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Coarse fragment content influences estimates of soil C and N stocks of alpine grassland on the northeastern edge of Qinghai-Tibetan Plateau,China

引用

Research in Cold and Arid Regions 2022年第2期14卷 100-108页

作者： Yu Qin ShuHua Yi JianJun Chen State Key Laboratory of Cryospheric Sciences Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesNo.320 West Donggang RoadLanzhouGansu 730000China Institute of Fragile Ecosystem and Environment Nantong UniversityNo.999 Tongjing RoadNantongJiangsu 226007China Guangxi Key Laboratory of Spatial Information and Geomatics No.12 Jiangan RoadGuilinGuangxi 541004China

Soil organic carbon(SOC)and total nitrogen(TN)stocks are usually calculated with samples collected using core *** the calculation considers the effects of gravel in soil samples,other coarse fragments such as stones or boulders in soil may not be collected due to the restricted diameter of core *** would cause an incorrect estimation of soil bulk density and ultimately SOC and TN *** this study,we compared the relative volume of coarse fragment and bulk density of fine earth determined by large size soil sampler with three core *** also investigated the uncertainties in estimation of SOC and TN stocks caused by this soil sampler procedure in three typical alpine grasslands on the northeast edge of the Qinghai-Tibetan Plateau(QTP),*** show that(1)the relative volume and size of coarse fragment collected by large size sampler were significantly(psamplers,while bulk density of fine earth,SOC and TN stocks show opposite patterns in all grassland types;(2)SOC and TN stocks determined by core samplers were 17%-45%and 18%-46%higher than larger size sampler for three typical alpine grasslands;and(3)bulk density of fine earth,SOC and TN stocks exponentially decreased with the increasing of coarse fragment *** concluded that core sampler methods significantly underestimated the volume occupied by coarse fragment but overestimated SOC and TN ***,corrections should be made to the results from core samplers using large size samplers on regions with gravel and stone-rich soils in future studies.

关键词： coarse fragment sampler size soil C alpine grassland the Qinghai-Tibetan Plateau

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