Soil type and temperature determine soil respiration seasonal dynamics in dairy grassland  

作　　者：Yulin Liu Jingjing Zhang Martin Karl-Friedrich Bader Sebastian Leuzinger 

机构地区：[1]School of Science,Auckland University of Technology,34 St.Paul Street,Auckland 1010,New Zealand [2]The New Zealand Institute for Plant and Food Research Limited,120 Mt Albert Road,Mt Albert,Auckland 1025,New Zealand [3]Department of Forestry and Wood Technology,Linnaeus University,P G Vejdes väg,35195 Växjö,Sweden

出　　处：《Soil Ecology Letters》2024年第4期283-294,共12页土壤生态学快报(英文)

摘　　要：Soil respiration rates(R_(s))were measured in New Zealand dairy grassland.Both season and soil type significantly affected R_(s).Soil temperature and soil type dominated overall R_(s).Soil respiration(R_(s)),the CO_(2) release from root respiration and microbial metabolism,affects global soil carbon storage and cycling.Only few studies have looked at R_(s) in the southern hemisphere,especially regarding the interaction between soil type and environmental factors on R_(s) in dairy grassland.We investigated the relationship between R_(s) and soil temperature(Ts),soil water content(SWC),soil type,and other environmental factors based on summer and winter measurements at four sites in New Zealand.Across sites,soil respiration rates ranged from 0.29 to 14.58 with a mean of 5.38±0.13(mean±standard error)μmol CO_(2) m^(−2) s^(−1).Mean summer R_(s) was 86.5%higher than mean winter R_(s),largely driven by organic/gley and pumice soils while ultic soils showed very little seasonal temperature sensitivity.Overall mean R_(s) in organic/gley soils was 108.0%higher than that in ultic soils.The high R_(s) rate observed in organic/gley was likely due to high soil organic matter content,while low R_(s) in ultic and pallic soils resulted from high clay content and low hydraulic conductance.Soil temperature drove overall R_(s).Our findings indicate that soil type and soil temperature together best explain R_(s).This implies that a mere classification of land use type may be insufficient for global C models and should be supplemented with soil type information,at least locally.

关 键 词：AGRICULTURE agricultural soils land use livestock farming soil carbon emission soil temperature 

分 类 号：S812.2[农业科学—草业科学]