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Peer review report 2 On “On the spatial variation of soil rhizospheric and heterotrophic respiration in a winter wheat stand”
Agricultural and Forest Meteorology 201S (2015) 424
Contents lists available at ScienceDirect
Agricultural and Forest Meteorology journal homepage: www.elsevier.com/locate/agrformet
Peer Review Report
Peer review report 2 On “On the spatial variation of soil rhizospheric and heterotrophic respiration in a winter wheat stand”
Original Submission Recommendation Major Revision Comments to Author The topic is to separate soil respiration in the winter wheat field to rhizospheric and heterotrophic respiration component with special analysis during growing season of wheat. The design for special variation is well designed, also seasonal pattern could be shown with clop transition -from seedling to harvest. One of most interesting founding in this paper is the spatial pattern is different between rhizospheric and heterotrophic respiration. However, most critical point of this study is the insert collar (50 cm depth) to avoid root ingrowth to measure heterotrophic respiration. The collar is not allow any interaction between inside of collar and outside, resulting in different water contents to normal (7 cm) collars. Moreover it can lead to the special condition for decomposition processes due to luck of oxygen or some nutrients, though value of total soil respiration and CO2 flux from 50 cm collors are similar end of the season. Thus, I am not sure the deeper
0168-1923/$ – see front matter http://dx.doi.org/10.1016/j.agrformet.2015.08.233
collars indicate heterotrophic respiration indeed. (There is no perfect method. For example, the probable method is to use mesh which is enough small size to exclude root and mycelium in but allow water and ion coming and going. But it gives also uncertainly of advection of CO2 from out of collar.). To reduce uncertainlyness, the soil after measurement should be checked in any way. Also please show this power function which is used for adjustment (P6 L130). The water content is lower during early of the season, and higher latter than 7 cm collars. Total soil respiration seems be driven by soil water content. Thus it is important to explain how authors calculate CO2 flux from 50 cm collars and it seems good way or not. Specific comments; P4L79 in material and methods, please show the planting interval of wheat because authors mentions rhizospheric respiration showed clear spatial autocorrelation. Figure2 a) The color difference of heterotrophic and rhizospheric in legend is difficult to see in printing version. Please use another pattern. Anonymous Available online 6 August 2015
Contents lists available at ScienceDirect
Agricultural and Forest Meteorology journal homepage: www.elsevier.com/locate/agrformet
Peer Review Report
Peer review report 2 On “On the spatial variation of soil rhizospheric and heterotrophic respiration in a winter wheat stand”
Original Submission Recommendation Major Revision Comments to Author The topic is to separate soil respiration in the winter wheat field to rhizospheric and heterotrophic respiration component with special analysis during growing season of wheat. The design for special variation is well designed, also seasonal pattern could be shown with clop transition -from seedling to harvest. One of most interesting founding in this paper is the spatial pattern is different between rhizospheric and heterotrophic respiration. However, most critical point of this study is the insert collar (50 cm depth) to avoid root ingrowth to measure heterotrophic respiration. The collar is not allow any interaction between inside of collar and outside, resulting in different water contents to normal (7 cm) collars. Moreover it can lead to the special condition for decomposition processes due to luck of oxygen or some nutrients, though value of total soil respiration and CO2 flux from 50 cm collors are similar end of the season. Thus, I am not sure the deeper
0168-1923/$ – see front matter http://dx.doi.org/10.1016/j.agrformet.2015.08.233
collars indicate heterotrophic respiration indeed. (There is no perfect method. For example, the probable method is to use mesh which is enough small size to exclude root and mycelium in but allow water and ion coming and going. But it gives also uncertainly of advection of CO2 from out of collar.). To reduce uncertainlyness, the soil after measurement should be checked in any way. Also please show this power function which is used for adjustment (P6 L130). The water content is lower during early of the season, and higher latter than 7 cm collars. Total soil respiration seems be driven by soil water content. Thus it is important to explain how authors calculate CO2 flux from 50 cm collars and it seems good way or not. Specific comments; P4L79 in material and methods, please show the planting interval of wheat because authors mentions rhizospheric respiration showed clear spatial autocorrelation. Figure2 a) The color difference of heterotrophic and rhizospheric in legend is difficult to see in printing version. Please use another pattern. Anonymous Available online 6 August 2015