EFFECT OF LAND USE CHANGE ON INORGANIC PHOSPHORUS POOLS IN LOESS DERIVED SOILS OF THE TOSHAN REGION, GOLESTAN PROVINCE

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TAJARI S.; BARANIMOTLAGH M.; KHORMALI F.; KIANI F.

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Journal: Journal of Water and Soil Year:2015 | Volume:29 | Issue:2 Page(s): 453-465

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Title

EFFECT OF LAND USE CHANGE ON INORGANIC PHOSPHORUS POOLS IN LOESS DERIVED SOILS OF THE TOSHAN REGION, GOLESTAN PROVINCE

Author(s)

TAJARI S. | BARANIMOTLAGH M. | KHORMALI F. | KIANI F. | Issue Writer Certificate

Keywords

INORGANIC P.Q2

LAND USEQ1

PHOSPHORUS FRACTIONATIONQ2

SEQUENTIAL EXTRACTIONQ2

Abstract

Introduction: P in soils exists in many complex chemical forms, which differ markedly in their behavior, mobility and resistance to bioavailability in the soils. The total P content of a soil provides little informationregarding the behavior of P in the environment. The various forms of P present to a large degree, determine thefate and transport of P in soils. Fractionation schemes using different chemical SEQUENTIAL EXTRACTIONs have beenused in order to describe the many different forms in which P can be found in the soil. The reason forfractionating and studying P forms in the soil is usually to allow a more precise description of the potentials for Prelease from the soil. The forms and dynamics of soil P can be greatly affected by agricultural managementpractices. Since INORGANIC P.is the preferred source for plant uptake, knowledge of the inorganic form withinsoils is fundamental to understanding bioavailability of P and sustainability of agricultural practice. The aim ofthis study was to investigate the effect of LAND USE change on the form and distribution of INORGANIC P.using asequential extraction procedure.Materials and Methods: In order to study the impact of land-use change from forestland to cultivated land, composite samples in four replicates from the upper 10 cm of the different LAND USE systems (natural forest, pasture, bower olive, farmland) were collected. We collected five subsamples from each LAND USE in a radialsampling scheme. The five subsamples were then bulked into one sample. The spacing between the subsampleson the radii ranged from 5 to 10 m. The soil samples were transferred to polyethylene bags and transported to thelaboratory where they were slightly crushed, passed through a 2 mm sieve prior to fractionation and chemicalanalysis. Soil texture, cation exchange capacity, organic carbon (OC), electrical conductivity, pH and calciumcarbonate equivalent (CCE) were measured with standard methods. Total P and total INORGANIC P.(Pi) contentswere measured by the ignition method, for which P in the ignited (550oC) and unignited soil samples wereextracted by 0.5 M H2SO4. A modified version of the SEQUENTIAL EXTRACTION of Olsen and Sommers (1982) wasused to fractionate INORGANIC P. Phosphorus was measured in the extracted supernatants by the molybdate–ascorbic acid method.Results and Discussion: The results showed that clear-cutting of the indigenous forests and their conversioninto agricultural fields significantly decreased total P and total organic P levels. Land-use changes from naturalforest to farmland decreased the total P by 23% (from 644 to 495 mg per kg). Clearing and subsequentcultivation of the native woodland resulted in a marked depletion of total organic P. In addition, the land-useconversion from the natural forestland to an agroecosystem (cultivated land) led to increases in total INORGANIC P.nd INORGANIC P.forms levels (labile P, P non-occluded, occluded in oxides of iron and aluminum, solublecalcium phosphate and sparingly soluble calcium phosphate). Labile INORGANIC P.(NaHCO-Pi) showed thegreatest changes, such as labile INORGANIC P.in the amount of change from 1.75 in the forest land to 13.01 mg perkg of cultivated land, which represent an increase of approximately 8-fold compared to control (natural forest).The results also revealed that the refractory INORGANIC P.fractions (HCl-Pi) were the major INORGANIC P.pool, comprising 50-70% of the total INORGANIC P.pool, indicating CaCO3 control over phosphorus availability in thestudied soils. This study indicated that forestland degradation and cultivation caused chemical changes of Pdynamics.Conclusion: Large-scale conversion of indigenous forests to cultivated land, driven by long-term agriculturaldevelopment in the Toshan region, has greatly impacted the forms and content of P in the soils. Generally, theconversion of natural ecosystem to agroecosystems, decreased the proportion of organic P (Po) in the top-soils atdepth of 0 to 10 cm. The depletion in organic P from the cropped fields could be attributed to the enhancedmineralization of soil organic P caused by cultivation and removal of P in the crops. However, the conversion ofnatural forest to farmland led to increases in INORGANIC P.(Pi). About 50% to 70% of the TP was bound to CaCO3, and thus this solid phase is critical to P fate in the soils and ecosystem of the Toshan Region, Golestan province.

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APA: Copy

TAJARI, S., BARANIMOTLAGH, M., KHORMALI, F., & KIANI, F.. (2015). EFFECT OF LAND USE CHANGE ON INORGANIC PHOSPHORUS POOLS IN LOESS DERIVED SOILS OF THE TOSHAN REGION, GOLESTAN PROVINCE. JOURNAL OF WATER AND SOIL (AGRICULTURAL SCIENCES AND TECHNOLOGY), 29(2), 453-465. SID. https://sid.ir/paper/141073/en

Vancouver: Copy

TAJARI S., BARANIMOTLAGH M., KHORMALI F., KIANI F.. EFFECT OF LAND USE CHANGE ON INORGANIC PHOSPHORUS POOLS IN LOESS DERIVED SOILS OF THE TOSHAN REGION, GOLESTAN PROVINCE. JOURNAL OF WATER AND SOIL (AGRICULTURAL SCIENCES AND TECHNOLOGY)[Internet]. 2015;29(2):453-465. Available from: https://sid.ir/paper/141073/en

IEEE: Copy

S. TAJARI, M. BARANIMOTLAGH, F. KHORMALI, and F. KIANI, “EFFECT OF LAND USE CHANGE ON INORGANIC PHOSPHORUS POOLS IN LOESS DERIVED SOILS OF THE TOSHAN REGION, GOLESTAN PROVINCE,” JOURNAL OF WATER AND SOIL (AGRICULTURAL SCIENCES AND TECHNOLOGY), vol. 29, no. 2, pp. 453–465, 2015, [Online]. Available: https://sid.ir/paper/141073/en

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