Abstract
It is important to understand the dynamics of soil carbon to study the effects of waste amendment inputs on soil organic carbon decomposition. The aim of this study was to evaluate the effect of waste amendment carbon input on the soil organic carbon (SOC) content, soil particulate organic carbon (POC) content and soil organic carbon mineralization rate dynamics. A 60-day experiment was carried out in the laboratory. The following treatments were compared: (1) CK: soil without amendments; (2) FW1: soil with food waste compost (soil/food waste compost = 100:1); (3) FW2: soil with food waste compost (soil/food waste compost = 100:2); (4) GW1: soil with garden waste compost (soil/garden waste compost = 100:0.84); (5) GW2: soil with garden waste compost (soil/garden waste compost = 100:1.67); (6) FGW1: soil amendments mixture (soil/food waste compost/garden waste compost = 100:0.5:0.42); (7) FGW2: soil amendments mixture (soil/food waste compost/garden waste compost = 100:1:0.84); the inputs of amendment carbon to FW1, GW1 and FGW1 were 2.92 g kg−1, the inputs of amendment carbon to FW2, GW2 and FGW2 were 5.84 g kg−1. The results showed that the addition of waste amendments increased the amount of cumulative mineralization from 95% to 262% and accelerated the rate of soil mineralization. After adding organic materials, the change in the soil organic carbon mineralization rate could be divided into two stages: the fast stage and the slow stage. The dividing point of the two stages was approximately 10 days. When equal amounts of waste amendment carbon were input to the soil, there was no significant difference in SOC between food waste and garden waste. However, SOC increased with the amount of amendment addition. However, for POC, there was no significant difference between the different amounts of carbon input to the garden waste compost treatments. SOC and POC were significantly correlated with the cumulative emissions of CO2.
Highlights
IntroductionIntroduction published maps and institutional affilWith the rapid expansion of cities, food waste and garden waste have become the two main organic wastes that affect the urban ecological environment
Introduction published maps and institutional affilWith the rapid expansion of cities, food waste and garden waste have become the two main organic wastes that affect the urban ecological environment
The main reason is that the input of waste amendments changes the basic C/N of soil and the life activities of microorganisms and produces the binders and carriers that cause the formation of soil aggregates and increase the number of soil aggregates, improving the stability of the agglomerates, which will improve the stability of particulate organic carbon (POC) and be conducive to soil carbon [22,23].This study showed that the soil organic carbon (SOC) of amendment addition treatments gradually increased with increasing amounts of amendment
Summary
Introduction published maps and institutional affilWith the rapid expansion of cities, food waste and garden waste have become the two main organic wastes that affect the urban ecological environment. The production of food waste in China is about 500,000 tons every day. Approximately 5 million tons of garden waste are generated in China each year [1]. Improper handling can cause environmental pollution and disease spread, and there are few resource-based applications of these organic waste, which has become a major obstacle to carbon emission reduction in the new century. If these large amounts of organic waste are disposed of arbitrarily without taking effective measures, it will affect the appearance of the city and cause different degrees of environmental pollution [2,3]. China has issued a series of policies intended to use food waste compost and garden waste for soil quality improvement [4]
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