[Response of Soil CO Emissions to Straw-returning in Citrus/Mushroom Intercropping Systems].

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ID: 93188
2019
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Abstract
Based on the pattern of citrus tree/stropharia mushrooms intercropping, returning-straw was used as the raw material for the stropharia mushrooms, and an in-situ experiment was conducted to monitor soil CO emissions under different dosage of straw application during the stropharia growth period. Soil CO emissions and the influencing factors were analyzed under different treatments of cultivated (HSM, ASM, and DSM) and uncultivated stropharia mushrooms (HS, AS, and DS). The mushroom yield and soil carbon emission efficiency (CEE) were used to provide a theoretical basis for improving the use of land under citrus orchards. The results showed that:① Straw return increased the cumulative CO emissions compared with the control system (conventional planting, CK) and cumulative CO emissions increased with the dosage of straw application. Cumulative CO emissions from soil treated with cultivated stropharia mushrooms were higher than those from soil treated with uncultivated stropharia mushrooms, in the order of DSM (52.09 t·hm) > ASM (41.10 t·hm) > HSM (33.20 t·hm) > DS (27.15 t·hm) > AS (25.34 t·hm) > HS (18.94 t·hm) > CK (12.16 t·hm). Cumulative CO emissions under the DSM treatment significantly increased by 328.37% compared with CK. ② For the treatment of cultivated stropharia mushrooms, peak soil CO emissions occurred during the period of mycelium growth. The highest cumulative CO emissions during this period were obtained under the DSM treatment and accounted for 43.27% of the total cumulative emissions. This was followed by ASM and HSM which accounted for 42.63% and 40.57% of emissions, respectively. ③ Cultivated stropharia mushrooms reduced the temperature sensitivity coefficient (). The soil temperature (5 cm depth) had a significant effect on the soil CO emission rate (<0.01) but soil moisture did not (>0.05). Soil temperature explained 27% to 71% of the variation in soil CO emissions rates, and the two-factor fitting of soil temperature and soil moisture explained 36% to 82% of the variation. ④ For the treatment of cultivated stropharia mushrooms, the ranked yield of each treatment was DSM (49.7 t·hm) > ASM (47.0 t·hm) > HSM (23.3 t·hm), and ASM had the highest soil CEE (1.14). Therefore, under the system of citrus tree/stropharia mushroom intercropping, straw return can increase soil CO emissions, with the highest emissions being obtained when a double dosage of straw was applied. However, the optimal amount of straw still needs to be determined in combination with changes in soil nutrients and crop yields.
Reference Key
you2019responsehuan Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors You, Jing;Ni, Jiu-Pai;Huang, Rong;Zhang, Yang;Xie, De-Ti;
Journal huan jing ke xue= huanjing kexue
Year 2019
DOI
10.13227/j.hjkx.201903276
URL
Keywords
Citrus straw returning intercropping soil co2 emissions stropharia mushroom

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