矿废弃地为研究对象,采用空间代替时间序列的方法,对不同植被恢复阶段植物群落的物种多样性和土壤理化性质进行调查研究,并与未被破坏的自然植物群落和植被恢复前的裸尾矿进行比较分析。结果表明:(1)植被恢复能有效提高群落物种多样性,且随群落演替的进行呈上升趋势,不同植被恢复阶段的群落乔木层物种多样性明显低于灌木层和草本层,物种α多样性指数呈现相似的变化趋势;(2)植被恢复能有效改善土壤理化性质,不同植被恢复阶段的土壤容重和pH值随着恢复年限的增加而降低,土壤持水量和孔隙度逐渐提升,最大持水量和总孔隙度在恢复到11a时达到最大,相对于裸尾矿分别提高了112.91%和95.31%,有机质含量显著提高,是裸尾矿的1.99~23.30倍,养分含量逐渐增大,其中全磷和速效磷含量呈现先增加后降低的变化趋势;(3)相关性分析结果表明:植被恢复过程中物种多样性与土壤理化因子间具有明显的相关性,物种多样性与土壤养分含量呈现相似的变化趋势,植被的恢复不断改善着土壤理化性质,土壤肥力不断提高,而土壤理化性质的改善又促进了植物群落的发育和恢复发展。 相似文献
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明确贵州喀斯特地区不同石漠化等级土壤养分状况,为石漠化防治和生态系统恢复提供参考。收集公开发表的涉及贵州不同石漠化等级土壤养分的研究论文,对有关数据进行整理和分析。研究发现:(1)随石漠化等级增加,土壤容重不断增加,0.001 mm黏粒含量有下降趋势,0.05 mm砂粒含量则有增加趋势,但不同石漠化等级之间黏粒和砂粒含量均无显著差异;(2)土壤有机质、全氮、全磷、速效养分含量均表现为无石漠化(ND)轻度石漠化(LD)中度石漠化(MD)重度石漠化(SD),随石漠化等级增加呈幂函数下降,衰减速度为有机质有效磷碱解氮全氮速效钾全磷,从无石漠化到轻度石漠化演替过程土壤养分下降幅度最大;(3)土壤有机质和全氮与其他土壤理化指标之间极显著相关,且对石漠化地区土壤肥力贡献极大,可作为表征土壤-石漠化关系的敏感性土壤指示因子;(4)不同土地利用方式对石漠化地区土壤养分影响明显,土壤养分高低为林地草地耕地。土壤养分和地表植物群落结构与石漠化演替进程密切相关,贵州喀斯特石漠化地区增加地表覆盖度和开展有机培肥对防止土壤退化和石漠化生态恢复具有重要意义。 相似文献
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石漠化综合治理对喀斯特高原山地土壤生态系统的影响 总被引：1，自引：0，他引：1
为研究石漠化综合治理对喀斯特高原山地土壤生态系统的影响,以贵州省毕节鸭池示范区石桥小流域为例,结合石漠化综合治理工作的开展,对小流域内的土壤侵蚀状况、土壤理化性质和土壤呼吸强度等进行动态监测,探讨土壤生态系统的演变规律。结果表明:通过采取一系列的生物工程措施,小流域内土壤侵蚀得到控制,各种水土保持措施减沙效果明显,从而减少负熵的输出,使系统向"有序"状态发展;通过对不同等级石漠化土壤有机质及C/N比值的研究,得出土壤有机质与全氮含量呈显著相关性(P<0.01),随着石漠化综合治理的开展,土壤肥力结构得到优化;土壤呼吸强度在某种程度上也可以作为反映石漠化综合治理综合效应的间接指标,但这种相关性还有待进一步论证。通过以上研究旨在提高生态监测整体能力,为喀斯特石漠化综合治理提供决策支持。 相似文献
6.
鄂北不同程度石漠化环境植物多样性与土壤物理性质 总被引：1，自引：0，他引：1
《水土保持研究》2020,(6)
为了探析鄂北石漠化地区植被与土壤相关性,为区域石漠化综合治理提供参考,以鄂北岩溶石漠化生态系统为对象,采用野外定点样地监测调查及室内分析相结合的方法,研究了区域性不同程度石漠化环境中植物多样性与土壤物理性质及相关性。结果表明:鄂北岩溶石漠化地区植被结构简单,群落空间结构、植物组成、植物多样性随石漠化程度增强而递减,强度石漠化植物仅有13科18属18种;石漠化程度越高,植物形态特征越相近,以铁仔、黄栌及忍冬科、豆科的带刺植被为主;石漠化土壤物理结构随石漠化等级呈退化趋势,而持水性能则是先退化后趋于稳定;环境土壤的容重、干密度、孔隙度与植物多样性显著相关,其中非毛管孔隙度同丰富度、植物多样性呈显著正相关,均匀度指数与毛管孔隙度呈显著正相关;总孔隙度、均匀度、多样性、丰富度、毛管孔隙度是基于植物多样性和土壤物理性质评价石漠化的关键指标。 相似文献
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8.
为揭示造林20年后不同石漠化恢复模式对土壤结构和理化性质的影响,以滇中地区7种恢复模式下样地土壤为研究对象,研究不同石漠化恢复模式下土壤理化性质分布特征并进行多指标聚类分析。结果表明：除油杉林外,其他样地土壤养分等级均为中高级;土壤颗粒组成较为合理,分形程度较好,抵抗侵蚀的能力较强;不同恢复类型对石漠化土壤的改良存在明显不同,混交林明显优于纯林;由于受土壤母质、地形以及水文等因素的影响,相同恢复类型间存在差异,华山松林和油杉林总体较差;研究区土壤可蚀性因子K值与粉粒含量呈正向变化特征;对土壤理化性质进行Q型聚类可以将受试样地土壤分为4类,油杉林和华山松林被单独分出。研究结果可为地方政府制定科学合理的喀斯特石漠化地区生态防治措施提供理论基础和技术支撑。 相似文献
9.
中国西南喀斯特土壤水分特征研究进展 总被引：12，自引：0，他引：12
喀斯特土壤水分是岩溶植被的生命线、岩溶作用的驱动力和土壤流失的重要影响因子,关系岩溶区生态地质环境安全和社会经济发展。现有研究表明:中国西南喀斯特土壤水分含量差异大,土壤水分含量森林>灌丛>草地,阔叶林>针叶林,天然林>人工林;土壤水分含量空间分布呈斑块状,具有变异性和相关性,坡面分布复杂;含水量随土壤深度增加而增加,随季节演替呈低—升—高—降变化,干湿季差异大,日变化表现为从早到晚先降后升;土石相间分布、土下裂隙发育的小生境差异是喀斯特土壤水分空间差异大、坡位变化异常的重要原因。今后的研究重点是:喀斯特土壤水分的理化性质,土壤储水库的动态特征、适度水分、干季保水补水工程技术和湿季土壤无流失排水工程技术,对全球变化的响应,滇东高原喀斯特区土壤水分的相关研究等。 相似文献
10.
为了探讨喀斯特区土石混合工程堆积体植被恢复过程中物种多样性与土壤理化性状的互作关系,以不同恢复时段恢复时间(1,2,4,6 a)依坡倾倒型工程堆积体为研究对象,采用“空间代替时间”的研究方法,研究了不同恢复时间土壤理化性状和植物物种多样性的特征及相互之间的响应机制。结果表明:随恢复时间增加,土石混合堆积体台面和坡面植物种类呈现先上升后下降的趋势,且坡面植物种类(99种)多于台面(74种),植物群落逐渐由草本向草灌混交转变。台面和坡面的物种丰富度、多样性、优势度和均匀度指数随恢复年限恢复时间增加均表现为先增加后减小。随植被恢复时间增加,土壤理化性质得到不同程度的改善,其中土壤全氮(TN),全磷(TK),速效磷(AP)和有机质(SOM)含量显著增加,土壤养分含量呈上升趋势,坡面土壤理化性质优于台面。冗余分析(RDA)表明,土壤含水量(MC),容重(BD),TN,TK和速效钾(AK)在不同恢复时段恢复时间内对植物物种多样性有较大影响;钾素在较短的恢复时间内对物种多样性影响较大,氮素随恢复时间延长影响逐渐增加,MC和BD对台面物种多样性的影响大于坡面,而土壤养分因子对坡面影响较大。因此对土石混合堆积体进行植被恢复时,恢复前期采取添加覆盖物等措施减少水分流失的同时施用钾肥尽量保证植物存活,植物物种种类上选择既能保水保土又能与土壤微生物相互作用补充土壤中营养元素的豆科类植物。 相似文献
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【目的】以富士（Fuji）、 秦冠（Qinguan）嫁接在平邑甜茶（Malus hupehensis Rehd.）上的当年生盆栽苗为试验材料,采用砂培方法,研究了缺氮胁迫和干旱对富士和秦冠生长情况、 光合参数、 植株各部位氮磷钾含量及氮素利用效率的影响,分析比较了低氮干旱条件下富士和秦冠生长及氮素利用的差异,以期为果树生产高效肥水利用提供理论指导。【方法】试验共设四个处理: 正常氮正常水（ZZ）、 低氮正常水（DZ）、 正常氮干旱（ZG）、 低氮干旱（DG）。氮素和水分均设置两个水平,分别为正常氮（6 mmol/L NO-3-N）、 低氮（0.3 mmol/LNO-3-N）、 正常供水（保持盆中砂子相对含水量为饱和含水量的80%~85%）、 干旱处理（保持盆中砂子相对含水量为饱和含水量的60%~65%）。【结果】富士和秦冠的生物量（茎和叶）、 株高茎粗等生长指标以及光合速率、 气孔导度、 蒸腾速率均为正常氮正常水（ZZ）＞低氮正常水（DZ）＞正常氮干旱（ZG）＞低氮干旱（DG）,并且相对应处理下秦冠的以上指标均高于富士;正常供水下,缺氮处理使富士、 秦冠的根冠比比正常氮处理均有所增加,富士提高了2.05%,秦冠提高了22.40%。富士和秦冠的氮、 磷、 钾含量均表现出正常氮正常水（ZZ）＞低氮正常水（DZ）＞正常氮干旱（ZG）＞低氮干旱（DG）; 氮、 钾元素含量在植株各部位的分布顺序依次是叶＞根＞茎,磷元素则是根＞叶＞茎;光合氮素利用效率（PNUE）和氮素利用效率表现为秦冠处理之间差异极显著,富士处理之间差异不显著;秦冠的PNUE和NUE明显高于富士,在低氮正常水（DZ）处理下,秦冠氮肥利用率比富士高42.07%,在低氮干旱（DG）处理下高64.14%;低氮胁迫下富士和秦冠的NUE显著提高,并且秦冠提高的幅度高于富士。【结论】施用氮肥能够显著提高富士与秦冠的干物质量,同等水肥条件下,秦冠生长优于富士;水分亏缺会减少叶片对氮的吸收,干旱条件下适度增施氮肥,可提高果树的抗旱能力;低氮干旱胁迫下秦冠的生长指标、 光合指标及氮素利用效率指标均优于富士,表现出较强的抗低氮干旱胁迫的能力。 相似文献
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Kyle Devey Michael Mucalo Gordon Rajendram Joseph Lane 《Communications in Soil Science and Plant Analysis》2015,46(4):72-80
Laser-induced breakdown spectroscopy (LIBS) is a new technique for the analysis of plant material. This study investigates the application of LIBS to pasture-based plant samples. The LIBS measurements were obtained from pelletized pasture samples (100 samples) that had been also analyzed by inductively coupled plasma–optical emission spectroscopy (ICP-OES) following microwave digestion for calibration and comparison purposes. Comparisons for elements sodium (Na), potassium (K), magnesium (Mg), calcium (Ca), manganese (Mn), iron (Fe), copper (Cu), zinc (Zn), boron (B), phosphorus (P), and sulfur (S) showed that LIBS could be used for almost all the standard profile total elements with concentrations down to low mg/kg levels (observed error of Na: 0.024 percent, K: 0.18 percent, Mg: 0.016 percent, Ca: 0.073 percent, P: 0.017 percent, Mn: 31 mg/kg, Fe: 150 mg/kg, Zn: 6.6 mg/kg, and B: 1.1 mg/kg). Elemental analysis at less than mg/kg levels was not possible using LIBS. The elements S and Cu were particularly difficult to analyze with reliability using LIBS at the concentration levels found in the plant samples. Replacing microwave digestion and subsequent ICP analysis with a direct analysis of dried plant samples using LIBS has the potential to improve the productivity and reduce the cost of testing. 相似文献
13.
《中国生态农业学报》2014,(8)
正The Center for Agricultural Resources Research(CARR),the Institute of Genetics and Developmental Biology(IGDB),Chinese Academy of Sciences,invites applicants for several research group leader positions.CARR is one of the research organizations in Chinese Academy of Sciences(CAS).We seek nominations and applications from individuals who have expertise and a record of accomplishment in research areas related to ecology,agro-hydrology, 相似文献
14.
M.A. Callaham Jr. J.M. BlairT.C. Todd D.J. KitchenM.R. Whiles 《Soil biology & biochemistry》2003,35(8):1079-1093
The responses of tallgrass prairie plant communities and ecosystem processes to fire and grazing are well characterized. However, responses of invertebrate consumer groups, and particularly soil-dwelling organisms, to these disturbances are not well known. At Konza Prairie Biological Station, we sampled soil macroinvertebrates in 1994 and 1999 as part of a long-term experiment designed to examine the effects and interactions of annual fire, mowing, and fertilization (N and P) on prairie soil communities and processes. For nearly all taxa, in both years, responses were characterized by significant treatment interactions, but some general patterns were evident. Introduced European earthworms (Aporrectodea spp. and Octolasion spp.) were most abundant in plots where fire was excluded, and the proportion of the total earthworm community consisting of introduced earthworms was greater in unburned, unmowed, and fertilized plots. Nymphs of two Cicada genera were collected (Cicadetta spp. and Tibicen spp.). Cicadetta nymphs were more abundant in burned plots, but mowing reduced their abundance. Tibicen nymphs were collected almost exclusively from unburned plots. Treatment effects on herbivorous beetle larvae (Scarabaeidae, Elateridae, and Curculionidae) were variable, but nutrient additions (N or P) usually resulted in greater densities, whereas mowing usually resulted in lower densities. Our results suggest that departures from historical disturbance regimes (i.e. frequent fire and grazing) may render soils more susceptible to increased numbers of European earthworms, and that interactions between fire, aboveground biomass removal, and vegetation responses affect the structure and composition of invertebrate communities in tallgrass prairie soils. 相似文献
15.
Grete Skrede Berit Karoline Martinsen Anne-Berit Wold Stein-Erik Birkeland Kjersti Aaby 《Acta Agriculturae Scandinavica, Section B - Plant Soil Science》2013,63(3):193-208
Abstract A 3-year study was carried out to investigate quality parameters in 14 tree fruit and berry species grown in southern Norway. The species were blueberry, apple, aronia, sour cherry, sweet cherry, red raspberry, strawberry, blackcurrant, gooseberry, red currant and elderberry, harvested along with wild bilberry, cloudberry and lingonberry. Significant differences between species were identified for all quality parameters. The coefficient of variation between species was lowest for pH (12.5%), dry matter (18.9%) and soluble solids (25.3%), followed by titratable acids (59.3%), total phenolics (83.8%), antioxidant capacity FRAP (85.7%) and antiradical power by the DPPH-assay (97.8%), total monomeric anthocyanins (132%) and ascorbic acid (137%). Average coefficient of variation within species were lower and ranged from 4 (pH) to 62% (ascorbic acid). Only the FRAP values were significantly affected by harvesting year with lower levels in 2004 than in 2005 and 2006. There were significant interactions between species and harvesting year for dry matter, soluble solids, pH, ascorbic acid and FRAP. The results indicate generic ranges in composition within species independent upon growing location and climate, and the composition of the tree fruits and berries is not likely to deviate from these ranges. It is concluded that desirable composition of tree fruits and berries and their products should primarily be achieved by selection among species rather than searching fors broadened variation within individual species. 相似文献
16.
《Communications in Soil Science and Plant Analysis》2012,43(7):865-877
Potassium (K) fixation and release in soil are important factors in the long-term sustainability of a cropping system. Changes in K concentration and characteristics of K fixation and release in rhizosphere and nonrhizosphere soils in the rapeseed (Brassica napus L.)–rice (Oryza sativa L.) rotation were investigated using a rhizobox system. The concentrations of different forms of K in both rhizosphere and nonrhizosphere soils decreased with plants compared to without plants, regardless of K fertilizer application. Potassium uptake by crops mainly came from the rhizosphere soil. In the treatment without K fertilizer (–K), the main form of K supplied by the soil to the crops was 1.0 mol L?1 nitric acid (HNO3) nonextractable K, followed by nonexchangeable K, and then exchangeable K. In the treatment with K fertilizer (+K), the main K forms supplied by the soil to the crops were exchangeable K and nonexchangeable K. The amount and rate of K fixation after one cycle of the rapeseed–rice rotation was greater in rhizosphere soil than in nonrhizosphere soil. The amount and rate of K fixation of soil in the +K treatment were significantly less than in the –K treatment. The cumulative amounts of K released with 1.0 mol L?1 ammonium acetate (NH4OAc) and 1.0 mol L?1 HNO3 extraction increased with the increasing numbers of extractions, but the K-releasing power of soil by successive extraction decreased gradually and finally became almost constant. The release of K was less in rhizosphere soil than in nonrhizosphere soil. The release of K in the +K treatment was similar to that in the –K treatment in rhizosphere soil, but the K release in nonrhizosphere soil was greater with the +K than the –K treatment. Overall, the information obtained in this study will be helpful in formulating more precise K fertilizer recommendations for certain soils. 相似文献
17.
Aleš Lebeda Ivana Doležalová Eva Křístková Barbora Mieslerová 《Genetic Resources and Crop Evolution》2001,48(2):153-164
Staff members of the Department of Botany of Palacký University in Olomouc and Gene Bank Department – Workplace Olomouc, Research Institute of Crop Production in Prague, Czech Republic, conducted an expedition in seven European countries (Austria, Czech Republic, France, Germany, Italy, the Netherlands, Switzerland) in August/September 1999 to collect wild Lactuca spp. germplasm and study its geographic distribution, ecology and biodiversity. During the mission, more than 600 locations were visited resulting in the collection of 602 seed samples (accessions) of wild Lactuca species and 13 seed samples of related genera (Chondrilla and Mycelis). Lactuca serriola f. serriola, L. serriola f. integrifolia, L. saligna and L. viminea subsp. chondrilliflora were prevalent in southern Europe (Italy, France), however, only L. serriola was common in central and western Europe (Austria, Czech Republic, Germany, Netherlands, Switzerland). The greatest diversity of Lactuca species was found in France, where also the most seed samples (165) were collected. The most characteristic habitats with a high density of Lactuca spp. populations were observed along roads and highways, grassy ditches, ruderal communities, and dust-heaps. Natural infections by powdery mildew (Erysiphe cichoracearum) and downy mildew (Bremia lactucae) on some wild Lactuca spp. were observed. Recent observations concerning the geographic distribution, population structure, habitats, and natural occurrence of diseases of Lactuca spp. are discussed. This assemblage of genetic resources of Lactuca spp. can serve as the basis of future studies of species diversification, spatial population structure, plant microevolution, domestication processes, and genetic variability of host-parasite interactions. 相似文献
18.
Y. Bashan J. J. Bustillos L. A. Leyva J.-P. Hernandez M. Bacilio 《Biology and Fertility of Soils》2006,42(4):279-285
Inoculation of wheat seedlings with the plant growth-promoting bacterium Azospirillum brasilense Cd was immobilized in alginate microbeads and, without applying any stress, significantly increased the quantity of several
photosynthetic pigments, such as chlorophyll a, chlorophyll b, and the auxiliary photoprotective pigments violaxanthin, zeaxanthin, antheroxanthin, lutein, neoxanthin, and β-carotene.
This resulted in greener plants with no apparent visible stress. After monitoring the quantity of photosynthetic pigments
for 4 weeks, we observed that inoculated plants had higher quantities of pigments in shoot and stem. The greatest difference
in the quantity of all pigments between inoculated and noninoculated plants occurred in the first week of growth. Regardless
of treatment, the quantity of pigments in stems was three to four times less than the quantity of these pigments in shoots.
Application of Azospirillum, either as liquid inoculant or as alginate microbeads, did not alter the positive effect of the bacteria on pigment production
or the positive response of the plants towards A. brasilense Cd inoculation. 相似文献
19.
Dhritiman Ghosh Velusamy Srinivasan Olli H. Tuovinen Aaron Peacock Mark Radosevich 《Soil biology & biochemistry》2009,41(6):1331-1334
We examined the community composition of microbes that colonized atrazine-containing beads buried in agricultural soils that differed in atrazine treatment history. Bacterial abundance was 5-40-fold greater in atrazine-fortified beads. In beads containing 20 mg atrazine kg−1 buried in soil with a history of atrazine application (conditioned soil), the abundance of Actinobacteria increased approximately 80-fold whereas in control soil, Actinobacteria were enriched only 10-fold and the gamma-Proteobacteria and Planctomycetes increased by 60- and 25-fold, respectively. The gamma-Proteobacteria were enriched by 120- and 230-fold in beads containing 200 mg atrazine kg−1 in conditioned and control soil, respectively. The results demonstrate that BioSep® beads are a suitable matrix for recruiting a diverse subset of the bacterial community involved in atrazine degradation. 相似文献
20.
Thomas Larsen Jesper Luxhøi Jakob Magid Lars Stoumann Jensen Paul Henning Krogh 《Biology and Fertility of Soils》2007,44(1):59-68
We have studied the effect of anaerobically digested (ADMSW) and composted municipal solid waste (CMSW) on mineralization
and foodweb dynamics to verify the hypothesis that ADMSW would immobilize N right after addition to soil in contrast to addition
with CMSW. Another hypothesis was that the mesofauna (enchytraeids and microarthropods) would stimulate N release from the
decomposer community. We measured excretion of -N and urea-N from the mesofauna and hypothesized that enchytraeids would release urea. ADMSW and CMSW were amended to pots
with sandy loam and barley. The pots were divided into treatments with or without mesofauna. Mesofauna, plant N and biomass,
soil N and ergosterol (fungal biomass) were measured over a 113-day period of four equidistant samplings. Soil respiration,
N mineralization and N release by the mesofauna were modelled from concurrent studies. ADMSW- and CMSW-treated soils initially
(<20 days) immobilized N. The amendments did not increase plant growth substantially, and this was probably due to N-limitation
in the early stages of plant growth. Enchytraeid abundance was about three times higher in ADMSW- than CMSW-treated soils,
indicating that ADMSW contained more labile compounds, bacteria, and microfauna. The mesofauna did not affect N-content, but
the cumulated -N excreted by the mesofauna was estimated to be substantial and about one-fifth of total plant N in ADMSW. An explanation
for this discrepancy might be that in the absence of the mesofauna, other members of the detrivore and microbivore community
performed the mesofauna’s function. Neither enchytraeids nor microarthropods excreted urea. 相似文献