Lime and Nutrient Addition Affects the Dynamics and Fractions of Soil Carbon in a Short-term Incubation Study With 13C-Labeled Wheat Straw

Soil Science ◽  
2019 ◽  
Vol 184 (2) ◽  
pp. 43-51 ◽  
Author(s):  
Elizabeth C. Coonan ◽  
Clive A. Kirkby ◽  
John A. Kirkegaard ◽  
Martin R. Amidy ◽  
Craig L. Strong ◽  
...  
2021 ◽  
Author(s):  
María Martínez-Mena ◽  
Carolina Boix-Fayos ◽  
Efrain Carrillo-López ◽  
Elvira Díaz-Pereira ◽  
Raúl Zornoza ◽  
...  

Abstract Purpose Diversification practices such as intercropping in woody cropping systems have recently been proposed as a promising management strategy for addressing problems related to soil degradation, climate change mitigation and food security. In this study, we assess the impact of several diversification practices in different management regimes on the main carbon fluxes regulating the soil carbon balance under semiarid Mediterranean conditions. Methods The study was conducted in two nearby cropping systems: (i) a low input rainfed almond (Prunus dulcis Mill.) orchard cultivated on terraces and (ii) a levelled intensively irrigated mandarin (Citrus reticulata Blanco) orchard with a street-ridge morphology. The almond trees were intercropped with Capparis spinosa or with Thymus hyemalis While the mandarin trees were intercropped with a mixture of barley and vetch followed by fava bean. Changes caused by crop diversifications on C inputs into the soil and C outputs from the soil were estimated. Results Crop diversification did not affect soil organic carbon stocks but did affect the carbon inputs and outputs regulating the soil carbon balance of above Mediterranean agroecosystems. Crop diversification with perennials in the low-input rainfed woody crop system significantly improved the annual soil C balance in the short-term. However, crop diversification with annual species in the intensively managed woody crop system had not effect on the annual soil C balance. Conclusions Our results highlight the potential of intercropping with perennials in rainfed woody crop systems for climate change mitigation through soil carbon sequestration.


2019 ◽  
Author(s):  
Hongying Yu ◽  
Zhenzhu Xu ◽  
Guangsheng Zhou ◽  
Yao Shou

Abstract. Climate change severely impacts grassland carbon cycling, especially in arid ecosystems, such as desert steppes. However, little is known about the responses of soil respiration (Rs) to different warming magnitudes and watering pulses in situ in desert steppes. To examine their effects on Rs, we conducted long-term moderate warming, short-term acute warming and watering field experiments in a desert grassland of Northern China. While experimental warming significantly reduced Rs by 32.5 % and 40.8 % under long-term and moderate and short-term and acute warming regimes, respectively, watering pulses stimulated it substantially. Warming did not change the exponential relationship between Rs and soil temperature, whereas the relationship of Rs with soil water content (SWC) was well fitted to the Gompertz function. The soil features were not significantly affected by either long-term or short-term warming regimes, respectively; however, soil organic carbon content tended to decrease with long-term climatic warming. This indicates that soil carbon release responses strongly depend on the duration and magnitude of climatic warming, which may be driven by SWC and soil temperature. The results of this study highlight the great dependence of soil carbon emission on warming regimes of different durations and the important role of precipitation pulse during growing season in assessing the terrestrial ecosystem carbon balance and cycle.


2008 ◽  
Vol 56 (23) ◽  
pp. 11399-11406 ◽  
Author(s):  
Y. Machrafi ◽  
F.-P. Chalifour ◽  
J. Wamegni ◽  
C. J. Beauchamp

2021 ◽  
Author(s):  
Mbezele Junior Yannick NGABA ◽  
Yves Uwiragiye ◽  
Roland Bol ◽  
Wim de Vries ◽  
Jianbin Zhou

Geoderma ◽  
2022 ◽  
Vol 406 ◽  
pp. 115487
Author(s):  
Julius Koritschoner ◽  
Franca Giannini Kurina ◽  
Susana Hang ◽  
Mónica Balzarini

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