Abstract

A study was conducted in lower Shiwaliks of Punjab, India to study the soil organic carbon (SOC) stock variation in hill, piedmont plain and alluvial plain regions of Punjab, and further to investigate the SOC variability down the slope in the lower Shiwaliks region of Punjab. The SOC fractions viz. very labile carbon, labile carbon, less labile carbon and recalcitrant were determined using standard methodologies. The total SOC stock in 0–60 cm soil depth was highest in plain region (31.81 Mg ha⁻¹), followed by piedmont (23.43 Mg ha⁻¹) and lowest in hill region (22.86 Mg ha⁻¹). Whereas, the SOC concentration in surface layer was highest in foot slope (5.76 g kg⁻¹) followed by mid slope (4.14 g kg⁻¹) and lowest in up slope (2.32 g kg⁻¹). Among the SOC fractions the average labile carbon content in soil samples was found in the order, hills (0.81 g kg⁻¹) > piedmonts (0.73 g kg⁻¹) > plains (0.50 g kg⁻¹). The soil bulk density (D_b) was higher in the plain than that of piedmont and hills. Moreover, a similar trend is observed in case of water holding capacity. Regression analysis has revealed significant relationship between D_b and SOC stock at p < 0.05. Further, analysis of variance (ANOVA) at p < 0.05 has indicated significant differences among concentration of SOC and stock influenced by land use and soil depths. Thus, an understanding of the effect of physiography on SOC via such studies is important for soil quality management.

摘要

在印度旁遮普省下 Shiwaliks 地区进行了一项研究，以研究旁遮普省丘陵、山前平原和冲积平原地区的土壤有机碳 (SOC) 库变化，并进一步调查下 Shiwaliks 地区坡度下的 SOC 变异性。旁遮普。SOC 分数即。使用标准方法测定非常不稳定的碳、不稳定的碳、不太不稳定的碳和顽固的碳。0-60 cm 土壤深度的总 SOC 储量在平原地区最高（31.81 Mg ha ^-1），其次是山麓（23.43 Mg ha ^-1），丘陵地区最低（22.86 Mg ha ^-1）。而表层的 SOC 浓度在坡脚（5.76 g kg ^-1）最高，其次是中坡（4.14 g kg ^-1) 和最低的上坡 (2.32 g kg ^-1 )。在 SOC 部分中，土壤样品中的平均不稳定碳含量的顺序为：丘陵 (0.81 g kg ^-1 ) > 山麓 (0.73 g kg ^-1 ) > 平原 (0.50 g kg ^-1 )。平原土壤容重（D _b）高于山麓和丘陵。此外，在持水能力的情况下观察到类似的趋势。回归分析显示 D _b与 SOC 储量之间存在显着关系，p  < 0.05。此外，p处的方差分析 (ANOVA) < 0.05 表明受土地利用和土壤深度影响的 SOC 和种群浓度之间存在显着差异。因此，通过此类研究了解地理学对 SOC 的影响对于土壤质量管理非常重要。