ABSTRACT

Soil organic carbon (SOC) is highly sensitive to land use change and helps in maintaining soil quality. Changes in soil fertility status, SOC dynamics, and carbon indices were studied in a four-year experiment with nine sets of food-fodder cropping systems (CS) and three resource conservation techniques like rainfed (RC1), life saving irrigation (RC2) and in-situ moisture conservation practices (RC3). Results showed that the CS5 [Tri-Specific Hybrid (TSH) + Desmanthus virgatus+ (Sorghum + Cowpea – Chickpea)] recorded the highest values 12.25 g kg⁻¹, 41.5 mg kg^−1, 3.5 g kg⁻¹, 289.5 mg kg⁻¹, 424.8 µg g⁻¹ soil, 54.69% and 39.31% of total carbon (TC), hot water-soluble carbon (HWSC), particulate organic carbon (POC), labile carbon (LC), soil microbial biomass carbon (SMBC), humic acid carbon (HA-C) and fulvic acid carbon (FA-C), respectively. Among resources conservation practices, RC3 improved the SOC (56.16%) and other carbon fractions significantly as compared to RC1. Significant and positive correlations (P < 0.05) were found between carbon pools and available nutrients. The carbon management index (CMI) was also maximum (193) with CS5 and CS9 [TSH + Sesbania sesban+ (Sorghum + Cowpea – Barley)] and RC3 (232). Therefore, promoting cultivation of food-fodder system with in-situ moisture conservation practices is considered as sustainable management option for sequester more carbon, sustainability and soil quality in rainfed semi-arid ecosystem.

摘要

土壤有机碳 (SOC) 对土地利用变化高度敏感，有助于保持土壤质量。在一项为期四年的试验中，研究了土壤肥力状况、SOC 动态和碳指数的变化，使用九套饲料种植系统 (CS) 和三种资源保护技术，如雨养 (RC1)、救生灌溉 (RC2) 和原位水分保持实践 (RC3)。结果表明，CS5 [三特异性杂交（TSH）+合欢草属雀鹰+（高粱+豇豆-鹰嘴豆）]记录的最高值12.25克千克^-1，41.5毫克千克^-1， 3.5克千克^-1，289.5毫克公斤^-1 , 424.8 微克^-1土壤、54.69% 和 39.31% 的总碳 (TC)、热水可溶碳 (HWSC)、颗粒有机碳 (POC)、不稳定碳 (LC)、土壤微生物生物量碳 (SMBC)、腐植酸碳 (HA- C) 和富里酸碳 (FA-C)，分别。在资源保护实践中，与RC1相比，RC3显着提高了SOC（56.16%）和其他碳含量。在碳库和有效养分之间发现了显着的正相关（P < 0.05）。CS5 和 CS9 [TSH + Sesbania sesban + (高粱 + 豇豆 – 大麦)] 和 RC3 (232)的碳管理指数 (CMI) 也是最大值 (193 )。因此，促进原位饲草系统的栽培。 在雨养半干旱生态系统中，保持水分的做法被认为是一种可持续的管理选择，可以隔离更多的碳、可持续性和土壤质量。