共查询到19条相似文献,搜索用时 46 毫秒
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通过田间微区试验,研究施用硒肥及4种不同形态磷肥对小麦硒吸收和磷肥利用率的影响。硒肥设不施硒(SE0)和施硒(SE)2个处理,各硒肥处理下设置5个磷肥处理,分别为不施磷肥(CK)、施用磷酸(AP)、聚磷酸铵(APP)、磷酸一铵(MAP)和磷酸二铵(DAP)。结果表明:不施硒肥条件下,不同形态磷肥均能促进小麦硒吸收,但小麦籽粒硒含量均未达到富硒稻谷国家标准。其中,APP处理磷肥利用率最高,分别较AP、MAP和DAP处理提高2.49、4.86和7.07个百分点。施硒肥条件下,小麦籽粒硒含量显著增加。其中,MAP处理小麦籽粒硒含量和产量分别较CK处理增加68.11%和56.70%,磷肥利用率分别较AP、APP和DAP处理提高16.09、15.03和14.86个百分点。因此,硒肥配合施用磷酸一铵能够增加小麦籽粒硒含量,提高磷肥利用率和产量。 相似文献
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滴灌条件下不同磷肥品种对土壤磷有效性及玉米产量的影响 总被引:7,自引:1,他引:6
通过模拟试验及田间试验研究不同磷肥施用后对土壤磷有效性的动态变化和分布特点,以及玉米磷吸收和产量响应的影响。田间和模拟试验包括4个处理,分别为对照(不施磷肥)、MAP(磷酸一铵)、UP(磷酸脲)和AAP(水溶性聚磷酸铵)。模拟试验中,不同磷肥均提高土壤中有效磷含量,APP处理10—15 cm土层有效磷含量增加最多。在均匀的养分投入和管理水平下,3种磷肥品种均有土壤酸化效果,其中UP处理最为显著。田间试验中,玉米生长后期,APP处理的土壤有效磷含量在深层土壤分布较高,UP处理土壤pH较低,均有利于改善土壤的供磷能力,提高土壤有效磷含量;APP处理对根系发育有显著的促进作用,玉米组织磷含量和磷吸收量最大,产量最高(14.40 t/hm^2)。3种磷肥中,APP处理移动性较好,土壤深层有效磷含量增加,利于根系生长和养分的吸收,提高产量。水溶性聚磷酸铵(APP)是一种适合于玉米灌溉施肥的肥料。 相似文献
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石灰性土壤施用不同磷肥对玉米苗期生长和土壤无机磷组分的影响 总被引:2,自引:0,他引:2
研究旨在探讨不同磷肥品种对玉米生长发育和土壤无机磷组分的影响,以期为磷肥高效利用提供参考。采用盆栽试验,设置6个处理:磷酸一铵(MAP)、过磷酸钙(SSP)、聚磷酸铵(APP)、氮磷复合肥硝酸磷肥(NiP)、硫酸铵+过磷酸钙混施(SA+P),试验60天后测定了玉米的生物学指标和玉米植株磷素含量,同时测定了土壤有效磷与土壤无机磷组分含量状况。结果表明:玉米生物学性状、磷素累积量和磷肥利用效率均表现出APPMAP、NiPSSP、SA+PCK的趋势。相较于对照,APP、MAP、NiP处理显著提高玉米植株的株高、叶面积、地上部和根系干重,株高增幅在23.3~35.1 cm,叶面积增加57.1~89.0 cm~2,地上部和根系干重分别增加265%~420%和171%~218%。APP处理植株磷素累积量达到49.02 mg/盆,磷肥利用效率达到36.75%,显著高于NiP和MAP的21.43%和19.42%。相较于对照,APP和MAP处理的Ca_2—P、Ca_8—P和Fe—P呈显著性增加,上述3种无机磷组分含量与玉米植株磷累积量呈极显著正相关关系(p0.001)。北方石灰性土壤聚磷酸铵(APP)是一种表现良好的磷肥类型,这对减磷增效背景下的粮食安全和磷肥高效利用有重要应用价值。 相似文献
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明确适合新疆滴灌玉米生产的磷肥品种。在2017~2020年连续进行了4年田间试验方法,设置了6个处理:磷酸脲(UP)、磷酸二氢钾(MKP)、聚磷酸铵溶液(APP)、磷酸二铵(DAP)、磷酸一铵(MAP)、不施磷肥(CK),各处理除CK以外氮、磷、钾投入量相同。试验在玉米开花期和成熟期分别采集植物样品。结果表明:APP、UP、MAP较其他处理可显著促进玉米生长,提高玉米开花期叶面积指数(LAI),其中APP的株高和LAI最高(P<0.05);滴施磷肥能促进玉米地上部生物量增长和干物质转移,玉米在开花期和成熟期地上总生物量表现为APP>UP>MAP>MKP>DAP>CK;在玉米干物质转移量、转移率和对籽粒的贡献率上,APP处理最高,显著高于其他处理(P<0.05);滴施APP、UP、MAP能显著提高玉米产量,滴施APP的玉米增产范围为19.1%~44.4%,UP增产范围为14.7%~39.6%,MAP在2020年相比CK增产率为18.7%;滴施磷肥能提高玉米经济效益,其中APP经济效益最高,较CK增加了4962元/hm2。综上所述,在新疆滴灌玉米的磷肥选择中,优先顺序应该是APP、UP、MAP、MKP、DAP。因此,在新疆滴灌玉米磷肥选择中,聚磷酸铵溶液是最优选择,其次是磷酸脲和磷酸一铵。 相似文献
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探究水肥一体化下磷肥种类和施用方式对棉花产量、磷素积累量、土壤磷素有效性和磷肥利用率的影响,以期为棉田优化磷肥施用方式提供理论依据和技术参考。田间试验于2021年在新疆昌吉州棉花主产区进行。试验设不施磷肥对照(CK)、基施重过磷酸钙(TSP)、基施磷酸一铵(MAP-B)、基施+滴施磷酸一铵(50%基施,25%+25%分别在蕾期和花铃前期)(MAP-D)、基施+滴施磷酸一铵(50%基施,25%+25%分别在蕾期和花铃前期)和聚谷氨酸(MAP-P)5个不同施肥处理,测定指标包括土壤有效磷、植株生物量、植株磷积累量和籽棉产量,并计算磷肥利用率。在棉花盛花期和盛铃期,磷肥滴施显著提高0~20 cm土层有效磷含量,0~5 cm土层尤为显著,MAP-P处理有效磷含量比CK处理分别提高136.27%和113.99%。TSP、MAP-B、MAP-D和MAP-P处理产量比CK处理分别提高17.65%、16.25%、19.37%和31.88%。棉花生育期内,磷肥滴施植株累积吸磷量高于基施,各处理植株累积吸磷量在盛铃期达最大,MAP-P处理植株累积吸磷量整体高于其余处理,在苗期、蕾期、盛花期和盛铃期比CK处理分别提高50.92%、55.38%、81.33%和84.69%。在等量施磷条件下,磷肥滴灌追施的磷肥利用率高于基施。MAP-P处理磷肥利用率、磷肥累积利用率、磷肥农学效率和磷肥偏生产力均高于其余处理,磷素表观平衡低于其余处理,磷肥利用率达33.94%,比TSP、MAP-B和MAP-D处理分别提高20.23%、25.28%和16.71%。水磷一体下,磷肥结合活化剂(聚谷氨酸)滴施显著提高土壤磷素有效性和棉花产量。MAP-P处理提高了棉花产量和磷肥利用率,减少了土壤磷素的盈余。 相似文献
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探究聚磷酸盐与常规水溶磷肥在滴灌棉田中最佳的掺混方式,以期达到磷肥施用兼顾经济和高效利用的 目的。在等磷施用量下(P2O5 120 kg/hm2),将聚磷酸铵 1(APP1)、聚磷酸铵 2(APP2)和三聚磷酸钾(KTPP) 按照含 P2O5 占总磷用量的 10%、30% 和 50% 与水溶性磷酸二铵掺混,形成 9 种不同种类的聚磷酸掺混磷肥,依 次表示为 APP1-10、APP2-10、KTPP-10、APP1-30、APP2-30、KTPP-30、APP1-50、APP2-50 和 KTPP-50。同 时设置不掺混聚磷酸盐的常规水溶磷肥(DAP)和不施磷肥(P0)为对照。于滴灌棉花盛花期和盛铃期分别测定 土壤深度 0 ~ 20 和 20 ~ 40 cm 土壤有效磷含量、棉花植株生物量和磷吸收量。同时监测棉花结铃动态,成熟期 测定产量及产量构成。0 ~ 20 cm 土壤有效磷含量、棉花地上部生物量、磷吸收量、棉花单株结铃数、籽棉产量、 伏前桃数、磷肥农学利用率和产投比均随聚磷酸盐掺混比例的增加表现出增加趋势。3 种不同聚磷酸盐在增加土 壤有效磷含量、棉花地上部生物量、磷吸收量、棉花单株结铃数、籽棉产量、伏前桃数、磷肥农学利用率和产投 比上总体表现为 APP2 最优,其次是 KTPP,最后为 APP1。在棉花盛花期和盛铃期,APP2-50 处理 0 ~ 20 cm 土 壤有效磷含量和棉花磷吸收量均显著高于 DAP 和其他施磷处理,20 ~ 40 cm 土壤有效磷在所有施肥处理间无显 著性差异。盛花期 APP2-50 处理棉花生物量与 DAP 无显著差异,但在盛铃期 APP2-50 棉花生物量显著高于 DAP 和其他施磷处理。所有聚磷酸掺混磷肥处理棉花结铃数均显著高于 DAP,但棉花单铃重在各施磷处理间无差异。 APP2-50 处理籽棉产量、磷肥农学利用率和产投比最高。与 DAP 相比,APP2-50 处理籽棉产量、磷肥农学利用率 和产投比分别增加了 10.7%、88.3% 和 7.6%。以上结果表明,将 APP2 按照含 P2O5 占总磷用量的 50% 与水溶性磷 酸二铵掺混施用,可以提高滴灌棉田土壤有效磷含量,且对棉花产量和产投比增加有积极作用,是一种兼顾磷肥 高效和经济施用的施肥选择。 相似文献
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水磷一体化对磷素有效性与磷肥利用率的影响 总被引:14,自引:1,他引:14
水肥一体化是发挥水肥耦合效应提高养分效率的重要途径,然水磷一体化研究较少。本文在模拟滴灌条件下研究了液体磷肥和固体颗粒磷肥(TSP)及其不同施用方法对土壤磷移动性、各形态无机磷含量动态变化的影响,比较了玉米磷素营养与磷肥利用率对不同磷源及其施用方式的响应,旨在提出滴灌条件下磷肥高效利用的最优策略。研究结果表明:1)与TSP肥料分次施用相比,液体磷肥分次施用更能提高土壤磷素有效性,在各土层Ca2-P与树脂磷(resin-P)平均含量分别提高12.4%与21.6%,且可显著提高磷在土壤中的移动性(P0.05),resin-P含量的垂直下降幅度降低56.5%;2)与TSP分次施用相比,液体磷肥分次施用的土壤中高活性无机磷含量(Ca2-P、resin-P及Na HCO3-P之和)占无机磷总量的比例提高21.0%,而低活性无机磷含量(Ca10-P与residue-P之和)占无机磷总量的比例则下降10.1%,说明液体磷肥分次施用可减小磷肥在土壤中的固定转化;3)玉米地上部干物质、叶片吸磷量和植株磷素累积吸收量均对不同磷源与施用方式有明显响应(P0.05),液体磷肥分次处理的玉米生物量、吸磷量及肥料利用率分别比TSP肥料分次处理提高27.1%、34.6%及61.4%。水磷一体化施用可提高磷在土壤中的移动性和有效性,减少磷的固定转化,显著改善玉米磷素营养,并明显提高磷肥利用率。 相似文献
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探讨了通过目标产量需磷量确定磷肥用量并在棉花生长早期集中施用的磷肥管理方法以维持适宜的土壤供磷强度、实现作物高产和磷肥高效利用目标的可行性,为磷肥减施增效提供依据。在新疆石河子选择中等供磷强度的农田(有效磷23.6 mg·kg-1),以覆膜水肥一体化棉花(Gossypium hirsutum)种植体系为对象,根据该区域2.7 t·hm-2皮棉产量的需磷量确定试验的磷肥用量(52.4 kg·hm-2,以P计),开展了两年田间试验。试验选用三种不同性质的水溶性磷肥,设置不施磷肥(CK)、滴施磷酸一铵(MAP)、滴施磷酸脲(UP)和滴施聚磷酸铵(APP)4个处理。通过测定不同处理棉花的产量与磷吸收量,计算磷肥偏生产力(PFP)、磷肥农学效率(AEP)、磷肥当季利用率(PUE)与当季磷肥回收率(即作物吸磷量与磷肥施用量的比值);通过棉花不同生育期分层取样,分析了不同磷肥品种处理引起的土壤有效磷供应强度和无机磷形态组成的变化,以期阐明不同磷肥的空间有效性与棉花生长需求的匹配程度。研究结果表明:(1)施磷处理两年的皮棉产量平均为2.... 相似文献
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施磷对玉米吸磷量、产量和土壤磷含量的影响及其相关性 总被引:16,自引:0,他引:16
为了给玉米磷高效利用提供理论依据, 在低磷土壤(Olsen-P 4.9 mg·kg-1)上, 通过田间试验, 研究了施磷0(T0)、50 kg(P2O5)·hm-2(T1)、100 kg(P2O5)·hm-2(T2)、200 kg(P2O5)·hm-2(T3)、1 000 kg(P2O5)·hm-2(T4)对两个玉米品种"鲁单9002" (LD9002)、"先玉335"(XY335)的产量、磷素吸收利用及根际磷动态变化的影响。结果表明: 两玉米品种根际土、非根际土速效磷含量在不同生育时期都表现为T12O5)·hm-2的T3处理非根际土转化为根际土土壤磷的量最大, 同时玉米生物量、产量、磷转移量也达到最高, 而施磷1 000 kg(P2O5)·hm-2处理玉米生物量、产量与中磷水平相比没有显著增加, 但植株吸磷量较高。XY335的花后磷转移量小于LD9002。相关分析表明, LD9002根际土、非根际土速效磷含量与茎、叶吸磷量之间显著相关, 以播种后79 d与茎、叶磷浓度、吸磷量、生物量、产量之间的相关系数最高; 而XY335根际土、非根际土速效磷含量与茎、叶磷浓度之间显著相关, 在播种后47 d期间与茎、叶磷浓度、吸磷量、生物量、产量之间的相关性最好。因此, 在低磷土壤上, LD9002和XY335分别在播种后79 d和47 d时是植株对磷的敏感期, 可以通过测试根际土、非根际土速效磷含量来反映土壤的供磷状况; LD9002在79 d时最大吸磷量需要的根际土、非根际土速效磷含量分别为54.95 mg·kg-1、32.99 mg·kg-1, XY335品种在47 d时最大吸磷量需要的根际土、非根际土速效磷含量分别为51.24 mg·kg-1、35.35 mg·kg-1; 施磷量1 000 kg(P2O5)·hm-2处理两品种玉米产量、生物量、磷积累量与施磷量100~200 kg(P2O5)·hm-2处理没有显著差异。 相似文献
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采用随机区组设计,以塔额盆地主栽甜菜品种 (Beta796)为试验材料开展大田试验。在氮、钾施用量相同的情况下,设置滴灌施磷(P2O5)0 kg·hm-2(P0)、120 kg·hm-2(P1)、180 kg hm-2(P2)和240 kg·hm-2(P4)4个处理,研究甜菜主要生育时期磷养分吸收、积累和分配规律,分析甜菜磷养分利用效率,以期为甜菜高产、优质、高效生产中磷肥管理提供理论依据。结果表明,滴灌施磷能增加甜菜干物质积累量,P1、P2和P3处理干物质积累量较P0处理分别增加16.6%、24.7%和27.9%,其中P2、P3处理间差异不显著。甜菜干物质积累Logistic方程显示施磷能显著提高甜菜干物质最大累积速率和平均积累速率,最高分别可达443.7和185.7 kg·hm-2·d-1。甜菜磷积累总量随施磷增加而增加,有利于提高生育后期甜菜磷积累量,尤其是甜菜地下部的磷积累量;收获期P3处理地下部磷积累量为74.25 kg·hm-2,较P0、P1和P2处理分别显著增加76.7%、24.8%和12.1%。施磷对收获期甜菜磷素在地上部、地下部分配无显著影响。试验结果表明滴灌施磷显著提高了甜菜产量,增加了甜菜块根的含糖量及产糖量。 P1、P2和P3处理块根产量比P0处理分别增加11.57%、18.58%和20.89%,甜菜蔗糖含量比P0处理分别增加1.18%、2.90%和3.37%。施磷对甜菜品质影响不大。施磷增加了磷肥的当季利用率,不同处理磷肥利用率可达31.54%~39.66%。P2处理能增加磷素农学效率,磷肥偏生产力则随着施磷量增加而减少。综合甜菜相对产糖量、经济效益及磷肥利用效率,滴灌施磷(P2O5)85.1~187.4 kg·hm-2,可以实现甜菜高产和磷肥高效利用的目的。 相似文献
13.
为阐明施磷对不同质地棉田土壤磷素有效性及磷肥利用率的影响,以盆栽试验为基础,在不同质地(粘土、壤土、砂土)上设计5个磷素水平(P0、P150、P300、P600、P1200)研究棉田磷素状况和棉花磷素积累及磷肥利用率。结果表明:不同质地棉田土壤有效磷含量在苗期和蕾期均随施磷量的增加而增加,苗期时粘土、壤土、砂土的土壤有效磷含量在P1200处理下与对照相比分别增加了80.94%、85.78%、94.41%,蕾期则分别增加了76.82%、85.10%、94.20%。苗期时,土壤全磷含量分别在粘土P600、壤土P1200、砂土P600处理下达到最大值;蕾期时粘土、壤土和砂土的全磷含量均在P1200处理达到最大值,土壤磷素活化系数在苗期时表现为粘土砂土壤土,蕾期磷素活化系数在粘土和砂土基本呈持续递增状态,最大值与对照(P0)相比分别增加了34.22%、85.71%。植物整株干物质积累在不同土壤质地表现为粘土砂土壤土。植物全磷含量则是壤土略低于粘土,砂土最低。棉花整株磷素积累量在不同土质上表现为粘土最高,壤土次之,砂土最低,且分别在P600、P300、P600处理时达到最大值。不同磷水平下,磷肥表观利用率在3种土壤质地上表现不同,粘土、壤土、砂土分别在P150、P300、P600时达到最大值,与P0相比分别提高了16.84%、29.19%、10.68%。同一磷水平下不同土壤质地磷素生理利用率表现为砂土壤土粘土。因此,在生产中应针对土壤质地合理施磷,粘土土质下棉田施磷量应控制在约150 kg/hm~2,壤土土质应控制在150~300 kg/hm~2,砂土土质施磷量总体应控制在300~600 kg/hm~2,才能促进土壤中磷的有效性和棉花磷素吸收,从而提高磷肥利用率。 相似文献
14.
15.
Gross phosphorus (P) fluxes measured in isotopic dilution studies with 33P labeled soils include the biological processes of microbial P immobilization, remineralization of immobilized P and mineralization of non-microbial soil organic P. In this approach, isotopic dilution due to physicochemical processes is taken into account. Our objectives were to assess the effect of inorganic P availability on gross P mineralization and immobilization in soil under permanent grassland, and to relate these fluxes to soil respiration, phosphatase activity and substrate availability as assessed by an enzyme addition method. We used soils from an 18-year-old grassland fertilization experiment near Zurich, Switzerland, that were collected in two treatments which differed only in the amount of mineral P applied (0 and 17 kg P ha−1 yr−1 in NK and NPK, respectively). Water-extractable phosphate was low (0.1 and 0.4 mg P kg−1 soil in NK and NPK, while hexanol-labile (microbial) P was high (36 and 54 mg P kg−1 soil in NK and NPK). Extremely fast microbial P uptake under P-limited conditions in NK necessitated the use of a microbial inhibitor when determining isotopic dilution due to physicochemical processes. At the higher inorganic P availability in NPK, however, isotopic exchange parameters were similar in the presence and absence of a microbial inhibitor. Phosphatase activity was higher in NK than in NPK, while soil respiration, water-extractable organic P and its enzyme-labile fraction were not affected by P status. Together, the results showed that inorganic P availability primarily affected microbial P immobilization which was the main component of gross P fluxes in both treatments. Gross P mineralization rates (8.2 and 3.1 mg P kg−1 d−1 for NK and NPK) during the first week were higher than reported in other studies on arable and forest soils and at least equal to isotopically exchangeable P due to physicochemical processes, confirming the importance of microbial processes in grassland soils. 相似文献
16.
Y. T. Wang T. Q. Zhang I. P. O'halloran C. S. Tan Q. C. Hu 《Soil Use and Management》2016,32(1):60-68
The dependence of runoff dissolved reactive phosphorus (DRP) loss on soil test P or rapid estimations of degree of P saturation (DPS) often varies with soil types. It is not clear whether the soil‐specific nature of runoff DRP versus DPS is due to the different sorption characteristics of individual soils or the inability of these rapid DPS estimates to accurately reflect the actual soil P saturation status. This study aimed to assess environmental measures of soil P that could serve as reliable predictors of runoff DRP concentration by using soils collected from Ontario, Canada, that cover a range of chemical and physical properties. A P sorption study was conducted using the Langmuir equation to describe amount of P sorbed or desorbed by the soil (Qs, mg/kg) versus equilibrium P concentration (C, mg/L) in solution, where Qmax is P sorption maximum (mg/kg), k represents P sorption strength (L/mg), and Q0 (mg/kg) is the P sorbed to soil prior to analysis. Runoff DRP concentration increased linearly with increasing DPSsorp (i.e. the ratio of (Q0 + QD)/Qmax) following a common slope value amongst soil types, while the P buffering capacity (PBC0) at C = C0 yielded a common change point, below which runoff DRP concentration decreased greatly with increasing PBC0 compared to that above the change point, where C0 and QD represent the equilibrium P concentration and amount of P desorbed, respectively. Both DPSsorp and PBC0 showed great promises as indicators of runoff DRP concentration. 相似文献
17.
《Communications in Soil Science and Plant Analysis》2012,43(6):717-729
Abstract A study was conducted to evaluate the use of P vectors to predict the amount of P required on a yearly basis to maintain a constant solution‐solid phase P relationship in an irrigated calcareous and a dryland acid soil. Irrigated potato‐spring barley and dryland spring pea spring‐barley crop rotations established at the two locations. Mono‐calcium phosphate (0–45–0) was applied annually at five levels, ranging from 0–4 times estimated crop removal. Phosphorus vectors were determined on soil samples by equilibration with standard P solutions. Yields tended to increase with added P on the calcareous soil; however, significant responses were not recorded at either location. Consequently, critical P vectors were not established. A constant solution‐solid phase P relationship was maintained by addition of P equal to that removed by the crop on the calcareous soil. A constant solution‐solid phase P relationship was not maintained on the acid soil. 相似文献
18.
《Communications in Soil Science and Plant Analysis》2012,43(8):1127-1139
Abstract The rates of applied phosphorus required for 90% maximum yield of Desmodiim intortum cv. Greenleaf were calculated from pot experiments using 24 fertilized and unfertilized soils from the Atherton Tableland, Queensland, Australia. Phosphorus required was highly correlated (r2 = 0.94) with the phosphorus sorbed (P sorbed) by the soils at a supernatant solution P concentration of 0.08 ppm. P sorbed was found to be a function of phosphorus buffer capacity at 0.08 ppm ("PBC") and phosphorus extractable by acid (0.005 M H2S04) or bicarbonate (0.5 M NaHCO3). PBC was highly correlated (r2 = O.84) with a phosphorus sorption index ("PSI") derived from one addition of 500 μg P g‐1 soil. Combining PSI with acid or bicarbonate extractable P in a multiple regression equation allowed the estimation of phosphorus required with multiple correlation coefficients of R2 = 0.80 and R2 = 0.83 respectively. 相似文献
19.
P. J. A. Withers H. Hartikainen E. Barberis N. J. Flynn G. P. Warren 《European Journal of Soil Science》2009,60(6):994-1004
Accumulation of surplus phosphorus (P) in the soil and the resulting increased transport of P in land runoff contribute to freshwater eutrophication. The effects of increasing soil P (19–194 mg Olsen‐P (OP) kg−1) on the concentrations of particulate P (PP), and sorption properties (Qmax, k and EPCo) of suspended solids (SS) in overland flow from 15 unreplicated field plots established on a dispersive arable soil were measured over three monitoring periods under natural rainfall. Concentrations of PP in plot runoff increased linearly at a rate of 2.6 μg litre−1 per mg OP kg−1 of soil, but this rate was approximately 50% of the rate of increase in dissolved P (< 0.45 μm). Concentrations of SS in runoff were similar across all plots and contained a greater P sorption capacity (mean + 57%) than the soil because of enrichment with fine silt and clay (0.45–20 μm). As soil P increased, the P enrichment ratio of the SS declined exponentially, and the values of P saturation (Psat; 15–42%) and equilibrium P concentration (EPCo; 0.7–5.5 mg litre−1) in the SS fell within narrower ranges compared with the soils (6–74% and 0.1–10 mg litre−1, respectively). When OP was < 100 mg kg−1, Psat and EPCo values in the SS were smaller than those in the soil and vice‐versa, suggesting that eroding particles from soils with both average and high P fertility would release P on entering the local (Rosemaund) stream. Increasing soil OP from average to high P fertility increased the P content of the SS by approximately 10%, but had no significant (P > 0.05) effect on the Psat, or EPCo, of the SS. Management options to reduce soil P status as a means of reducing P losses in land runoff and minimizing eutrophication risk may therefore have more limited effect than is currently assumed in catchment management. 相似文献