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Soil nutrient status under pine and oak forests in temperate valley slopes of garhwal himalaya, india

Author: 
Tahir Nazir and Nusrat Samweel
Subject Area: 
Social Sciences and Humanities
Abstract: 

The present study was undertaken in the undisturbed and disturbed pine and oak forests of Pauri area in the Garhwal region of Uttarakhand, India. The aim of the present study was to assess the physic-chemical properties of these soils. Chemical properties of the soil, i.e., total nitrogen (N), available phosphorus (P), available potassium (K), organic carbon (C), soil organic matter (SOM), pH, C:N ratios, exchangeable Calcium (Ca) and Magnesium (Mg) and micronutrients Iron (Fe), copper (Cu), Zinc (Zn) and Manganese (Mn) were analyzed for different depths viz., 0-10, 10-30, 30-60, 60- 90, 90-120, 120-150cm in both the undisturbed and disturbed forest types. The phosphorus was found higher in the lower horizons of the Quercus leucotrichophora forest, which may be due to the leaching properties of the soils. The available nitrogen was also higher in the undisturbed forests than in the disturbed forests. The soil pH was found higher at both the disturbed sites. Among the two forest covers, the soils under Quercus leucotrichophora showed comparatively higher CEC than the soils under Pine. The higher values of CEC in the soils may be due to availability of higher organic matter and clay content. The content of exchangeable Ca2+ was maximum under Quercus leucotrichophora and minimum under Pinus roxburghii forest types. Among micronutrients, the manganese was found higher under Pinus roxburghii forest cover. Pine needles being rich in Mn content might have accounted for high level of Mn. Zn was found higher under oak forest cover. In case of Pinus roxburghii forest, a significant positive correlation was found between total nitrogen and organic carbon (0.97), available nitrogen and organic carbon (0.94), CEC and organic carbon (0.98) (Table 5). In case of Quercus leucotrichophora forest, a significant positive correlation was found between total nitrogen and available nitrogen (0.93), available phosphorus and total nitrogen (0.98) (Table 6).

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