Abstract
Carbon storage is affected by photosynthesis (Pn) and soil respiration (Rs), which have been studied extensively in natural and agricultural systems. However, the effects of Pn and Rs on carbon storages in the presence of arbuscular mycorrhizal fungi (AMF) in coalfields remain unclear. A field experiment was established in 2014 in Shendong coal mining subsidence area. The treatments comprised two inoculation levels (inoculated with or without 100 g AMF inoculums per seedlings) and four plant species [wild cherry (Prunus discadenia Koebne L.), cerasus humilis (Prunus dictyneura Diels L.), shiny leaf Yellow horn (Xanthoceras sorbifolium Bunge L.) and apricot (Armeniaca sibirica L.)]. AMF increased Pn of four species ranging from 15.3% to 33.1% and carbon storage, averaged by 17.2% compared to controls. Soil organic carbon (OC), easily extractable glomalin-relation soil protein (EE-GRSP), and total glomalin-relation soil protein (T-GRSP) were significantly increased by AMF treatment. The effect of AMF on the sensitivity of Rs depended on soil temperature. The results highlighted the exponential models to explain the responses of Rs to soil temperature, and for the first time quantified AMF caused carbon sequestration and Rs. Thus, to our knowledge, AMF is beneficial to ecosystems through facilitating carbon conservation in coalfield soils.
Highlights
Have been well studied under various temperature and moisture conditions[12]
Pn in all four tree species increased from July to August and strikingly decreased from August to September (Fig. 1)
Rs was significantly decreased from July to September, with slight decrease from July to August and reduced sudden reduction of 21.3–26.9% in September (Fig. 2)
Summary
Have been well studied under various temperature and moisture conditions[12]. A pulse-labeling experiment showed that in temperate prairie, about 4–6% photoassimilates were facilitated via AMF10. AMF enhanced 16% soil CO2 efflux when Lolium pernne roots were colonized and 8% carbon supply was derived from AMF in a barley field[13]. No studies have been carried out on the contribution of AMF on carbon storage in coal mining soil. Lacking a better understanding of these responses in coal mining soil limited to prediction soil carbon storage when AMF existed in current scenarios. The experiment planted wild cherry, cerasus humilis, shiny leaf Yellowh orn and apricot in coal mining soil and half seedlings were inoculated with AMF inoculums. Based on the experimental results, two hypotheses was proposed that: (i) plant species preferentially facilitate their photosynthetic ability and increase Rs rates, leading to different carbon storage amount; and (ii) soil temperature rather than soil moisture is sensitive to Rs due to the extreme drought. The future goal is to investigate the effect of AMF on carbon sequestration in coal mining fields
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