Moderately resistant phosphorus forms in subtropical ultisol of Argentina

Abstract

The efficiency of phosphorus (P) fertilization may be improved through knowledge of soil P fraction changes with time. This study examined: i) the distribution of P fractions according to Hedley's fractionation scheme and ii) the sequential changes in soil organic P (OP) and inorganic P (IP) in a typical Kandihumult, under favorable conditions for mineralization and under depletion conditions, with and without P fertilization. Soil P fractions considered were IP‐resin, IP‐ and OP‐bicarbonate, and IP‐ and OP‐hydroxide. The soil is characterized by the predominance of moderately resistant P, in organic and inorganic fractions. In the presence of favorable conditions for mineralization, a substantial decrease in moderately resistant organic P was observed, enhanced even more by fertilizer incorporation. The decrease of total extracted P (TPe) before depletion situations was mainly produced in the moderately resistant fraction, that registered a decrease of 23% (of this value 65% were due to OP). The main fate of the fertilization, in both situations (active mineralization as well as depletion) was moderately resistant inorganic phosphate.     

芦苇根际土壤有机磷组分的季节变化及与磷酸酶活性的关系

通过野鸭湖湿地一年实验研究了芦苇根际土壤中各组分有机磷含量随植物生长的变化规律,分析了不同有机磷组分与磷酸单酯酶、磷酸二酯酶活性间的关系。结果表明:有机磷含量分布为活性有机磷(L-OP)中活性有机磷(ML-OP)中稳定性有机磷(MR-OP)高稳定性有机磷(HR-OP),各组分含量均随芦苇生长先降低后升高。在芦苇对养分需求最大的旺盛生长期,L-OP、ML-OP含量达到最低值,分别为2.46、3.27 mg/kg;在此阶段,MR-OP、HR-OP含量也有所降低。在有机磷矿化过程中,HR-OP一定程度上可转化为ML-OP,ML-OP与MR-OP主要转化为L-OP。磷酸单酯酶与磷酸二酯酶活性均随芦苇生长先降低后升高,在其旺盛生长期达到最低值,分别为Ph OH 0.37 mg/(g·h)和PN 62?g/(g·h)。磷酸酶活性均与L-OP、ML-OP、HR-OP含量呈极显著或显著正相关,活性磷含量的高低对磷酸酶活性有明显的影响作用,两种磷酸酶在一定程度上也可水解转化稳定性高的有机磷组分。衰亡期的芦苇,其衰败的老根及脱落物可间接促进磷酸酶活性。     

连环湖敖包泡沉积物磷形态垂向分布特征

应用SMT连续提取法对连环湖敖包泡北部(AB1)和南部(AB2)柱状沉积岩芯中磷形态的含量和垂向分布特征进行对比分析,结合沉积岩芯年代测定,探讨了该湖区沉积物中磷的演化特征与人为污染历史以及内源磷的释放风险。结果表明,AB1、AB2沉积物中磷形态的含量和垂向变化不同,AB1沉积物中各形态磷含量均高于AB2,且随深度变化波动较大。20世纪40年代中期至1981年,AB1沉积物各形态磷和OM含量波动较大;AB2沉积物中Ca-P、IP、TP含量呈先增加后减少之势,Fe/Al-P、OP、OM含量变化较稳定。1981—2009年,AB1沉积物Ca-P、IP、OM含量变化较小,Fe/Al-P、OP、TP含量相对波动较大;AB2沉积物Ca-P、Fe/Al-P、TP含量不同程度上先增加后减少,IP、OP、OM含量变化均呈增加趋势。连环湖敖包泡沉积物磷人为来源以工业废水、居民生活污水和农药化肥的流失为主。湖泊北部磷含量高于南部,这与人类活动强度密切相关,敖包泡北部附近村落密集而南部没有村落。应用单一因子标准指数法对湖泊表层沉积物磷素进行生态风险评价表明,湖区北部表层沉积物总磷含量超标,存在一定的安全风险,同时AB1沉积物上部较底部活性磷(Fe/Al-P和OP)增加较多、且活性磷(Fe/Al-P和OP)是AB1沉积物磷增加的主要形态,因此连环湖敖包泡沉积物中磷向上覆水体释放的风险增加,对湖泊水体的富营养化的影响应予以关注。     

Amounts and mineralization of organic phosphorus compounds and derivatives in some surface soils of bangladesh

Concentrations of a few organic phosphorus compounds and their hydrolysis products have been determined in a number of Bangladesh soils. The amounts of DNA and its derivatives, inositol penta- and hexaphosphates, ranged from 0.16 to 1.30, and 18.5 to 130.0 ppm, respectively. The hydrolysis products of phospholipids such as choline, ethanolamine and glycerophosphate ranged from 0.36 to 3.29, 0.28 to 2.52 and 0.20 to 1.05 ppm, respectively. Multiple correlation suggested that pH, organic matter, organic phosphorus and total phosphorus were collectively related to the amounts of different organic phosphorus fractions in soil samples. Individually, DNA and its derivatives were found to be significantly related to total phosphorus and inositol penta- and hexaphosphates to organic phosphorus. Choline was significantly related to organic matter, organic phosphorus and total phosphorus; ethanolamine to organic matter and total phosphorus; and glycerophosphate to organic phosphorus.Moisture and lime promoted progressive mineralization of organic phosphorus with time. Potassium dihydrogen phosphate, glucose and ammonium sulphate showed rapid initial and final mineralization. In contrast, the application of compost caused an initial luxury immobilization followed by a marked increase in mineralization with time. Maximum mineralization was observed when ammonium sulphate was added to samples in submerged conditions. The least mineralization occurred when lime was added to samples at 50% of field moisture capacity.     

长期施肥对塿土磷素状况的影响

利用塿土12年长期肥料定位试验,研究了不同施肥方式对耕层土壤全磷(TP)、有机磷(OP)与有效磷（Olsen-P）的影响。结果表明,施用化学磷肥提高了耕层土壤TP、Olsen-P含量,但并未提高OP含量;对照与磷钾处理的OP含量有降低趋势。当基于含氮量施有机肥时,土壤TP和Olsen-P含量大幅度提高,也提高了OP含量,但OP/TP比率在降低到一定程度后维持在一个较为稳定的水平;即使施用有机肥的处理,磷素也主要以无机形态累积。土壤Olsen-P与TP或两者的增加量都呈显著的线性相关,塿土TP每提高100 mg/kg,Olsen-P增加量约为20.8 mg/kg,且单位土壤全磷增加带来的Olsen-P增加有随施肥时间降低的趋势。在土壤Olsen-P含量达到一定水平时应考虑减少磷肥用量。基于有机肥中磷素含量来推荐有机肥施用或延长其施用的时间间隔,将有助于减少由于有机肥施用带来的磷素大量快速累积。     

基于SWAT模型的小流域非点源氮磷迁移规律研究

非点源污染是影响农业水土环境的重要因素。在GIS平台的支持下,运用SWAT模型,以长江下游岔河小流域为研究对象,分析了氮磷流失时空分布规律,并模拟不同灌溉方式下非点源氮磷流失变化。结果表明:率定后的模型适用于小流域非点源污染的模拟;降雨量与径流及有机氮磷流失具有明显的相关关系,汛期(6-9月)的径流量占全年径流量的56.40%,有机氮磷流失量分别占到64.89%和59.70%;在空间尺度上,有机氮与有机磷负荷空间分布相似,呈现出随地表径流向岔河主河道逐渐汇聚的分布特征,大豆和水稻田是非点源污染的主要贡献地区;通过情景模拟发现,不同灌溉方式对小流域氮磷流失影响显著,对水稻田实行优化灌溉,采取浅灌高蓄的控制方法,可以有效改善小流域农业水土环境。     

有机物料中有机磷矿化进程的研究

采用室内恒温好气培养试验,研究不同C/N有机物料腐解过程中有机磷的矿化特征与进程。结果表明:新鲜粪肥类有机物料中磷以无机磷(P i)为主,秸秆类有机物料中磷以有机磷(Po)为主,有机物料中有机磷在培养的前30天矿化最快,之后趋于平缓,培养结束时,供试有机物料中磷均以无机磷为主,约占全磷的70~90%;不同有机物料有机磷的残留率在腐解前期差别很大,后期趋于一致,有机磷的矿化要先于有机氮;有机物料中磷的矿化速率大小与C/PO及有机磷含量的大小存在显著的相关关系。     

喀斯特山区生态恢复中土壤剖面无机磷形态分布特征及其影响因素

[目的]研究贵州喀斯特高原峡谷生态恢复过程中土壤剖面无机磷的形态分布特征,为喀斯特山区生态恢复过程土壤磷素的研究及科学管理提供科学依据。[方法]选取贵州省晴隆县莲城镇内4种代表性样地(耕地、退耕还草地、荒草地和林草间作地)为对象,研究土壤无机磷形态特征及影响因素。[结果] 4种代表性样地土壤全磷和速效磷含量分别在1.96～3.88 g/kg,1.16～11.25 mg/kg范围。无机磷总量在591.39～1 024.79 mg/kg之间,表现为:耕地退耕还草地林草间作地荒草地。不同土壤剖面磷素活化系数(PAC)均远小于2%。不同形态的无机磷含量依次表现为:O-PFe-PCa-PAl-P;各形态的无机磷均与速效磷呈极显著正相关关系(O-P除外);各无机磷形态之间呈显著相关关系。不同形态的钙素(水溶性钙和交换性钙)以及pH值、黏粒含量均会影响各形态无机磷的比例以及相互间的转化。[结论]在生态恢复过程中,研究区由耕地→退耕还草地→荒草地→林草间作地,地表植物逐渐恢复,土壤理化性质得到了改善,土壤磷素含量也随之增加。     

Interactions of organic phosphorus with soil minerals and the associated environmental impacts: A review

As an important part of the soil phosphorus(P) pool, organic P(OP) is widely found in terrestrial and aquatic environments(e.g., soils and sediments).The interfacial behavior of OP on natural minerals affects the transport, transformation, and bioavailability of P in the environment. This paper reviews the processes involving adsorption-desorption, dissolution-precipitation, and enzymatic/mineral-mediated hydrolysis of OP at the mineral-water interface, and their subsequent effects on OP speciat...     

洱海缓冲带典型入湖溪流沉积物磷形态的分布特征

[目的]了解洱海缓冲带典型入湖河流沉积物磷形态分布特征,为洱海生态系统修复提供科学依据。[方法]对洱海缓冲带3条典型入湖溪流茫涌溪、莫残溪、中和溪进行了沉积物的采集,并对其中总磷(TP)、无机磷(IP)、铁铝磷(Fe/Al-P)、钙磷(Ca-P)4种磷形态的含量进行测定。[结果]3条溪流沉积物磷形态沿程变化趋势大不相同;洱海的缓冲带结构缺乏合理性,有待改进;土地的利用类型不同对洱海缓冲带入湖河流沉积物磷形态贡献率也就不同;入湖口沉积物磷形态含量从大到小均依次为:中和溪莫残溪茫涌溪;从磷形态组成来看,茫涌溪沉积物中的磷主要为Ca-P,莫残溪、中和溪则均以Fe/Al-P为主;磷形态的相关性分析表明,3条溪沉积物中TP含量的变化与Fe/Al-P,及有机磷(OP)呈极显著正相关。[结论]沉积物中OP的变化对Ca-P,Fe/Al-P的含量有一定影响。Fe/Al-P含量对IP含量有较高的贡献率。Fe/Al-P与Ca-P之间相关性较弱。     

有机磷与土壤矿物相互作用及其环境效应研究进展

土壤有机磷是土壤环境中重要的磷组分,其在环境中的界面反应影响着磷素的迁移、转化、生物有效性以及环境行为。本文主要总结了土壤中典型有机磷在矿物表面的吸附-解吸、溶解-沉淀等反应特性和微观机制,以及有机磷-矿物相互作用对有机磷形态、金属离子界面反应行为,以及矿物胶体化学稳定性与溶解转化的影响等环境效应。土壤有机磷可含多个磷酸基团,相对分子质量大,电荷密度高,通过界面反应与环境矿物发生强烈的相互作用,并影响矿物的电荷性质、共存金属离子的吸附特性、以及胶体化学稳定性。有机磷界面反应特性和机制受矿物类型和结晶度、有机磷相对分子质量、pH、温度和共存离子等因素的影响。有机磷在矿物表面的吸附密度一般随着体系pH、矿物结晶度和有机磷相对分子质量的升高而降低。有机磷一般可在矿物表面形成内圈络合物,某些情况下还存在氢键作用,甚至转化形成表面沉淀。有机磷和金属离子在矿物表面的吸附一般存在协同效应(尤其是在低pH条件下),即金属离子促进了有机磷的吸附,有机磷也促进金属离子的固定;吸附机制因反应体系而异,主要包括形成三元表面络合物和表面沉淀等,多数时候存在多种机制的共同作用。最后讨论了环境中有机磷与矿物相互作用的主要研究热点和方向。     

沉积物中核酸态有机磷及其矿化过程研究

水体沉积物界面中磷的释放机制非常复杂,生物作用导致的pH值和氧化还原条件变化对湖泊沉积物矿化能力有显著影响。普遍认为沉积物中有机磷的矿化过程是对水体富营养化具有重要贡献的环节之一,而核酸态有机磷可从一定程度上表征微生物水平,反应微生物对矿化作用的影响。据此采用DNA提取的方法对沉积物中核酸态有机磷的含量进行测定,并模拟沉积物中核酸在不同pH和溶解氧条件下的矿化过程。结果表明,DNA提取方法可以快速、准确提取沉积物中核酸磷;沉积物中核酸磷含量为0．43～0．61μg·g^-1,占有机磷总量的0．27％～0．37％,精确度为1．58％～3．63％。模拟实验结果表明,在两种情况下上覆水中总磷浓度均呈波动式上升,在pH接近7时沉积物中核酸磷较低,有氧条件下核酸磷呈下降趋势。     

Nitrogen and phosphorus constrain labile and stable carbon turnover in lowland tropical forest soils

Tropical forests contain a large stock of soil carbon, but the factors that constrain its mineralization remain poorly understood. Microorganisms, when stimulated by the presence of new inputs of labile organic carbon, can mineralize (‘prime’) soil organic matter to acquire nutrients. We used stable carbon isotopes to assess how nutrient demand and soil properties constrain mineralization of added labile (sucrose) carbon and pre-existing (primed) soil carbon in tropical forest soils. In a series of lowland tropical forest soils from Panama, we found that the mineralization of fresh labile carbon was accelerated foremost by phosphorus addition, whereas the mineralization of pre-existing soil carbon was constrained foremost by nitrogen addition. However, there was variation in the relative importance of these nutrients in different soils and the largest effects on the acceleration of sucrose metabolism and constraint of priming occurred following the addition of nitrogen and phosphorus together. The respiration responses due to sucrose or primed soil carbon mineralization were reduced at pH below 4.8 and above 6.0. We conclude that in these tropical forest soils, phosphorus availability is more important in promoting microbial mineralization of sucrose carbon, whereas nitrogen availability is more important in constraining the priming of pre-existing soil organic carbon. This response likely arises because nitrogen is more closely coupled to organic matter cycling, whereas phosphorus is abundant in both organic and inorganic forms. These results suggest that the greatest impact of priming on soil carbon stocks will occur in moderately acidic tropical forest soils of low nitrogen availability. Given long-term changes in both atmospheric carbon dioxide and nitrogen deposition, the impact of priming effects on soil carbon in tropical forest soils may be partially constrained by the abundance of nitrogen.     

德州引黄灌区主要河流沉积物各形态磷分布研究

对河流沉积物中各形态磷（P）的研究有助于认识沉积物中P的行为特征、水-沉积物界面上P的迁移、转化、可利用性以及水体营养状态。以德州引黄灌区为例,采用改进的RuttenbergSEDEX分级连续提取方法,分析了漳卫新河、马颊河和德惠新河表层沉积物中主要赋存形态磷的含量,以期为评价该地区水环境质量,探究水体污染来源以及制定相应的治理措施提供科学依据。结果表明,河流表层沉积物中总磷（TP）的含量为437.4～1197.0mg.kg-1,无机磷（IP）的含量为373.8～1136.4mg.kg-1,占TP的64.3%～98.5%。IP又分为弱吸附态磷（Lsor-P）、铁结合态磷（Fe-P）、自生磷和碎屑磷（Au-P＆De-P）,含量分别为26.4～415.2mg.kg-1、6.3～331.2mg.kg-1和302.3～563.6mg.kg-1,分别占TP的5.2%～54.3%、0.8%～31.5%、35.7%～80.9%。有机磷（OP）的含量为9.0～413.4mg.kg-1,占TP含量的1.55%～35.68%。三条河流沉积物中不同形态P含量的变化趋势不同,空间变异性大;从上游到下游,漳卫新河底泥中的TP呈下降趋势,马颊河底泥中TP变化幅度不大,德惠新河底泥中TP呈现出先增高后降低的趋势,变化幅度较大。相关分析表明黄河下游引黄灌区沉积物中部分形态P之间存在显著的相关性,表明这些形态的P可能来源相同或者在某些特定的条件下会相互转化。最后,提出了控制P排放来源、加强污水处理、提高农业P的利用效率以及加强相关的研究等建议。     

Rates of in situ carbon mineralization in relation to land-use, microbial community and edaphic characteristics

Plant-derived carbon compounds enter soils in a number of forms; two of the most abundant being leaf litter and rhizodeposition. Our knowledge concerning the predominant controls on the cycling of leaf litter far outweighs that for rhizodeposition even though the constituents of rhizodeposits includes a cocktail of low molecular weight organic compounds which represent a rapidly cycling source of carbon, readily available to soil microbes. We determined the mineralization dynamics of a major rhizodeposit, glucose, and its relationship to land-use, microbial community and edaphic characteristics across a landscape in the southeastern United States. The landscape consists of cultivated, pasture, pine plantation, and hardwood forest sites (n = 3). Mineralization dynamics were resolved in both winter and summer using an in situ¹³C-glucose pulse-chase approach. Mineralization rates of the labeled glucose decline exponentially across the 72 h measurement periods. This pattern and absolute mineralization rates are consistent across seasons. An information-theoretic approach reveals that land-use is a moderately strong predictor of cumulative glucose mineralization. Measures assessing the size, activity, and/or composition of the microbial community were poor predictors of glucose mineralization. The strongest predictor of glucose mineralization was soil-extractable phosphorus. It was positively related to glucose mineralization across seasons and explained 60% and 48% of variation in cumulative glucose mineralization in the summer and winter, respectively. We discuss potential mechanisms underlying the relationship between soil phosphorus and glucose mineralization. Our results suggest that specific soil characteristics often related to land-use and/or land-management decisions may be strong predictors of glucose mineralization rates across a landscape. We emphasize the need for future research into the role of soil phosphorus availability and land-use history in determining soil organic carbon dynamics.     

Aging effects of organic and inorganic fertilizers on phosphorus fractionation in a calcareous sandy loam soil

In most arid and semiarid soils, naturally occurring phosphorus(P) is a major yield-limiting plant nutrient. In this study, to investigate the effects of organic(OP) and inorganic P(IP) sources on P fractionation, a calcareous sandy loam alkaline soil was fertilized with OP and IP fertilizers at low(80 mg P kg~(-1) soil) and high(160 mg P kg~(-1) soil) application rates. Three combinations of OP and IP(i.e., 75% OP + 25% IP, 50% OP + 50% IP, and 25% OP + 75% IP) were applied at low and high application rates,respectively, followed by soil aging for 21 d. Soil samples were collected after 1, 2, 3, 7, and 21 d and subjected to sequential extraction to analyze soluble and exchangeable, Fe-and Al-bound, Ca-bound, and residual P fractions. The soluble and exchangeable P fraction significantly increased up to 24.3%, whereas the Ca-bound fraction decreased up to 40.7% in the soils receiving 75% OP + 25% IP and 50% OP + 50% IP, respectively, compared with the control(receiving no P fertilizer). However, the transformation of P fractions was influenced by aging time. Addition of P sources caused instant changes in different P fractions, which then tended to decline with aging time. Change in soil p H was the limiting factor in controlling P availability. At high application rate, the OP source significantly increased soil P availability compared with the IP source with soil aging. Depending on P fractionation, a proper combination of OP and IP fertilizers, as long-term slow and instant P-releasing sources for plant uptake, respectively, may be a sustainable strategy to meet crop P requirements in the arid and semiarid soils.     

昆阳磷矿植被修复土壤理化与生物学性状的典型相关分析

深入了解昆阳磷矿植被修复土壤理化性状指标与生物学各个性质指标之间的关系,可为进一步筛选土壤质量评价指标提供参考依据。选择了昆阳磷矿旱冬瓜人工林6个不同植被恢复年限样地,研究其土壤厚度、容重、孔隙度、毛管孔隙度、含水量、pH值、有机质、碱解氮、全氮、有效磷、全磷、速效钾、全钾和土壤微生物生物量碳（MBC）、微生物生物量氮（MBN）、氮矿化速率、β-葡萄糖苷酶、酸性磷酸酶、脲酶的关系,综合土壤13个理化性状指标和6个生物学性状指标的典型相关分析得到4对典型变量,其典型相关系数分别为0.997 0,0.988 9,0.879 9,0.856 8,均达到极显著水平（p≤0.01）,说明土壤理化性状和生物学性状存在显著相关关系,而这两组性状的显著相关主要是由土壤碱解氮、有机质、有效磷、全磷、pH值和微生物生物量碳（MBC）、微生物生物量氮（MBN）、氮矿化速率、脲酶的密切相关引起的,其中有机质与微生物生物量碳（MBC）、微生物生物量氮（MBN）、脲酶之间呈极显著相关,有效磷、全磷与氮矿化速率、微生物生物量氮（MBN）、微生物生物量碳（MBC）也呈极显著相关,碱解氮、pH值与微生物生物量碳（MBC）、微生物生物量氮（MBN）、脲酶呈极显著相关,全氮与β-葡萄糖苷酶、氮矿化速率、微生物生物量氮（MBN）呈极显著相关。     

长期施肥措施下土壤有机碳矿化特征研究

研究长期不同施肥措施下旱作农田土壤有机碳的矿化特征及其温度敏感性可为加深理解土壤碳循环过程提供理论依据。本文以半干旱黄土区粮-豆轮作体系为研究对象,通过两种不同温度(15℃和25℃)的室内培养试验,分析了长期不同施肥措施下土壤有机碳矿化的动力学特征及其温度敏感性。研究结果表明,土壤有机碳矿化速率在培养初期较高,之后缓慢下降。施肥措施和培养温度对土壤有机碳矿化均具有显著影响。与不施肥对照(CK)相比,在15℃培养条件下,长期单施磷肥(P)、氮磷配施(NP)和氮磷有机肥配施(NPM)处理的土壤有机碳累积矿化量(C_(min))分别增加41%、85%和89%,在25℃培养条件下,分别增加7%、46%和77%。另外,与CK处理相比,P、NP和NPM处理土壤有机碳矿化的温度敏感性(Q_(10))分别降低25%、21%和6%。施肥改变了土壤有机碳矿化的动力学参数,其改变程度与施肥种类和培养温度有关。与CK处理相比,在15℃培养条件下,P、NP和NPM处理的土壤潜在矿化有机碳量(C_p)分别增加29%、65%和48%;在25℃培养条件下,NP和NPM处理的C_p分别增加2%和21%,而P处理则减少36%。不同施肥处理土壤有机碳矿化速率常数(k)在15℃培养条件下变化较小,在25℃培养条件下则有较大幅度的增加。在25℃培养条件下,C_(min)和Cp随土壤有机碳和全氮含量的增加而显著增加。可见,长期施肥显著促进了半干旱黄土区粮-豆轮作体系土壤有机碳的矿化,减弱了土壤有机碳矿化的温度敏感性。     

南美蟛蜞菊、蟛蜞菊和杂交蟛蜞菊土壤磷组分特征及其影响因素

为探究入侵植物南美蟛蜞菊土壤磷转化过程与驱动机制,采用野外控制试验,比较研究了南美蟛蜞菊、蟛蜞菊和杂交蟛蜞菊土壤磷组分、微生物生物量磷以及酸性磷酸酶和碱性磷酸酶活性。结果表明：3种蟛蜞菊土壤易分解态磷仅占全磷的2.2%~6.3%,且全碳与有机磷的比例大于200,表明本研究区受到磷限制。有机磷是土壤磷库的主要组分,在南美蟛蜞菊、蟛蜞菊和杂交蟛蜞菊土壤中分别占全磷的28.7%、17.6%和25.0%。相关分析表明,三种蟛蜞菊土壤有机磷磷组分矿化主要受碱性磷酸酶影响,受酸性磷酸酶影响较小,且碱性磷酸酶与有机磷呈显著负相关,与易分解态磷呈显著正相关。因此,在缺磷的亚热带地区,碱性磷酸酶对有机磷的分解可能是该地区入侵植物对磷限制的适应机制。     

Bowman-Cole土壤有机磷分组法的探讨

采用Bowman-Cole法的几种浸提剂和浸提步骤大体上可将矿化难易不同的几种有机磷化合物区分开来.采用该法所测得的土壤有机磷四种组分,其矿化速率有随土壤有机磷组分活性增强而增加的趋势.因此,该法能用来监测土壤有机磷对植物有效性的高低.