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Rehabilitación de un suelo salino con yeso agrícola en un cultivo de nogal en el Valle del Yaqui 在雅基山谷的一个核桃园用农业石膏修复盐碱地
Q4 AGRONOMY Pub Date : 2018-01-22 DOI: 10.28940/terra.v36i1.310
Alma María Trasviña Barriga, Rafael Borquez Olguin, José Leal Almanza, L. Espinoza, M. A. G. Coronado
Pecans are cultivated extensively in the Yaqui Valley, Sonora. These soils often have problems of salinity and high concentrations of exchangeable sodium, which cause a decline in pecan productivity. At the end of the season of irrigation with water from the system of reservoirs on the Yaqui River, groundwater is generally used from May to August. This can result in salt accumulation in the soil when water is of poor quality. Gypsum has been used as an amendment to rehabilitate soil by improving its physical and chemical properties. The main objective of this study was to investigate the effect of gypsum application to a saline soil of a pecan orchard in the Yaqui Valley. Rehabilitation was carried out for two consecutive years. In the first year a dose of 5 and 10 Mg ha‑1 was applied, while in the second year 2 Mg ha‑1 of gypsum was used. Two ridge washings were done after each aplication. The physico-chemical analyses of the soil were conducted following NOM-021-RECNAT-2000 during three years prior to and after the applications of amedment. Once the amendement was applied, the values of electrical conductivity decreased from 12.41 to 6.29 dS m-1, percentage of exchangeable sodium from 12.48 to 5.57 and sodium adsorption ratio from 10.54 to 4.88 at the depth of 0-30 cm. The use of agricultural gypsum and washing in a saline soil of the pecan orchard improved soil chemical properties using 5 and 10 Mg ha-1.
山核桃在索诺拉的雅基山谷被广泛种植。这些土壤经常有盐碱化和交换性钠浓度高的问题,这导致山核桃产量下降。崖溪河水库系统灌溉季节结束后,一般在5 - 8月使用地下水。当水质差时,这可能导致土壤中盐的积累。石膏作为一种改良剂,通过改善土壤的物理和化学性质来修复土壤。本研究的主要目的是研究石膏在雅桂河谷山核桃园盐碱地上的施用效果。康复工作连续进行了两年。第一年分别使用5和10 Mg ha - 1,第二年使用2 Mg ha - 1的石膏。每次应用后进行两次脊洗。采用nom -021- recat -2000对土壤进行了理化分析,前后三年进行了改良。在0 ~ 30 cm深度,电导率由12.41降至6.29 dS - m-1,交换钠率由12.48降至5.57,钠吸附比由10.54降至4.88。在山核桃园盐碱土中使用5和10 Mg ha-1的农业石膏和洗涤改善了土壤的化学性质。
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引用次数: 8
Bi-conical reflectance factor in contrasting vegetal species: global modeling 对比植物物种的双锥反射因子:全球模拟
Q4 AGRONOMY Pub Date : 2018-01-22 DOI: 10.28940/TERRA.V36I1.222
F. P. Pellat, A. Cano, M. Bolaños, J. Chávez, M. Marin, E. Romero
La clasif icacion de la vegetacion usando informacion espectral multi-angular ha sido aproximada con esquemas de modelacion restringidos o con hipotesis de homogeneidad o estacionariedad. En este trabajo se presenta un esquema de modelacion global de los angulos cenitales y acimutales en la reflectancia de la vegetacion, extendiendo los desarrollos al caso de los efectos de cambios en las propiedades opticas del fondo de la vegetacion (suelos) y de la densidad de plantas (follaje). Esta sintesis se realiza en un espacio superior de compactacion que depende esencialmente de dos parametros y engloba todas las variaciones analizadas. El esquema de modelacion global desarrollado se aplico al caso de arreglos de plantas, diferentes densidades de ocho especies con arquetipos contrastantes y suelos desnudos. La modelacion se aplico a las mediciones de factores de reflectancia bi-conicos, donde los ajustes resultaron optimos (generalmente con R2 ≥ 0.99 y errores relativos medios menores al 7%). El analisis de los resultados mostro que la informacion espectral multi-angular para clasif icacion de especies, bajo condiciones generalizadas, mantiene todavia problemas de confusion en la discriminacion de especies. Esto puede explicarse por la sintesis de analisis realizada de las variaciones asociadas a la discriminacion.
利用多角光谱信息对植被进行分类,采用受限模型或均匀性或平稳性假设。本文提出了植被反射率的天顶角和方位角的全球建模方案,扩展了植被背景(土壤)和植物密度(叶子)光学特性变化的影响。这种合成是在上压实空间中进行的,主要依赖于两个参数,并包含所有分析的变化。本文提出了一种方法,通过对不同物种的不同密度、不同的原型和裸露的土壤进行建模。该模型应用于双锥反射因子的测量,其中调整是最优的(通常R2≥0.99,平均相对误差小于7%)。本文的目的是评估物种分类的多角度光谱信息对物种识别的影响,并评估其对物种分类的影响。这可以用与鉴别相关的变异分析的综合来解释。
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引用次数: 1
Correcciones atmosféricas relativas de imágenes de satélite: patrones invariantes y modelos atmosféricos 卫星图像的相对大气校正:不变模式和大气模式
Q4 AGRONOMY Pub Date : 2018-01-22 DOI: 10.28940/terra.v36i1.228
Fernando Paz Pellat
To use information obtained with satellite technology reliably, it is necessary to eliminate or reduce the disruptive effects associated with the spectral information captured by sensors on space platforms. In this paper we analyze the inversion of radiative models of the atmosphere, which consists in determining the additive and multiplicative constants in each spectral band to make the necessary atmospheric corrections. The methodology proposes the use of invariant patterns of soil lines and dense vegetation for the inversion of radiative models. The results showed that, without knowledge of the atmospheric model or the type of aerosol, soil line data were relatively insufficient (low correlation) to obtain the additive and multiplicative constants of the atmospheric inversions, with problems of multiple solutions in the inversion process. Under similar conditions, the same was found for additive constants with the dense vegetation line, but for the multiplicative constants the results were favorable (R2 > 0.9). In contrast, with the knowledge of the atmospheric model and the aerosol model, estimates of additive and multiplicative constants were highly satisfactory (R2 > 0.99) in both cases. For soil line inversions, only one constraint of the two available was used. In conclusion, the use of invariant soil-line patterns allows us to establish two basic relationships to invert the radiative simulations of the atmosphere, prior to functional compaction, and field measurements can be made so that the proposed atmospheric correction process in this work can be considered in absolute and not relative terms.
为了可靠地利用卫星技术获得的信息,有必要消除或减少与空间平台上传感器捕获的光谱信息相关的破坏性影响。本文分析了大气辐射模式的反演,即确定各光谱波段的加性常数和乘性常数,以进行必要的大气校正。该方法建议使用土壤线和茂密植被的不变模式进行辐射模型的反演。结果表明,在不了解大气模式或气溶胶类型的情况下,土壤线数据相对不足(相关性较低),无法获得大气逆温的加性和乘性常数,在反演过程中存在多解问题。在相同条件下,植被密集线的加性常数也具有相同的结果,而乘性常数则具有较好的结果(R2 > 0.9)。相比之下,利用大气模式和气溶胶模式的知识,对两种情况下的加性常数和乘性常数的估计是非常令人满意的(R2 > 0.99)。对于土壤线反演,仅使用两个可用约束中的一个。总之,使用不变土壤线模式使我们能够在功能压实之前建立两种基本关系来反演大气的辐射模拟,并且可以进行现场测量,从而可以绝对而不是相对地考虑本工作中提出的大气校正过程。
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引用次数: 2
Actividad microbiológica y biomasa microbiana en suelos cafetaleros de los Andes venezolanos 委内瑞拉安第斯山脉咖啡土壤的微生物活性和微生物生物量
Q4 AGRONOMY Pub Date : 2018-01-22 DOI: 10.28940/TERRA.V36I1.257
J. Gómez
En Venezuela el cafe ( Coffea arabica L.) ocupa un area aproximada de 200 000 ha, distribuidos principalmente en las zonas montanosas de Los Andes. Tradicionalmente, el cafe se cultiva con pocos insumos bajo la sombra de arboles de la familia de las leguminosas y de otros arbustos. En anos recientes con la adopcion de cultivares de alta productividad, notable precocidad y tamano reducido se esta produciendo cafe a plena exposicion solar con fertilizacion mineral y uso de pesticidas. Las propiedades microbiologicas del suelo especialmente aquellas relacionadas con el flujo de energia y el reciclaje de nutrientes responden de forma rapida y sensible a los cambios de las condiciones del suelo mucho antes que por ejemplo el carbono organico, y de este modo, suministran una informacion anticipada sobre las alteraciones de la calidad del mismo. En este estudio se comparo la actividad microbiologica (respiracion basal), la biomasa microbiana y los parametros ecofisiologicos en suelos a nivel superficial (0-5 cm) de ocho fincas cafetaleras en los municipios de Merida y Trujillo donde se encuentran tres sistemas de produccion: tradicional, convencional y organico. Las fincas con agricultura organica presentaron los mayores valores de carbono organico total, carbono hidrosoluble, respiracion basal y biomasa microbiana en comparacion con las de manejo tradicional y convencional; con lo cual la produccion organica es un sistema de manejo mas sostenible por la mayor conservacion de los recursos naturales y la produccion mas amigable y armonica con el ambiente. En el caso del manejo convencional, la adicion de fertilizantes y pesticidas afecta de forma negativa el bienestar de los microorganismos y los hace mas ineficientes en el uso del carbono y la energia.
在委内瑞拉,咖啡(Coffea arabica L.)占地约20万公顷,主要分布在安第斯山脉的山区。传统上,咖啡是在豆科和其他灌木的树荫下用很少的投入种植的。近年来,随着高产品种的采用,显著的早熟和缩小尺寸,咖啡生产完全暴露在阳光下,矿物肥料和使用杀虫剂。土壤特性microbiologicas特别是有关养分与能量流动和循环利用快速地响应变化敏感的土壤条件远远早于例如organico碳,从而预先信息,提供关于水质改变自己。本研究比较了梅里达和特鲁希略市8个咖啡农场的表层土壤(0-5 cm)的微生物活性(基础呼吸)、微生物生物量和生态生理参数,这些农场有三种生产系统:传统、传统和有机。与传统和常规管理相比,有机农业农场的总有机碳、水溶性碳、基础呼吸和微生物生物量均较高;因此,有机生产是一种更可持续的管理系统,更大程度地保护自然资源,生产更友好,与环境和谐。在传统管理的情况下,化肥和杀虫剂的添加对微生物的健康产生了负面影响,使它们在碳和能源的使用效率更高。
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引用次数: 26
Familias de agua subterránea y distribución de sólidos totales disueltos en el acuífero de La Paz Baja California Sur, México 墨西哥南下加利福尼亚拉巴斯含水层的地下水家庭和总溶解固体分布
Q4 AGRONOMY Pub Date : 2018-01-22 DOI: 10.28940/TERRA.V36I1.316
A. Falcón, E. T. Diéguez, Janette Magalli Murillo Jiménez, J. G. Hernández, B. M. Amador
El acuifero de La Paz se encuentra desde hace varios anos en condicion de sobreexplotacion, lo que ha causado problemas de contaminacion por intrusion marina. En 2013 se conformo una red de monitoreo de pozos, que incluyo el uso publico-urbano, agricola, pecuario y de servicios, donde se realizaron muestreos representativos de la temporada de estiaje y lluvias. Se midio la concentracion de solidos totales disueltos (STD), temperatura, oxigeno disuelto y pH. Los resultados mostraron que la mayoria de los pozos agricolas contenian alta concentracion de STD a diferencia de los pozos de agua potable con concentracion inferior a 1000 mg L-1, que es el limite permisible por la norma of icial mexicana (NOM). Tambien se analizaron datos de iones mayoritarios de 14 pozos cercanos a la costa con alta concentracion de STD, con los que se elaboro un diagrama de Piper, encontrandose dos tipos o familias principales de agua: clorurada-calcica y clorurada-sodica. La presencia de sodio en concentraciones que superan los 200 mg L-1 en 8 pozos, y de magnesio con mas de 50 mg L-1 en 10 pozos, sobrepasaron la NOM y se considero que su origen es marino. La concentracion de calcio mayor a los 250 mg L-1 en 7 pozos, supone la existencia de capas de sedimentos de origen quimico-organico en la estratigrafia interior del acuifero, a traves de las cuales circula el agua subterranea. Los cloruros en concentraciones superiores a los 1000 mg L-1 en 6 pozos con elevada concentracion de STD, sugiere que es producto de la intrusion marina. Con base en la distribucion de la concentracion de STD se delimitaron dos areas amplias afectadas por la intrusion marina, y junto con la distribucion de las familias de agua, se identif icaron tres zonas principales del acuifero.
拉巴斯含水层多年来一直处于过度开采的状态,这造成了海洋入侵造成的污染问题。2013年,建立了一个水井监测网络,包括公共城市、农业、畜牧业和服务用途,并在旱季和雨季进行了代表性抽样。midio总浓度锻炼自己完全的溶解(STD)、温度、氧气排放和ph .结果显示,大多数水井agricolas涵盖高浓度锻炼STD饮用水井与不同浓度锻炼低于1000毫克升,是限制允许墨西哥icial (NOM规范)。我们还分析了14口高STD浓度的近海井的大部分离子数据,并绘制了Piper图,发现了两种主要的水类型:氯化钙和氯化钠。8口井中钠浓度超过200 mg L-1, 10口井中镁浓度超过50 mg L-1,超过NOM,认为其来源为海洋。7口井的钙浓度大于250 mg L-1,假设在含水层内部地层中存在化学-有机成因的沉积物层,地下水通过这些沉积物循环。在6口STD浓度高的井中,氯化物浓度超过1000 mg L-1,表明它是海洋入侵的产物。根据性病浓度的分布,划定了受海洋侵入影响的两个大区域,并结合水族的分布,确定了含水层的三个主要区域。
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引用次数: 7
Respuesta de variedades de maíz (Zea mays L.) a diferentes fuentes de fertilización en el Valle de Puebla 普埃布拉山谷玉米品种对不同施肥来源的响应
Q4 AGRONOMY Pub Date : 2018-01-22 DOI: 10.28940/terra.v36i1.309
Rafael Alvarado Teyssier, E. A. Ruíz, Juan de Dios Guerrero Rodríguez, José Isabel Olvera Hernández, Ángel Bustamante González, Samuel Vargas López, J. H. H. Salgado
Nowadays, there are biologically sustainable options that can partially replace synthetic fertilizers and reduce production costs. To test the response of 18 maize varieties to synthetic fertilization (FQ), synthetic fertilization plus inoculant (FQB) and synthetic fertilization plus compost (FQC), in 2010 two experiments were established in rainfed conditions in the Valley of Puebla, with a completely randomized design, under a split plots arrangement, with three replications. Type of fertilization was assigned to the main plot and maize genotypes were the split plot. No differences were found in grain and stover yield by type of fertilization. There was a strong interaction between varieties and type of fertilizer as well as between varieties and location in grain and stover yield. For the interaction between variety and type of fertilization, it was found that 56% of the varieties showed higher yields with FQC, in while 27.8% had higher yields with FQB and 16.7% yielded better with FQ. The highest stover yield was obtained in San Andres Calpan with FQC (8.8 Mg ha-1), while in San Pedro Tlaltenango it was obtained with FQB (15.3 Mg ha‑1) and FQ (15.4 Mg ha‑1). The use of both synthetic fertilization and inoculant or compost maintains and increases maize grain and stover yield, compared with using only synthetic fertilizer.
如今,有生物可持续的选择,可以部分取代合成肥料,降低生产成本。为研究18个玉米品种对合成施肥(FQ)、合成施肥+接种剂(FQB)和合成施肥+堆肥(FQC)的响应,于2010年在普埃布拉谷旱作条件下,采用完全随机设计,分畦布置,3个重复。施肥类型为主地块,玉米基因型为分块地块。不同施肥方式对籽粒和秸秆产量无显著影响。在籽粒和秸秆产量方面,品种与肥料类型之间、品种与地点之间存在较强的相互作用。在品种与施肥类型的互作中,56%的品种FQC增产,27.8%的品种FQB增产,16.7%的品种FQB增产。在San Andres Calpan, FQC (8.8 Mg ha-1)获得最高的秸秆产量,而在San Pedro Tlaltenango, FQB (15.3 Mg ha-1)和FQ (15.4 Mg ha-1)获得最高的秸秆产量。与只使用合成肥料相比,同时使用合成肥料和接种剂或堆肥可以保持和增加玉米籽粒和秸秆的产量。
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引用次数: 0
Minimización de los efectos atmosféricos en el índice espectral de la vegetación IVIS 尽量减少大气对IVIS植被光谱指数的影响
Q4 AGRONOMY Pub Date : 2018-01-22 DOI: 10.28940/TERRA.V36I1.230
Fernando Paz Pellat
It is essential to minimize atmospheric effects on spectral information of remote sensors from space platforms to avoid under estimation of biophysical variables associated with satellite image data. In this paper, a generic algorithm was developed, based on sound theoretical arguments, to analyze time series ISVI spectral vegetation index (vegetation index based on iso-soil curves), thus avoiding the problems associated with the classic design of vegetation indices, where the spectral signal saturates quickly. The results, when applying the algorithm in pixel time series of AVHRR satellite images, showed that reduction and standardization of atmospheric effects in the ISVI was achieved. Using ISVI maximum values in time series (temporal window), a reasonable approximation to atmospheric conditions with minimum or standardized effects was obtained. In conclusion, although the scheme developed failed to eliminate the atmospheric effect on ISVI entirely, it was reduced to a minimum. The algorithm developed was simple enough for operational use, with regard to atmospheric correction methods using radiative model inversions.
必须尽量减少大气对空间平台遥感器光谱信息的影响,以避免低估与卫星图像数据相关的生物物理变量。本文基于良好的理论论证,开发了一种通用算法,用于分析时间序列ISVI光谱植被指数(基于等土曲线的植被指数),从而避免了传统植被指数设计中光谱信号迅速饱和的问题。将该算法应用于AVHRR像元时间序列的结果表明,该算法实现了ISVI大气效应的降低和标准化。利用时间序列(时间窗)的ISVI最大值,得到了具有最小效应或标准化效应的大气条件的合理近似值。综上所述,虽然所制定的方案未能完全消除大气对ISVI的影响,但它已减少到最低限度。对于使用辐射模式反演的大气校正方法,所开发的算法足够简单,可用于操作。
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引用次数: 0
Corrección de la clorosis férrica con quelato EDDHA en cultivos sembrados en suelo alcalino y calcáreo Corrección de la clorosis férrica明媚quelato EDDHA en cultivos sembrados en suelo alcalino y calcá合唱团
Q4 AGRONOMY Pub Date : 2018-01-22 DOI: 10.28940/TERRA.V36I1.254
A. Franco, M. E. Ramírez, Flor Elena Ortiz Cháirez
La def iciencia de hierro (Fe) en los cultivos se manif iesta principalmente en regiones con suelos alcalinos y calcareos. En el presente estudio se evaluo la efectividad del Fe3+ quelatado con EDDHA [ac. etilendiamino di-(o-hidroxifenilacetato)] y la aspersion foliar de FeSO4 solos y combinados, en los cultivos de sorgo, soya, okra y frijol. El EDDHA-Fe (Ultraferro®) se aplico a dosis de 1% en la siembra sobre las semillas y para el FeSO4 se hicieron dos aplicaciones foliares al 1.5%. En los cuatro experimentos se determino el indice de clorof ila (SPAD) en tres fechas (15 y 28 de marzo, 6 de abril), y a los 48-50 dias despues de la siembra se cuantif ico la biomasa foliar y radical. Entre los cultivos, las plantas de soya y okra manifestaron la mayor intensidad de clorosis ferrica, la cual fue visible entre los tratamientos. En ambos cultivos los mayores valores SPAD y de biomasa foliar y radical se obtuvieron con la aplicacion de EDDHA-Fe solo o combinado con FeSO4. En frijol y sorgo, la clorosis fue menos visible, para las plantas de frijol el mayor indice de clorof ila se registro con EDDHA-Fe y FeSO4 en las dos ultimas fechas de evaluacion (28 de marzo y 6 de abril) y los tres tratamientos quimicos superaron de forma similar al testigo, en la biomasa foliar y radical. Las plantas de sorgo registraron los mayores indices SPAD en la ultima fecha (6 de abril), mientras que no fueron signif icativas las diferencias en la biomasa foliar y radical. No se observo efecto aditivo en las variables con la combinacion EDDHA-Fe y FeSO4. En general, los resultados indican que la aplicacion de EDDHA-Fe solo o combinado con FeSO4 foliar en soya, okra y frijol, mostraron correccion de la clorosis ferrica de manera efectiva.
作物中的铁(Fe)溶解主要发生在碱性和钙质土壤地区。Fe3+螯合EDDHA [ac.乙二胺二(o-羟基苯基乙酸酯)]和FeSO4单独或联合叶面喷洒在高粱、大豆、秋葵和豆类上的效果。edda - fe (Ultraferro®)在播种时以1%的剂量施用,FeSO4在叶片上以1.5%的剂量施用。在4个试验中,测定了3个日期(3月15日、28日和4月6日)的氯指数(SPAD),并在播种后48-50 d量化了叶片和根系生物量。在作物中,大豆和秋葵的铁褪绿强度最高,在处理之间可见。结果表明,edda - fe单独施用或与FeSO4联合施用均能提高叶片生物量和根系生物量。在、高梁、绿是不太显眼,为植物攀援clorof代表作指数最多记录与EDDHA-Fe FeSO4两个最新evaluacion日期(3月28日和4月6日)和三个疗程及超过同样激进的证人,在页和生物量。高粱植株的SPAD指数在最后一天(4月6日)最高,叶生物量和根系生物量差异不显著。edda - fe和FeSO4组合对变量没有显著的加性影响。结果表明,edda - fe单独施用或与FeSO4联合施用大豆、秋葵和豆类均能有效纠正铁褪绿病。
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引用次数: 0
Fundamentação teórica dos sistemas de amostragem de solo de acordo com a variabilidade de características químicas. 根据化学特性变异性的土壤取样系统的理论基础。
Q4 AGRONOMY Pub Date : 2017-10-08 DOI: 10.28940/TERRA.V35I4.172
M. AndréGuarçoni, V. Alvarez, Fabrício Moreira Sobreira
Due to high variability of chemical characteristics, soil sampling is one of the major sources of error in a correction and fertilization program. This critical review aimed to analyze the theoretical foundations that define the soil sampling types used for different cropping systems, assessing the degree of influence of variations in chemical characteristics conferred by each situation. Confronting information from the studies reviewed, we determined that the range of spatial dependence of soil chemical properties is dependent on the distance between previous sampling points. Land stratification in sampling units reduces the occurrence of spatial dependence caused by environmental factors associated with long-distance variations (macro-dependence), but does not prevent the occurrence of spatial dependence at short distances in positions within the stratum itself (meso-dependence). The option to use composite sample analysis from homogeneous field (average fertility) or the soil fertility maps for recommendation of lime and fertilizer, is primarily due to economic issues. The collection of single samples of small volume to calculate local averages, or the formation of composite samples from these “single samples” tends to increase the effectiveness and reliability of fertility maps.
由于化学特性的高度可变性,土壤取样是校正和施肥计划中误差的主要来源之一。这篇重要的综述旨在分析定义不同种植制度所使用的土壤取样类型的理论基础,评估每种情况所赋予的化学特征变化的影响程度。面对研究回顾的信息,我们确定土壤化学性质的空间依赖范围取决于以前采样点之间的距离。采样单位的土地分层减少了与长距离变化相关的环境因素引起的空间依赖性(宏观依赖性),但不能防止地层本身位置短距离上的空间依赖性(中观依赖性)的发生。选择使用同质田的复合样本分析(平均肥力)或土壤肥力图来推荐石灰和肥料,主要是由于经济问题。收集小体积的单一样本来计算当地平均值,或从这些“单一样本”中形成复合样本,往往会提高生育率图的有效性和可靠性。
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引用次数: 5
Clasificación digital de suelos a través de covariables ambientales de la cuenca del río Mixteco 利用米斯特克河流域环境协变量对土壤进行数字分类
Q4 AGRONOMY Pub Date : 2017-10-08 DOI: 10.28940/TERRA.V35I4.264
G. García, D. S. F. Reynoso, M. R. M. Menez, J. D. R. Berber, Patricio Sánchez Guzmán, Erasmo Rubio Granados, L. A. I. Castillo
The lack of detailed maps of spatial distribution of soil units is a frequent constraint in decision-making processes, hydrological modeling, and productive assessment of an area. In this work, the Digital Soil Mapping (DSM) technique was applied, and Principal Component Analysis (PCA) was used to obtain the spatial distribution of dominant soil units in a watershed. The study area was the Mixteco watershed, which covers an area of 655 903 ha, of the Mexican state of Oaxaca. For DSM, topographic, hydrological, climatic and geological environmental covariables were used. The environmental covariables with greater impact on the spatial distribution of soil units, in order of importance, were geological, topographic and climatic. Digital classification was based on 142 randomly distributed training areas and 60 sites for validation of results. In the watershed, according to the FAO (2014) WRB Classif ication System, the following soil groups were identified satisfactorily (76.67% for overall accuracy and 71.20% for the kappa index): Cambisols (35.8%), Fluvisols (7.16%), Leptosols (48.25%), Regosols (8.00%) and Vertisols 0.79%). DSM satisfactorily determined the spatial distribution of soil units in the watershed and identified the most influential environmental covariables.
缺乏土壤单元空间分布的详细地图是决策过程、水文建模和一个地区的生产性评估中经常出现的制约因素。本研究采用数字土壤制图(DSM)技术,利用主成分分析(PCA)获得流域优势土壤单元的空间分布。研究区域是墨西哥瓦哈卡州的Mixteco流域,面积为655 903公顷。对于DSM,使用了地形、水文、气候和地质环境协变量。对土壤单元空间分布影响较大的环境协变量依次为地质、地形和气候。数字分类基于142个随机分布的训练区域和60个验证结果的站点。在流域内,根据FAO (2014) WRB分类系统,对Cambisols(35.8%)、Fluvisols(7.16%)、Leptosols(48.25%)、Regosols(8.00%)和versols(0.79%)土壤类群进行了满意的识别(总体准确率76.67%,kappa指数71.20%)。DSM令人满意地确定了流域土壤单元的空间分布,并确定了最具影响力的环境协变量。
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引用次数: 2
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Terra Latinoamericana
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